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Your search keyword '"Institut für Physik [Mainz]"' showing total 11 results
Start Over Author "Institut für Physik [Mainz]" Topic materials science
11 results on '"Institut für Physik [Mainz]"'

1. Enhancing domain wall velocity through interface intermixing in W-CoFeB-MgO films with perpendicular anisotropy

Author

Samridh Jaiswal, Carolyna Hepburn, Dafiné Ravelosona, Gianfranco Durin, Liza Herrera Diez, Mohamed Belmeguenai, Jürgen Langer, Boyu Zhang, Gerhard Jakob, N. Vernier, Xueying Zhang, Wang Lin, Berthold Ocker, Arianna Casiraghi, S. M. Chérif, Mamour Sall, Weisheng Zhao, Tao Xing, Mathias Kläui, Andrei A. Stashkevich, Yves Roussigné, Xiaoxuan Zhao, Beihang University (BUAA), Institut d'électronique fondamentale (IEF), Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS), College of Life Sciences, Huazhong University of Science and Technology [Wuhan] (HUST), Matériaux, Défauts et IRradiations (MADIR), Centre de recherche sur les Ions, les MAtériaux et la Photonique (CIMAP - UMR 6252), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche sur les Matériaux Avancés (IRMA), Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Rouen Normandie (UNIROUEN), Normandie Université (NU)-Institut national des sciences appliquées Rouen Normandie (INSA Rouen Normandie), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Rouen Normandie (UNIROUEN), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)-Université de Caen Normandie (UNICAEN), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS), Institut des Nanosciences de Paris (INSP), Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Laboratoire des Sciences des Procédés et des Matériaux (LSPM), Université Paris 13 (UP13)-Institut Galilée-Université Sorbonne Paris Cité (USPC)-Centre National de la Recherche Scientifique (CNRS), Laboratoire des Propriétés Mécaniques et Thermodynamiques des Matériaux (LPMTM), Université Paris 13 (UP13)-Institut Galilée-Centre National de la Recherche Scientifique (CNRS), Singulus technology AG, Institut für Physik [Mainz], Johannes Gutenberg - Universität Mainz = Johannes Gutenberg University (JGU), Fert Beijing Institute and School of Electronic and Information Engineering, ANR-16-CE24-0018,ELECSPIN,Dispositifs Spintronique assistés par champ électrique(2016), Centre de Nanosciences et de Nanotechnologies (C2N), Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), Centre National de la Recherche Scientifique (CNRS)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU), and Johannes Gutenberg - Universität Mainz (JGU)

Subjects
010302 applied physics, Materials science, Physics and Astronomy (miscellaneous), Spintronics, Magnetic domain, Condensed matter physics, 530 Physics, Perpendicular magnetic anisotropy, 02 engineering and technology, 530 Physik, 021001 nanoscience & nanotechnology, 01 natural sciences, [SPI]Engineering Sciences [physics], Domain wall (magnetism), Creep, [PHYS.COND.CM-GEN]Physics [physics]/Condensed Matter [cond-mat]/Other [cond-mat.other], 0103 physical sciences, Perpendicular anisotropy, Irradiation, [PHYS.COND]Physics [physics]/Condensed Matter [cond-mat], 0210 nano-technology, Anisotropy, ComputingMilieux_MISCELLANEOUS
Abstract

We study the influence of He+ irradiation induced interface intermixing on magnetic domain wall (DW) dynamics in W-CoFeB (0.6 nm)-MgO ultrathin films, which exhibit high perpendicular magnetic anisotropy and large Dzyaloshinskii-Moriya interaction (DMI) values. Whereas the pristine films exhibit strong DW pinning, we observe a large increase in the DW velocity in the creep regime upon He+ irradiation, which is attributed to the reduction of pinning centers induced by interface intermixing. Asymmetric in-plane field-driven domain expansion experiments show that the DMI value is slightly reduced upon irradiation, and a direct relationship between DMI and interface anisotropy is demonstrated. Our findings provide insights into the material design and interface control for DW dynamics, as well as for DMI, enabling the development of high-performance spintronic devices based on ultrathin magnetic layers.

