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1. Self-organised stripe domains and elliptical skyrmion bubbles in ultra-thin epitaxial Au{0.67}Pt{0.33}/Co/W(110) films

Author

Tevfik Onur Menteş, Olivier Fruchart, Andrea Locatelli, Jose Peña Garcia, Justin M. Shaw, Stefania Pizzini, Francesca Genuzio, Jan Vogel, Hans T. Nembach, Lorenzo Camosi, Micro et NanoMagnétisme (MNM), Institut Néel (NEEL), Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP ), Université Grenoble Alpes (UGA)-Université Grenoble Alpes (UGA)-Centre National de la Recherche Scientifique (CNRS)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP ), Université Grenoble Alpes (UGA)-Université Grenoble Alpes (UGA)-Centre National de la Recherche Scientifique (CNRS), ICN2 - Institut Catala de Nanociencia i Nanotecnologia (ICN2), Universitat Autònoma de Barcelona (UAB), SPINtronique et TEchnologie des Composants (SPINTEC), 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)-Université Grenoble Alpes (UGA)-Centre National de la Recherche Scientifique (CNRS), Elettra Sincrotrone Trieste, National Institute of Standards and Technology [Boulder] (NIST), Joint Institute for Laboratory Astrophysics (JILA), National Institute of Standards and Technology [Gaithersburg] (NIST)-University of Colorado [Boulder], ANR: LANEF,ANR-10-LABX-51-01 - LABEX LANEF, ANR-17-CE24-0025,TOPSKY,Propriétés topologiques des skyrmions magnétiques et opportunitiés pour le dévelopement de nouveaux dispositifs spintroniques(2017), European Project: 754303,GreQue, Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP ), Université Grenoble Alpes (UGA)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP ), Université Grenoble Alpes (UGA), Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche Interdisciplinaire de Grenoble (IRIG), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Grenoble Alpes (UGA), ANR-10-LABX-0051,LANEF,Laboratory of Alliances on Nanosciences - Energy for the Future(2010), and Micro et NanoMagnétisme (NEEL - MNM)

Subjects
Physics, Dzyaloshinskii-Moriya interaction, Condensed matter physics, magnetic skyrmions, Skyrmion, General Physics and Astronomy, 01 natural sciences, Symmetry (physics), 010305 fluids & plasmas, Magnetic field, Magnetic anisotropy, Magnetization, Photoemission electron microscopy, Domain wall (magnetism), epitaxial thin films, [PHYS.COND.CM-GEN]Physics [physics]/Condensed Matter [cond-mat]/Other [cond-mat.other], 0103 physical sciences, [PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci], Condensed Matter::Strongly Correlated Electrons, 010306 general physics, Anisotropy
Abstract

We studied the symmetry of magnetic properties and the resulting magnetic textures in ultra-thin epitaxial Au0.67Pt0.33/Co/W(110), a model system exhibiting perpendicular magnetic anisotropy and interface Dzyaloshinskii–Moriya interaction (DMI). As a peculiar feature, the C2v crystal symmetry induced by the Co/W interface results in an additional uniaxial in-plane magnetic anisotropy in the cobalt layer. Photo-emission electron microscopy with magnetic sensitivity reveals the formation of self-organised magnetic stripe domains oriented parallel to the hard in-plane magnetisation axis. We attribute this behavior to the lower domain wall energy when oriented along this axis, where both the DMI and the in-plane magnetic anisotropy favor a Néel domain wall configuration. The anisotropic domain wall energy also leads to the formation of elliptical skyrmion bubbles under a weak out-of-plane magnetic field.

Published
2021
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2. Coherent x-ray scattering in an XPEEM setup

Author

Andrea Locatelli, V. Schánilec, Nicolas Rougemaille, Francesca Genuzio, Jakub Sadílek, Tevfik Onur Menteş, Elettra Sincrotrone Trieste, Micro et NanoMagnétisme (MNM), Institut Néel (NEEL), Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP ), Université Grenoble Alpes (UGA)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP ), Université Grenoble Alpes (UGA), and Brno University of Technology [Brno] (BUT)

