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arXiv 1303.6458cond-mat.mes-hall
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具有自旋霍尔效应的电流驱动畴壁运动:阈值电流密度的降低

Current-driven domain wall motion with spin Hall effect: Reduction of threshold current density

Jisu Ryu, Kyung-Jin Lee, Hyun-Woo Lee

摘要:

我们从理论上研究了自旋霍尔效应和非本征钉扎势共同作用下电流驱动的畴壁运动。自旋霍尔效应主要影响钉扎势中畴壁进动的阻尼比。当钉扎电位不太强时,这导致具有一定极性的畴壁的脱钉的阈值电流密度显著降低。我们还提出了一种方法来区分自旋霍尔效应引起的自旋转移力矩从一个由Rashba自旋轨道耦合实验。

英文摘要:

We theoretically study the current-driven domain wall motion in the presence of both the spin Hall effect and an extrinsic pinning potential. The spin Hall effect mainly affects the damping ratio of the domain wall precession in the pinning potential. When the pinning potential is not too strong, this results in a significant reduction of a threshold current density for the depinning of a domain wall with certain polarity. We also propose one way to distinguish the spin Hall effect induced spin-transfer torque from the one induced by the Rashba spin-orbit coupling experimentally.

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