Published
2019
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2. Design for a high resolution electron energy loss microscope

Author

A. Lafosse, Marian Mankos, Gerd Schönhense, L. Amiaud, Daniel Comparat, Nicholas Barrett, Khashayar Shadman, Raphaël Hahn, Yan J. Picard, O. Fedchenko, Electron Optica Inc., Laboratoire Aimé Cotton (LAC), Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), Institut für Physik [Mainz], Johannes Gutenberg - Universität Mainz (JGU), Institut des Sciences Moléculaires d'Orsay (ISMO), Laboratoire d'Etude des NanoStructures et Imagerie de Surface (LENSIS), Service de physique de l'état condensé (SPEC - UMR3680), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Institut Rayonnement Matière de Saclay (IRAMIS), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, and Johannes Gutenberg - Universität Mainz = Johannes Gutenberg University (JGU)

Subjects
Microscope, Materials science, EELS, Phonon, 02 engineering and technology, Electron, 01 natural sciences, law.invention, Optics, law, surface imaging, 0103 physical sciences, Microscopy, [PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], Instrumentation, Image resolution, LEEM, 010302 applied physics, Spectrometer, [PHYS.PHYS.PHYS-ATOM-PH]Physics [physics]/Physics [physics]/Atomic Physics [physics.atom-ph], business.industry, 021001 nanoscience & nanotechnology, Laser, Atomic and Molecular Physics, and Optics, Electronic, Optical and Magnetic Materials, Excited state, 0210 nano-technology, business
Abstract

International audience; An electron optical column has been designed for High Resolution Electron Energy Loss Microscopy (HREELM). The column is composed of electron lenses and a beam separator that are placed between an electron source based on a laser excited cesium atom beam and a time-of-flight (ToF) spectrometer or a hemispherical analyzer (HSA). The instrument will be able to perform full field low energy electron imaging of surfaces with sub-micron spatial resolution and meV energy resolution necessary for the analysis of local vibrational spectra. Thus, noncontact, real space mapping of microscopic variations in vibrational levels will be made possible. A second imaging mode will allow for the mapping of the phonon dispersion relations from microscopic regions defined by an appropriate field aperture.

Published
2019
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3. Terahertz spectroscopy for all-optical spintronic characterization of the spin-Hall-effect metals Pt, W and Cu80Ir20

Author

Markus Münzenberg, Oliver Gueckstock, Vasily V. Temnov, Samridh Jaiswal, Lukas Nadvornik, Tom Seifert, Mathias Kläui, S.M. Rouzegar, Gerhard Jakob, Tobias Kampfrath, Martin Wolf, N.M. Tran, Institut des Molécules et Matériaux du Mans (IMMM), Le Mans Université (UM)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Fritz-Haber-Institut der Max-Planck-Gesellschaft (FHI), Max Planck Society, Institut für Physik [Mainz], Johannes Gutenberg - Universität Mainz (JGU), Fachbereich Physik [Berlin], and Freie Universität Berlin

Subjects
Materials science, Acoustics and Ultrasonics, 530 Physics, terahertz emission spectroscopy, FOS: Physical sciences, 02 engineering and technology, 01 natural sciences, Transition metal, Hall effect, 0103 physical sciences, Mesoscale and Nanoscale Physics (cond-mat.mes-hall), ultrafast spincaloritronics, 010306 general physics, Spectroscopy, ComputingMilieux_MISCELLANEOUS, terahertz transmission spectroscopy, ultrafast spintronics, Condensed Matter - Materials Science, Spintronics, Condensed Matter - Mesoscale and Nanoscale Physics, business.industry, Relaxation (NMR), Refractory metals, Materials Science (cond-mat.mtrl-sci), 021001 nanoscience & nanotechnology, Condensed Matter Physics, 530 Physik, Condensed Matter::Mesoscopic Systems and Quantum Hall Effect, 3. Good health, Surfaces, Coatings and Films, Electronic, Optical and Magnetic Materials, Terahertz spectroscopy and technology, Spin Hall effect, [PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci], Optoelectronics, 0210 nano-technology, business
Abstract

