受限层结条件下的涡动力学
Vortex dynamics in confined stratified conditions
摘要：
我们报告的线性自旋动力学的涡旋状态的坡莫合金点进行分层（磁场）场。我们证明了实验和模拟的存在两个不同的动态制度对应的涡稳定和亚稳态。圆柱对称性的破坏导致了在稳定状态下本征模的频率分裂和在涡旋成核场上方的亚稳态下新本征模的出现。在亚稳态的动态响应强烈地依赖于外部射频泵浦和偏置磁场的相对取向。这些发现可能是相关的不同的涡状态在封闭和分层条件。
英文摘要：
We report on linear spin dynamics in the vortex state of the Permalloy dots subjected to stratified (magnetic) field. We demonstrate experimentally and by simulations the existence of two distinct dynamic regimes corresponding to the vortex stable and metastable states. Breaking cylindrical symmetry leads to unexpected eigenmodes frequency splitting in the stable state and appearance of new eigenmodes in the metastable state above the vortex nucleation field. Dynamic response in the metastable state strongly depends on relative orientation of the external rf pumping and the bias magnetic fields. These findings may be relevant for different vortex states in confined and stratified conditions.
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