坡莫合金/Bi $_2$ Se $_3$类异质结构中的大振幅涡旋
Large amplitude vortex gyration in Permalloy/Bi$_2$Se$_3$-like heterostructures
摘要：
我们考虑了在坡莫合金纳米盘中大振幅回旋涡核进动的激发，其产生的力矩来自于沿坡莫合金/Bi $_2$ Se $_3$异质结构界面流动的面内微波电流，其中观察到巨大的电荷-自旋转换比\cite{Mellnik-2014}。我们认为，分析和微磁建模的微波电流的频率和幅度上的这种激励的依赖性。证明了涡旋动力学和朗道相变理论的相似性。这些发现开启了用远低于任何其他方法的电流密度激发旋向涡旋运动的可能性。
英文摘要：
We consider the excitation of large amplitude gyrotropic vortex core precession in a Permalloy nanodisk by the torques originating from the in-plane microwave current flowing along the interface of the Permalloy/Bi$_2$Se$_3$ heterostructures, in which the huge charge-to-spin conversion ratio is observed \cite{Mellnik-2014}. We consider analytically and by micromagnetic modelling the dependence of this excitation on the frequency and magnitude of the microwave current. The analogies of the vortex dynamics and the Landau phase transitions theory is demonstrated. These findings open the possibility to excite gyrotropic vortex motion with the current densities far lower than by any other means.
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