Identifying materials with an efficient spin-to-charge conversion is crucial for future spintronic applications. In this respect, the spin Hall effect is a central mechanism as it allows for the interconversion of spin and charge currents. Spintronic material research aims at maximizing its efficiency, quantified by the spin Hall angle and the spin-current relaxation length . We develop an all-optical contact-free method with large sample throughput that allows us to extract and . Employing terahertz spectroscopy and an analytical model, magnetic metallic heterostructures involving Pt, W and Cu80Ir20 are characterized in terms of their optical and spintronic properties. The validity of our analytical model is confirmed by the good agreement with literature DC values. For the samples considered here, we find indications that the interface plays a minor role for the spin-current transmission. Our findings establish terahertz emission spectroscopy as a reliable tool complementing the spintronics workbench., Journal of Physics D: Applied Physics, 51 (36), ISSN:0022-3727, ISSN:1361-6463

Published
2018
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4. Skyrmions in Magnetic Multilayers: Chirality, Electrical Detection and Current-induced Motion

Author

Carlos A. F. Vaz, Nicolas Jaouen, Vincent Cros, William Legrand, S. McFadzean, Jörg Raabe, Albert Fert, Sophie Collin, Karim Bouzehouane, Christoforos Moutafis, Karin Garcia, Nicolas Reyren, Horia Popescu, Simone Finizio, Stephen McVitie, Davide Maccariello, Jean-Yves Chauleau, Sean Hughes, Drouhin, Henri-Jean, Wegrowe, Jean-Eric, Razeghi, Manijeh, Jaffrès, Henri, Unité mixte de physique CNRS/Thales (UMPhy CNRS/THALES), Centre National de la Recherche Scientifique (CNRS)-THALES, Synchrotron SOLEIL (SSOLEIL), Centre National de la Recherche Scientifique (CNRS), Institut für Physik [Mainz], Johannes Gutenberg - Universität Mainz (JGU), University of Cambridge [UK] (CAM), Paul Scherrer Institute (PSI), THALES [France]-Centre National de la Recherche Scientifique (CNRS), Johannes Gutenberg - Universität Mainz = Johannes Gutenberg University (JGU), and European Project: 665095,H2020,H2020-FETOPEN-2014-2015-RIA,MAGicSky(2015)

Subjects
Materials science, metal, nucleation, 02 engineering and technology, domain wall, 01 natural sciences, spin torque, MFM, XRMS, Electrical resistivity and conductivity, 0103 physical sciences, Microscopy, Electrical measurements, [PHYS.COND]Physics [physics]/Condensed Matter [cond-mat], 010306 general physics, Condensed matter physics, Scattering, multilayer, Skyrmion, STXM, 021001 nanoscience & nanotechnology, Domain wall (magnetism), skyrmion, Néel, Transmission electron microscopy, Magnetic force microscope, 0210 nano-technology
Abstract

International audience; Sub-100-nm skyrmions are stabilized in magnetic metallic multilayers and observed using transmission electron microscopy, magnetic force microscopy, scanning transmission X-ray microscopy and X-ray resonant magnetic scattering. All these advanced imaging techniques demonstrate the presence of "pure" Néel skyrmion textures with a determined chirality. Combining these observations with electrical measurements allows us to demonstrate reproducible skyrmion nucleation using current pulses, and measure their contribution to the transverse resistivity to detect them electrically. Once nucleated, skyrmions can be moved using charge currents. We find predominantly a creep-like regime, characterized by disordered skyrmion motion, as observed by atomic force microscopy and scanning transmission X-ray microscopy. These observations are explained qualitatively and to some extent quantitatively by the presence of crystalline grains of about 20 nm lateral size with a distribution of magnetic properties.

