Current-induced dynamics in noncollinear dual spin valves
Current-induced dynamics in noncollinear dual spin valves
复制标题
DOI：
10.1103/physrevb.80.174404
复制
发表时间：
2009-07
影响因子：
3.7
通讯作者：
P. Baláž;M. Gmitra;J. Barnaś
中科院分区：
文献类型：
--
作者：
P. Baláž;M. Gmitra;J. Barnaś
从理论上考虑了自由磁层位于两个磁矩固定的磁膜之间的自旋阀纳米柱的自旋传递力矩和电流诱导自旋动力学。计算了扩散输运极限下的自旋传递转矩与磁组态的关系。结果表明，最外层磁层的非共线磁构型对中心自由层的自旋力矩和自旋动力学有很强的影响。利用宏观自旋模拟对由不同磁层组成的自旋阀的自由层自旋动力学进行了预测。我们还提出了非共线磁结构下临界电流的计算公式，表明临界电流的大小可以比典型的单自旋阀小几倍。
Spin-transfer torque and current-induced spin dynamics in spin-valve nanopillars with the free magnetic layer located between two magnetic films of fixed magnetic moments is considered theoretically. The spin-transfer torque in the limit of diffusive spin transport is calculated as a function of magnetic configuration. It is shown that noncollinear magnetic configuration of the outermost magnetic layers has a strong influence on the spin torque and spin dynamics of the central free layer. Employing macrospin simulations we make some predictions on the free layer spin dynamics in spin valves composed of various magnetic layers. We also present a formula for critical current in noncollinear magnetic configurations, which shows that the magnitude of critical current can be several times smaller than that in typical single spin valves.