Subjects
Materials science, reconstruction, resonant x-ray scattering, 02 engineering and technology, 01 natural sciences, Speckle pattern, Optics, Lattice (order), 0103 physical sciences, Instrumentation, LEEM, 010302 applied physics, Scattering, business.industry, X-ray, XPEEM, 021001 nanoscience & nanotechnology, Reconstruction method, Coherent diffraction imaging, Atomic and Molecular Physics, and Optics, Charged particle, Electronic, Optical and Magnetic Materials, Photoemission electron microscopy, [PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci], speckle, CDI, 0210 nano-technology, business
Abstract

X-ray photoemission electron microscopy, one of the most successful imaging tools at synchrotrons, is known to have limitations related to the application of external fields and to the short electron mean free path. In order to overcome such issues, we adapt an existing XPEEM instrument to simultaneously perform coherent x-ray scattering measurements in reflectivity mode, thus adding a complementary method to XPEEM. Photon-in photon-out x-ray scattering provides the sensitivity to buried interfaces as well as the possibility to work under external fields, which is challenging when using charged particles for imaging. XPEEM, in turn, greatly alleviates the difficulties associated with the reconstruction methods used in coherent diffraction imaging. The combination of the two methods is demonstrated for an artifical spin-ice lattice showing both chemical and magnetic contrast.

Published
2020
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3. Flux-closure domains in high aspect ratio electroless-deposited CoNiB nanotubes

Author

Eric Gautier, Laurent Cagnon, Michal Staňo, B. Trapp, Maxime Rioult, Rachid Belkhou, Wolfgang Ensinger, Jean-Christophe Toussaint, Sandra Schaefer, Alessandro Sala, Tevfik Onur Menteş, Sebastian Bochmann, Andrea Locatelli, Sylvain Martin, Olivier Fruchart, Alexis Wartelle, 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 Grenoble Alpes [2016-2019] (UGA [2016-2019])-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019]), Department of Materials Science, Darmstadt University of Technology [Darmstadt], Synchrotron SOLEIL (SSOLEIL), Centre National de la Recherche Scientifique (CNRS), Elettra Sincrotrone Trieste, Friedrich-Alexander Universität Erlangen-Nürnberg (FAU), 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), LOEWE project RESPONSE of the Hessen State Ministry of Higher Education, Research and the Arts (HMWK), ANR-10-LABX-0051,LANEF,Laboratory of Alliances on Nanosciences - Energy for the Future(2010), and Micro et NanoMagnétisme (NEEL - MNM)

Subjects
Condensed Matter - Materials Science, Materials science, Condensed Matter - Mesoscale and Nanoscale Physics, Magnetic domain, Condensed matter physics, Materials Science (cond-mat.mtrl-sci), FOS: Physical sciences, Flux, 02 engineering and technology, 021001 nanoscience & nanotechnology, 01 natural sciences, Grain size, lcsh:QC1-999, Magnetic anisotropy, Magnetization, Magnetic Phenomena, Ferromagnetism, Mesoscale and Nanoscale Physics (cond-mat.mes-hall), 0103 physical sciences, [PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci], 010306 general physics, 0210 nano-technology, Anisotropy, lcsh:Physics
Abstract

We report the imaging of magnetic domains in ferromagnetic CoNiB nanotubes with very long aspect ratio, fabricated by electroless plating. While axial magnetization is expected for long tubes made of soft magnetic materials, we evidence series of azimuthal domains. We tentatively explain these by the interplay of anisotropic strain and/or grain size, with magneto-elasticity and/or anisotropic interfacial magnetic anisotropy. This material could be interesting for dense data storage, as well as curvature-induced magnetic phenomena such as the non-reciprocity of spin-wave propagation., Comment: Focus only on azimuthal domains, information on domain walls (part of v1) removed - title, abstract and discussion changed accordingly, tubular racetracks scheme removed; new references, figures. Submission to SciPost (reformatted, new abstract, DOI added to references). Enhanced discussion of anisotropy, disagreement of synchrotron data and magnetometry rectified, new MOKE data added

Published
2018
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4. Magnetic skyrmions in confined geometries: Effect of the magnetic field and the disorder