Published
2017
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5. Electroburning of few-layer graphene flakes, epitaxial graphene, and turbostratic graphene discs in air and under vacuum

Author

Domenica Convertino, Nils Richter, Wolfgang Wernsdorfer, Franck Balestro, Marco Affronte, Andrea Candini, Camilla Coletti, Mathias Kläui, Istituto di Nanoscienze, CNR-S3, Circuits électroniques quantiques Alpes (QuantECA), 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), Institut für Physik [Mainz], and Johannes Gutenberg - Universität Mainz (JGU)

Subjects
Molecular spintronics, molecular spintronics, Materials science, molecular electronics, Molecular electronics, General Physics and Astronomy, Nanotechnology, lcsh:Chemical technology, Epitaxy, Graphene based electrodes, lcsh:Technology, Full Research Paper, Graphene, Materials Science (all), Electrical and Electronic Engineering, Physics and Astronomy (all), law.invention, law, lcsh:TP1-1185, ddc:530, General Materials Science, lcsh:Science, ComputingMilieux_MISCELLANEOUS, Graphene oxide paper, [PHYS]Physics [physics], lcsh:T, graphene based electrodes, Physics, Graphene foam, lcsh:QC1-999, Nanoscience, Electrode, lcsh:Q, Bilayer graphene, lcsh:Physics, Graphene nanoribbons
Abstract

Graphene-based electrodes are very promising for molecular electronics and spintronics. Here we report a systematic characterization of the electroburning (EB) process, leading to the formation of nanometer-spaced gaps, on different types of few-layer graphene (namely mechanically exfoliated graphene on SiO2, graphene epitaxially grown on the C-face of SiC and turbostratic graphene discs deposited on SiO2) under air and vacuum conditions. The EB process is found to depend on both the graphene type and on the ambient conditions. For the mechanically exfoliated graphene, performing EB under vacuum leads to a higher yield of nanometer-gap formation than working in air. Conversely, for graphene on SiC the EB process is not successful under vacuum. Finally, the EB is possible with turbostratic graphene discs only after the creation of a constriction in the sample using lithographic patterning.

Published
2015
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6. Recent developments in the manipulation of magnetic domain walls in CoFeB–MgO wires for applications to high-density nonvolatile memories

Author

Pham , Van Tuong, Marty , Williams, Marty , Matthieu, Marty , Jean-Philippe, Zahnd , Gilles, Pham , T., Marty , Alain, Laczkowski , L, Savero Torres , T, Beigne , C., Vergnaud , C., Jamet , M., Attané , A, Ravelosona , D., Diez , L. Herrera, Zhao , W., Kläui , M., Ockert , B., Mantovan , R., Lamperti , A., Baldi , L., Jacques , V., Vila , Laurent, Cowburn , R., SPINtronique et TEchnologie des Composants ( SPINTEC ), Institut Nanosciences et Cryogénie ( INAC ), Commissariat à l'énergie atomique et aux énergies alternatives ( CEA ) -Université Grenoble Alpes ( UGA ) -Commissariat à l'énergie atomique et aux énergies alternatives ( CEA ) -Université Grenoble Alpes ( UGA ) -Centre National de la Recherche Scientifique ( CNRS ), SC2G - Semi-conducteurs à large bande interdite, Institut Néel ( NEEL ), Université Joseph Fourier - Grenoble 1 ( UJF ) -Centre National de la Recherche Scientifique ( CNRS ) -Université Grenoble Alpes ( UGA ) -Université Joseph Fourier - Grenoble 1 ( UJF ) -Centre National de la Recherche Scientifique ( CNRS ) -Université Grenoble Alpes ( UGA ), Laboratoire d'Ingénierie des Systèmes Biologiques et des Procédés ( LISBP ), Institut National de la Recherche Agronomique ( INRA ) -Institut National des Sciences Appliquées - Toulouse ( INSA Toulouse ), Institut National des Sciences Appliquées ( INSA ) -Institut National des Sciences Appliquées ( INSA ) -Centre National de la Recherche Scientifique ( CNRS ), Institut d'électronique fondamentale ( IEF ), Université Paris-Sud - Paris 11 ( UP11 ) -Centre National de la Recherche Scientifique ( CNRS ), Systèmes interfaciaux à l'echelle nanometrique ( SIEN ), Université Pierre et Marie Curie - Paris 6 ( UPMC ) -ESPCI ParisTech-Centre National de la Recherche Scientifique ( CNRS ), Institut für Physik [Mainz], Johannes Gutenberg - Universität Mainz ( JGU ), Laboratoire de Physique des Solides ( LPS ), Institut d'électronique fondamentale (IEF), Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS), Johannes Gutenberg - Universität Mainz (JGU), Singulus technology AG, Laboratorio MDM (IMM-CNR), Consiglio Nazionale delle Ricerche [Roma] (CNR), Laboratoire de Physique des Solides (LPS), Centre National de la Recherche Scientifique (CNRS)-Université Paris-Sud - Paris 11 (UP11), 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), University of Cambridge [UK] (CAM), Johannes Gutenberg - Universität Mainz = Johannes Gutenberg University (JGU), and National Research Council of Italy | Consiglio Nazionale delle Ricerche (CNR)

