Affiliation:
1. Johannes Gutenberg‐Universität Mainz Institut für Physik Staudingerweg 7 55128 Mainz Germany
2. National Academy of Sciences of Ukraine Institute of Applied Physics 58 Petropavlivska St. Sumy 40000 Ukraine
3. Singulus Technologies AG Hanauer Landstraße 103 63796 Kahl am Main Germany
4. Biomedical Engineering Department Ben Gurion University of the Negev Be'er Sheva 84105 Israel
Abstract
AbstractThermally induced skyrmion dynamics, as well as skyrmion pinning effects, in thin films have attracted significant interest. While pinning poses challenges in deterministic skyrmion devices and slows down skyrmion diffusion, for applications in non‐conventional computing, both pinning of an appropriate strength and skyrmion diffusion speed are key. Here, periodic field excitations are employed to realize an increase of the skyrmion diffusion by more than two orders of magnitude. Amplifying the excitation, a drastic reduction of the effective skyrmion pinning, is reported, and a transition from pinning‐dominated diffusive hopping to dynamics approaching free diffusion is observed. By tailoring the field oscillation frequency and amplitude, a continuous tuning of the effective pinning and skyrmion dynamics is demonstrated, which is a key asset and enabler for non‐conventional computing applications. It is found that the periodic excitations additionally allow stabilization of skyrmions at different sizes for field values that are inaccessible in static systems, opening up new approaches to ultrafast skyrmion motion by transiently exciting moving skyrmions.
Funder
Deutsche Forschungsgemeinschaft
Subject
Mechanical Engineering,Mechanics of Materials,General Materials Science
Cited by
4 articles.
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