Author

Michael Foerster, Sarnjeet S. Dhesi, Eric Gautier, Gilles Gaudin, Alessandro Sala, Liliana D. Buda-Prejbeanu, Tevfik Onur Menteş, Lucia Aballe, Soong-Geun Je, Dayane de Souza Chaves, Jan Vogel, Andrea Locatelli, Stefania Pizzini, Stéphane Auffret, Olivier Boulle, Roméo Juge, Francesco Maccherozzi, 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 Grenoble Alpes [2016-2019] (UGA [2016-2019])-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019]), ALBA Synchrotron light source [Barcelone], Elettra Sincrotrone Trieste, IRER - Istituto Regionale di Ricerca della Lombardia, DIAMOND Light source, and Micro et NanoMagnétisme (NEEL - MNM)

Subjects
Nanostructure, FOS: Physical sciences, 02 engineering and technology, Magnetic skyrmion, 01 natural sciences, Condensed Matter::Materials Science, Mesoscale and Nanoscale Physics (cond-mat.mes-hall), 0103 physical sciences, Thin film, 010306 general physics, Anisotropy, ComputingMilieux_MISCELLANEOUS, Physics, Condensed Matter - Mesoscale and Nanoscale Physics, Condensed matter physics, Skyrmion, Condensed Matter::Mesoscopic Systems and Quantum Hall Effect, 021001 nanoscience & nanotechnology, Condensed Matter Physics, Electronic, Optical and Magnetic Materials, Magnetic field, Amplitude, [PHYS.COND.CM-GEN]Physics [physics]/Condensed Matter [cond-mat]/Other [cond-mat.other], [PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci], Nanodot, 0210 nano-technology
Abstract

We report on the effect of the lateral confinement and a perpendicular magnetic field on isolated room-temperature magnetic skyrmions in sputtered Pt/Co/MgO nanotracks and nanodots. We show that the skyrmions size can be easily tuned by playing on the lateral dimensions of the nanostructures and by using external magnetic field amplitudes of a few mT, which allow to reach sub-100 nm diameters. Our XMCD-PEEM observations also highlight the important role of the pinning on the skyrmions size and stability under an out-of-plane magnetic field. Micromagnetic simulations reveal that the effect of local pinning can be well accounted for by considering the thin film grain structure with local anisotropy variations and reproduce well the dependence of the skyrmion diameter on the magnetic field and the geometry., Comment: 17 pages, 4 figures

Published
2018
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5. Fragmentation of magnetism in artificial kagome dipolar spin ice

Author

Tevfik Onur Menteş, Benito Santos Burgos, V. D. Nguyen, Daniel Lacour, Michel Hehn, Ioan-Augustin Chioar, François Montaigne, Andrea Locatelli, Benjamin Canals, Nicolas Rougemaille, TMC - Théorie de la Matière Condensée, Institut Néel (NEEL), Université Grenoble Alpes (UGA)-Centre National de la Recherche Scientifique (CNRS)-Université Joseph Fourier - Grenoble 1 (UJF)-Université Grenoble Alpes (UGA)-Centre National de la Recherche Scientifique (CNRS)-Université Joseph Fourier - Grenoble 1 (UJF), MNM - Micro et NanoMagnétisme, Institut Jean Lamour (IJL), Université de Lorraine (UL)-Centre National de la Recherche Scientifique (CNRS), Elettra Sincrotrone Trieste, IMPACT N4S, ANR-15-IDEX-04-LUE,LUE,Lorraine Université d'Excellence(2016), Théorie de la Matière Condensée (TMC ), Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019])-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019]), Micro et NanoMagnétisme (MNM ), Institut de Chimie du CNRS (INC)-Université de Lorraine (UL)-Centre National de la Recherche Scientifique (CNRS), and ANR-15-IDEX-0004,LUE,Isite LUE(2015)

Subjects
Magnetism, Geometrical frustration, Science, General Physics and Astronomy, FOS: Physical sciences, 02 engineering and technology, 01 natural sciences, General Biochemistry, Genetics and Molecular Biology, Article, 0103 physical sciences, Mesoscale and Nanoscale Physics (cond-mat.mes-hall), Spin model, [PHYS.COND]Physics [physics]/Condensed Matter [cond-mat], 010306 general physics, ComputingMilieux_MISCELLANEOUS, Physics, Multidisciplinary, Condensed matter physics, Condensed Matter - Mesoscale and Nanoscale Physics, General Chemistry, 021001 nanoscience & nanotechnology, Spin ice, Reciprocal lattice, Dipole, Magnet, State of matter, Condensed Matter::Strongly Correlated Electrons, 0210 nano-technology
Abstract