Subjects
Materials science, Spintronics, Magnetic domain, Condensed matter physics, business.industry, [ PHYS.COND.CM-MS ] Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci], 02 engineering and technology, magnetic domain walls, magnetic anisotropy, mass storage, 021001 nanoscience & nanotechnology, 01 natural sciences, Engineering physics, Magnetic field, Domain wall (magnetism), Semiconductor, CMOS, Electric field, 0103 physical sciences, Computer data storage, [PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci], [PHYS.COND]Physics [physics]/Condensed Matter [cond-mat], 010306 general physics, 0210 nano-technology, business, ComputingMilieux_MISCELLANEOUS, [ PHYS.COND ] Physics [physics]/Condensed Matter [cond-mat]
Abstract

The recent discovery that magnetic domain walls can be moved under a small current without any magnetic field opens a perspective for a paradigm shift in mass storage design. However, several fundamental questions must be answered before the technology can be considered feasible. This review covers the current understanding of domain wall (DW) propagation in CoFeB–MgO structures with perpendicular magnetic anisotropy. These films exhibit a very low density of pinning centers and can be integrated in Magnetic Tunnel Junctions, making them very promising for manipulating multiple domain walls in ultra-high-density spintronic devices. Several important issues are addressed: the physics of magnetic field, current and electric field driven domain wall motion, the characterization of the pinning potential on the nanoscale, the demonstration of artificial storing pinning sites, and the evaluation of domain wall propagation for logic and memory design integrated into complementary metal-oxide semiconductor (CMOS) technology.

Published
2015
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7. Efficient spin transfer torque in La2/3Sr1/3MnO3 nanostructures

Author

Michael Foerster, Mathias Kläui, Laurence Méchin, C. A. F. Vaz, Vasily Moshnyaga, Simone Finizio, Stefan Eisebitt, T. Schulz, Luis Peña, Felix Büttner, André Bisig, S. Hühn, Jan Heinen, Institut für Physik [Mainz], Johannes Gutenberg - Universität Mainz (JGU), ALBA Synchrotron light source [Barcelone], Swiss FEL [Villigen], Paul Scherrer Institute (PSI), Fachbereich Physik [Konstanz], University of Konstanz, Institut fur Optik und Atomare Physik, Technische Universität Berlin (TU), Equipe Electronique - Laboratoire GREYC - UMR6072, Groupe de Recherche en Informatique, Image et Instrumentation de Caen (GREYC), Centre National de la Recherche Scientifique (CNRS)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Normandie Université (NU)-Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU), and Georg-August-University [Göttingen]

