Gyration eigenfrequencies of vertically coupled vortices in layered magnetic disks

Gyration eigenfrequencies of vertically coupled vortices in layered magnetic disks
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层状磁盘中垂直耦合涡旋的回转特征频率

DOI:
10.1063/1.4903039
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发表时间:
2014-12
影响因子:
3.2
通讯作者:
Wu, Y. Z.
Wu, Y. Z.
中科院分区:
物理与天体物理3区
文献类型:
--
作者:
Luo, Y. M.;Zhou, C.;Won, C.;Wu, Y. Z.

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采用数值模拟和解析计算相结合的方法研究了两个纳米磁性圆盘中垂直耦合涡的动力学特性。当两个涡旋的核心极化平行时,对应于两个涡旋的视复运动存在两个不同的法向模态和两个不同的特征频率。相反,当磁芯极化相反时,只存在具有单一特征频率的简并模态。我们证明了旋转特征频率可以通过改变耦合强度,即圆盘之间的距离来调谐。基于解析模型,可以很好地理解正常模态和特征频率对相对涡态构型的依赖关系。
The dynamic properties of vertically coupled vortices in two magnetic nanodisks were studied using numerical simulations and analytical calculations. If the core polarizations of the two vortices are parallel, there exist two distinct normal modes with two distinct eigenfrequencies corresponding to the apparent complex motions of two vortices. Conversely, only a degenerate mode with a single eigenfrequency exists when the cores have opposite polarization. We show that the gyration eigenfrequencies can be tuned by changing the coupling strength, i.e., the separation between the disks. The dependence of the normal modes and the eigenfrequencies on the relative vortex-state configuration can be well understood based on the analytic model.
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发表时间: 2012-05
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