电流和磁场驱动磁涡旋的谐振子模型
Harmonic oscillator model for current- and field-driven magnetic vortices
摘要：
在实验中，自旋力矩和奥斯特场驱动的磁化动力学之间的区别仍然是一个悬而未决的问题。在这里，陀螺仪运动的电流和磁场驱动的小薄膜元件中的磁涡旋的分析计算和数值模拟研究。结果表明，在小谐激励下，涡核绕平衡位置作椭圆旋转。旋转的全局相位和半轴之间的比率由奥斯特场的频率和振幅以及自旋力矩确定。
英文摘要：
In experiments the distinction between spin-torque and Oersted-field driven magnetization dynamics is still an open problem. Here, the gyroscopic motion of current- and field-driven magnetic vortices in small thin-film elements is investigated by analytical calculations and by numerical simulations. It is found that for small harmonic excitations the vortex core performs an elliptical rotation around its equilibrium position. The global phase of the rotation and the ratio between the semi-axes are determined by the frequency and the amplitude of the Oersted field and the spin torque.
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