Subjects
Permalloy, Materials science, Physics and Astronomy (miscellaneous), Condensed matter physics, Magnetoresistance, 530 Physics, Spin-transfer torque, 530 Physik, Magnetization, [SPI]Engineering Sciences [physics], Domain wall (magnetism), Torque, Condensed Matter::Strongly Correlated Electrons, ddc:530, Electric current, [SPI.NANO]Engineering Sciences [physics]/Micro and nanotechnologies/Microelectronics, Spin-½
Abstract

This article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing. This material originally appeared in Appl. Phys. Lett. 104, 072410 (2014) and may be found at https://doi.org/10.1063/1.4865415. We carry out low temperature magnetotransport measurements on nanostructured La2/3Sr1/3MnO3 wires to study the interaction between spin-polarized current and magnetization in this half metallic material. We selectively position domain walls by applying external fields. The domain wall resistance is found to be positive, in contrast to conventional 3d metals. The depinning field is reduced when current pulses are injected into the wire. By comparing measurements for both current polarities, we can disentangle heating and spin transfer torque effects. The determined spin transfer torque efficiency is of the order of 4 × 10−14 Tm2/A, which is significantly higher than in permalloy.

Published
2014
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8. The 2014 Magnetism Roadmap

Author

Bernard Dieny, Burkard Hillebrands, Gerrit E. W. Bauer, Jan Ulrich Thiele, Stephan Breitkreutz, Andrii V. Chumak, Martin Bowen, Mathias Kläui, Sara A. Majetich, Johan Åkerman, Robert Stamps, Ioan Lucian Prejbeanu, Nora Dempsey, Yoshichika Otani, SUPA School of Physics and Astronomy [Glasgow], University of Glasgow, Technische Universität Munchen - Université Technique de Munich [Munich, Allemagne] (TUM), University of Gothenburg (GU), Fachbereich Physik [Kaiserslautern], Technische Universität Kaiserslautern (TU Kaiserslautern), Institute for Solid State Physics [Tokyo] (ISSP), The University of Tokyo (UTokyo), Institut für Halbleiter und Festkörperphysik, Johannes Kepler Universität, HGST San Jose Research Center, 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), Department of Physics [Pittsburgh], Carnegie Mellon University [Pittsburgh] (CMU), Institut für Physik [Mainz], Johannes Gutenberg - Universität Mainz (JGU), 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), 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), 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), Johannes Gutenberg - Universität Mainz = Johannes Gutenberg University (JGU), and Micro et NanoMagnétisme (NEEL - MNM)

Subjects
[PHYS]Physics [physics], Dynamic field, Random access memory, Condensed Matter - Materials Science, Materials science, Acoustics and Ultrasonics, Scope (project management), Condensed Matter - Mesoscale and Nanoscale Physics, Magnetism, New materials, Materials Science (cond-mat.mtrl-sci), FOS: Physical sciences, Condensed Matter Physics, Field (computer science), Surfaces, Coatings and Films, Electronic, Optical and Magnetic Materials, Mesoscale and Nanoscale Physics (cond-mat.mes-hall), Systems engineering
Abstract

Magnetism is a very fascinating and dynamic field. Especially in the last 30 years it has experienced many major advances in the full range from novel fundamental phenomena to new products. Applications such as hard disk drives and magnetic sensors are part of our daily life, and new applications, such as in non-volatile computer random access memory, are expected to surface shortly. Thus it is timely for describing the current status, and current and future challenges in the form of a Roadmap article. This 2014 Magnetism Roadmap provides a view on several selected, currently very active innovative developments. It consists of 12 sections, each written by an expert in the field and addressing a specific subject, with strong emphasize on future potential. This Roadmap cannot cover the entire field. We have selected several highly relevant areas without attempting to provide a full review - a future update will have room for more topics. The scope covers mostly nano-magnetic phenomena and applications, where surfaces and interfaces provide additional functionality. New developments in fundamental topics such as interacting nano-elements, novel magnon-based spintronics concepts, spin-orbit torques and spin-caloric phenomena are addressed. New materials, such as organic magnetic materials and permanent magnets are covered. New applications are presented such as nano-magnetic logic, non-local and domain-wall based devices, heat-assisted magnetic recording, magnetic random access memory, and applications in biotechnology. May the Roadmap serve as a guideline for future emerging research directions in modern magnetism., 37 pages

