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6 results on '"Laboratory TASC (TASC)"'

1. Biaxial strain in the hexagonal plane of MnAs thin films: The key to stabilize ferromagnetism to higher temperature

Author

F. Maccherozzi, Frédéric Ott, P. Bourges, Massimiliano Marangolo, Victor H. Etgens, Yvan Sidis, Franck Vidal, Mahmoud Eddrief, Vincent Garcia, G. Panaccione, Institut des Nanosciences de Paris (INSP), Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Laboratoire Léon Brillouin (LLB - UMR 12), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS), Laboratory TASC, INFM-CNR, Laboratory TASC (TASC), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Centre National de la Recherche Scientifique (CNRS)-Université Paris-Saclay, TASC - Laboratory TASC, Laboratoire Léon Brillouin ( LLB - UMR 12 ), Commissariat à l'énergie atomique et aux énergies alternatives ( CEA ) -Université Paris-Saclay-Centre National de la Recherche Scientifique ( CNRS ), Laboratory TASC ( TASC ), Institut des Nanosciences de Paris ( INSP ), and Université Pierre et Marie Curie - Paris 6 ( UPMC ) -Centre National de la Recherche Scientifique ( CNRS )

Subjects
Phase transition, Materials science, General Physics and Astronomy, FOS: Physical sciences, 02 engineering and technology, Substrate (electronics), Neutron scattering, 01 natural sciences, Condensed Matter::Materials Science, MAGNETIC-PROPERTIES, Phase (matter), 0103 physical sciences, Thin film, [PHYS.COND]Physics [physics]/Condensed Matter [cond-mat], 010306 general physics, Phase diagram, Condensed Matter - Materials Science, Condensed matter physics, Plane (geometry), GAAS, Materials Science (cond-mat.mtrl-sci), 021001 nanoscience & nanotechnology, Condensed Matter::Mesoscopic Systems and Quantum Hall Effect, Ferromagnetism, 0210 nano-technology, [ PHYS.COND ] Physics [physics]/Condensed Matter [cond-mat]
Abstract

The alpha-beta magneto-structural phase transition in MnAs/GaAs(111) epilayers is investigated by elastic neutron scattering. The in-plane parameter of MnAs remains almost constant with temperature from 100 K to 420 K, following the thermal evolution of the GaAs substrate. This induces a temperature dependent biaxial strain that is responsible for an alpha-beta phase coexistence and, more important, for the stabilization of the ferromagnetic alpha-phase at higher temperature than in bulk. We explain the premature appearance of the beta-phase at 275 K and the persistence of the ferromagnetic alpha-phase up to 350 K with thermodynamical arguments based on the MnAs phase diagram. It results that the biaxial strain in the hexagonal plane is the key parameter to extend the ferromagnetic phase well over room temperature., 4 pages, 3 figures, accepted for publication in Physical Review Letters

Published
2007
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2. Circular dichroism in photoemission as a fingerprint of surface band structure: The case of ZnSe(001)-c(2x2)

Author

Vidal , Franck, Marangolo , M., Torelli , P., Eddrief , M., Mulazzi , M., Panaccione , G., Institut des Nanosciences de Paris (INSP), Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS), CNR Istituto Officina dei Materiali, Consiglio Nazionale delle Ricerche (CNR), Laboratory TASC (TASC), INFM-CNR, National Research Council of Italy | Consiglio Nazionale delle Ricerche (CNR), Institut des Nanosciences de Paris ( INSP ), Université Pierre et Marie Curie - Paris 6 ( UPMC ) -Centre National de la Recherche Scientifique ( CNRS ), CNR, Ist Off Mat, and Laboratory TASC ( TASC )

Subjects
MOLECULES, Condensed Matter::Materials Science, PHOTOELECTRON ANGULAR-DISTRIBUTIONS, OPTICAL-ACTIVITY, Condensed Matter::Strongly Correlated Electrons, [PHYS.COND]Physics [physics]/Condensed Matter [cond-mat], [ PHYS.COND ] Physics [physics]/Condensed Matter [cond-mat], CONTINUOUS ABSORPTION, REGION
Abstract

International audience; Measurements of circular dichroism in the angular dependence (CDAD) of photoemission from core levels and valence bands of the ZnSe(001)-c(2x2) surface are presented. Due to the lowering of the surface symmetry compared to the bulk, the CDAD of surface-related spectral components and of bulk components exhibit different polar variations. We propose a way to identify experimentally surface-related bands in the valence-band photoemission spectra based on these symmetry considerations.

