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MA: Fachverband Magnetismus
MA 59: Posters Magnetism III
MA 59.12: Poster
Freitag, 20. März 2020, 09:00–12:00, P2/EG
Anisotropic Skyrmion Diffusion — •Klaus Raab1, Nico Kerber1,2, Markus Weißenhofer3, Kai Litzius1,2, Jakub Zázvorka1, Ulrich Nowak3, and Mathias Kläui1,2 — 1Institut für Physik, Johannes Gutenberg-Universität Mainz, DE-55099 Mainz, Germany — 2Graduate School of Excellence Materials Science in Mainz, 55128 Mainz, Germany — 3Fachbereich Physik, Universität Konstanz, Universitätsstraße 10, DE-78457 Konstanz, Germany
Thermally activated processes are intrinsic effects in every physical system and their understanding key to the underlaying dynamics of such systems. Using skyrmions, magnetic, topologically stabilized spin structures, we investigate the thermal diffusion dynamics in specifically tailored metal-multilayer. We find that for low pinning materials stacks, the thermal diffusion dominates the dynamics and allows for stable skyrmions at room temperature that move by thermal activation [1-3].
These stable Skyrmions allow for a wide range of possible applications in logic, data storage or Brownian token computing devices. In Brownian circuits the control of the skyrmion diffusion and the implementation of certain control is necessary. We show that by applying an in-plane field the skyrmion diffusion becomes anisotropic and controllable, while the absolute values of the diffusion coefficients are also drastically affected. We can analytically and numerically explain the anisotropic diffusion due to an elliptical deformation of the skyrmions by the application of the in-plane field, which leads to a preferential diffusion axis.