Geometrical frustration in magnetic materials often gives rise to exotic, low-temperature states of matter, such as the ones observed in spin ices. Here we report the imaging of the magnetic states of a thermally active artificial magnetic ice that reveal the fingerprints of a spin fragmentation process. This fragmentation corresponds to a splitting of the magnetic degree of freedom into two channels and is evidenced in both real and reciprocal space. Furthermore, the internal organization of both channels is interpreted within the framework of a hybrid spin–charge model that directly emerges from the parent spin model of the kagome dipolar spin ice. Our experimental and theoretical results provide insights into the physics of frustrated magnets and deepen our understanding of emergent fields through the use of tailor-made magnetism., By nanofabricating arrays of dipolar-coupled bistable single-domain nanomagnets, artificial model systems exhibiting collective ordering may be realized. Here, the authors present signatures of spin fragmentation in low-energy states of an artificial kagome ice.

Published
2016
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6. Laterally inhomogeneous Au intercalation in epitaxial graphene on SiC(0001): a multimethod electron microscopy study

Author

Claire Mathieu, Tevfik Onur Menteş, Rachid Belkhou, Andrea Locatelli, Emiliano Pallecchi, Gilles Patriarche, Abdelkarim Ouerghi, 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, Elettra Sincrotrone Trieste, Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520 (IEMN), Centrale Lille-Institut supérieur de l'électronique et du numérique (ISEN)-Université de Valenciennes et du Hainaut-Cambrésis (UVHC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Polytechnique Hauts-de-France (UPHF), Laboratoire de photonique et de nanostructures (LPN), Centre National de la Recherche Scientifique (CNRS), and Synchrotron SOLEIL (SSOLEIL)

Subjects
[PHYS]Physics [physics], Materials science, Graphene, business.industry, Doping, Nanotechnology, 02 engineering and technology, 021001 nanoscience & nanotechnology, 01 natural sciences, law.invention, chemistry.chemical_compound, chemistry, law, Transmission electron microscopy, 0103 physical sciences, Silicon carbide, Optoelectronics, 010306 general physics, 0210 nano-technology, Bilayer graphene, business, Layer (electronics), Graphene nanoribbons, Graphene oxide paper
Abstract

International audience; Epitaxial graphene is of particular interest because of its tunable electronic structure. One important approach to tune the electronic properties of graphene relays on intercalating atomic species between graphene and the topmost silicon carbide layer. Here, we investigated the morphology and electronic structure of gold-intercalated epitaxial graphene using a multitechnique approach combining spectroscopic photoemission low-energy electron microscopy (SPELEEM) for chemical and structural characterization at mesoscopic length scale and with transmission electron microscopy (STEM) at the atomic level. Deposition of gold on ex situ prepared graphene on SiC(0 0 0 1) results in the partial intercalation of Au adatoms under graphene, with the formation of a buffer layer of variable thickness. Gold has also shown to aggregate in nanometer-sized clusters lying on top of the same graphene film. X-ray photo-emission electron microscopy measurements indicate that Au induces only small changes in the doping of the graphene layer, which does not develop a quasi free-standing behavior.

Published
2016
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7. Broadband Setup for Magnetic-Field-Induced Domain Wall Motion in Cylindrical Nanowires

Author

C. Thirion, Raja Afid, Laurent Cagnon, Olivier Fruchart, Jean-Christophe Toussaint, Sandrine Da Col, Sebastian Bochmann, Ségolène Jamet, Andrea Locatelli, Julien Bachmann, Alexis Wartelle, Tevfik Onur Menteş, 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), Friedrich-Alexander Universität Erlangen-Nürnberg (FAU), Elettra Sincrotrone Trieste, European Project: 309589,EC:FP7:NMP,FP7-NMP-2012-SMALL-6,M3D(2012), 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
Physics, Condensed Matter - Materials Science, Magnetization dynamics, Field (physics), business.industry, domain walls, Coplanar waveguide, micromagnetics, Materials Science (cond-mat.mtrl-sci), FOS: Physical sciences, magnetization dynamics, high-frequency electronics, Electronic, Optical and Magnetic Materials, Magnetic field, Optics, Domain wall (magnetism), [PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci], Waveguide (acoustics), Electrical and Electronic Engineering, Magnetic force microscope, business, Micromagnetics, Instrumentation
Abstract

International audience; In order to improve the precision of domain wall dynamics measurements, we develop a coplanar waveguide-based setup where the domain wall motion should be triggered by pulses of magnetic field. The latter are produced by the Oersted field of the waveguide as a current pulse travels toward its termination, where it is dissipated. Our objective is to eliminate a source of bias in domain wall speed estimation while optimizing the field amplitude. Here, we present implementations of this concept for magnetic force microscopy (MFM) and synchrotron-based investigation.

