Regensburg 2022 – scientific programme
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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur
KFM 12: Skyrmions 1 (joint session MA/KFM)
KFM 12.4: Talk
Tuesday, September 6, 2022, 10:30–10:45, H37
Skyrmion automotion in confined geometries for applications — •Kilian Leutner1, Thomas Brian Winkler1, Hans Fangohr2,3, and Mathias Kläui1 — 1Johannes Gutenberg University, Institute for Physics, Staudinger Weg 7, 55128 Mainz, Germany — 2Max-Planck Institute for the Structure and Dynamics of Matter, Luruper Chaussee 149, 22761 Hamburg, Germany. — 3University of Southampton, SO17 1BJ, Southampton, United Kingdom
Magnetic skyrmions are promising candidates for energy-efficient applications due to their quasi-particle nature and their topological stabilization. We present here a new concept for a multi-turn sensor-counter based on skyrmions. The skyrmion-boundary force in confined geometries leads with the topology-dependent dynamics to the effect of automotion in certain cases. Automotion describes the movement of magnetic structures without the supply of external energy. For our case, we describe and investigate this effect with micromagnetic simulations and the coarse-grained Thiele equation. Automotion has already been demonstrated for domain walls [1], but is not well explored in skyrmionic systems yet.
[1] M.-A. Mawass et al, Phys. Rev. Applied 7, 044009, 2017