Control of the polarity of magnetization vortex by torsion

Control of the polarity of magnetization vortex by torsion
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通过扭转控制磁化涡旋的极性

DOI:
10.1063/1.4847375
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发表时间:
2013-12
影响因子:
4
通讯作者:
方辉
方辉
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
方辉

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利用实空间相场模型研究了受扭转作用的圆形铁磁纳米点中涡旋极性的转换行为,该模型显式地考虑了磁化强度和机械应变之间的耦合。研究发现,当扭转符号与涡旋手性符号相反时,纳米点的涡旋极性可以通过扭转来改变,而当扭转符号与涡旋手性符号相同时,则不会发生改变。磁弹性耦合和退磁场在极性转换中起着决定性的作用,这涉及到磁化、应变和退磁之间的有趣相互作用。结果表明,除了磁场和电流外,还可以通过机械扭转来控制涡旋的极性。
The switching behavior of vortex polarity in a circular ferromagnetic nanodot subjected to torsion is investigated by using a real space phase field model, which explicitly includes the coupling between magnetization and mechanical strain. It is found that the vortex polarity of the nanodot can be switched by torsion when the sign of the torsion is opposite to that of vortex chirality whereas switching does not take place if the sign of torsion is the same as that of vortex chirality. The magneto-elastic coupling and demagnetization field play a decisive role in the polarity switching, which involves an intriguing interplay of magnetization, strain, and demagnetization. The results suggest another way to control vortex polarity by mechanical torsion other than magnetic field and electric current.
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