Enhanced thermally-activated skyrmion diffusion with tunable effective gyrotropic force

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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DOHI, Takaaki, Markus WEISSENHOFER, Nico KERBER, Fabian KAMMERBAUER, Yuqing GE, Klaus RAAB, Jakub ZÁZVORKA, Maria-Andromachi SYSKAKI, Ulrich NOWAK, Mathias KLÄUI, 2023. Enhanced thermally-activated skyrmion diffusion with tunable effective gyrotropic force. In: Nature Communications. Springer. 2023, 14(1), 5424. eISSN 2041-1723. Available under: doi: 10.1038/s41467-023-40720-0

BibTex

@article{Dohi2023-09-11Enhan-67799,
  year={2023},
  doi={10.1038/s41467-023-40720-0},
  title={Enhanced thermally-activated skyrmion diffusion with tunable effective gyrotropic force},
  number={1},
  volume={14},
  journal={Nature Communications},
  author={Dohi, Takaaki and Weißenhofer, Markus and Kerber, Nico and Kammerbauer, Fabian and Ge, Yuqing and Raab, Klaus and Zázvorka, Jakub and Syskaki, Maria-Andromachi and Nowak, Ulrich and Kläui, Mathias},
  note={Article Number: 5424}
}

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