非共线自旋阀弹道力矩的Landauer理论
Landauer theory of ballistic torkances in non-collinear spin valves
摘要：
本文提出了一种弹道式非共线自旋阀中电压诱导自旋转移力矩的理论。在一个铁磁层上的torkance表示在整个自旋阀的散射系数，在类似的朗道电导公式。该理论被应用到Co/Cu/Ni（001）基系统中，预测了作为Ni厚度的函数的Ni-torkance的长程振荡。振荡代表了一种新的量子尺寸效应，由于非共线的磁性结构。torkance的振荡行为与电导的厚度无关的趋势形成对比。
英文摘要：
We present a theory of voltage-induced spin-transfer torques in ballistic non-collinear spin valves. The torkance on one ferromagnetic layer is expressed in terms of scattering coefficients of the whole spin valve, in analogy to the Landauer conductance formula. The theory is applied to Co/Cu/Ni(001)-based systems where long-range oscillations of the Ni-torkance as a function of Ni thickness are predicted. The oscillations represent a novel quantum size effect due to the non-collinear magnetic structure. The oscillatory behavior of the torkance contrasts a thickness-independent trend of the conductance.
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