Spin-Transfer Torque and Dynamics
Spin-Transfer Torque and Dynamics
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DOI：
10.1007/10938171_7
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发表时间：
2006
期刊：
影响因子：
--
通讯作者：
M. Stiles;J. Miltat
中科院分区：
文献类型：
--
作者：
M. Stiles;J. Miltat
磁性多层膜中的电流是自旋极化的，并且可以携带足够的角动量，从而在薄磁性层中引起磁反转并引起稳定的磁化进动。自旋的流动取决于自旋相关的输运性质，如导电性、界面电阻和磁性多层膜中的自旋翻转散射。当电流携带的电子自旋与磁性层相互作用时，交换相互作用导致自旋和磁化之间的扭矩。当电流足够大时，由这种相互作用产生的转矩激励磁化。定性特征的动态，从电流引起的扭矩被捕获的一个简单的模型中，该层的磁化被假定为是均匀的。甚至更大的协议结果时，有限的温度效应包括在内，并允许磁化在整个薄膜中变化。
AbstractThe currents in magnetic multilayers are spin polarized and can carry enough angular momentum that they can cause magnetic reversal and induce stable precession of the magnetization in thin magnetic layers. The flow of spins is determined by the spin-dependent transport properties, like conductivity, interface resistance, and spin-flip scattering in the magnetic multilayer. When an electron spin carried by the current interacts with a magnetic layer, the exchange interaction leads to torques between the spin and the magnetization. The torque that results from this interaction excites the magnetization when the current is large enough. The qualitative features of the dynamics that result from current-induced torques are captured by a simple model in which the magnetization of the layer is assumed to be uniform. Even greater agreement results when finite temperature effects are included and the magnetization is allowed to vary throughout the film.