MSCA ITN MagnEFi 860060
Published September 11, 2023 | Version v1
Publication Open

Enhanced thermally-activated skyrmion diffusion with tunable effective gyrotropic force

Creators

  • 1. Institut für Physik, Johannes Gutenberg-Universität Mainz, Staudingerweg 7, 55128, Mainz, Germany
  • 2. Laboratory for Nanoelectronics and Spintronics, Research Institute of Electrical Communication, Tohoku University, Sendai, 980–8577, Japan
  • 3. Fachbereich Physik, Universität Konstanz, DE-78457, Konstanz, Germany
  • 4. Department of Physics and Astronomy, Uppsala University, P.O. Box 516, S-751 20, Uppsala, Sweden
  • 5. Department of Physics, Freie Universität Berlin, Arnimallee 14, D-14195, Berlin, Germany
  • 6. Graduate School of Excellence Materials Science in Mainz, Staudingerweg 9, 55128, Mainz, Germany
  • 7. Institute of Physics, Faculty of Mathematics and Physics, Charles University, Ke Karlovu 5, Prague, 12116, Czech Republic
  • 8. Singulus Technologies AG, 63796, Kahl am Main, Germany
  • 9. Fachbereich Physik and Landesforschungszentrum OPTIMAS, Technische Universität Kaiserslautern, Gottlieb-Daimler-Straße 46, 67663, Kaiserslautern, Germany

Description

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.

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Additional details

Funding

MSCA ITN MagnEFi 860060
European Commission

Dates

Available
2023-09-11