Search

Your search keyword '"F. Scheurer"' showing total 114 results
Start Over Author "F. Scheurer"
114 results on '"F. Scheurer"'

1. Magnetism and Accelerator-Based Light Sources

Author

Jean-Michel Mariot, F. Scheurer, Loïc Joly, and Hervé Bulou

Subjects
Physics, X-ray spectroscopy, Semiconductor, Spintronics, business.industry, Magnetism, Optical physics, Synchrotron radiation, Magnetic semiconductor, business, Engineering physics, International school
Published
2021

2. Electron-Spin Motion as a New Tool to Investigate Ferromagnetic Film Systems: A Few Examples

Author

Hervé Bulou, Ali Hallal, Juergen Henk, Puja Dey, Laurent Joly, F. Djeghloul, F. Scheurer, Wolfgang Weber, E. Urbain, A. Bourzami, D. Spor, Mebarek Alouani, T. Berdot, and L. Tati Bismaths

Subjects
Nuclear magnetic resonance, Materials science, Condensed matter physics, Ferromagnetism, Motion (geometry), Electrical and Electronic Engineering, Atomic and Molecular Physics, and Optics
Published
2013

3. Magneto-optical interactions in single-molecule magnets: Low-temperature photon-induced demagnetization

Author

Jean-Paul Kappler, Emilie Voirin, Bertrand Donnio, Emmanuel Terazzi, F. Scheurer, Guillaume Rogez, Dominique Luneau, Christophe Aronica, Guillaume Chastanet, Eric Rivière, Loïc Joly, Jean-Louis Gallani, Institut de Physique et Chimie des Matériaux de Strasbourg (IPCMS), Université Louis Pasteur - Strasbourg I-Centre National de la Recherche Scientifique (CNRS), Institut de Chimie Moléculaire et des Matériaux d'Orsay (ICMMO), Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC), Department of Inorganic, Analytical and Applied Chemistry - University of Geneva, Laboratoire des Multimatériaux et Interfaces (LMI), Université Claude Bernard Lyon 1 (UCBL), and Université de Lyon-Université de Lyon-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Photon, Spin transition, 02 engineering and technology, [CHIM.INOR]Chemical Sciences/Inorganic chemistry, 010402 general chemistry, 01 natural sciences, [CHIM]Chemical Sciences, General Materials Science, Single-molecule magnet, Physics, Magnetic moment, Condensed matter physics, XMCD, Demagnetizing field, Superradiance, [CHIM.MATE]Chemical Sciences/Material chemistry, General Chemistry, 021001 nanoscience & nanotechnology, Condensed Matter Physics, Ray, 0104 chemical sciences, Magnet, Phonons, 0210 nano-technology, Photomagnetism, Microwave
Abstract

International audience; We show that the irradiation of SMM molecules at optical wavelengths can drive an increase or a decrease of the magnetic moment of a SMM, even though the energy of the photons does not correspond to a precise electronic or spin transition, the light pulse triggering a phonon-assisted spin transition. The process is sensitive to the power of the incident light. This result most probably explains why it has been so far impossible to observe the opening of the hysteresis loop on thin films of SMM with the XMCD technique. The consequences of these observations are manifold: they bring a means of controlling molecular magnets, open prospects in the field of quantum computing, and may enable the realization of coherent microwave sources through stimulated superradiance.

Published
2010

4. Morphology- and Quantum-Size Induced Oscillations of the Electron-Spin Precession in Fe Films on Ag(001)

Author

F. Scheurer, L.T. Bismaths, L. Joly, and Wolfgang Weber

Subjects
Physics, Magnetization, Condensed matter physics, Ferromagnetism, Monolayer, Electron, Electrical and Electronic Engineering, Spin (physics), Polarization (waves), Electron spectroscopy, Light scattering, Electronic, Optical and Magnetic Materials
Abstract

We report on spin-polarized electron reflection experiments on Fe films on Ag(001). Upon reflecting from the Fe film the electron-spin polarization vector is found to vary in an oscillatory fashion as a function of the Fe thickness. Two different periods are identified. While the long period is related to the occurrence of quantum interference in the Fe layer, the short period of one monolayer is attributed to the periodic variations of the film morphology alternating between filled and incompletely filled atomic layers.

Published
2008

5. Magnetism, structure and morphology of thin cobalt films deposited on Cu(115)

Author

D. Chandesris, Hélène Magnan, Hervé Bulou, Patrick Le Fèvre, Luc Barbier, F. Scheurer, and Anne Chaumin Midoir

Subjects
Condensed matter physics, Magnetism, Relaxation (NMR), chemistry.chemical_element, Surfaces and Interfaces, Condensed Matter Physics, Surfaces, Coatings and Films, law.invention, Condensed Matter::Materials Science, Magnetization, Magnetic anisotropy, Crystallography, chemistry, law, Materials Chemistry, Scanning tunneling microscope, Anisotropy, Cobalt, Vicinal
Abstract

The growth of a cobalt film on a vicinal Cu(1 1 n) surface induces an uniaxial magnetic anisotropy. If the steps are clearly at the origin of this behaviour, the exact mechanism (lower coordination at steps, anisotropic strain) remains obscure. For Co films grown on Cu(1 1 5), a twofold magnetic anisotropy is observed by in situ Kerr effect for thicknesses above 5 monolayers (ML), the easy magnetization axis being always parallel to the step edge. Detailed studies of the morphology by scanning tunneling microscopy and of the structure by Surface EXAFS allow to conclude that the step-induced magnetic anisotropy does not originate from an in-plane anisotropic structural relaxation but is more likely related to the stepped film morphology.

Published
2003

6. Surface extended x-ray absorption fine structure studies of metastable magnetic thin films and nanostructures

Author

Henri Jaffrès, D. Chandesris, Luc Barbier, A Chaumin-Midoir, P. Le Fèvre, Hélène Magnan, and F. Scheurer

Subjects
Materials science, Extended X-ray absorption fine structure, Condensed matter physics, Relaxation (NMR), Condensed Matter Physics, Condensed Matter::Materials Science, Magnetization, Magnetic anisotropy, Condensed Matter::Superconductivity, Surface-extended X-ray absorption fine structure, General Materials Science, Thin film, Anisotropy, Vicinal
Abstract

Magnetic films deposited on single-crystal substrates have been the subject of numerous studies since their bi-dimensional or nanostructured character provides important extensions of the family of bulk magnetic solids. For these objects, the knowledge of their size, shape and structure at the atomic scale are mandatory for an understanding of their unusual magnetic properties. After a short introduction to the strengths of extended x-ray absorption fine structure (EXAFS) for local structure determination, we will concentrate on three well defined cases. Thin Ni layers deposited on Cu(001) present a perpendicular magnetic anisotropy in a very wide thickness range, and thin Fe layers on MgO(001) cut into stripes by the 'atomic saw' (AS) method have a magnetization easy axis oriented perpendicular to the stripes. In both cases, a precise structural characterization obtained by EXAFS and simple magneto-elastic models allow description of their magnetic behaviour. The growth of a cobalt film on a vicinal Cu(11n) surface induces a uniaxial magnetic anisotropy. Although the steps are clearly at the origin of this behaviour, the exact mechanism (lower coordination at step edges, anisotropic strain) remains obscure. Detailed studies of the morphology by STM and of the structure by EXAFS allow the conclusion that the step-induced magnetic anisotropy does not originate from an in-plane anisotropic structural relaxation but is more likely related to the stepped film morphology.

Published
2003

7. Self-organized growth of nanosized flat dots and vertical magnetic Co pillars on Au(111)

Author

Gilles Renaud, M. Klaua, Jeannot Mane-Mane, J.P. Deville, Jürgen Kirschner, J. Barthel, M. Noblet, O. Ulrich, Olivier Fruchart, F. Scheurer, and Antoine Barbier

Subjects
Coalescence (physics), Materials science, business.industry, Scattering, Nanotechnology, Heterojunction, Condensed Matter Physics, law.invention, Inorganic Chemistry, Quantum dot, law, Materials Chemistry, Optoelectronics, Grazing-incidence small-angle scattering, Scanning tunneling microscope, business, Spectroscopy, Molecular beam epitaxy
Abstract

We report various experiments that cast some light on the growth process of self-organized dots and vertical Co pillars on Au(1 1 1). We first report grazing incidence small angle X-ray scattering (GISAXS) on Co dots and films, that allowed us to perform a crystallographic study of the order in the self-organized array, and also yielded a statistical view of the coalescence process. We then report scanning tunneling microscopy (STM) and spectroscopy (STS) images performed during the course of vertical growth. Details about the atomic growth process and the possible influence of the growth technique used are reported.

Published
2002

8. DEIMOS: A beamline dedicated to dichroism measurements in the 350–2500 eV energy range

Author

Jean-Paul Kappler, Ph. Sainctavit, F. Deschamps, J.-P. Daguerre, François Polack, Thierry Moreno, Bruno Lagarde, Edwige Otero, K. Chen, Philippe Ohresser, Fadi Choueikani, Loïc Joly, B. Muller, Oana Bunau, Stefan Stanescu, F. Marteau, F. Scheurer, Synchrotron SOLEIL (SSOLEIL), Centre National de la Recherche Scientifique (CNRS), Institut de Physique et Chimie des Matériaux de Strasbourg (IPCMS), Université Louis Pasteur - Strasbourg I-Centre National de la Recherche Scientifique (CNRS), Institut de minéralogie, de physique des matériaux et de cosmochimie (IMPMC), Institut de recherche pour le développement [IRD] : UR206-Centre National de la Recherche Scientifique (CNRS)-Muséum national d'Histoire naturelle (MNHN)-Université Pierre et Marie Curie - Paris 6 (UPMC), Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut de recherche pour le développement [IRD] : UR206-Muséum national d'Histoire naturelle (MNHN)-Centre National de la Recherche Scientifique (CNRS), and Muséum national d'Histoire naturelle (MNHN)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut de recherche pour le développement [IRD] : UR206-Centre National de la Recherche Scientifique (CNRS)

Subjects
Physics, [PHYS]Physics [physics], Photon, Magnetic circular dichroism, business.industry, Astrophysics::High Energy Astrophysical Phenomena, Aucun, Dichroism, Photon energy, Linear dichroism, 7. Clean energy, Synchrotron, law.invention, Optics, Nuclear magnetic resonance, Beamline, law, Physics::Accelerator Physics, Spectroscopy, business, Instrumentation
Abstract

The DEIMOS (Dichroism Experimental Installation for Magneto-Optical Spectroscopy) beamline was part of the second phase of the beamline development at French Synchrotron SOLEIL (Source Optimisee de Lumiere a Energie Intermediaire du LURE) and opened to users in March 2011. It delivers polarized soft x-rays to perform x-ray absorption spectroscopy, x-ray magnetic circular dichroism, and x-ray linear dichroism in the energy range 350-2500 eV. The beamline has been optimized for stability and reproducibility in terms of photon flux and photon energy. The main end-station consists in a cryo-magnet with 2 split coils providing a 7 T magnetic field along the beam or 2 T perpendicular to the beam with a controllable temperature on the sample from 370 K down to 1.5 K. (C) 2014 AIP Publishing LLC.

Published
2014

9. Near-field and far-field optical properties of thin metallic films

Author

Eric Beaurepaire, N. Richard, T. David, Alain Dereux, Eric Bourillot, B. Dumay, F. Scheurer, and Yvon Lacroute

Subjects
Total internal reflection, Photon, Materials science, business.industry, Physics::Optics, General Physics and Astronomy, Near and far field, law.invention, Optics, law, Angle of incidence (optics), Electric field, Attenuated total reflection, Scanning tunneling microscope, business, Refractive index
Abstract

Reflectivity measurements in an attenuated total internal reflection (ATIR) geometry and the variation of the transmitted intensity associated to the total electric field in a frustrated ATIR configuration using a photon scanning tunneling microscope (PSTM) of multilayered metallic films are presented as a function of the angle of incidence. Eigenmodes for total reflection and absorption associated with the optical properties of magnetic and nonmagnetic materials are theoretically and experimentally determined from the reflected and the transmitted spectra. Good agreement between theory and experiment demonstrates that PSTM is a powerful technique to characterize accurately and locally drastic variations of the intensity around optical modes of a multilayer system.

Published
2001

10. Magnetism of CoPd self-organized alloy clusters on Au(111)

Author

Andrei Rogalev, Christine Goyhenex, Philippe Ohresser, Jacek Arabski, Michelangelo Romeo, Edwige Otero, Hervé Bulou, Virginie Speisser, F. Scheurer, Fabrice Wilhelm, Laurent Joly, and Guillaume Schull

Subjects
Materials science, Magnetic moment, Condensed matter physics, Magnetism, Magnetic circular dichroism, Alloy, Aucun, General Physics and Astronomy, engineering.material, equipment and supplies, Magnetic anisotropy, Magnetic shape-memory alloy, engineering, Anisotropy, human activities, Superparamagnetism
Abstract

Magnetic properties of gold-encapsulated CoxPd1-x self-organized nano-clusters on Au(111) are analyzed by x-ray magnetic circular dichroism for x = 0.5, 0.7, and 1.0. The clusters are superparamagnetic with a blocking temperature decreasing with increasing Pd concentration, due to a reduction of the out-of-plane anisotropy strength. No magnetic moment is detected on Pd in these clusters, within the detection limit, contrary to thick CoPd films. Both reduction of anisotropy and vanishing Pd moment are attributed to strain. (C) 2013 AIP Publishing LLC.

