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arXiv 0905.4544cond-mat.mes-hallcond-mat.mtrl-sci
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自旋织构铁磁体中电流与磁化耦合动力学的流体力学理论

Hydrodynamic theory of coupled current and magnetization dynamics in spin-textured ferromagnets

Clement H. Wong, Yaroslav Tserkovnyak

摘要:

发展了金属铁磁体中共线自旋流与磁化动力学耦合的流体力学理论。集体自旋密度通过U(1)Berry相规范场耦合到自旋电流,该规范场由磁化的局部织构和动力学确定。我们确定唯象的耗散修正的运动方程的电子电流,其中包括一个耗散的自旋动力学所产生的磁化动力学和磁纹理相关的电阻率张量。磁性织构上的相互耗散、绝热自旋力矩遵循Onsager原理。我们调查的热涨落的影响,发现电子动力学有助于非本地吉尔伯特阻尼张量的Landau-Lifshitz-Gilbert方程的磁化强度。几个简单的例子,包括磁涡旋,螺旋,螺旋,详细分析,以证明一般原则。

英文摘要:

We develop the hydrodynamical theory of collinear spin currents coupled to magnetization dynamics in metallic ferromagnets. The collective spin density couples to the spin current through a U(1) Berry-phase gauge field determined by the local texture and dynamics of the magnetization. We determine phenomenologically the dissipative corrections to the equation of motion for the electronic current, which consist of a dissipative spin-motive force generated by magnetization dynamics and a magnetic texture-dependent resistivity tensor. The reciprocal dissipative, adiabatic spin torque on the magnetic texture follows from the Onsager principle. We investigate the effects of thermal fluctuations and find that electronic dynamics contribute to a nonlocal Gilbert damping tensor in the Landau-Lifshitz-Gilbert equation for the magnetization. Several simple examples, including magnetic vortices, helices, and spirals, are analyzed in detail to demonstrate general principles.

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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