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


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.

SUBMITTER: Zhang X 

PROVIDER: S-EPMC5700181 | biostudies-literature | 2017 Nov

REPOSITORIES: biostudies-literature

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

Zhang Xichao X   Xia Jing J   Zhou Yan Y   Liu Xiaoxi X   Zhang Han H   Ezawa Motohiko M  

Nature communications 20171123 1


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 <sub>1</sub>-J <sub>2</sub>-J <sub>3</sub> 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  ...[more]

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