Published
2013

11. Controlled nucleation of Co clusters on Au(111): towards spin engineering

Author

I. Chado, Jean-Pierre Bucher, F. Scheurer, and S. Padovani

Subjects
Nanostructure, Materials science, Nucleation, General Physics and Astronomy, Spin engineering, Surfaces and Interfaces, General Chemistry, Substrate (electronics), Condensed Matter Physics, Surfaces, Coatings and Films, law.invention, Magnetization, Crystallography, Adsorption, Chemical physics, law, Scanning tunneling microscope, Surface reconstruction
Abstract

The morphology and distribution of Co clusters on Au(111) can be controlled: from very small (a few atoms) randomly distributed clusters to bigger (several 100 atoms) self-organized clusters on a regular network. The substrate temperature imposed during growth turns out to be the leading parameter, deciding for spontaneous organization of adsorbed metal atoms. From a detailed variable temperature scanning tunneling microscopy (STM) study, it is suggested that this way of organizing matter at the nanoscale may be used to achieve new material properties. In particular, from in situ magnetic measurements on the example of Co on Au(111), it is shown that the direction of the magnetization can be adjusted from in-plane to out-of-plane, depending on the growth condition.

Published
2000

12. Near-field zone analysis of the Faraday rotation of magneto-optical thin films

Author

Alain Dereux, F. Scheurer, T. David, Eric Beaurepaire, J. P. Goudonnet, N. Richard, and Eric Bourillot

Subjects
Total internal reflection, Materials science, business.industry, General Physics and Astronomy, Faraday cup, Near and far field, Magneto-optic effect, law.invention, symbols.namesake, Optics, law, Electric field, Faraday effect, symbols, Faraday rotator, business, Plasmon
Abstract

This article studies, in the near-field zone, the magneto-optical Faraday effect of metallic multilayers illuminated under the condition of total internal reflection. We present numerical results obtained by the Green’s dyadic technique which depicts the distribution associated with each Cartesian component of the electric field inside, as well as outside, the magneto-optical structure. The Faraday rotation is found to increase significantly around the resonances associated either with plasmons or to interferences inside thin films.

Published
2000

14. Optimized factor of merit of the magneto-optical Kerr effect of ferromagnetic thin films

Author

P. Beauvillain, N. Richard, J. P. Goudonnet, Eric Beaurepaire, F. Scheurer, and Alain Dereux

Subjects
Physics, Kerr effect, business.industry, Physics::Optics, Context (language use), Optical storage, Condensed Matter Physics, Electronic, Optical and Magnetic Materials, Optics, Magneto-optic Kerr effect, Ferromagnetism, Magnet, Optoelectronics, Figure of merit, Thin film, business
Abstract

This paper deals with the optimization of the factor of merit of the magneto-optical Kerr effect of a resonant multilayer cavity including a ferromagnetic film. This optimization is of interest in the context of optical storage technology. Using numerical simulations based on the Green's dyadic technique, we discuss a route to obtain magneto-optical multilayers with a vanishing ellipticity and factors of merit (with respect to the bulk magnetic material) larger than 3 on a broad range of wavelengths, significantly higher than the actual state of the art.

Published
2000

15. Anomalous magnetic anisotropy of ultrathin Co films grown at 30 K on Au(111)

Author

F. Scheurer, S. Padovani, Jean-Pierre Bucher, and I. Chado

Subjects
Materials science, Condensed matter physics, Annealing (metallurgy), chemistry.chemical_element, Atmospheric temperature range, Condensed Matter::Materials Science, Magnetic anisotropy, Nuclear magnetic resonance, chemistry, Ferromagnetism, Transition metal, Thin film, Anisotropy, Cobalt
Abstract

Atomically thick cobalt layers are grown on Au(111) by ultrahigh vacuum low-temperature deposition. Low-temperature deposition precludes the formation of three-dimensional cobalt bilayers clusters that grow in arrays at room temperature. As a result, ferromagnetic Co films with an anomalous in-plane magnetic anisotropy are obtained for thicknesses above 1.6 ML. Annealing produces an irreversible reorientation of the anisotropy from in plane to out of plane. However, a preferential in-plane anisotropy can be stabilized by covering the Co with a gold film.

Published
2000

16. Application to dielectric, metallic, and magnetic samples of a transmission mode scanning near field optical microscope with normal force distance regulation on bent optical fibers

Author

J. P. Goudonnet, F. Scheurer, Joachim R. Krenn, N. Richard, Michel Hehn, T. David, K. Ounadjela, Yvon Lacroute, and C. Chicanne

Subjects
Scanning Hall probe microscope, Optical fiber, Microscope, Materials science, business.industry, Near-field optics, Physics::Optics, Dielectric, law.invention, Optics, Optical microscope, law, Near-field scanning optical microscope, Magnetic force microscope, business, Instrumentation
Abstract

We have developed a scanning near field optical microscope (SNOM) based on bent optical fiber probes with a normal force atomic force microscopies (AFM) regulation. The optical fibers are used both as optical probes and AFM cantilevers. This SNOM was especially developed for transmission mode SNOM and it offers the possibility to realize simultaneously all AFM modes imaging and optical analysis. The fiber is used to illuminate the sample and the detection is performed through an inverted optical microscope. This article presents results obtained on dielectric, metallic, and magnetic samples with submicronic features. We have resolved the object of 80 nm in size, separated by 40 nm, and we illustrate the capabilities of our SNOM in investigating, locally, the variation of the optical properties of periodic samples, even though contaminant, and for a large variety of samples.

Published
1999

17. Kerr and Faraday Rotations of Magneto-Optical Multilayers under the Condition of Total Internal Reflection

Author

Eric Bourillot, J. P. Goudonnet, T. David, F. Scheurer, Alain Dereux, E. Beaurepaire, and N. Richard

Subjects
Physics, Total internal reflection, business.industry, Condensed Matter Physics, Magneto-optic effect, Electronic, Optical and Magnetic Materials, Magneto optical, law.invention, symbols.namesake, Optics, Magneto-optic Kerr effect, law, Faraday effect, symbols, Faraday rotator, business, Faraday cage
Published
1999

18. Strain induced epitaxial relationships of Cr on Co/Pd(111)

Author

R. Baudoing-Savois, M. De Santis, Eric Beaurepaire, B. Carrière, S. Boukari, F. Scheurer, Hervé Bulou, and J.P. Deville

Subjects
Diffraction, Materials science, Low-energy electron diffraction, chemistry.chemical_element, Surfaces and Interfaces, Condensed Matter Physics, Epitaxy, Surfaces, Coatings and Films, Chromium, Crystallography, Lattice constant, chemistry, Transition metal, X-ray crystallography, Materials Chemistry, Cobalt
Abstract

The growth and structure of Co ultra-thin films on Pd(111) and Cr on Co/Pd(111) have been analyzed by grazing incidence X-ray diffraction and low energy electron diffraction. It is shown that the in-plane lattice constant of the epitaxial Co film depends on the growth temperature. Although the strain decreases as a function of the Co film thickness, it persists for 20 monolayer (ML) films or even thicker. When Cr is deposited at room temperature on a strained Co film (10 to 20 ML thick) a Kurdjumov–Sachs epitaxial relationship is observed, whereas when Cr is deposited on a Co(0001) single-crystal or on a very thick Co film on Pd(111), a Nishyama–Wassermann orientation is obtained.

Published
1999

19. Transition from zero-dimensional superparamagnetism to two-dimensional ferromagnetism of Co clusters on Au(111)

Author

Jean-Pierre Bucher, S. Padovani, I. Chado, and F. Scheurer

Subjects
Physics, Condensed matter physics, Heisenberg model, chemistry.chemical_element, law.invention, Condensed Matter::Materials Science, chemistry, Zigzag, Ferromagnetism, law, Cluster (physics), Condensed Matter::Strongly Correlated Electrons, Ising model, Scanning tunneling microscope, Cobalt, Superparamagnetism
Abstract

The early growth stages of Co structures on Au(111) have been analyzed by scanning tunneling microscopy and their magnetic properties simultaneously measured, in situ, by Kerr effect and, ex situ by superconducting quantum interference device. With increasing cobalt coverage, cobalt clusters, organized on the lattice of the $22\ifmmode\times\else\texttimes\fi{}\sqrt{3}$ zigzag reconstruction coalesce into one-dimensional (1D) chains at a coverage of 1.0 monolayer (ML) and then into a nearly continuous film at 2 ML. While this well-defined growth mode is dictated by the presence of ordered point dislocations at the zigzag reconstruction of the relaxed gold surface, anomalous nucleation and growth is also observed when large domains of strained linear reconstructions are present. Two families of clusters must then be considered with important consequences for magnetic properties. When only the zigzag reconstruction is present, the onset of long-range, 2D ferromagnetism is observed at a coverage of 1.6 ML of cobalt. A Monte Carlo simulation of an anisotropic Heisenberg model describes well transitions from 0D cluster superparamagnetism, to 1D Ising behavior and finally to 2D ferromagnetism as a function of cobalt coverage, in good agreement with experimental results.

Published
1999

20. Four pole electromagnet for in situ magneto-optical measurements

Author

E. Beaurepaire, B. Carrière, B. Muller, J. Balay, G. Biechel, S. Boukari, J.P. Deville, and F. Scheurer

Subjects
Physics, Electromagnet, Magnetometer, business.industry, Physics::Optics, Condensed Matter Physics, Rotation, Ray, Surfaces, Coatings and Films, law.invention, Magnetization, Optical path, Optics, Magneto-optic Kerr effect, law, Vacuum chamber, business, Instrumentation
Abstract

A Kerr magnetometer using a four pole electromagnet is described which allows the measurement of the Kerr rotation and ellipticity of a magnetic sample in both polar and longitudinal geometries without changing the optical path or the sample position. A maximum field of 4 kOe can be applied in any direction of the plane of the incident light. A continuous recording of the magnetization curves is possible during the growth of ultrathin metallic layers on a substrate in an ultra high vacuum system.

Published
1999

21. Magneto-optical effects in multilayers illuminated by total internal reflection

Author

F. Scheurer, J. P. Goudonnet, G. Garreau, N. Richard, Eric Beaurepaire, Alain Dereux, T. David, and Eric Bourillot

Subjects
Wavelength, Total internal reflection, Materials science, Optics, Angle of incidence (optics), business.industry, Physics::Optics, Substrate (electronics), business, Anisotropy, Rotation, Plasmon, Spectral line
Abstract

This paper describes the magneto-optical effects of metallic multilayers under the condition of total internal reflection. In the framework of Green’s dyadic technique, we detail a practical and at time-consuming scheme to compute accurately the optical properties of anisotropic multilayers deposited on a substrate. We present numerical simulations which account for the variation of the angle of incidence at a fixed wavelength and for the variation of the wavelength at fixed angle of incidence. The Kerr rotation is found to increase significantly around the critical angle for total reflection. We also discuss the importance of plasmon effects in the structure of the Kerr rotation spectra. @S0163-1829~99!00708-0#

Published
1999

22. Burrowing self-organized cobalt clusters into a gold substrate

Author

F. Scheurer, S. Padovani, and Jean-Pierre Bucher

Subjects
inorganic chemicals, In situ, Mass transport, Auger electron spectroscopy, Materials science, General Physics and Astronomy, chemistry.chemical_element, Nanotechnology, chemistry, Chemical physics, Thermal, Cluster (physics), Cobalt, Dissolution
Abstract

The mechanism of cobalt-cluster incorporation into a Au(111) substrate is followed by variable temperature STM, Auger spectroscopy, and in situ magneto-optic Kerr (MOKE) measurements. Upon thermal activation, cobalt clusters sink into the substrate by simultaneously expelling gold atoms which, in turn, contribute by embedding the remaining cobalt clusters. Although important mass transport occurs during this operation, MOKE indicates that the clusters remain globally undisturbed, until finally, irreversible cluster fragmentation and dissolution occur above 600 K.

Published
1999

24. Characterization of the interface by core-level photoemission electron spectroscopy

Author

F. Scheurer, Nicholas Barrett, N. Marsot, M.A. Delaunay, Rachid Belkhou, C. Guillot, and B. Bartenlian

Subjects
Chemistry, Inverse photoemission spectroscopy, Analytical chemistry, Angle-resolved photoemission spectroscopy, Crystal growth, Surfaces and Interfaces, Substrate (electronics), Island growth, Condensed Matter Physics, Electron spectroscopy, Surfaces, Coatings and Films, Overlayer, X-ray photoelectron spectroscopy, Materials Chemistry
Abstract

The growth of Co layers deposited at room temperature on a Au(111) single-crystal has been studied by means of synchrotron radiation induced angle resolved photoemission spectroscopy (PES). The surface and bulk components of the Au 4 f 7 2 photoemission line were analyzed as a function of Co coverage. From the evolution of the positions and intensities of the different contributions of the Au 4 f 7 2 line one can deduce an island growth below two monolayers (ML) coverage. Above 2 ML, the completion of the interstices between islands starts and the surface is completely covered slightly above 3 ML. A third component appears above 2.2 ML in the photoemission line and is attributed to interdiffusion between the Co overlayer and the Au substrate.

