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Universal current-velocity relation of skyrmion motion in chiral magnets

Author

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  • Junichi Iwasaki

    (The University of Tokyo, 7-3-1, Hongo, Bunkyo-ku)

  • Masahito Mochizuki

    (The University of Tokyo, 7-3-1, Hongo, Bunkyo-ku)

  • Naoto Nagaosa

    (The University of Tokyo, 7-3-1, Hongo, Bunkyo-ku
    Cross-Correlated Materials Research Group (CMRG), and Correlated Electron Research Group (CERG), RIKEN-ASI, Wako)

Abstract

Current-driven motion of the magnetic domain wall in ferromagnets is attracting intense attention because of potential applications such as racetrack memory. There, the critical current density to drive the motion is ~109–1012 A m−2. The skyrmions recently discovered in chiral magnets have much smaller critical current density of ~105–106 A m−2, but the microscopic mechanism is not yet explored. Here we present a numerical simulation of Landau–Lifshitz–Gilbert equation, which reveals a remarkably robust and universal current-velocity relation of the skyrmion motion driven by the spin-transfer-torque unaffected by either impurities or nonadiabatic effect in sharp contrast to the case of domain wall or spin helix. Simulation results are analysed using a theory based on Thiele’s equation, and it is concluded that this behaviour is due to the Magnus force and flexible shape-deformation of individual skyrmions and skyrmion crystal, which enable them to avoid pinning centres.

Suggested Citation

  • Junichi Iwasaki & Masahito Mochizuki & Naoto Nagaosa, 2013. "Universal current-velocity relation of skyrmion motion in chiral magnets," Nature Communications, Nature, vol. 4(1), pages 1-8, June.
    • Handle: RePEc:nat:natcom:v:4:y:2013:i:1:d:10.1038_ncomms2442
    DOI: 10.1038/ncomms2442
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    Cited by:

    1. Raphael Gruber & Jakub Zázvorka & Maarten A. Brems & Davi R. Rodrigues & Takaaki Dohi & Nico Kerber & Boris Seng & Mehran Vafaee & Karin Everschor-Sitte & Peter Virnau & Mathias Kläui, 2022. "Skyrmion pinning energetics in thin film systems," Nature Communications, Nature, vol. 13(1), pages 1-9, December.
    2. Licong Peng & Kosuke Karube & Yasujiro Taguchi & Naoto Nagaosa & Yoshinori Tokura & Xiuzhen Yu, 2021. "Dynamic transition of current-driven single-skyrmion motion in a room-temperature chiral-lattice magnet," Nature Communications, Nature, vol. 12(1), pages 1-7, December.
    3. Weiwei Wang & Dongsheng Song & Wensen Wei & Pengfei Nan & Shilei Zhang & Binghui Ge & Mingliang Tian & Jiadong Zang & Haifeng Du, 2022. "Electrical manipulation of skyrmions in a chiral magnet," Nature Communications, Nature, vol. 13(1), pages 1-7, December.
    4. Anthony K. C. Tan & Pin Ho & James Lourembam & Lisen Huang & Hang Khume Tan & Cynthia J. O. Reichhardt & Charles Reichhardt & Anjan Soumyanarayanan, 2021. "Visualizing the strongly reshaped skyrmion Hall effect in multilayer wire devices," Nature Communications, Nature, vol. 12(1), pages 1-8, December.

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