Published
2007
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3. Adsorption of 2-butyne on Si(001) at room temperature: A valence band photoemission study

Author

François Rochet, Jun Fujii, Fabrice Bournel, Giancarlo Panaccione, Jean-Jacques Gallet, Laboratoire de Chimie Physique - Matière et Rayonnement (LCPMR), Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Synchrotron SOLEIL (SSOLEIL), Centre National de la Recherche Scientifique (CNRS), TASC national laboratory, Trieste, Laboratory TASC (TASC), and INFM-CNR

Subjects
Silicon, Photoemission spectroscopy, Dimer, Inverse photoemission spectroscopy, chemistry.chemical_element, Angle-resolved photoemission spectroscopy, Molecular physics, chemistry.chemical_compound, SI(100), Atomic orbital, Physics::Atomic and Molecular Clusters, Materials Chemistry, [CHIM]Chemical Sciences, Molecular orbital, Physics::Chemical Physics, SPECTROSCOPY, SURFACES, Surfaces and Interfaces, Condensed Matter Physics, ETHYLENE, Surfaces, Coatings and Films, STATES, chemistry, Condensed Matter::Strongly Correlated Electrons, Atomic physics, Vicinal
Abstract

We present an angle resolved ultraviolet photoemission spectroscopy study of the adsorption of 2-butyne (CH3-C C-CH3) on Si(001)-2 x 1 at room temperature. We recorded valence band photoemission spectra for two azimuthal positions of a vicinal silicon surface, where all the rows formed by the surface silicon dimers are parallel. The photoemission symmetry selection rules allow the determination of the orientation of the molecular orbitals. The photoemission signal of the HOMO is enhanced when the electric field is parallel to the dimer rows. This showed that the pi orbital left intact after the cyclo-addition reaction of the molecule with one silicon dimer is parallel to the dimer rows. This indicates that each 2-butyne molecule adsorbs on one silicon dimer. In spite of the size of the system and the vicinity of the orbitals, the angle resolved study points out that no dispersion of the electronic bands occurs. Not all the surface dimers are reacted so some disorder still exists on the surface preventing the formation of Bloch states. (c) 2007 Elsevier B.V. All rights reserved.

Published
2007
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4. X-ray analysis of the magnetic influence of oxygen in Pt/Co/AlOx trilayers

Author

Aurelien Manchon, M. Hochstrasser, B. Dieny, G. Panaccione, Clarisse Ducruet, Stéphane Auffret, Stefania Pizzini, B. Rodmacq, Vojtech Uhlir, Jan Vogel, Lucien Lombard, SPINtronique et TEchnologie des Composants (SPINTEC), Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019])-Institut de Recherche Interdisciplinaire de Grenoble (IRIG), Direction de Recherche Fondamentale (CEA) (DRF (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Direction de Recherche Fondamentale (CEA) (DRF (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Micro et NanoMagnétisme (MNM), Institut Néel (NEEL), Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Université Joseph Fourier - Grenoble 1 (UJF), Laboratory for Solid State Physics (ETH Zurich), Eidgenössische Technische Hochschule - Swiss Federal Institute of Technology [Zürich] (ETH Zürich), Laboratory TASC (TASC), INFM-CNR, Micro et NanoMagnétisme (NEEL - MNM), and Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)

Subjects
Materials science, Nanostructure, oxidation, perpendicular magnetic anisotropy, Analytical chemistry, General Physics and Astronomy, chemistry.chemical_element, 02 engineering and technology, 01 natural sciences, Oxygen, PACS: 75.70.Cn, 75.30.Gw, 79.60.Jv, 81.65.Mq, Condensed Matter::Materials Science, X-ray photoelectron spectroscopy, 0103 physical sciences, platinum, 010306 general physics, Spectroscopy, magnetic multilayers, MAGNETOCRYSTALLINE ANISOTROPY, [PHYS.COND.CM-MSQHE]Physics [physics]/Condensed Matter [cond-mat]/Mesoscopic Systems and Quantum Hall Effect [cond-mat.mes-hall], TUNNEL-JUNCTION, X-ray photoelectron spectra, Heterojunction, PERPENDICULAR ANISOTROPY, aluminium compounds, 021001 nanoscience & nanotechnology, ORBITAL-MOMENT, cobalt, Magnetic anisotropy, chemistry, AU MULTILAYERS, [PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci], 0210 nano-technology, Platinum, Cobalt
Abstract

International audience; X-ray spectroscopy measurements have been performed on a series of Pt/Co/AlOx trilayers to investigate the role of Co oxidation in the perpendicular magnetic anisotropy at the Co/AlOx interface. It is observed that varying the degree of oxidation modifies the magnetic properties of the Co layer, inducing a magnetic anisotropy crossover from in plane to out of plane. The microscopic structural properties are analyzed via x-ray photoelectron spectroscopy measurements. It is shown that increasing the oxidation time enhances the amount of interfacial oxide, which may be at the origin of perpendicular magnetic anisotropy.