Published
1997

25. First glimpse of the soft x-ray induced excited spin-state trapping effect dynamics on spin cross-over molecules

Author

Philippe Ohresser, V. Davesne, V. Da Costa, Manuel Gruber, Martin Bowen, Ana B. Gaspar, S. Boukari, Toshio Miyamachi, Wulf Wulfhekel, Fadi Choueikani, Laurent Joly, E. Otero, Eric Beaurepaire, F. Scheurer, and José Antonio Real

Subjects
Absorption spectroscopy, Spin states, Chemistry, Chimie/Matériaux, Metastability, Excited state, Transition temperature, General Physics and Astronomy, Physical and Theoretical Chemistry, Atmospheric temperature range, Atomic physics, LIESST, Spin-½
Abstract

The dynamics of the soft x-ray induced excited spin state trapping (SOXIESST) effect of Fe(phen)(2)(NCS)(2) (Fe-phen) powder have been investigated by x-ray absorption spectroscopy (XAS) using the total electron yield method, in a wide temperature range. The low-spin (LS) state is excited into the metastable high-spin (HS) state at a rate that depends on the intensity of the x-ray illumination it receives, and both the temperature and the intensity of the x-ray illumination will affect the maximum HS proportion that is reached. We find that the SOXIESST HS spin state transforms back to the LS state at a rate that is similar to that found for the light induced excited spin state trapping (LIESST) effect. We show that it is possible to use the SOXIESST effect in combination with the LIESST effect to investigate the influence of cooperative behavior on the dynamics of both effects. To investigate the impact of molecular cooperativity, we compare our results on Fe-phen with those obtained for Fe[Me(2)Pyrz](3)BH(2) (Fe-pyrz) powder, which exhibits a similar thermal transition temperature but with a hysteresis. We find that, while the time constant of the dynamic is identical for both molecules, the SOXIESST effect is less efficient at exciting the HS state in Fe-pyrz than in Fe-phen. (C) 2013 AIP Publishing LLC.

Published
2013

26. Growth and structure of Cr ultra-thin films deposited on Co(0001)

Author

F. Scheurer, J.P. Deville, A. Dobroiu, B. Carrière, and Philippe Ohresser

Subjects
Auger electron spectroscopy, Materials science, Low-energy electron diffraction, Analytical chemistry, Crystal growth, Surfaces and Interfaces, Substrate (electronics), Condensed Matter Physics, Epitaxy, Surfaces, Coatings and Films, Crystallography, Materials Chemistry, Thin film, Single crystal, Molecular beam epitaxy
Abstract

The growth and structure of ultra-thin Cr films deposited on a Co(0001) single crystal are investigated for substrate temperatures ranging from 300 to 500 K by means of Auger electron spectroscopy, low energy electron diffraction and photoemission. For room temperature growth, the interface is sharp and the Cr layers arrange in a Nishiyama-Wassermann-type epitaxy. At elevated temperatures the interface is diffuse and a Kurdjumov-Sachs orientation is observed.

