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Skyrmion dynamics in a frustrated ferromagnetic film and current-induced helicity locking-unlocking transition

Author

Listed:
  • Xichao Zhang

    (The Chinese University of Hong Kong)

  • Jing Xia

    (The Chinese University of Hong Kong)

  • Yan Zhou

    (The Chinese University of Hong Kong)

  • Xiaoxi Liu

    (Shinshu University)

  • Han Zhang

    (Shenzhen University)

  • Motohiko Ezawa

    (The University of Tokyo)

Abstract

The helicity-orbital coupling is an intriguing feature of magnetic skyrmions in frustrated magnets. Here we explore the skyrmion dynamics in a frustrated magnet based on the J 1-J 2-J 3 classical Heisenberg model explicitly by including the dipole-dipole interaction. The skyrmion energy acquires a helicity dependence due to the dipole-dipole interaction, resulting in the current-induced translational motion with a fixed helicity. The lowest-energy states are the degenerate Bloch-type states, which can be used for building the binary memory. By increasing the driving current, the helicity locking-unlocking transition occurs, where the translational motion changes to the rotational motion. Furthermore, we demonstrate that two skyrmions can spontaneously form a bound state. The separation of the bound state forced by a driving current is also studied. In addition, we show the annihilation of a pair of skyrmion and antiskyrmion. Our results reveal the distinctive frustrated skyrmions may enable viable applications in topological magnetism.

Suggested Citation

  • Xichao Zhang & Jing Xia & Yan Zhou & Xiaoxi Liu & Han Zhang & Motohiko Ezawa, 2017. "Skyrmion dynamics in a frustrated ferromagnetic film and current-induced helicity locking-unlocking transition," Nature Communications, Nature, vol. 8(1), pages 1-10, December.
    • Handle: RePEc:nat:natcom:v:8:y:2017:i:1:d:10.1038_s41467-017-01785-w
    DOI: 10.1038/s41467-017-01785-w
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