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arXiv 0811.2235cond-mat.mes-hallcond-mat.mtrl-sci
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(Ga,Mn)As中电流与畴壁运动的本征耦合

Intrinsic Coupling between Current and Domain Wall Motion in (Ga,Mn)As

Kjetil M. D Hals, Anh Kiet Nguyen, Arne Brataas

摘要:

我们考虑了电流感应畴壁运动,以及运动畴壁的感应电流。相关的Onsager系数表示的散射矩阵。不常见的是,在(Ga,Mn)As中,有效吉尔伯特阻尼系数$α_w$和有效面外自旋转移矩参数$β_w$由自旋轨道相互作用结合畴壁散射而不是散射外来杂质主导。数值计算给出了(Ga,Mn)As中的$α_w \sim 0.01$和$β_w \sim 1$.非常大的$β_w$参数允许实验检测的电流或电压引起的畴壁运动(Ga,Mn)As。

英文摘要:

We consider current-induced domain wall motion and, the reciprocal process, moving domain wall-induced current. The associated Onsager coefficients are expressed in terms of scattering matrices. Uncommonly, in (Ga,Mn)As, the effective Gilbert damping coefficient $α_w$ and the effective out-of-plane spin transfer torque parameter $β_w$ are dominated by spin-orbit interaction in combination with scattering off the domain wall, and not scattering off extrinsic impurities. Numerical calculations give $α_w \sim 0.01$ and $β_w \sim 1$ in dirty (Ga,Mn)As. The extraordinary large $β_w$ parameter allows experimental detection of current or voltage induced by domain wall motion in (Ga,Mn)As.

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