Published
1996

27. Inclusive and differential measurements of the tt- charge asymmetry in proton-proton collisions at s=7 TeV

Author

Chatrchyan, S. Khachatryan, V. Sirunyan, A.M. Tumasyan, A. Adam, W. Aguilo, E. Bergauer, T. Dragicevic, M. Erö, J. Fabjan, C. Friedl, M. Frühwirth, R. Ghete, V.M. Hammer, J. Hörmann, N. Hrubec, J. Jeitler, M. Kiesenhofer, W. Knünz, V. Krammer, M. Liko, D. Mikulec, I. Pernicka, M. Rahbaran, B. Rohringer, C. Rohringer, H. Schöfbeck, R. Strauss, J. Taurok, A. Wagner, P. Waltenberger, W. Walzel, G. Widl, E. Wulz, C.-E. Mossolov, V. Shumeiko, N. Suarez Gonzalez, J. Bansal, S. Cornelis, T. De Wolf, E.A. Janssen, X. Luyckx, S. Mucibello, L. Ochesanu, S. Roland, B. Rougny, R. Selvaggi, M. Staykova, Z. Van Haevermaet, H. Van Mechelen, P. Van Remortel, N. Van Spilbeeck, A. Blekman, F. Blyweert, S. D'Hondt, J. Gonzalez Suarez, R. Kalogeropoulos, A. Maes, M. Olbrechts, A. Van Doninck, W. Van Mulders, P. Van Onsem, G.P. Villella, I. Clerbaux, B. De Lentdecker, G. Dero, V. Gay, A.P.R. Hreus, T. Léonard, A. Marage, P.E. Reis, T. Thomas, L. Vander Velde, C. Vanlaer, P. Wang, J. Adler, V. Beernaert, K. Cimmino, A. Costantini, S. Garcia, G. Grunewald, M. Klein, B. Lellouch, J. Marinov, A. McCartin, J. Ocampo Rios, A.A. Ryckbosch, D. Strobbe, N. Thyssen, F. Tytgat, M. Verwilligen, P. Walsh, S. Yazgan, E. Zaganidis, N. Basegmez, S. Bruno, G. Castello, R. Ceard, L. Delaere, C. du Pree, T. Favart, D. Forthomme, L. Giammanco, A. Hollar, J. Lemaitre, V. Liao, J. Militaru, O. Nuttens, C. Pagano, D. Pin, A. Piotrzkowski, K. Schul, N. Vizan Garcia, J.M. Beliy, N. Caebergs, T. Daubie, E. Hammad, G.H. Alves, G.A. Correa Martins, M. De Jesus Damiao, D. Martins, T. Pol, M.E. Souza, M.H.G. Aldá, W.L. Carvalho, W. Custódio, A. Da Costa, E.M. De Oliveira Martins, C. Fonseca De Souza, S. Matos Figueiredo, D. Mundim, L. Nogima, H. Oguri, V. Prado Da Silva, W.L. Santoro, A. Soares Jorge, L. Sznajder, A. Bernardes, C.A. Dias, F.A. Fernandez Perez Tomei, T.R. Gregores, E.M. Lagana, C. Marinho, F. Mercadante, P.G. Novaes, S.F. Padula, S.S. Genchev, V. Iaydjiev, P. Piperov, S. Rodozov, M. Stoykova, S. Sultanov, G. Tcholakov, V. Trayanov, R. Vutova, M. Dimitrov, A. Hadjiiska, R. Kozhuharov, V. Litov, L. Pavlov, B. Petkov, P. Bian, J.G. Chen, G.M. Chen, H.S. Jiang, C.H. Liang, D. Liang, S. Meng, X. Tao, J. Wang, J. Wang, X. Wang, Z. Xiao, H. Xu, M. Zang, J. Zhang, Z. Asawatangtrakuldee, C. Ban, Y. Guo, S. Guo, Y. Li, W. Liu, S. Mao, Y. Qian, S.J. Teng, H. Wang, D. Zhang, L. Zhu, B. Zou, W. Avila, C. Gomez, J.P. Gomez Moreno, B. Osorio Oliveros, A.F. Sanabria, J.C. Godinovic, N. Lelas, D. Plestina, R. Polic, D. Puljak, I. Antunovic, Z. Kovac, M. Brigljevic, V. Duric, S. Kadija, K. Luetic, J. Morovic, S. Attikis, A. Galanti, M. Mavromanolakis, G. Mousa, J. Nicolaou, C. Ptochos, F. Razis, P.A. Finger, M. Finger, M. Assran, Y. Elgammal, S. Ellithi Kamel, A. Khalil, S. Mahmoud, M.A. Radi, A. Kadastik, M. Müntel, M. Raidal, M. Rebane, L. Tiko, A. Eerola, P. Fedi, G. Voutilainen, M. Härkönen, J. Heikkinen, A. Karimäki, V. Kinnunen, R. Kortelainen, M.J. Lampén, T. Lassila-Perini, K. Lehti, S. Lindén, T. Luukka, P. Mäenpää, T. Peltola, T. Tuominen, E. Tuominiemi, J. Tuovinen, E. Ungaro, D. Wendland, L. Banzuzi, K. Karjalainen, A. Korpela, A. Tuuva, T. Besancon, M. Choudhury, S. Dejardin, M. Denegri, D. Fabbro, B. Faure, J.L. Ferri, F. Ganjour, S. Givernaud, A. Gras, P. Hamel de Monchenault, G. Jarry, P. Locci, E. Malcles, J. Millischer, L. Nayak, A. Rander, J. Rosowsky, A. Shreyber, I. Titov, M. Baffioni, S. Beaudette, F. Benhabib, L. Bianchini, L. Bluj, M. Broutin, C. Busson, P. Charlot, C. Daci, N. Dahms, T. Dobrzynski, L. Granier de Cassagnac, R. Haguenauer, M. Miné, P. Mironov, C. Nguyen, M. Ochando, C. Paganini, P. Sabes, D. Salerno, R. Sirois, Y. Veelken, C. Zabi, A. Agram, J.-L. Andrea, J. Bloch, D. Bodin, D. Brom, J.-M. Cardaci, M. Chabert, E.C. Collard, C. Conte, E. Drouhin, F. Ferro, C. Fontaine, J.-C. Gelé, D. Goerlach, U. Juillot, P. Le Bihan, A.-C. Van Hove, P. Fassi, F. Mercier, D. Beauceron, S. Beaupere, N. Bondu, O. Boudoul, G. Chasserat, J. Chierici, R. Contardo, D. Depasse, P. El Mamouni, H. Fay, J. Gascon, S. Gouzevitch, M. Ille, B. Kurca, T. Lethuillier, M. Mirabito, L. Perries, S. Sordini, V. Tosi, S. Tschudi, Y. Verdier, P. Viret, S. Roinishvili, V. Anagnostou, G. Beranek, S. Edelhoff, M. Feld, L. Heracleous, N. Hindrichs, O. Jussen, R. Klein, K. Merz, J. Ostapchuk, A. Perieanu, A. Raupach, F. Sammet, J. Schael, S. Sprenger, D. Weber, H. Wittmer, B. Zhukov, V. Ata, M. Caudron, J. Dietz-Laursonn, E. Duchardt, D. Erdmann, M. Fischer, R. Güth, A. Hebbeker, T. Heidemann, C. Hoepfner, K. Klingebiel, D. Kreuzer, P. Lingemann, J. Magass, C. Merschmeyer, M. Meyer, A. Olschewski, M. Papacz, P. Pieta, H. Reithler, H. Schmitz, S.A. Sonnenschein, L. Steggemann, J. Teyssier, D. Weber, M. Bontenackels, M. Cherepanov, V. Flügge, G. Geenen, H. Geisler, M. Haj Ahmad, W. Hoehle, F. Kargoll, B. Kress, T. Kuessel, Y. Nowack, A. Perchalla, L. Pooth, O. Rennefeld, J. Sauerland, P. Stahl, A. Aldaya Martin, M. Behr, J. Behrenhoff, W. Behrens, U. Bergholz, M. Bethani, A. Borras, K. Burgmeier, A. Cakir, A. Calligaris, L. Campbell, A. Castro, E. Costanza, F. Dammann, D. Diez Pardos, C. Eckerlin, G. Eckstein, D. Flucke, G. Geiser, A. Glushkov, I. Gunnellini, P. Habib, S. Hauk, J. Hellwig, G. Jung, H. Kasemann, M. Katsas, P. Kleinwort, C. Kluge, H. Knutsson, A. Krämer, M. Krücker, D. Kuznetsova, E. Lange, W. Lohmann, W. Lutz, B. Mankel, R. Marfin, I. Marienfeld, M. Melzer-Pellmann, I.-A. Meyer, A.B. Mnich, J. Mussgiller, A. Naumann-Emme, S. Olzem, J. Perrey, H. Petrukhin, A. Pitzl, D. Raspereza, A. Ribeiro Cipriano, P.M. Riedl, C. Ron, E. Rosin, M. Salfeld-Nebgen, J. Schmidt, R. Schoerner-Sadenius, T. Sen, N. Spiridonov, A. Stein, M. Walsh, R. Wissing, C. Autermann, C. Blobel, V. Draeger, J. Enderle, H. Erfle, J. Gebbert, U. Görner, M. Hermanns, T. Höing, R.S. Kaschube, K. Kaussen, G. Kirschenmann, H. Klanner, R. Lange, J. Mura, B. Nowak, F. Peiffer, T. Pietsch, N. Rathjens, D. Sander, C. Schettler, H. Schleper, P. Schlieckau, E. Schmidt, A. Schröder, M. Schum, T. Seidel, M. Sola, V. Stadie, H. Steinbrück, G. Thomsen, J. Vanelderen, L. Barth, C. Berger, J. Böser, C. Chwalek, T. De Boer, W. Descroix, A. Dierlamm, A. Feindt, M. Guthoff, M. Hackstein, C. Hartmann, F. Hauth, T. Heinrich, M. Held, H. Hoffmann, K.H. Honc, S. Katkov, I. Komaragiri, J.R. Lobelle Pardo, P. Martschei, D. Mueller, S. Müller, T. Niegel, M. Nürnberg, A. Oberst, O. Oehler, A. Ott, J. Quast, G. Rabbertz, K. Ratnikov, F. Ratnikova, N. Röcker, S. Roscher, F. Scheurer, A. Schilling, F.-P. Schott, G. Simonis, H.J. Stober, F.M. Troendle, D. Ulrich, R. Wagner-Kuhr, J. Wayand, S. Weiler, T. Zeise, M. Daskalakis, G. Geralis, T. Kesisoglou, S. Kyriakis, A. Loukas, D. Manolakos, I. Markou, A. Markou, C. Mavrommatis, C. Ntomari, E. Gouskos, L. Mertzimekis, T.J. Panagiotou, A. Saoulidou, N. Evangelou, I. Foudas, C. Kokkas, P. Manthos, N. Papadopoulos, I. Patras, V. Bencze, G. Hajdu, C. Hidas, P. Horvath, D. Sikler, F. Veszpremi, V. Vesztergombi, G. Beni, N. Czellar, S. Molnar, J. Palinkas, J. Szillasi, Z. Karancsi, J. Raics, P. Trocsanyi, Z.L. Ujvari, B. Beri, S.B. Bhatnagar, V. Dhingra, N. Gupta, R. Jindal, M. Kaur, M. Mehta, M.Z. Nishu, N. Saini, L.K. Sharma, A. Singh, J. Kumar, A. Kumar, A. Ahuja, S. Bhardwaj, A. Choudhary, B.C. Malhotra, S. Naimuddin, M. Ranjan, K. Sharma, V. Shivpuri, R.K. Banerjee, S. Bhattacharya, S. Dutta, S. Gomber, B. Jain, S. Jain, S. Khurana, R. Sarkar, S. Sharan, M. Abdulsalam, A. Choudhury, R.K. Dutta, D. Kailas, S. Kumar, V. Mehta, P. Mohanty, A.K. Pant, L.M. Shukla, P. Aziz, T. Ganguly, S. Guchait, M. Maity, M. Majumder, G. Mazumdar, K. Mohanty, G.B. Parida, B. Sudhakar, K. Wickramage, N. Banerjee, S. Dugad, S. Arfaei, H. Bakhshiansohi, H. Etesami, S.M. Fahim, A. Hashemi, M. Hesari, H. Jafari, A. Khakzad, M. Mohammadi Najafabadi, M. Paktinat Mehdiabadi, S. Safarzadeh, B. Zeinali, M. Abbrescia, M. Barbone, L. Calabria, C. Chhibra, S.S. Colaleo, A. Creanza, D. De Filippis, N. De Palma, M. Fiore, L. Iaselli, G. Lusito, L. Maggi, G. Maggi, M. Marangelli, B. My, S. Nuzzo, S. Pacifico, N. Pompili, A. Pugliese, G. Selvaggi, G. Silvestris, L. Singh, G. Venditti, R. Zito, G. Abbiendi, G. Benvenuti, A.C. Bonacorsi, D. Braibant-Giacomelli, S. Brigliadori, L. Capiluppi, P. Castro, A. Cavallo, F.R. Cuffiani, M. Dallavalle, G.M. Fabbri, F. Fanfani, A. Fasanella, D. Giacomelli, P. Grandi, C. Guiducci, L. Marcellini, S. Masetti, G. Meneghelli, M. Montanari, A. Navarria, F.L. Odorici, F. Perrotta, A. Primavera, F. Rossi, A.M. Rovelli, T. Siroli, G. Travaglini, R. Albergo, S. Cappello, G. Chiorboli, M. Costa, S. Potenza, R. Tricomi, A. Tuve, C. Barbagli, G. Ciulli, V. Civinini, C. D'Alessandro, R. Focardi, E. Frosali, S. Gallo, E. Gonzi, S. Meschini, M. Paoletti, S. Sguazzoni, G. Tropiano, A. Benussi, L. Bianco, S. Colafranceschi, S. Fabbri, F. Piccolo, D. Fabbricatore, P. Musenich, R. Benaglia, A. De Guio, F. Di Matteo, L. Fiorendi, S. Gennai, S. Ghezzi, A. Malvezzi, S. Manzoni, R.A. Martelli, A. Massironi, A. Menasce, D. Moroni, L. Paganoni, M. Pedrini, D. Ragazzi, S. Redaelli, N. Sala, S. Tabarelli de Fatis, T. Buontempo, S. Carrillo Montoya, C.A. Cavallo, N. De Cosa, A. Dogangun, O. Fabozzi, F. Iorio, A.O.M. Lista, L. Meola, S. Merola, M. Paolucci, P. Azzi, P. Bacchetta, N. Bisello, D. Branca, A. Carlin, R. Checchia, P. Dorigo, T. Dosselli, U. Gasparini, F. Gasparini, U. Gozzelino, A. Kanishchev, K. Lacaprara, S. Lazzizzera, I. Margoni, M. Meneguzzo, A.T. Pazzini, J. Pozzobon, N. Ronchese, P. Simonetto, F. Torassa, E. Tosi, M. Vanini, S. Zotto, P. Zumerle, G. Gabusi, M. Ratti, S.P. Riccardi, C. Torre, P. Vitulo, P. Biasini, M. Bilei, G.M. Fanò, L. Lariccia, P. Lucaroni, A. Mantovani, G. Menichelli, M. Nappi, A. Romeo, F. Saha, A. Santocchia, A. Spiezia, A. Taroni, S. Azzurri, P. Bagliesi, G. Boccali, T. Broccolo, G. Castaldi, R. D'Agnolo, R.T. Dell'Orso, R. Fiori, F. Foà, L. Giassi, A. Kraan, A. Ligabue, F. Lomtadze, T. Martini, L. Messineo, A. Palla, F. Rizzi, A. Serban, A.T. Spagnolo, P. Squillacioti, P. Tenchini, R. Tonelli, G. Venturi, A. Verdini, P.G. Barone, L. Cavallari, F. Del Re, D. Diemoz, M. Grassi, M. Longo, E. Meridiani, P. Micheli, F. Nourbakhsh, S. Organtini, G. Paramatti, R. Rahatlou, S. Sigamani, M. Soffi, L. Amapane, N. Arcidiacono, R. Argiro, S. Arneodo, M. Biino, C. Cartiglia, N. Costa, M. Demaria, N. Mariotti, C. Maselli, S. Migliore, E. Monaco, V. Musich, M. Obertino, M.M. Pastrone, N. Pelliccioni, M. Potenza, A. Romero, A. Ruspa, M. Sacchi, R. Solano, A. Staiano, A. Vilela Pereira, A. Belforte, S. Candelise, V. Cossutti, F. Della Ricca, G. Gobbo, B. Marone, M. Montanino, D. Penzo, A. Schizzi, A. Heo, S.G. Kim, T.Y. Nam, S.K. Chang, S. Kim, D.H. Kim, G.N. Kong, D.J. Park, H. Ro, S.R. Son, D.C. Son, T. Kim, J.Y. Kim, Z.J. Song, S. Choi, S. Gyun, D. Hong, B. Jo, M. Kim, H. Kim, T.J. Lee, K.S. Moon, D.H. Park, S.K. Choi, M. Kim, J.H. Park, C. Park, I.C. Park, S. Ryu, G. Cho, Y. Choi, Y. Choi, Y.K. Goh, J. Kim, M.S. Kwon, E. Lee, B. Lee, J. Lee, S. Seo, H. Yu, I. Bilinskas, M.J. Grigelionis, I. Janulis, M. Juodagalvis, A. Castilla-Valdez, H. De La Cruz-Burelo, E. Heredia-de La Cruz, I. Lopez-Fernandez, R. Magaña Villalba, R. Martínez-Ortega, J. Sánchez-Hernández, A. Villasenor-Cendejas, L.M. Carrillo Moreno, S. Vazquez Valencia, F. Salazar Ibarguen, H.A. Casimiro Linares, E. Morelos Pineda, A. Reyes-Santos, M.A. Krofcheck, D. Bell, A.J. Butler, P.H. Doesburg, R. Reucroft, S. Silverwood, H. Ahmad, M. Asghar, M.I. Hoorani, H.R. Khalid, S. Khan, W.A. Khurshid, T. Qazi, S. Shah, M.A. Shoaib, M. Brona, G. Bunkowski, K. Cwiok, M. Dominik, W. Doroba, K. Kalinowski, A. Konecki, M. Krolikowski, J. Bialkowska, H. Boimska, B. Frueboes, T. Gokieli, R. Górski, M. Kazana, M. Nawrocki, K. Romanowska-Rybinska, K. Szleper, M. Wrochna, G. Zalewski, P. Almeida, N. Bargassa, P. David, A. Faccioli, P. Ferreira Parracho, P.G. Gallinaro, M. Seixas, J. Varela, J. Vischia, P. Belotelov, I. Bunin, P. Gavrilenko, M. Golutvin, I. Gorbunov, I. Kamenev, A. Karjavin, V. Kozlov, G. Lanev, A. Malakhov, A. Moisenz, P. Palichik, V. Perelygin, V. Shmatov, S. Smirnov, V. Volodko, A. Zarubin, A. Evstyukhin, S. Golovtsov, V. Ivanov, Y. Kim, V. Levchenko, P. Murzin, V. Oreshkin, V. Smirnov, I. Sulimov, V. Uvarov, L. Vavilov, S. Vorobyev, A. Vorobyev, A. Andreev, Y. Dermenev, A. Gninenko, S. Golubev, N. Kirsanov, M. Krasnikov, N. Matveev, V. Pashenkov, A. Tlisov, D. Toropin, A. Epshteyn, V. Erofeeva, M. Gavrilov, V. Kossov, M. Lychkovskaya, N. Popov, V. Safronov, G. Semenov, S. Stolin, V. Vlasov, E. Zhokin, A. Belyaev, A. Boos, E. Bunichev, V. Dubinin, M. Dudko, L. Ershov, A. Klyukhin, V. Kodolova, O. Lokhtin, I. Markina, A. Obraztsov, S. Perfilov, M. Petrushanko, S. Popov, A. Sarycheva, L. Savrin, V. Snigirev, A. Andreev, V. Azarkin, M. Dremin, I. Kirakosyan, M. Leonidov, A. Mesyats, G. Rusakov, S.V. Vinogradov, A. Azhgirey, I. Bayshev, I. Bitioukov, S. Grishin, V. Kachanov, V. Konstantinov, D. Korablev, A. Krychkine, V. Petrov, V. Ryutin, R. Sobol, A. Tourtchanovitch, L. Troshin, S. Tyurin, N. Uzunian, A. Volkov, A. Adzic, P. Djordjevic, M. Ekmedzic, M. Krpic, D. Milosevic, J. Aguilar-Benitez, M. Alcaraz Maestre, J. Arce, P. Battilana, C. Calvo, E. Cerrada, M. Chamizo Llatas, M. Colino, N. De La Cruz, B. Delgado Peris, A. Domínguez Vázquez, D. Fernandez Bedoya, C. Fernández Ramos, J.P. Ferrando, A. Flix, J. Fouz, M.C. Garcia-Abia, P. Gonzalez Lopez, O. Goy Lopez, S. Hernandez, J.M. Josa, M.I. Merino, G. Puerta Pelayo, J. Quintario Olmeda, A. Redondo, I. Romero, L. Santaolalla, J. Soares, M.S. Willmott, C. Albajar, C. Codispoti, G. de Trocóniz, J.F. Brun, H. Cuevas, J. Fernandez Menendez, J. Folgueras, S. Gonzalez Caballero, I. Lloret Iglesias, L. Piedra Gomez, J. Brochero Cifuentes, J.A. Cabrillo, I.J. Calderon, A. Chuang, S.H. Duarte Campderros, J. Felcini, M. Fernandez, M. Gomez, G. Gonzalez Sanchez, J. Graziano, A. Jorda, C. Lopez Virto, A. Marco, J. Marco, R. Martinez Rivero, C. Matorras, F. Munoz Sanchez, F.J. Rodrigo, T. Rodríguez-Marrero, A.Y. Ruiz-Jimeno, A. Scodellaro, L. Sobron Sanudo, M. Vila, I. Vilar Cortabitarte, R. Abbaneo, D. Auffray, E. Auzinger, G. Baillon, P. Ball, A.H. Barney, D. Benitez, J.F. Bernet, C. Bianchi, G. Bloch, P. Bocci, A. Bonato, A. Botta, C. Breuker, H. Camporesi, T. Cerminara, G. Christiansen, T. Coarasa Perez, J.A. D'Enterria, D. Dabrowski, A. De Roeck, A. Di Guida, S. Dobson, M. Dupont-Sagorin, N. Elliott-Peisert, A. Frisch, B. Funk, W. Georgiou, G. Giffels, M. Gigi, D. Gill, K. Giordano, D. Giunta, M. Glege, F. Gomez-Reino Garrido, R. Govoni, P. Gowdy, S. Guida, R. Hansen, M. Harris, P. Hartl, C. Harvey, J. Hegner, B. Hinzmann, A. Innocente, V. Janot, P. Kaadze, K. Karavakis, E. Kousouris, K. Lecoq, P. Lee, Y.