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arXiv 1111.1216cond-mat.mes-hallquant-ph
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具有Rashba相互作用的铁磁薄膜中的扩散自旋动力学

Diffusive spin dynamics in ferromagnetic thin films with a Rashba interaction

Xuhui Wang, Aurelien Manchon

摘要:

在铁磁金属层中,在Rashba自旋轨道相互作用和磁性的存在下,得到耦合的电荷和自旋扩散方程。由Rashba场引起的磁化强度和非平衡自旋密度之间的错位引起作用于铁磁序参量的Rashba自旋力矩。在一般形式中,我们发现Rashba扭矩由面内和面外分量组成,即$\bm{T}=T_{\bot}\hat{\bm{y}}\times{\hat{\bm m}}+T_{\parallel}{\hat{\bm m}}\times({\hat{\bm y}}\times{\hat{\bm m}})$。对二维纳米线的数值模拟讨论了扩散对Rashba扭矩的影响,其揭示了细线的比率$T_{\parallel}/T_{\bot}$的大的增强。我们的理论提供了一个解释的机制,驱动在一个单一的铁磁体在最近的实验中观察到的磁化翻转。

英文摘要:

In a ferromagnetic metal layer, the coupled charge and spin diffusion equations are obtained in the presence of both Rashba spin-orbit interaction and magnetism. The mis-alignment between the magnetization and the non-equilibrium spin density induced by the Rashba field gives rise to Rashba spin torque acting on the ferromagnetic order parameter. In a general form, we find that the Rashba torque consists of both in-plane and out-of-plane components, ie $\bm{T}=T_{\bot}\hat{\bm{y}}\times{\hat{\bm m}}+T_{\parallel}{\hat{\bm m}}\times({\hat{\bm y}}\times{\hat{\bm m}})$. Numerical simulations on a two dimensional nano-wire discuss the impact of diffusion on the Rashba torque, which reveals a large enhancement to the ratio $T_{\parallel}/T_{\bot}$ for thin wires. Our theory provides an explanation to the mechanism that drives the magnetization switching in a single ferromagnet as observed in the recent experiments.

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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