Spin-transfer excitations of permalloy nanopillars for large applied currents
Spin-transfer excitations of permalloy nanopillars for large applied currents
复制标题
大电流作用下坡莫合金纳米柱的自旋转移激发
DOI：
10.1103/physrevb.72.064430
复制
发表时间：
2005
影响因子：
3.7
通讯作者：
Daniel C. Ralph
中科院分区：
文献类型：
--
作者：
S. Kiselev;J. Sankey;I. Krivorotov;N. Emley;A. G. F. Garcia;R. Buhrman;Daniel C. Ralph
使用微波频率电阻振荡的光谱测量，我们确定的室温相图薄坡莫合金/铜/厚坡莫合金多层样品的直流自旋极化电流的扭矩所造成的磁激发。我们扩展到更大的电流值比以前报道的测量。我们发现了几个额外的模式，我们能够识别厚磁层以及薄的运动。在多个频率的微波谱峰表明，空间不均匀的动力学状态在某些情况下可能是重要的。我们比较了实验相图与简单的理论模型，并取得了很好的定性协议。
Using measurements of the spectra of microwave-frequency resistance oscillations, we determine the roomtemperature phase diagram of magnetic excitations caused by torques from dc spin-polarized currents in thin permalloy/copper/thick permalloy multilayer samples. We extend the measurements to larger values of current than have been reported previously. We find several additional modes that we are able to identify with motion of the thick magnetic layer as well as the thin one. Peaks in the microwave spectra at multiple frequencies suggest that spatially nonuniform dynamical states can be important in some circumstances. We compare the experimental phase diagram with simple theoretical models and achieve a good qualitative agreement.