-J. Lenzi, P. Lourenço, C. Mäki, T. Malberti, M. Malgeri, L. Mannelli, M. Masetti, L. Meijers, F. Mersi, S. Meschi, E. Moser, R. Mozer, M.U. Mulders, M. Musella, P. Nesvold, E. Orimoto, T. Orsini, L. Palencia Cortezon, E. Perez, E. Perrozzi, L. Petrilli, A. Pfeiffer, A. Pierini, M. Pimiä, M. Piparo, D. Polese, G. Quertenmont, L. Racz, A. Reece, W. Rodrigues Antunes, J. Rolandi, G. Rommerskirchen, T. Rovelli, C. Rovere, M. Sakulin, H. Santanastasio, F. Schäfer, C. Schwick, C. Segoni, I. Sekmen, S. Sharma, A. Siegrist, P. Silva, P. Simon, M. Sphicas, P. Spiga, D. Tsirou, A. Veres, G.I. Vlimant, J.R. Wöhri, H.K. Worm, S.D. Zeuner, W.D. Bertl, W. Deiters, K. Erdmann, W. Gabathuler, K. Horisberger, R. Ingram, Q. Kaestli, H.C. König, S. Kotlinski, D. Langenegger, U. Meier, F. Renker, D. Rohe, T. Sibille, J. Bäni, L. Bortignon, P. Buchmann, M.A. Casal, B. Chanon, N. Deisher, A. Dissertori, G. Dittmar, M. Dünser, M. Eugster, J. Freudenreich, K. Grab, C. Hits, D. Lecomte, P. Lustermann, W. Marini, A.C. Martinez Ruiz del Arbol, P. Mohr, N. Moortgat, F. Nägeli, C. Nef, P. Nessi-Tedaldi, F. Pandolfi, F. Pape, L. Pauss, F. Peruzzi, M. Ronga, F.J. Rossini, M. Sala, L. Sanchez, A.K. Starodumov, A. Stieger, B. Takahashi, M. Tauscher, L. Thea, A. Theofilatos, K. Treille, D. Urscheler, C. Wallny, R. Weber, H.A. Wehrli, L. Amsler, C. Chiochia, V. De Visscher, S. Favaro, C. Ivova Rikova, M. Millan Mejias, B. Otiougova, P. Robmann, P. Snoek, H. Tupputi, S. Verzetti, M. Chang, Y.H. Chen, K.H. Kuo, C.M. Li, S.W. Lin, W. Liu, Z.K. Lu, Y.J. Mekterovic, D. Singh, A.P. Volpe, R. Yu, S.S. Bartalini, P. Chang, P. Chang, Y.H. Chang, Y.W. Chao, Y. Chen, K.F. Dietz, C. Grundler, U. Hou, W.-S. Hsiung, Y. Kao, K.Y. Lei, Y.J. Lu, R.-S. Majumder, D. Petrakou, E. Shi, X. Shiu, J.G. Tzeng, Y.M. Wan, X. Wang, M. Adiguzel, A. Bakirci, M.N. Cerci, S. Dozen, C. Dumanoglu, I. Eskut, E. Girgis, S. Gokbulut, G. Gurpinar, E. Hos, I. Kangal, E.E. Karaman, T. Karapinar, G. Kayis Topaksu, A. Onengut, G. Ozdemir, K. Ozturk, S. Polatoz, A. Sogut, K. Sunar Cerci, D. Tali, B. Topakli, H. Vergili, L.N. Vergili, M. Akin, I.V. Aliev, T. Bilin, B. Bilmis, S. Deniz, M. Gamsizkan, H. Guler, A.M. Ocalan, K. Ozpineci, A. Serin, M. Sever, R. Surat, U.E. Yalvac, M. Yildirim, E. Zeyrek, M. Gülmez, E. Isildak, B. Kaya, M. Kaya, O. Ozkorucuklu, S. Sonmez, N. Cankocak, K. Levchuk, L. Bostock, F. Brooke, J.J. Clement, E. Cussans, D. Flacher, H. Frazier, R. Goldstein, J. Grimes, M. Heath, G.P. Heath, H.F. Kreczko, L. Metson, S. Newbold, D.M. Nirunpong, K. Poll, A. Senkin, S. Smith, V.J. Williams, T. Basso, L. Bell, K.W. Belyaev, A. Brew, C. Brown, R.M. Cockerill, D.J.A. Coughlan, J.A. Harder, K. Harper, S. Jackson, J. Kennedy, B.W. Olaiya, E. Petyt, D. Radburn-Smith, B.C. Shepherd-Themistocleous, C.H. Tomalin, I.R. Womersley, W.J. Bainbridge, R. Ball, G. Beuselinck, R. Buchmuller, O. Colling, D. Cripps, N. Cutajar, M. Dauncey, P. Davies, G. Della Negra, M. Ferguson, W. Fulcher, J. Futyan, D. Gilbert, A. Guneratne Bryer, A. Hall, G. Hatherell, Z. Hays, J. Iles, G. Jarvis, M. Karapostoli, G. Lyons, L. Magnan, A.-M. Marrouche, J. Mathias, B. Nandi, R. Nash, J. Nikitenko, A. Papageorgiou, A. Pela, J. Pesaresi, M. Petridis, K. Pioppi, M. Raymond, D.M. Rogerson, S. Rose, A. Ryan, M.J. Seez, C. Sharp, P. Sparrow, A. Stoye, M. Tapper, A. Vazquez Acosta, M. Virdee, T. Wakefield, S. Wardle, N. Whyntie, T. Chadwick, M. Cole, J.E. Hobson, P.R. Khan, A. Kyberd, P. Leggat, D. Leslie, D. Martin, W. Reid, I.D. Symonds, P. Teodorescu, L. Turner, M. Hatakeyama, K. Liu, H. Scarborough, T. Charaf, O. Henderson, C. Rumerio, P. Avetisyan, A. Bose, T. Fantasia, C. Heister, A. St. John, J. Lawson, P. Lazic, D. Rohlf, J. Sperka, D. Sulak, L. Alimena, J. Bhattacharya, S. Cutts, D. Ferapontov, A. Heintz, U. Jabeen, S. Kukartsev, G. Laird, E. Landsberg, G. Luk, M. Narain, M. Nguyen, D. Segala, M. Sinthuprasith, T. Speer, T. Tsang, K.V. Breedon, R. Breto, G. Calderon De La Barca Sanchez, M. Chauhan, S. Chertok, M. Conway, J. Conway, R. Cox, P.T. Dolen, J. Erbacher, R. Gardner, M. Houtz, R. Ko, W. Kopecky, A. Lander, R. Miceli, T. Pellett, D. Ricci-Tam, F. Rutherford, B. Searle, M. Smith, J. Squires, M. Tripathi, M. Vasquez Sierra, R. Andreev, V. Cline, D. Cousins, R. Duris, J. Erhan, S. Everaerts, P. Farrell, C. Hauser, J. Ignatenko, M. Jarvis, C. Plager, C. Rakness, G. Schlein, P. Tucker, J. Valuev, V. Weber, M. Babb, J. Clare, R. Dinardo, M.E. Ellison, J. Gary, J.W. Giordano, F. Hanson, G. Jeng, G.Y. Liu, H. Long, O.R. Luthra, A. Nguyen, H. Paramesvaran, S. Sturdy, J. Sumowidagdo, S. Wilken, R. Wimpenny, S. Andrews, W. Branson, J.G. Cerati, G.B. Cittolin, S. Evans, D. Golf, F. Holzner, A. Kelley, R. Lebourgeois, M. Letts, J. MacNeill, I. Mangano, B. Padhi, S. Palmer, C. Petrucciani, G. Pieri, M. Sani, M. Sharma, V. Simon, S. Sudano, E. Tadel, M. Tu, Y. Vartak, A. Wasserbaech, S. Würthwein, F. Yagil, A. Yoo, J. Barge, D. Bellan, R. Campagnari, C. D'Alfonso, M. Danielson, T. Flowers, K. Geffert, P. Incandela, J. Justus, C. Kalavase, P. Koay, S.A. Kovalskyi, D. Krutelyov, V. Lowette, S. McColl, N. Pavlunin, V. Rebassoo, F. Ribnik, J. Richman, J. Rossin, R. Stuart, D. To, W. West, C. Apresyan, A. Bornheim, A. Chen, Y. Di Marco, E. Duarte, J. Gataullin, M. Ma, Y. Mott, A. Newman, H.B. Rogan, C. Spiropulu, M. Timciuc, V. Traczyk, P. Veverka, J. Wilkinson, R. Yang, Y. Zhu, R.Y. Akgun, B. Azzolini, V. Carroll, R. Ferguson, T. Iiyama, Y. Jang, D.W. Liu, Y.F. Paulini, M. Vogel, H. Vorobiev, I. Cumalat, J.P. Drell, B.R. Edelmaier, C.J. Ford, W.T. Gaz, A. Heyburn, B. Luiggi Lopez, E. Smith, J.G. Stenson, K. Ulmer, K.A. Wagner, S.R. Alexander, J. Chatterjee, A. Eggert, N. Gibbons, L.K. Heltsley, B. Khukhunaishvili, A. Kreis, B. Mirman, N. Nicolas Kaufman, G. Patterson, J.R. Ryd, A. Salvati, E. Sun, W. Teo, W.D. Thom, J. Thompson, J. Vaughan, J. Weng, Y. Winstrom, L. Wittich, P. Winn, D. Abdullin, S. Albrow, M. Anderson, J. Bauerdick, L.A.T. Beretvas, A. Berryhill, J. Bhat, P.C. Bloch, I. Burkett, K. Butler, J.N. Chetluru, V. Cheung, H.W.K. Chlebana, F. Elvira, V.D. Fisk, I. Freeman, J. Gao, Y. Green, D. Gutsche, O. Hanlon, J. Harris, R.M. Hirschauer, J. Hooberman, B. Jindariani, S. Johnson, M. Joshi, U. Kilminster, B. Klima, B. Kunori, S. Kwan, S. Leonidopoulos, C. Linacre, J. Lincoln, D. Lipton, R. Lykken, J. Maeshima, K. Marraffino, J.M. Maruyama, S. Mason, D. McBride, P. Mishra, K. Mrenna, S. Musienko, Y. Newman-Holmes, C. O'Dell, V. Prokofyev, O. Sexton-Kennedy, E. Sharma, S. Spalding, W.J. Spiegel, L. Tan, P. Taylor, L. Tkaczyk, S. Tran, N.V. Uplegger, L. Vaandering, E.W. Vidal, R. Whitmore, J. Wu, W. Yang, F. Yumiceva, F. Yun, J.C. Acosta, D. Avery, P. Bourilkov, D. Chen, M. Cheng, T. Das, S. De Gruttola, M. Di Giovanni, G.P. Dobur, D. Drozdetskiy, A. Field, R.D. Fisher, M. Fu, Y. Furic, I.K. Gartner, J. Hugon, J. Kim, B. Konigsberg, J. Korytov, A. Kropivnitskaya, A. Kypreos, T. Low, J.F. Matchev, K. Milenovic, P. Mitselmakher, G. Muniz, L. Remington, R. Rinkevicius, A. Sellers, P. Skhirtladze, N. Snowball, M. Yelton, J. Zakaria, M. Gaultney, V. Lebolo, L.M. Linn, S. Markowitz, P. Martinez, G. Rodriguez, J.L. Adams, T. Askew, A. Bochenek, J. Chen, J. Diamond, B. Gleyzer, S.V. Haas, J. Hagopian, S. Hagopian, V. Jenkins, M. Johnson, K.F. Prosper, H. Veeraraghavan, V. Weinberg, M. Baarmand, M.M. Dorney, B. Hohlmann, M. Kalakhety, H. Vodopiyanov, I. Adams, M.R. Anghel, I.M. Apanasevich, L. Bai, Y. Bazterra, V.E. Betts, R.R. Bucinskaite, I. Callner, J. Cavanaugh, R. Dragoiu, C. Evdokimov, O. Gauthier, L. Gerber, C.E. Hofman, D.J. Khalatyan, S. Lacroix, F. Malek, M. O'Brien, C. Silkworth, C. Strom, D. Varelas, N. Akgun, U. Albayrak, E.A. Bilki, B. Clarida, W. Duru, F. Griffiths, S. Merlo, J.-P. Mermerkaya, H. Mestvirishvili, A. Moeller, A. Nachtman, J. Newsom, C.R. Norbeck, E. Onel, Y. Ozok, F. Sen, S. Tiras, E. Wetzel, J. Yetkin, T. Yi, K. Barnett, B.A. Blumenfeld, B. Bolognesi, S. Fehling, D. Giurgiu, G. Gritsan, A.V. Guo, Z.J. Hu, G. Maksimovic, P. Rappoccio, S. Swartz, M. Whitbeck, A. Baringer, P. Bean, A. Benelli, G. Grachov, O. Kenny Iii, R.P. Murray, M. Noonan, D. Sanders, S. Stringer, R. Tinti, G. Wood, J.S. Zhukova, V. Barfuss, A.F. Bolton, T. Chakaberia, I. Ivanov, A. Khalil, S. Makouski, M. Maravin, Y. Shrestha, S. Svintradze, I. Gronberg, J. Lange, D. Wright, D. Baden, A. Boutemeur, M. Calvert, B. Eno, S.C. Gomez, J.A. Hadley, N.J. Kellogg, R.G. Kirn, M. Kolberg, T. Lu, Y. Marionneau, M. Mignerey, A.C. Pedro, K. Peterman, A. Skuja, A. Temple, J. Tonjes, M.B. Tonwar, S.C. Twedt, E. Apyan, A. Bauer, G. Bendavid, J. Busza, W. Butz, E. Cali, I.A. Chan, M. Dutta, V. Gomez Ceballos, G. Goncharov, M. Hahn, K.A. Kim, Y. Klute, M. Krajczar, K. Li, W. Luckey, P.D. Ma, T. Nahn, S. Paus, C. Ralph, D. Roland, C. Roland, G. Rudolph, M. Stephans, G.S.F. Stöckli, F. Sumorok, K. Sung, K. Velicanu, D. Wenger, E.A. Wolf, R. Wyslouch, B. Xie, S. Yang, M. Yilmaz, Y. Yoon, A.S. Zanetti, M. Cooper, S.I. Dahmes, B. De Benedetti, A. Franzoni, G. Gude, A. Kao, S.C. Klapoetke, K. Kubota, Y. Mans, J. Pastika, N. Rusack, R. Sasseville, M. Singovsky, A. Tambe, N. Turkewitz, J. Cremaldi, L.M. Kroeger, R. Perera, L. Rahmat, R. Sanders, D.A. Avdeeva, E. Bloom, K. Bose, S. Butt, J. Claes, D.R. Dominguez, A. Eads, M. Keller, J. Kravchenko, I. Lazo-Flores, J. Malbouisson, H. Malik, S. Snow, G.R. Baur, U. Godshalk, A. Iashvili, I. Jain, S. Kharchilava, A. Kumar, A. Shipkowski, S.P. Smith, K. Alverson, G. Barberis, E. Baumgartel, D. Chasco, M. Haley, J. Nash, D. Trocino, D. Wood, D. Zhang, J. Anastassov, A. Kubik, A. Mucia, N. Odell, N. Ofierzynski, R.A. Pollack, B. Pozdnyakov, A. Schmitt, M. Stoynev, S. Velasco, M. Won, S. Antonelli, L. Berry, D. Brinkerhoff, A. Hildreth, M. Jessop, C. Karmgard, D.J. Kolb, J. Lannon, K. Luo, W. Lynch, S. Marinelli, N. Morse, D.M. Pearson, T. Ruchti, R. Slaunwhite, J. Valls, N. Wayne, M. Wolf, M. Bylsma, B. Durkin, L.S. Hill, C. Hughes, R. Kotov, K. Ling, T.Y. Puigh, D. Rodenburg, M. Vuosalo, C. Williams, G. Winer, B.L. Adam, N. Berry, E. Elmer, P. Gerbaudo, D. Halyo, V. Hebda, P. Hegeman, J. Hunt, A. Jindal, P. Lopes Pegna, D. Lujan, P. Marlow, D. Medvedeva, T. Mooney, M. Olsen, J. Piroué, P. Quan, X. Raval, A. Safdi, B. Saka, H. Stickland, D. Tully, C. Werner, J.S. Zuranski, A. Acosta, J.G. Brownson, E. Huang, X.T. Lopez, A. Mendez, H. Oliveros, S. Ramirez Vargas, J.E. Zatserklyaniy, A. Alagoz, E. Barnes, V.E. Benedetti, D. Bolla, G. Bortoletto, D. De Mattia, M. Everett, A. Hu, Z. Jones, M. Koybasi, O. Kress, M. Laasanen, A.T. Leonardo, N. Maroussov, V. Merkel, P. Miller, D.H. Neumeister, N. Shipsey, I. Silvers, D. Svyatkovskiy, A. Vidal Marono, M. Yoo, H.D. Zablocki, J. Zheng, Y. Guragain, S. Parashar, N. Adair, A. Boulahouache, C. Ecklund, K.M. Geurts, F.J.M. Padley, B.P. Redjimi, R. Roberts, J. Zabel, J. Betchart, B. Bodek, A. Chung, Y.S. Covarelli, R. de Barbaro, P. Demina, R. Eshaq, Y. Garcia-Bellido, A. Goldenzweig, P. Han, J. Harel, A. Miner, D.C. Vishnevskiy, D. Zielinski, M. Bhatti, A. Ciesielski, R. Demortier, L. Goulianos, K. Lungu, G. Malik, S. Mesropian, C. Arora, S. Barker, A. Chou, J.P. Contreras-Campana, C. Contreras-Campana, E. Duggan, D. Ferencek, D. Gershtein, Y. Gray, R. Halkiadakis, E. Hidas, D. Lath, A. Panwalkar, S. Park, M. Patel, R. Rekovic, V. Robles, J. Rose, K. Salur, S. Schnetzer, S. Seitz, C. Somalwar, S. Stone, R. Thomas, S. Cerizza, G. Hollingsworth, M. Spanier, S. Yang, Z.C. York, A. Eusebi, R. Flanagan, W. Gilmore, J. Kamon, T. Khotilovich, V. Montalvo, R. Osipenkov, I. Pakhotin, Y. Perloff, A. Roe, J. Safonov, A. Sakuma, T. Sengupta, S. Suarez, I. Tatarinov, A. Toback, D. Akchurin, N. Damgov, J. Dudero, P.R. Jeong, C. Kovitanggoon, K. Lee, S.W. Libeiro, T. Roh, Y. Volobouev, I. Appelt, E. Delannoy, A.G. Florez, C. Greene, S. Gurrola, A. Johns, W. Johnston, C. Kurt, P. Maguire, C. Melo, A. Sharma, M. Sheldon, P. Snook, B. Tuo, S. Velkovska, J. Arenton, M.W. Balazs, M. Boutle, S. Cox, B. Francis, B. Goodell, J. Hirosky, R. Ledovskoy, A. Lin, C. Neu, C. Wood, J. Yohay, R. Gollapinni, S. Harr, R. Karchin, P.E. Kottachchi Kankanamge Don, C. Lamichhane, P. Sakharov, A. Anderson, M. Bachtis, M. Belknap, D. Borrello, L. Carlsmith, D. Cepeda, M. Dasu, S. Gray, L. Grogg, K.S. Grothe, M. Hall-Wilton, R. Herndon, M. Hervé, A. Klabbers, P. Klukas, J. Lanaro, A. Lazaridis, C. Leonard, J. Loveless, R. Mohapatra, A. Ojalvo, I. Palmonari, F. Pierro, G.A. Ross, I. Savin, A. Smith, W.H. Swanson, J.