Published
2015
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8. Pattern induced ordering of semiconducting graphene ribbons grown from nitrogen-seeded SiC

Author

Gang Liu, Feng Wang, Andrea Locatelli, Tevfik Onur Menteş, Leonard C. Feldman, Sara Rothwell, Nicholas Barrett, Claire Mathieu, M. S. Nevius, Alessandro Sala, Edward H. Conrad, Philip I. Cohen, Georgia Institute of Technology [Atlanta], Institute for Advanced Materials Devices and Nanotechnology, Rutgers University, Rutgers, The State University of New Jersey [New Brunswick] (RU), Rutgers University System (Rutgers)-Rutgers University System (Rutgers), 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), Elettra Sincrotrone Trieste, Department of Electrical and Computer Engineering [Minneapolis] (ECE), University of Minnesota [Twin Cities] (UMN), University of Minnesota System-University of Minnesota System, and The NSF under Grant Nos. DMR-1206793, DMR-1206655, and DMR-1206256? Additional support : The NSF DMR-1005880 and the W.M. Keck Foundation

Subjects
[PHYS]Physics [physics], Materials science, Fabrication, Graphene, business.industry, Wide-bandgap semiconductor, Nanotechnology, General Chemistry, Electronic structure, Epitaxy, law.invention, law, Optoelectronics, General Materials Science, business, Bilayer graphene, Graphene nanoribbons, Graphene oxide paper
Abstract

International audience; A wide band gap semiconducting form of graphene can be produced by growing a buckled form of graphene from a SiC(0001) surface randomly seeded with nitrogen. In this work, we show that the disorder observed in this form of graphene can be substantially reduced by pre-patterning the nitrogen seeded SiC surface into trenches. The result of the patterning is highly improved film thickness variations, orientational epitaxy, domain size, and electronic structure. The ordering induced by this patterned growth offers a way to take advantage of the extremely high mobilities and switching speeds in C-face graphene devices while having the thickness uniformity and fabrication scalability normally only achievable for graphene grown on the SiC(0001) Si-face

Published
2015
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9. Current-induced vortex nucleation and annihilation in vortex domain walls

Author

Andrea Locatelli, Markus Laufenberg, Laura J. Heyderman, Dirk Backes, J. A. C. Bland, C. A. F. Vaz, Ulrich Rüdiger, Lucia Aballe, L. Heyne, Mathias Kläui, Salia Cherifi, Tevfik Onur Menteş, Fachbereich Physik [Konstanz], University of Konstanz, Cavendish Laboratory, University of Cambridge [UK] (CAM), Paul Scherrer Institute (PSI), Laboratoire Louis Néel (LLN), Centre National de la Recherche Scientifique (CNRS), Elettra Sincrotrone Trieste, and ALBA Synchrotron light source [Barcelone]

Subjects
Physics, Annihilation, Physics and Astronomy (miscellaneous), Condensed matter physics, Magnetic structure, Nucleation, 02 engineering and technology, Spin structure, 021001 nanoscience & nanotechnology, 01 natural sciences, spin torque, Vortex, Physics::Fluid Dynamics, PEEM, Condensed Matter::Superconductivity, [PHYS.COND.CM-GEN]Physics [physics]/Condensed Matter [cond-mat]/Other [cond-mat.other], 0103 physical sciences, Domain (ring theory), magnetic domain walls, PACS: 75.60.Ch, 75.25.+z, ddc:530, Current (fluid), 010306 general physics, 0210 nano-technology, Spin-½
Abstract

International audience; We report observations of the effect of electrical currents on the propagation and spin structure of vortex walls in NiFe wires. We find that magnetic vortices are nucleated and annihilated due to the spin torque effect. The velocity is found to be directly correlated with these transformations and decreases with increasing number of vortices. The transformations are observed in wide elements, while in narrower structures the propagation of single vortex walls prevails.

Published
2006
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