Thermally Driven Ratchet Motion of Skyrmion Microcrystal and Topological Magnon Hall Effect

ORAL

Abstract

By means of the Lorentz TEM, we have found that micron-sized crystals of topologically nontrivial spin textures so called skyrmions in thin specimens of MnSi and Cu2OSeO3 show unidirectional rotations. Our numerical simulation based on a stochastic Landau-Lifshitz-Gilbert equation demonstrates that these rotations are driven sheerly by thermal fluctuations in the presence of temperature gradient. We show that hidden behind the skyrmion rotation is the rotational flow of magnons deflected by the effective magnetic field of skyrmions.

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Authors

  • Masahito Mochizuki

    Aoyama Gakuin University

  • Xiuzhen Yu

    RIKEN Center for Emergent Matter Science, RIKEN CEMS

  • Shinichiro Seki

    RIKEN CEMS

  • Naoya Kanazawa

    University of Tokyo

  • Wataru Koshibae

    RIKEN CEMS, Wako 351-0198, Japan, RIKEN CEMS

  • Jiadong Zang

    Johns Hopkins Univ, Johns Hopkins University

  • Maxim Mostovoy

    University of Groningen

  • Yoshinori Tokura

    RIKEN Center for Emergent Matter Science, RIKEN Center for Emergent Matter Science (CEMS), University of Tokyo, RIKEN CEMS

  • Naoto Nagaosa

    RIKEN CEMS