Subjects
High Energy Physics::Experiment
Abstract

The tt- charge asymmetry is measured in events containing a charged lepton (electron or muon) and at least four jets, one of which is identified as originating from b-quark hadronization. The analyzed dataset corresponds to an integrated luminosity of 5.0 fb -1 collected with the CMS detector at the LHC. An inclusive and three differential measurements of the tt- charge asymmetry as a function of rapidity, transverse momentum, and invariant mass of the tt- system are presented. The measured inclusive tt- charge asymmetry is A C=0.004±0.010(stat.)±0.011(syst.). This result and the three differential measurements are consistent with zero asymmetry as well as with the predictions of the standard model. © 2012 CERN.

Published
2012

28. Influence of lattice relaxation on the electron-spin motion in ferromagnetic films: experiment and theory

Author

J. Henk, P. Dey, Mebarek Alouani, Wolfgang Weber, Laurent Joly, F. Scheurer, Hervé Bulou, Ali Hallal, A. Bourzami, L. Tati Bismaths, and T. Berdot

Subjects
Physics, Condensed Matter::Materials Science, Ferromagnetism, Condensed matter physics, Lattice (order), Monolayer, Electron intensity, Electron, Spin (physics), Electronic band structure, Precession angle
Abstract

Fe films grown on Ag(001) as well as MgO films on Fe(001) have been studied by spin-polarized electron reflection experiments. The three central observations are: 1) Oscillations with monolayer periodicity of the electron-spin motion angles e and Φ are observed as a function of the Fe thickness. They are attributed to the oscillatory behavior of the surface-lattice strain that is relaxed at island edges of the incompletely filled top Fe layer. 2) For strongly relaxed thick Fe films a giant spin precession angle of 180o, which is accompanied by a pronounced minimum in the reflected electron intensity, is observed for an electron energy of 7.3 eV. 3) For the interface system MgO/Fe(001) a very strong sensitivity of the spin motion angles on the MgO coverage is observed for certain energy ranges. Ab-initio band structure and spin-dependent electron reflection calculations reveal that lattice relaxations during growth of Fe on Ag(001) as well as MgO on Fe(001) are responsible for the strong changes of the electron-spin motion angles.

Published
2011

29. Ultimate Limit of Electron-Spin Precession upon Reflection in Ferromagnetic Films

Author

L. Tati Bismaths, T. Berdot, Hervé Bulou, Ali Hallal, Mebarek Alouani, Puja Dey, Laurent Joly, Wolfgang Weber, F. Scheurer, Juergen Henk, and A. Bourzami

Subjects
Materials science, Condensed matter physics, Relaxation (NMR), Aucun, General Physics and Astronomy, Condensed Matter::Materials Science, Single electron, Reflection (mathematics), Ferromagnetism, Ab initio quantum chemistry methods, Physics::Space Physics, Precession, Condensed Matter::Strongly Correlated Electrons, Spin (physics), Precession angle
Abstract

We report the discovery of 180 degrees electron-spin precession in spin-polarized electron-reflection experiments on Fe films on Ag(001), the largest possible precession angle in a single electron reflection. Both experiments as a function of Fe film thickness and ab initio calculations show that the appearance of this ultimate spin precession depends with utmost sensitivity on the relaxation of the Fe surface layers during growth. Similar spin precession is also predicted for other ferromagnetic films.

Published
2011

30. Interplay between interfacial and structural properties on the magnetism of self-organized core-shell Co/Pt supported nanodots

Author

N. Moreau, F. Scheurer, S. Rousset, Christine Goyhenex, Paolo Campiglio, Hervé Bulou, Philippe Ohresser, Jérôme Lagoute, V. Repain, J. Klein, Hélène Magnan, Emiliano Fonda, C. Chacon, Yann Girard, Knoop, Martina, Laboratoire d'Etude du Rayonnement et de la Matière en Astrophysique (LERMA), École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université de Cergy Pontoise (UCP), Université Paris-Seine-Université Paris-Seine-Centre National de la Recherche Scientifique (CNRS), Laboratoire Matériaux et Phénomènes Quantiques (MPQ (UMR_7162)), Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), Département Mécanismes d'Accidents (INRETS/MA), Institut National de Recherche sur les Transports et leur Sécurité (INRETS), University of Minnesota [Twin Cities] (UMN), University of Minnesota System, Institut de Physique et Chimie des Matériaux de Strasbourg (IPCMS), Université Louis Pasteur - Strasbourg I-Centre National de la Recherche Scientifique (CNRS), Synchrotron SOLEIL (SSOLEIL), Centre National de la Recherche Scientifique (CNRS), École normale supérieure - Paris (ENS-PSL), École normale supérieure - Paris (ENS Paris)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, PSL Research University (PSL)-PSL Research University (PSL)-Université de Cergy Pontoise (UCP), and University of Minnesota [Twin Cities]

Subjects
[PHYS]Physics [physics], Materials science, Kerr effect, Condensed matter physics, Magnetic moment, Magnetic circular dichroism, Magnetism, 02 engineering and technology, 021001 nanoscience & nanotechnology, Condensed Matter Physics, 01 natural sciences, Electronic, Optical and Magnetic Materials, law.invention, [PHYS] Physics [physics], Hysteresis, Magnetic anisotropy, law, 0103 physical sciences, Nanodot, Scanning tunneling microscope, 010306 general physics, 0210 nano-technology
Abstract

International audience; We have studied the influence of Pt capping on the magnetic properties of self-organized Co nanodots by means of complementary structural and magnetic investigation techniques. The growth of monodisperse 5 nm diameter Co dots on a Au(111) surface and its progressive coverage by Pt were performed under ultrahigh vacuum conditions and imaged by scanning tunneling microscopy, revealing a weak mixing at room temperature. The Co/Pt core-shell structure was studied both by molecular-dynamics simulations and surface extended x-ray-absorption fine structure, showing a global dilatation of the Co core. Both magnetic moments and hysteresis cycles at various temperatures were measured using x-ray magnetic circular dichroism, revealing a slight increase of the magnetic moments and the out-of-plane magnetic anisotropy after Pt capping. Moreover, the variation of magnetic anisotropy as a function of capping was followed in situ by the magneto-optical Kerr effect. Our investigations demonstrate that interfacial hybridization between Co and Pt is dominant over magnetoelastic contribution in this system.

Published
2011

31. LEED analysis of ultra-thin cobalt layers grown on Cr(100)

Author

B. Carrière, Philippe Ohresser, R. Baudoing-Savois, F. Scheurer, J.P. Deville, and Y. Gauthier

Subjects
Low-energy electron diffraction, Analytical chemistry, chemistry.chemical_element, Crystal growth, Surfaces and Interfaces, Condensed Matter Physics, Nitrogen, Surfaces, Coatings and Films, Chromium, Crystallography, chemistry, Metastability, Phase (matter), Materials Chemistry, Thin film, Cobalt
Abstract

Cobalt overlayers grown at room temperature on a chromium (100) surface have been studied with low energy electron diffraction (LEED) up to a thickness of four atomic layers. A quantitative analysis via dynamical LEED calculations is given for zero and two cobalt layers grown on Cr(100). A metastable bcc phase of cobalt is evidenced. The influence of nitrogen contamination of the films is discussed.