Published
2008
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5. Temperature-dependent magnetism of Fe thin films on ZnSe(001)

Author

Ezio Puppin, Massimiliano Brenna, Riccardo Bertacco, Franco Ciccacci, M. Eddrieff, Francesco Maccherozzi, Ermanno Pinotti, Matteo Cantoni, Piero Torelli, G. Panaccione, Massimiliano Marangolo, Jun Fujii, Politecnico di Milano [Milan] (POLIMI), Institut des Nanosciences de Paris (INSP), Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS), CNR Istituto Officina dei Materiali, National Research Council of Italy | Consiglio Nazionale delle Ricerche (CNR), TASC - Laboratory TASC, INFM-CNR, TASC national laboratory, Trieste, Laboratory TASC (TASC), INFM and L-NESS, Dipartimento di Fisica del Politecnico di Milano, Istituto Nazionale di Fisica Nucleare (INFN), and Consiglio Nazionale delle Ricerche (CNR)

Subjects
Materials science, Kerr effect, Condensed matter physics, Magnetic circular dichroism, Magnetism, thin film, 02 engineering and technology, Coercivity, Atmospheric temperature range, 021001 nanoscience & nanotechnology, Condensed Matter Physics, superparamagnetism, 01 natural sciences, blocking temperature, Electronic, Optical and Magnetic Materials, Overlayer, Ferromagnetism, ZnSe, 0103 physical sciences, GROWTH, coercivity, [PHYS.COND]Physics [physics]/Condensed Matter [cond-mat], 010306 general physics, 0210 nano-technology, Superparamagnetism
Abstract

Joint European Magnetic Symposia (JEMS 06), San Sebastian, SPAIN, JUN 26-29, 2006; International audience; We present X-ray magnetic circular dichroism (XMCD) and magneto-optical Kerr effect (MOKE) data on the magnetic properties of Fe/ZnSe(0 0 1) thin films at increasing Fe coverage. The magnetic behaviour of the Fe overlayer is superparamagnetic for a coverage up to 6 monolayers whereas, above this threshold, a truly ferromagnetic phase shows up. XMCD and MOKE data show that this behaviour is substantially unchanged in the temperature range 10-300K for all the investigated coverages: these findings imply that the blocking temperature is definitely below 10 K. (C) 2007 Elsevier B.V. All rights reserved.

Published
2007
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6. Photoelectron spectroscopy study of Pb/Ag(111) in the submonolayer range

Author

G. Le Lay, Guy Tréglia, G. Panaccione, J. Dalmas, Hamid Oughaddou, Jean Bernardini, Bernard Aufray, Christophe Girardeaux, Jun Fujii, ISMO, Institut des Sciences Moléculaires d'Orsay (ISMO), Centre National de la Recherche Scientifique (CNRS)-Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS)-Université Paris-Sud - Paris 11 (UP11), Centre Interdisciplinaire de Nanoscience de Marseille (CINaM), Centre National de la Recherche Scientifique (CNRS)-Aix Marseille Université (AMU), Institut des Matériaux, de Microélectronique et des Nanosciences de Provence (IM2NP), Université de Toulon (UTLN)-Centre National de la Recherche Scientifique (CNRS)-Aix Marseille Université (AMU), Laboratoire matériaux et microélectronique de Provence (L2MP), Université Paul Cézanne - Aix-Marseille 3-Université de Provence - Aix-Marseille 1-Université de Toulon (UTLN)-Centre National de la Recherche Scientifique (CNRS), TASC national laboratory, Trieste, Laboratory TASC (TASC), INFM-CNR, Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS)-Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS), Aix Marseille Université (AMU)-Centre National de la Recherche Scientifique (CNRS), Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS), and Aix Marseille Université (AMU)-Université de Toulon (UTLN)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Low-energy electron diffraction, Chemistry, Alloy, Analytical chemistry, Synchrotron radiation, 02 engineering and technology, Surfaces and Interfaces, engineering.material, 021001 nanoscience & nanotechnology, Condensed Matter Physics, 01 natural sciences, Spectral line, Surfaces, Coatings and Films, Overlayer, Crystallography, Vacuum deposition, X-ray photoelectron spectroscopy, 0103 physical sciences, Monolayer, Materials Chemistry, engineering, [PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci], 010306 general physics, 0210 nano-technology, ComputingMilieux_MISCELLANEOUS
Abstract

The vacuum deposition of Pb onto Ag(1 1 1) gives rise to two different surface structures depending on coverage and deposition temperature. At room temperature (RT), low energy electron diffraction (LEED) reveals a sharp ( 3 × 3 ) R 30 ° reconstruction completed at 1/3 Pb monolayer (ML). Beyond, a close-packed Pb(1 1 1) incommensurate overlayer develops. At low temperature (LT, ∼100 K) the incommensurate structure is directly observed whatever the coverage, corresponding to the growth of close-packed two-dimensional Pb(1 1 1) islands. Synchrotron radiation Pb 5d core-level spectra clearly demonstrate that in each surface structure all Pb atoms have essentially a unique, but different, environment. This reflects the surface alloy formation between the two immiscible metals in the ( 3 × 3 ) R 30 ° reconstruction and a clear signature of the de-alloying process at RT beyond 1/3 ML coverage.

Published
2006
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