Nonlinear magnetic vortex gyration
Nonlinear magnetic vortex gyration
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DOI：
10.1103/physrevb.85.144417
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发表时间：
2012-04-20
影响因子：
3.7
通讯作者：
Meier, Guido
中科院分区：
文献类型：
--
作者：
Drews, Andre;Krueger, Benjamin;Meier, Guido
通过微磁模拟、解析计算和宽带铁磁共振测量，研究了软磁方中磁涡的非线性运动。增加交变的单向自旋电流和磁场的幅度，使轨迹的形状接近样品的形状，并移动涡旋旋转的共振频率。我们发现，是磁性元件的厚度决定了共振频率是向红移还是向蓝移。基于Thiele方程的非线性运动方程再现了模拟和测量结果。
Nonlinear motion of magnetic vortices in soft magnetic squares is investigated by micromagnetic simulations, analytical calculations, and broadband ferromagnetic resonance measurements. Increasing amplitudes of alternating unidirectional spin currents and magnetic fields cause the shapes of the trajectories to approach the shape of the sample and shift the resonance frequency of vortex gyration. We show that it is the thickness of the magnetic element that determines whether the resonance frequency shifts to the red or to the blue. A nonlinear equation of motion based on the Thiele equation reproduces the simulated and measured results.