Published
2014
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9. Control of the magnetization in pre-patterned half-metallic La0.7Sr0.3MnO3 nanostructures

Author

H. S. Körner, Frithjof Nolting, Mathias Kläui, Sebastian Schweitzer, C. A. F. Vaz, T. O. Menteş, Laurence Méchin, Phillip Wohlhüter, Alan Farhan, Miguel Angel Niño, Jan Rhensius, J. Heidler, L. Le Guyader, Laura J. Heyderman, Florian Kronast, André Bisig, Andrea Locatelli, The Swiss Light Source (SLS) (SLS-PSI), Paul Scherrer Institute (PSI), Swiss FEL [Villigen], Laboratory for Micro- and Nanotechnology, Paul Scherrer Institut, Fachbereich Physik [Konstanz], University of Konstanz, Institut für Physik [Mainz], Johannes Gutenberg - Universität Mainz (JGU), Equipe Electronique - Laboratoire GREYC - UMR6072, Groupe de Recherche en Informatique, Image et Instrumentation de Caen (GREYC), Centre National de la Recherche Scientifique (CNRS)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Normandie Université (NU)-Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU), Elettra Sincrotrone Trieste, Helmholtz-Zentrum Berlin für Materialien und Energie GmbH (HZB), and Référent, Greyc

Subjects
Materials science, [SPI] Engineering Sciences [physics], 530 Physics, [SPI.NANO] Engineering Sciences [physics]/Micro and nanotechnologies/Microelectronics, General Physics and Astronomy, 02 engineering and technology, 01 natural sciences, Magnetization, Condensed Matter::Materials Science, [SPI]Engineering Sciences [physics], Nuclear magnetic resonance, 0103 physical sciences, [SPI.NANO]Engineering Sciences [physics]/Micro and nanotechnologies/Microelectronics, 010302 applied physics, Magnetic structure, Condensed matter physics, Magnetic circular dichroism, 021001 nanoscience & nanotechnology, 530 Physik, Magnetic field, Amorphous solid, Magnetic anisotropy, Photoemission electron microscopy, Domain wall (magnetism), Condensed Matter::Strongly Correlated Electrons, 0210 nano-technology
Abstract

International audience; The evolution of the magnetization configurations in highly spin polarized La0:7Sr0:3MnO3 (LSMO) thin film elements (20-60 nm in thickness) as a function of external magnetic field and temperature is studied by direct magnetic imaging using x-ray magnetic circular dichroism photoemission electron microscopy. The sample structuring is done via a pre-patterning process using a Cr mask layer. The LSMO grows amorphous on the Cr layer for the 20 nm thick film but polycrystalline at larger thicknesses. Temperature dependent studies allow for a direct comparison of the properties of the strained and unstrained LSMO regions on a single sample and show that the polycrystalline areas exhibit a higher TC compared to the epitaxial areas. The single crystalline areas are largely magnetically decoupled from the matrix. The magnetic switching between domain states and domain wall spin structures is determined for LSMO ring elements of varying size and thickness. We find that the magnetic field values required to depin domain walls or to nucleate domains increase with decreasing ring width due to the increasing role of shape anisotropy and edge defects. Both transverse and vortex domain walls are stable spin configurations at room temperature and at zero field. In particular, we demonstrate that the desired domain wall type can be selected by applying an appropriate field sequence.

