We are interested in novel spin textures, especially those occurring in three-dimensional magnetic objects such as nanowires, nanotubes and 3D MRAM. In these, specific effects are made possible by curvature, three-dimensional spin and space, and topology with azimuthal periodic boundary conditions. We design and fabricate devices, image the spin textures, and ultimately aim at addressing these with spin-polarized currents. The applied background includes the proposed concept of 3D race-track memory. This research topic is conducted in close collaboration with colleagues in the Theory group, with LEMMA laboratory at IRIG, with Institut Néel, and expert chemist groups in Germany.
Physics of spin textures
We aim at investigating the existence and dynamics of motion of 3D spin textures under magnetic field or spin-polarized current. While nanowires have been the initial focus, we are developing multilayered nanotubes for their higher versatility for spintronic purposes. Checking the strength of topological protection against their transformation or annihilation is a major goal. We also contribute to 3D MRAM development. We combine material synthesis, experimental investigations, and micromagnetic modelling.
Special samples need to be designed and synthesized to stabilize 3D spin textures. They may be based on bottom-up chemical synthesis (anodization, electroplating, electroless deposition, atomic layer deposition) and/or lithography for electrical contacting.
Advanced magnetic imaging
Magnetic imaging 3D spin textures is demanding in terms of spatial resolution, bulk/surface and multi-components sensitivity. We are developing expertise in various electron- and X-ray-based techniques, both in the lab and at external facilities.
- M3d, FP7 (2012-2016).
- MILF, ANR (2019-2022).
- C3DS, ANR-DFG (2019-2022).
- Institut NEEL, Grenoble, France.
- Prof. J. Bachmann. Department of Chemistry, Friedrich-Alexander-Universität Erlangen-Nürnberg, Germany.
- Prof. W. Ensinger. Materialanalytik – Technische Universität Darmstadt, Germany.
- C. Gatel, CEMES, Toulouse, France.
- L. Perez, IMDEA, Madrid, Spain.
- Prof. M. Vazquez, Group of Nanomagnetism and Magnetization Processes, CSIC-Madrid, Spain.
- A. Lubk, D. Wolf, IFW Dresden, Germany.
- J. M. de Teresa, Univ Zaragoza, Spain.
- A. Fernandez-Pacheco, The Cavendish Laboratory, Department of Physics, Cambridge, UK.
- Room-Temperature Skyrmions at Zero Field in Exchange-Biased Ultrathin Films (July 17th, 2020)
Magnetic skyrmions are topologically protected spin textures of great interest for nanoscale information storage and processing. However, stabilizing small skyrmions without applying an external magnetic field remains challenging. This study employs a thin ferromagnetic layer ...
- Spin-orbitronics at a topological insulator-semiconductor interface (July 02nd, 2020)
Topological insulators (TI) represent a new class of insulating materials hosting metallic surface states. Moreover, those surface states exhibit a Dirac cone energy dispersion where the strong spin-orbit coupling leads to a helical spin texture ...
- Topology and Œrsted field prevent Walker breakdown in cylindrical nanowires (December 06th, 2019)
Domain-wall motion in one-dimensional conduits is both a textbook case for magnetization dynamics and the understanding of spin torques, and of practical importance for the design of novel spintronic ICT devices. However, instabilities known as ...
- Seminar – Reservoir Computing with Random Magnetic Textures (November 13th, 2019)
On November 20th at 11:00, we have the pleasure to welcome Daniele Pinna from Johannes Gutenberg University. He will give us a seminar at CEA/SPINTEC (*) Bat 1005, room 445, entitled : Reservoir Computing with Random ...
- Seminar – Chirality in thin films and multilayers probed by Soft x-ray (coherent) scattering (November 06th, 2019)
On December 2th at 11:00, we have the pleasure to welcome Nicolas Jaouen from SEXTANTS beamline, Synchrotron SOLEIL. He will give us a seminar at CEA/SPINTEC (*) Bat 1005, room 445, entitled : Chirality in thin ...
Former team members
- Sylvain MARTIN (2016-2018)
- Chloé BOUARD (2015-2018)
- Beatrix TRAPP (2015-2018). Joint with Institut NEEL.
- Alexis WARTELLE (2013-2017). Joint with Institut NEEL.
- Hoel ROBERT (2018). Joint with INAC/MEM.