平面偏振器的非均匀性是零场自旋转移诱导涡旋振荡的一个原因
Non-uniformity of a planar polarizer as a reason of spin-transfer induced vortex oscillations at zero field
摘要：
我们讨论了一种可能的自旋转移诱导的自旋阀纳米结构的自由层中的涡旋振荡的机制，其中偏振层具有平面磁化。我们证明，如果这样的平面偏振器是基本上不均匀的，稳定的大振幅的回旋涡旋运动可以激发。极化器中的圆形磁化分布获得最佳的激发效率。在这种结构中，振荡的起始条件取决于涡旋的手征性，而不是其核心的方向。
英文摘要：
We discuss a possible mechanism of the spin-transfer induced oscillations of a vortex in the free layer of spin-valve nanostructures, in which the polarizer layer has a planar magnetization. We demonstrate that if such planar polarizer is essentially non-uniform, steady gyrotropic vortex motion with large amplitude can be excited. The best excitation efficiency is obtained for a circular magnetization distribution in the polarizer. In this configuration, the conditions for the onset of the oscillations depend on the vortex chirality but not on the direction of its core.
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