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arXiv 1202.3450cond-mat.mes-hallcond-mat.mtrl-sci
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存在自旋霍尔效应时横向磁畴壁的电流感生运动

Current-induced motion of a transverse magnetic domain wall in the presence of spin Hall effect

Soo-Man Seo, Kyoung-Whan Kim, Jisu Ryu, Hyun-Woo Lee, Kyung-Jin Lee

摘要:

我们从理论上研究了双层纳米线中横向磁畴壁的电流诱导动力学,双层纳米线由铁磁体和非磁体组成,具有强的自旋轨道耦合。畴壁动力学的特征在于两个阈值电流密度,$J_{th}^{WB}$和$J_{th}^{REV}$,其中$J_{th}^{WB}$是畴壁的手性切换的阈值,$J_{th}^{REV}$是由自旋霍尔效应引起的反转畴壁运动的另一阈值。对于满足条件$J_{th}^{WB} > J_{th}^{REV}$和α> β(α为Gilbert阻尼常数,β为自旋力矩的非绝热性)的系统,具有一定手征性的畴壁可以在电流范围$J_{th}^{REV} < J < J_{th}^{WB}$内沿与电子流方向相反的方向高速运动。微磁模拟证实了分析结果的有效性。

英文摘要:

We theoretically study the current-induced dynamics of a transverse magnetic domain wall in bi-layer nanowires consisting of a ferromagnet on top of a nonmagnet having strong spin-orbit coupling. Domain wall dynamics is characterized by two threshold current densities, $J_{th}^{WB}$ and $J_{th}^{REV}$, where $J_{th}^{WB}$ is a threshold for the chirality switching of the domain wall and $J_{th}^{REV}$ is another threshold for the reversed domain wall motion caused by spin Hall effect. Domain walls with a certain chirality may move opposite to the electron-flow direction with high speed in the current range $J_{th}^{REV} < J < J_{th}^{WB}$ for the system designed to satisfy the conditions $J_{th}^{WB} > J_{th}^{REV}$ and α> β, where αis the Gilbert damping constant and βis the nonadiabaticity of spin torque. Micromagnetic simulations confirm the validity of analytical results.

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