Published
2012

10. Spectroscopy of the electronic states of the Heusler compounds Co2FeAl and Co2Cr0.6Fe0.4Al and the influence of oxidation

Author

Fabian Große-Schulte, Martin Jourdan, Gerd Schönhense, Michaela Hahn, Institut für Physik [Mainz], and Johannes Gutenberg - Universität Mainz (JGU)

Subjects
Materials science, Acoustics and Ultrasonics, Photoemission spectroscopy, Inverse photoemission spectroscopy, Analytical chemistry, Angle-resolved photoemission spectroscopy, Fermi energy, 02 engineering and technology, 021001 nanoscience & nanotechnology, Condensed Matter Physics, 01 natural sciences, Surfaces, Coatings and Films, Electronic, Optical and Magnetic Materials, 13. Climate action, Chemisorption, Excited state, Physical Sciences, 0103 physical sciences, 010306 general physics, 0210 nano-technology, Electronic band structure, Spectroscopy
Abstract

The band structures of the Heusler compounds Co2Cr0.6Fe0.4Al and Co2FeAl were investigated in situ by angle-resolved ultraviolet photoemission spectroscopy. The samples were prepared by a sputtering process optimized for tunnelling junction preparation, the photoemission process in the normal direction of the (0 0 1)-oriented thin films was excited by a helium gas discharge lamp (hν = 21.2 eV and hν = 40.8 eV). The spectra of clean samples are compared with calculations of the total and partial bulk density of states and are evaluated within the three-step model of photoemission. Basic agreement with theoretical predictions of the bulk band structure is concluded. At oxygen exposures of the thin films of only 1 Langmuir a chemisorption phase with significant changes in the valence-band spectrum near the Fermi energy is observed. At 10 L oxygen the spectra are indicative of an oxide within the UPS probing depth.

Published
2011
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11. Quantitative determination of domain wall coupling energetics

Author

Markus Laufenberg, Frithjof Nolting, Mathias Kläui, C. A. F. Vaz, Dirk Backes, Stefan Heun, J. A. C. Bland, Andrea Locatelli, T. Kasama, Ulrich Rüdiger, H. Ehrke, Salia Cherifi, Rafal E. Dunin-Borkowski, Daniel Bedau, Laura J. Heyderman, Fachbereich Physik [Konstanz], University of Konstanz, Department of Physics [New York], New York University [New York] (NYU), NYU System (NYU)-NYU System (NYU), Institut für Physik [Mainz], Johannes Gutenberg - Universität Mainz (JGU), Paul Scherrer Institute (PSI), Cavendish Laboratory, University of Cambridge [UK] (CAM), Laboratoire Louis Néel (LLN), Centre National de la Recherche Scientifique (CNRS), and Elettra Sincrotrone Trieste

Subjects
electron holography, Materials science, Physics and Astronomy (miscellaneous), magnetic structure, 02 engineering and technology, 01 natural sciences, Electron holography, Condensed Matter::Materials Science, 75.60.Ch, 75.50.Cc, 75.50.Bb, 75.25.+z, 75.50.Tt, 78.20.Ls, 0103 physical sciences, nanostructured materials, ddc:530, 010306 general physics, Condensed matter physics, Magnetic circular dichroism, Demagnetizing field, 021001 nanoscience & nanotechnology, Vortex, Photoemission electron microscopy, photoelectron microscopy, Domain wall (magnetism), Ferromagnetism, [PHYS.COND.CM-GEN]Physics [physics]/Condensed Matter [cond-mat]/Other [cond-mat.other], magnetic domain walls, 0210 nano-technology, Magnetic dipole–dipole interaction, magnetic circular dichroism
Abstract

International audience; The magnetic dipolar coupling of head-to-head domain walls is studied in 350 nm wide NiFe and Co nanostructures by high resolution magnetic imaging. We map the stray field of a domain wall directly with sub-10-nm resolution using off-axis electron holography and find that the field intensity decreases as 1/r with distance. By using x-ray magnetic circular dichroism photoemission electron microscopy, we observe that the spin structures of interacting domain walls change from vortex to transverse walls, when the distance between the walls is reduced to below (77±5) nm for 27 nm thick NiFe and (224±65) nm for 30 nm thick Co elements. Using measured stray field values, the energy barrier height distribution for the nucleation of a vortex core is obtained.

Published
2006
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