Skyrmion dynamics in a frustrated ferromagnetic film and current-induced helicity locking-unlocking transition.
Skyrmion dynamics in a frustrated ferromagnetic film and current-induced helicity locking-unlocking transition.
复制标题
受挫铁磁薄膜中的斯格明子动力学和电流感应螺旋性锁定-解锁转变
DOI:
10.1038/s41467-017-01785-w
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发表时间:
2017-11-23
影响因子:
16.6
通讯作者:
Ezawa M
中科院分区:
文献类型:
--
作者:
Zhang X;Xia J;Zhou Y;Liu X;Zhang H;Ezawa M
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 theJ1-J2-J3classical 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.
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影响因子:
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通讯作者:
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