Published
1993

32. Cobalt ultra-thin film epitaxy on Pt(100) surfaces

Author

R. Cousandier, F. Scheurer, C. Boeglin, B. Carrière, C. Speisser, J.P. Deville, and Antoine Barbier

Subjects
Surface science, Reflection high-energy electron diffraction, Materials science, Annealing (metallurgy), Analytical chemistry, chemistry.chemical_element, Surfaces and Interfaces, Atmospheric temperature range, Epitaxy, Condensed Matter Physics, Surfaces, Coatings and Films, Crystallography, chemistry, Materials Chemistry, Thin film, Platinum, Cobalt
Abstract

To test the possibility of obtaining good Co-Pt multilayers, we studied the initial stages of growth of Co on Pt(100) by surface physics techniques in order to determine the structural order of ultra-thin Co layers. The LEED-Auger data for room temperature deposition can be explained by a quasi layer-by-layer growth showing a large surface disorder. Photoemission experiments using the synchrotron radiation in the 40–130 eV range confirmed that the interface is not really abrupt and evidenced a limited interdiffusion process below the cobalt overlayers. Annealing these cobalt ultra-thin films (2–10 ML) in the 200–400 °C range gave rise to a progressive epitaxy of a cubic phase on platinum, clearly identified by LEED and RHEED. This showed the possibility of building in this temperature range an interface structurally better defined than at room temperature.

Published
1991

33. Growth and electronic structure as studied by photoemission of the Fe/Cr(100) interface

Author

O. Heckmann, F. Scheurer, J.P. Deville, Eric Beaurepaire, B. Carrière, and V. Schorsch

Subjects
Valence (chemistry), Materials science, Condensed matter physics, Magnetic moment, X-ray photoelectron spectroscopy, Monolayer, Materials Chemistry, Angle-resolved photoemission spectroscopy, Surfaces and Interfaces, Electronic structure, Condensed Matter Physics, Ground state, Surfaces, Coatings and Films
Abstract

The valence bands and core levels of ultrathin Fe layers deposited on a Cr(100) surface at room temperature are studied by ARPES, UPS and XPS. Transitions from Fe minority and majority spin bands are still observed for coverages of about 1 monolayer, showing that Fe retains its magnetic ground state; the persistence of the magnetic satellite in the Fe 3s core levels also supports this conclusion. These studies agree with theoretical calculations which predict an enhanced magnetic moment for ultrathin Fe layers on Cr(100).

Published
1991

34. Evidence of epitaxial growth of bcc Co on Cr(100)

Author

J.P. Deville, Eric Beaurepaire, F. Scheurer, and B. Carrière

Subjects
chemistry.chemical_element, Crystal growth, Surfaces and Interfaces, Epitaxy, Condensed Matter Physics, Auger, Surfaces, Coatings and Films, Crystallography, Chromium, chemistry, Phase (matter), Monolayer, Materials Chemistry, Thin film, Cobalt
Abstract

We report a LEED/Auger study of the growth of cobalt ultra-thin films on Cr(100) surfaces. We demonstrate that Co can be grown epitaxially at room temperature, probably in a metastable bcc phase on this chromium surface. A 1 × 1 LEED pattern is observed at least up to 20 cobalt monolayers. The Auger data are consistent with an abrupt interface and a layer-by-layer growth mode.

Published
1991

35. Growth and electronic structure as studied by photoemission of Fe/Cr and Co/Cr interfaces

Author

B. Carrière, F. Scheurer, V. Schorsch, Eric Beaurepaire, Christine Boeglin, J.P. Deville, and O. Heckmann

Subjects
Valence (chemistry), Materials science, Ferromagnetism, Condensed matter physics, Magnetic moment, Monolayer, Angle-resolved photoemission spectroscopy, Electronic structure, Condensed Matter Physics, Electronic, Optical and Magnetic Materials
Abstract

The valence bands of ultrathin Fe and Co layers deposited on a Cr(100) surface at room temperature are studied by ARPES and UPS. Transitions from Fe minority and majority spin bands are still observed for coverages of about 1 monolayer, showing that Fe remains ferromagnetic. These studies agree with theoretical calculations which predict an enhanced magnetic moment for ultrathin Fe layers on Cr(100). Measurements on Co layers let us suppose that a Stranski-Krastanov growth mode occurs, with a bcc Co phase for the very first layers.

Published
1991

36. Evidence of epitaxial cobalt on platinum (100) surfaces

Author

F. Scheurer, J.P. Deville, Christine Boeglin, B. Carrière, and Antoine Barbier

Subjects
Surface science, Materials science, Reflection high-energy electron diffraction, Condensed matter physics, Magnetism, Annealing (metallurgy), chemistry.chemical_element, Atmospheric temperature range, Condensed Matter Physics, Epitaxy, Electronic, Optical and Magnetic Materials, Overlayer, Nuclear magnetic resonance, chemistry, Cobalt
Abstract

The investigation of the initial stages of growth of cobalt on Pt(100) has been undertaken to test the possibilities of obtaining modulated metallic magnetic multilayers having new interesting magnetic properties. Using surface physics methods like LEED, Auger and photoemission (synchrotron radiation), we established the growth mode to find that at room temperature no epitaxy occurs between the layers even if the growth is homogeneous. As far as magnetism is concerned, we evidenced an induced magnetic Pt state at the interface. Annealing the cobalt films in the temperature range 200–410°C leads to order the interface and bring up fcc LEED and RHEED patterns related to an epitaxial alloy overlayer.

Published
1991

37. Morphology- and quantum-size induced oscillations of the electron-spin precession in Fe films on Ag(001)

Author

Loïc Joly, F. Scheurer, Wolfgang Weber, L. Tati-Bismaths, and A. Bourzami

Subjects
Physics, Condensed Matter::Materials Science, Angular momentum, Condensed matter physics, Spin polarization, Ferromagnetism, Total angular momentum quantum number, Monolayer, Quantum oscillations, Electron, Polarization (waves)
Abstract

We report on spin-polarized electron reflection experiments on Fe films on Ag(001). Upon reflecting from the Fe film the electron-spin polarization is found to vary in an oscillatory fashion as a function of the Fe thickness. Two different periods are identified. While the long period is related to the occurrence of quantum-size effects in the Fe layer, the short period of one monolayer is attributed to the periodic variations of the film morphology alternating between filled and incompletely filled atomic layers. This shows - because of total angular momentum conservation - that the transfer of spin-angular momentum from the incident electrons to the ferromagnetic film can be extremely sensitive to the morphology and structure of the film.

Published
2008

38. Morphology-induced oscillations of the electron-spin precession in Fe films onAg(001)

Author

L. Tati Bismaths, Wolfgang Weber, A. Bourzami, Loïc Joly, and F. Scheurer

Subjects
Larmor precession, Hydrogen-like atom, Materials science, Morphology (linguistics), Magnetic moment, Spin polarization, Condensed matter physics, Precession, Condensed Matter Physics, Spin quantum number, Quantum well, Electronic, Optical and Magnetic Materials
Published
2008

40. Magnetic properties of coupled ultrathinNiO∕Fe3O4(001) films

Author

B. Carvello, Christine Boeglin, F. Scheurer, B. Muller, M. Pilard, Salia Cherifi, Lucian Roiban, Ovidiu Ersen, and Laurent Ranno

Subjects
Physics, Condensed Matter::Materials Science, Magnetic anisotropy, Magnetization, Octahedron, Magnetic moment, Condensed matter physics, Order (ring theory), Antiferromagnetism, Condensed Matter Physics, Magnetocrystalline anisotropy, Electronic, Optical and Magnetic Materials, Spin magnetic moment
Abstract

A strong reduction in the magnetic spin and orbital moments as well as large magnetocrystalline anisotropies are observed in ultrathin $\mathrm{Ni}\mathrm{O}∕{\mathrm{Fe}}_{3}{\mathrm{O}}_{4}$ (001) films compared to ${\mathrm{Fe}}_{3}{\mathrm{O}}_{4}$ (001). Combining x-ray absorption spectroscopy, x-ray magnetic circular and linear dichroism (XMCD-XMLD), and high-resolution transmission electron microscopy (HRTEM) the magnetic anisotropy of ultrathin $\mathrm{Ni}\mathrm{O}∕{\mathrm{Fe}}_{3}{\mathrm{O}}_{4}$ (001) films was studied and compared to structural anisotropy at the interface. The evolution of the XMCD signal at the Fe octahedral sites allows a quantitative description of the interface. A simple model is proposed where uncompensated spins are located in a $1.5\text{\ensuremath{-}}\mathrm{nm}$-thick interfacial $\mathrm{Ni}{\mathrm{Fe}}_{2}{\mathrm{O}}_{4}$ compound. Angular-dependent measurements of the effective spin and orbital magnetic moments at the Fe ${L}_{2,3}$ edges reveal the presence of a large magnetocrystalline anisotropy, appearing for a particular growth temperature of the films. The magnetocrystalline anisotropy measured at the Fe ${L}_{2,3}$ edges is attributed to the specific anisotropic structure developed at the interface and to crystalline ordering of a strained compound. HRTEM confirms the presence of an ordered anisotropic structure at the $\mathrm{Ni}\mathrm{O}∕{\mathrm{Fe}}_{3}{\mathrm{O}}_{4}$ (001) interface. The in-plane strained NiO(001) films promote antiferromagnetic order where the spins are oriented parallel to the ⟨100⟩ in-plane direction, collinear to the magnetization direction in the ${\mathrm{Fe}}_{3}{\mathrm{O}}_{4}$ (001) substrate.

Published
2007

41. Quantum-well state induced oscillations of the electron-spin motion in Au films on Co(001)

Author

F. Scheurer, Wolfgang Weber, L. Tati Bismaths, and Laurent Joly

Subjects
Physics, Interferometry, Reflection (mathematics), Spin polarization, Condensed matter physics, Motion (geometry), Condensed Matter::Strongly Correlated Electrons, Electron, Condensed Matter Physics, Inelastic mean free path, Quantum well, Electronic, Optical and Magnetic Materials, Overlayer
Abstract

We report on spin-polarized electron reflection experiments in which the electron-spin motion is studied in spin-dependent quantum-well structures. Quantum-well state induced oscillations of both the electron reflectivity and the electron-spin motion are observed in the system $\mathrm{Au}∕\mathrm{Co}(001)$ as a function of the Au overlayer thickness. A Fabry-P\'erot interferometer model can explain the main features of the experimental data. We discuss the influence of the spin-dependent reflectivity, the inelastic mean free path, the diffusively scattered electron intensity contribution, and the growth mode on the behavior of the electron-spin motion within the interferometer model.

Published
2007

42. Paramagnetism of the Co sublattice in ferromagneticZn1−xCoxOfilms

Author

Silviu Colis, Frithjof Nolting, Andrei Rogalev, Fabrice Wilhelm, Dominique Muller, Guy Schmerber, Jean-Paul Kappler, Aziz Dinia, F. Scheurer, H. Bieber, Paolo Imperia, Alessandro Barla, J.J. Grob, and Eric Beaurepaire

Subjects
Condensed Matter::Materials Science, Magnetization, Paramagnetism, Curie–Weiss law, Materials science, Condensed matter physics, Magnetic moment, X-ray magnetic circular dichroism, Curie temperature, Magnetic semiconductor, Absorption (logic), Condensed Matter Physics, Electronic, Optical and Magnetic Materials
Abstract

Using the spectroscopies based on x-ray absorption, we have studied the structural and magnetic properties of ${\mathrm{Zn}}_{1\ensuremath{-}x}{\mathrm{Co}}_{x}\mathrm{O}$ films ($x=0.1$ and 0.25) produced by reactive magnetron sputtering. These films show ferromagnetism with a Curie temperature ${T}_{C}$ above room temperature in bulk magnetization measurements. Our results show that the Co atoms are in a divalent state and in tetrahedral coordination, thus substituting Zn in the wurtzite-type structure of ZnO. However, x-ray magnetic circular dichroism at the $\mathrm{Co}\phantom{\rule{0.2em}{0ex}}{L}_{2,3}$ edges reveals that the $\mathrm{Co}\phantom{\rule{0.2em}{0ex}}3d$ sublattice is paramagnetic at all temperatures down to $2\phantom{\rule{0.3em}{0ex}}\mathrm{K}$, both at the surface and in the bulk of the films. The $\mathrm{Co}\phantom{\rule{0.2em}{0ex}}3d$ magnetic moment at room temperature is considerably smaller than that inferred from bulk magnetization measurements, suggesting that the $\mathrm{Co}\phantom{\rule{0.2em}{0ex}}3d$ electrons are not directly at the origin of the observed ferromagnetism.

