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arXiv 1502.02068cond-mat.mes-hall
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金属铁磁体Gilbert阻尼的微观理论

Microscopic theory of Gilbert damping in metallic ferromagnets

A. T. Costa, R. B. Muniz

摘要:

我们提出了一个微观理论的磁化弛豫在纳米尺度的金属铁磁体的动态自旋响应矩阵的基础上存在的自旋轨道耦合。我们的方法允许计算的自旋激发阻尼率,即使是完美的结晶系统,现有的微观方法失败。我们表明,弛豫特性是不完全由横向磁化率单独确定,阻尼率具有不可忽略的频率依赖性在实验相关的情况下。我们的结果表明,标准的Landau-Lifshitz-Gilbert现象并不总是适合描述存在强自旋轨道耦合的金属纳米结构的自旋动力学。

英文摘要:

We present a microscopic theory for magnetization relaxation in metallic ferromagnets of nanoscopic dimensions that is based on the dynamic spin response matrix in the presence of spin-orbit coupling. Our approach allows the calculation of the spin excitation damping rate even for perfectly crystalline systems, where existing microscopic approaches fail. We demonstrate that the relaxation properties are not completely determined by the transverse susceptibility alone, and that the damping rate has a non-negligible frequency dependence in experimentally relevant situations. Our results indicate that the standard Landau-Lifshitz-Gilbert phenomenology is not always appropriate to describe spin dynamics of metallic nanostructure in the presence of strong spin-orbit coupling.

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