Oscillation frequency of magnetic vortex induced by spin-polarized current in a confined nanocontact structure
Oscillation frequency of magnetic vortex induced by spin-polarized current in a confined nanocontact structure
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DOI：
10.1063/1.4764059
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发表时间：
2012-11
影响因子：
3.2
通讯作者：
Yan Liu;Huanan Li;Yong Hu;A. Du
中科院分区：
文献类型：
--
作者：
Yan Liu;Huanan Li;Yong Hu;A. Du
通过微磁学模拟和解析计算，研究了面外自旋极化电流通过纳米接触驱动坡莫合金纳米点中磁涡旋回旋运动的振荡频率.分析结果由Thiele方程计算，其中考虑了与自旋转移力矩相对应的力和伴随电流的奥斯特场。给出了振荡频率随涡核位置、纳米接触半径和电流密度的变化曲线。与分析计算和微磁模拟的良好协议。
We studied the oscillation frequency associated with gyrotropic motion of magnetic vortex in a Permalloy nanodot driven by an out-of-plane spin-polarized current injected through a nanocontact by micromagnetic simulations and analytical calculations. The analytical results were calculated by the Thiele's equation, where both the forces corresponding to the spin-transfer-torque and the Oersted field accompanying the current were taken into account. Variation curves of oscillation frequency with vortex core position, nanocontact radius, and current density were given. Good agreement with analytical calculations and micromagnetic simulations was found.