Published
2007

43. Influence of Cr capping on the magnetic properties of epitaxial Co on Pd(111)

Author

S. Boukari, B. Carrière, F. Scheurer, Eric Beaurepaire, and J.P. Deville

Subjects
Auger electron spectroscopy, Materials science, Condensed matter physics, Metals and Alloys, Surfaces and Interfaces, Coercivity, Surfaces, Coatings and Films, Electronic, Optical and Magnetic Materials, Condensed Matter::Materials Science, Magnetization, Ferromagnetism, Electron diffraction, Remanence, Condensed Matter::Superconductivity, Monolayer, Materials Chemistry, Thin film
Abstract

The influence of Cr deposition on the magnetic properties of epitaxial Co films grown on a Pd(111) single-crystal is analyzed by in situ magneto–optical Kerr effect measurements. Auger electron spectroscopy and low-energy electron diffraction are used for monitoring the growth and structure of the films. Co films thicker than 0.5 monolayer (ML) exhibit a ferromagnetic order at room temperature. In the case of uncovered Co films grown on Pd(111), the easy magnetization axis is found to be perpendicular for thicknesses between 1.1 and 2 ML, and in plane above. Covering thin Co films with Cr layers produces a non-monotonous variation of the coercive field and normalized remanence, and a reorientation of the easy magnetization axis from in plane to out of plane.

Published
1998

44. Distribution of the magnetic anisotropy energy of an array of self-ordered Co nanodots deposited on vicinalAu(111): X-ray magnetic circular dichroism measurements and theory

Author

Vincent Repain, Stanislas Rohart, F. Scheurer, Peter Bencok, Sylvie Rousset, Philippe Ohresser, Antonio Tejeda, and Jacques Ferré

Subjects
Physics, Condensed matter physics, Magnetic circular dichroism, 02 engineering and technology, 021001 nanoscience & nanotechnology, Condensed Matter Physics, 01 natural sciences, Magnetic susceptibility, Electronic, Optical and Magnetic Materials, Paramagnetism, Full width at half maximum, Magnetic anisotropy, X-ray magnetic circular dichroism, 0103 physical sciences, Nanodot, 010306 general physics, 0210 nano-technology, Vicinal
Abstract

The magnetic anisotropy energy (MAE) of a self-assembled Co nanodot array on a Au vicinal surface is studied by x-ray magnetic circular dichroism. The mean dot diameter is $2\phantom{\rule{0.3em}{0ex}}\mathrm{nm}$, i.e., 120 atoms, and each dot is aligned on a $3.8\ifmmode\times\else\texttimes\fi{}7.2\phantom{\rule{0.3em}{0ex}}{\mathrm{nm}}^{2}$ lattice. The hysteresis cycles have been determined for various temperatures below and above the blocking temperature. The cycles are well fitted by a rate equation model based on the Stoner-Wohlfarth Hamiltonian. Dynamical hysteresis cycles are calculated with this model for various MAE distributions. It is shown that the blocking temperature indicates the highest MAE in the assembly and that the coercive field indicates the mean MAE. In our self-ordered sample, we find a mean MAE of $26\phantom{\rule{0.3em}{0ex}}\mathrm{meV}$ per dot and a full width at half maximum of $53\phantom{\rule{0.3em}{0ex}}\mathrm{meV}$. The determination of experimental distributions from cycles published in the literature generally shows negligible interactions among dots and a MAE distribution broader than the size distribution. The latter is interpreted in terms of atomic relaxations inside the Co dots.

Published
2006

45. Uniform Magnetic Properties for an Ultrahigh-Density Lattice of Noninteracting Co Nanostructures

Author

M. Epple, Philippe Ohresser, F. Scheurer, Antonio Tejeda, Stefano Rusponi, Stanislas Rohart, Tristan Cren, G. Baudot, Peter Bencok, Sylvie Rousset, Harald Brune, Nicolas Weiss, Vincent Repain, Inst Phys Nanostruct, Laboratoire Matériaux et Phénomènes Quantiques (MPQ (UMR_7162)), Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), Laboratoire pour l'utilisation du rayonnement électromagnétique (LURE), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-MENRT-Centre National de la Recherche Scientifique (CNRS), Institut de Physique et Chimie des Matériaux de Strasbourg (IPCMS), Université Louis Pasteur - Strasbourg I-Centre National de la Recherche Scientifique (CNRS), and European Synchrotron Radiation Facility (ESRF)

Subjects
Nanostructure, Materials science, Magnetism of Nanostructures, General Physics and Astronomy, Nanoparticle, 02 engineering and technology, 01 natural sciences, law.invention, ORBITAL MAGNETIZATION, law, 0103 physical sciences, NANOPARTICLES, 010306 general physics, Anisotropy, AU(111), MICROSCOPIC ORIGIN, ANISOTROPY, Condensed matter physics, AY CIRCULAR-DICHROISM, NANOCRYSTAL SUPERLATTICES, ORDERED GROWTH, 021001 nanoscience & nanotechnology, Magnetic susceptibility, Magnetic anisotropy, COBALT NANOSTRUCTURES, [PHYS.COND.CM-SCE]Physics [physics]/Condensed Matter [cond-mat]/Strongly Correlated Electrons [cond-mat.str-el], Scanning tunneling microscope, CLUSTERS, 0210 nano-technology, Tera, Orbital magnetization
Abstract

International audience; We report on the magnetic properties of two-dimensional Co nanoparticles arranged in macroscopically phase-coherent superlattices created by self-assembly on Au(788). Our particles have a density of 26 Tera/in(2) (1 Tera=10(12)), are monodomain, and have uniaxial out-of-plane anisotropy. The distribution of the magnetic anisotropy energies has a half width at half maximum of 17%, a factor of 2 more narrow than the best results reported for superlattices of three-dimensional nanoparticles. Our data show the absence of magnetic interactions between the particles. Co/Au(788) thus constitutes an ideal model system to explore the ultimate density limit of magnetic recording.

Published
2005

46. Variable Temperature UHV-Stm and Kerr Measurements of Co on Au

Author

P. Bucher, F. Scheurer, S. Padovani, and P. Molinas

Subjects
Paramagnetism, Magnetic anisotropy, Materials science, Exchange bias, Magnetoresistance, Condensed matter physics, Magnetic domain, Analytical chemistry, Magnetic force microscope, Saturation (magnetic), Magnetic susceptibility
Published
2005

47. Surface Diffusion of Cr Adatoms on Au(111) by Quantum Tunneling

Author

Emilie Gaudry, Hervé Bulou, I. Chado, J. Faerber, Philippe Ohresser, F. Scheurer, Christine Boeglin, Sarnjeet S. Dhesi, B. Lazarovits, Synchrotron SOLEIL (SSOLEIL), Centre National de la Recherche Scientifique (CNRS), Institut de Physique et Chimie des Matériaux de Strasbourg (IPCMS), Université Louis Pasteur - Strasbourg I-Centre National de la Recherche Scientifique (CNRS), European Synchrotron Radiation Facility (ESRF), Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS)-Matériaux et nanosciences d'Alsace, Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS)-Réseau nanophotonique et optique, Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA), Center for Computational Materials Science [Wien], Technical University of Vienna [Vienna] (TU WIEN), Institut de minéralogie et de physique des milieux condensés (IMPMC), Université Pierre et Marie Curie - Paris 6 (UPMC)-IPG PARIS-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), Physikalisches Institut [Würzburg], Julius-Maximilians-Universität Würzburg [Wurtzbourg, Allemagne] (JMU), Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS)-Matériaux et Nanosciences Grand-Est (MNGE), Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de la Santé et de la Recherche Médicale (INSERM)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de la Santé et de la Recherche Médicale (INSERM)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Réseau nanophotonique et optique, Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS), Vienna University of Technology (TU Wien), Université Pierre et Marie Curie - Paris 6 (UPMC)-Université Paris Diderot - Paris 7 (UPD7)-Institut de Physique du Globe de Paris (IPG Paris)-Centre National de la Recherche Scientifique (CNRS), Julius-Maximilians-Universität Würzburg (JMU), Université de Strasbourg (UNISTRA)-Matériaux et nanosciences d'Alsace (FMNGE), Institut de Chimie du CNRS (INC)-Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)-Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS)-Réseau nanophotonique et optique, Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA), Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS)-Matériaux et nanosciences d'Alsace (FMNGE), and Institut de Chimie du CNRS (INC)-Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)-Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS)-Réseau nanophotonique et optique

Subjects
Surface diffusion, Materials science, Condensed matter physics, Magnetic circular dichroism, Monte Carlo method, Nucleation, General Physics and Astronomy, 02 engineering and technology, 021001 nanoscience & nanotechnology, 01 natural sciences, Spectral line shape, 0103 physical sciences, [PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci], Orders of magnitude (data), Diffusion (business), 010306 general physics, 0210 nano-technology, Quantum tunnelling
Abstract

International audience; The low-temperature surface diffusion of isolated Cr adatoms on Au(111) has been determined using nonperturbing x rays. Changes in the x-ray magnetic circular dichroism spectral line shape together with Monte Carlo calculations demonstrate that adatom nucleation proceeds via quantum tunneling diffusion rather than over-barrier hopping for temperatures

Published
2005

48. Growth, morphology and annealing of thin Co layers on

Author

T. Detzel, F. Scheurer, Jean-Pierre Bucher, and T.H. Gentner

Subjects
Auger electron spectroscopy, Annealing (metallurgy), Bilayer, Metals and Alloys, Nucleation, chemistry.chemical_element, Surfaces and Interfaces, Surfaces, Coatings and Films, Electronic, Optical and Magnetic Materials, Crystallography, chemistry, Materials Chemistry, Mica, Dislocation, Thin film, Cobalt
Abstract

The growth of Co on Au mica has been studied by means of variable temperature scanning tunnelling microscopy and Auger electron spectroscopy. Growth at 300 K (low Co coverage), produces mono- and bilayer islands of about 5 nm in diameter. Rough Co layers are obtained upon further deposition of Co. Direct growth at 430 K leads to much larger and higher Co islands. Their surface density is no longer dictated by the nucleation at the dislocation of the √3 × 22 reconstruction of the Au(111) surface but rather by the growth kinetics of diffusing Co atoms. Annealing at 500 K of films grown at 300 K leads to significant surface smoothing possibly induced by migration of Au on top of the Co film.

Published
1996

49. Structure of self-organized Fe clusters grown on Au(111) analyzed by Grazing Incidence X-Ray Diffraction

Author

F. Scheurer, Hervé Bulou, Stefan Stanescu, C Quiros, Antoine Barbier, and Philippe Ohresser

Subjects
Diffraction, Condensed Matter - Materials Science, Materials science, business.industry, Materials Science (cond-mat.mtrl-sci), FOS: Physical sciences, Crystal growth, Crystal structure, Condensed Matter Physics, Epitaxy, Electronic, Optical and Magnetic Materials, Crystallography, Optics, Transition metal, X-ray crystallography, Monolayer, Thin film, business
Abstract

We report a detailed investigation of the first stages of the growth of self-organized Fe clusters on the reconstructed Au(111) surface by grazing incidence X-ray diffraction. Below one monolayer coverage, the Fe clusters are in "local epitaxy" whereas the subsequent layers adopt first a strained fcc lattice and then a partly relaxed bcc(110) phase in a Kurdjumov-Sachs epitaxial relationship. The structural evolution is discussed in relation with the magnetic properties of the Fe clusters., 7 pages, 6 figures, submitted to Physical Review B September 2003

Published
2003

50. X-ray super-cell crystallography of self-organized Co/Au(111) deposits

Author

J.P. Deville, Olivier Fruchart, Jeannot Mane-Mane, M. Noblet, F. Scheurer, Gilles Renaud, O. Ulrich, Sylvie Rousset, Antoine Barbier, Vincent Repain, G. Baudot, Laboratoire Louis Néel (LLN), Centre National de la Recherche Scientifique (CNRS), Service de Physique des Matériaux et Microstructures (SP2M - UMR 9002), Institut Nanosciences et Cryogénie (INAC), Université Grenoble Alpes [2016-2019] (UGA [2016-2019])-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019])-Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Service de Physique et de Chimie des Surfaces et Interfaces (SPCSI), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Institut de Physique et Chimie des Matériaux de Strasbourg (IPCMS), Université de Strasbourg (UNISTRA)-Matériaux et nanosciences d'Alsace (FMNGE), Institut de Chimie du CNRS (INC)-Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)-Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS)-Réseau nanophotonique et optique, Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA), Institut des Nanosciences de Paris (INSP), Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019])-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019]), Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS)-Matériaux et Nanosciences Grand-Est (MNGE), Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de la Santé et de la Recherche Médicale (INSERM)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de la Santé et de la Recherche Médicale (INSERM)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Réseau nanophotonique et optique, and Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS)

Subjects
[PHYS]Physics [physics], Materials science, Scattering, Small-angle X-ray scattering, X-ray, General Physics and Astronomy, 02 engineering and technology, Crystal structure, 021001 nanoscience & nanotechnology, Microstructure, 01 natural sciences, Reciprocal lattice, Crystallography, 0103 physical sciences, Grazing-incidence small-angle scattering, Thin film, 010306 general physics, 0210 nano-technology
Abstract

International audience; We report in situ Grazing Incidence Small Angle X-ray Scattering (GISAXS), performed on self-organized Co/Au (111)deposits during growth. The surface reciprocal space associated with the dots periodicity (similar to10 nm) is investigated. The quantitative combination of GISAXS and STM yields non-destructive information about buried layers. For Co/Au(111), a periodic interfacial microstructure persists even after the film free-surface smoothing is observed.

Published
2003

Catalog

Books, media, physical & digital resources
See catalog results