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

Xichao Zhang, Jing Xia, Yan Zhou (), Xiaoxi Liu, Han Zhang and Motohiko Ezawa ()
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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

Nature Communications, 2017, vol. 8, issue 1, 1-10

Abstract: 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.

Date: 2017
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DOI: 10.1038/s41467-017-01785-w

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