Enhanced thermally-activated skyrmion diffusion with tunable effective gyrotropic force

Takaaki Dohi (), Markus Weißenhofer (), Nico Kerber, Fabian Kammerbauer, Yuqing Ge, Klaus Raab, Jakub Zázvorka, Maria-Andromachi Syskaki, Aga Shahee, Moritz Ruhwedel, Tobias Böttcher, Philipp Pirro, Gerhard Jakob, Ulrich Nowak and Mathias Kläui ()
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Takaaki Dohi: Institut für Physik, Johannes Gutenberg-Universität Mainz
Markus Weißenhofer: Universität Konstanz
Nico Kerber: Institut für Physik, Johannes Gutenberg-Universität Mainz
Fabian Kammerbauer: Institut für Physik, Johannes Gutenberg-Universität Mainz
Yuqing Ge: Institut für Physik, Johannes Gutenberg-Universität Mainz
Klaus Raab: Institut für Physik, Johannes Gutenberg-Universität Mainz
Jakub Zázvorka: Charles University
Maria-Andromachi Syskaki: Institut für Physik, Johannes Gutenberg-Universität Mainz
Aga Shahee: Institut für Physik, Johannes Gutenberg-Universität Mainz
Moritz Ruhwedel: Fachbereich Physik and Landesforschungszentrum OPTIMAS, Technische Universität Kaiserslautern
Tobias Böttcher: Graduate School of Excellence Materials Science in Mainz
Philipp Pirro: Fachbereich Physik and Landesforschungszentrum OPTIMAS, Technische Universität Kaiserslautern
Gerhard Jakob: Institut für Physik, Johannes Gutenberg-Universität Mainz
Ulrich Nowak: Universität Konstanz
Mathias Kläui: Institut für Physik, Johannes Gutenberg-Universität Mainz

Nature Communications, 2023, vol. 14, issue 1, 1-10

Abstract: Abstract Magnetic skyrmions, topologically-stabilized spin textures that emerge in magnetic systems, have garnered considerable interest due to a variety of electromagnetic responses that are governed by the topology. The topology that creates a microscopic gyrotropic force also causes detrimental effects, such as the skyrmion Hall effect, which is a well-studied phenomenon highlighting the influence of topology on the deterministic dynamics and drift motion. Furthermore, the gyrotropic force is anticipated to have a substantial impact on stochastic diffusive motion; however, the predicted repercussions have yet to be demonstrated, even qualitatively. Here we demonstrate enhanced thermally-activated diffusive motion of skyrmions in a specifically designed synthetic antiferromagnet. Suppressing the effective gyrotropic force by tuning the angular momentum compensation leads to a more than 10 times enhanced diffusion coefficient compared to that of ferromagnetic skyrmions. Consequently, our findings not only demonstrate the gyro-force dependence of the diffusion coefficient but also enable ultimately energy-efficient unconventional stochastic computing.

Date: 2023
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DOI: 10.1038/s41467-023-40720-0

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