Berlin 2024 – scientific programme

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MA: Fachverband Magnetismus

MA 12: Skyrmions I

MA 12.4: Talk

Monday, March 18, 2024, 15:45–16:00, EB 301

Walking Skyrmions: directed movement in oscillating magnetic fields — •Alla Bezvershenko, Hannah Dürschmidt, Leon-Sascha Gernert, and Achim Rosch — Institute for Theoretical Physics, University of Cologne, 50937 Cologne, Germany

Magnetic skyrmions are topologically non-trivial spin textures that attract great interest, offering a possible avenue towards novel spintronics applications. One of the reasons for it are small critical current densities needed to depin the skyrmion lattice. Pinning by disorder remains arguably one of the most important obstacles for all skyrmion-based non-equilibrium experiments and the creation of useful skyrmion devices. In this work, we introduce an elastic model for skyrmion strings in the bulk MnSi in the presence of pinning forces under oscillating magnetic fields. We discuss a remarkably rich non-equilibrium phase diagram of this model and find periodic magnetic driving schemes, under which a directed motion of skyrmion strings becomes possible.

Keywords: skyrmions; pinning; disorder; non-equilibrium