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arXiv 1302.4744cond-mat.mes-hall
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自旋轨道耦合铁磁体中手征敏感畴壁运动

Chirality Sensitive Domain Wall Motion in Spin-Orbit Coupled Ferromagnets

Jacob Linder

摘要:

利用拉格朗日形式,我们解析求解了具有Rashba自旋轨道耦合的铁磁体中电流感生畴壁动力学的运动方程。在考虑非平衡传导电子自旋密度、吉尔伯特阻尼和Rashba相互作用参数的影响下,给出了畴壁速度的精确解。我们明确地表明,自旋轨道相互作用的影响可以定性地从非绝热自旋扭矩的作用不同的意义上说,前者是敏感的畴壁的手征,而后者不是:畴壁速度显示重入行为时,改变畴壁的手征。这可以用来在实验上区分自旋轨道和非绝热对壁面速度的贡献。可达到的畴壁速度的定量估计给出,实验相关的一组参数的系统的基础上。

英文摘要:

Using the Lagrangian formalism, we solve analytically the equations of motion for current-induced domain-wall dynamics in a ferromagnet with Rashba spin-orbit coupling. An exact solution for the domain wall velocity is provided, including the effect of non-equilibrium conduction electron spin-density, Gilbert damping, and the Rashba interaction parameter. We demonstrate explicitly that the influence of spin-orbit interaction can be qualitatively different from the role of non-adiabatic spin-torque in the sense that the former is sensitive to the chirality of the domain wall whereas the latter is not: the domain wall velocity shows a reentrant behavior upon changing the chirality of the domain wall. This could be used to experimentally distinguish between the spin-orbit and non-adiabatic contribution to the wall speed. A quantitative estimate for the attainable domain wall velocity is given, based on an experimentally relevant set of parameters for the system.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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