导电铁磁体中的Gilbert阻尼I：Kohn-Sham理论和原子尺度的非均匀性
Gilbert Damping in Conducting Ferromagnets I: Kohn-Sham Theory and Atomic-Scale Inhomogeneity
摘要：
基于自旋密度泛函理论（SDFT）和Kohn-Sham准粒子轨道的描述，导出了巡游电子铁磁体的Gilbert阻尼系数α_G的近似表达式。我们认为，在一个表达式中，磁化强度波动的耦合粒子-空穴过渡的加权自旋依赖的理论的交换相关势的一部分，一个量，它有很大的空间变化的原子长度尺度。我们对α_G的SDFT结果与先前提出的自旋矩相关函数表达式密切相关。
英文摘要：
We derive an approximate expression for the Gilbert damping coefficient α_G of itinerant electron ferromagnets which is based on their description in terms of spin-density-functional-theory (SDFT) and Kohn-Sham quasiparticle orbitals. We argue for an expression in which the coupling of magnetization fluctuations to particle-hole transitions is weighted by the spin-dependent part of the theory's exchange-correlation potential, a quantity which has large spatial variations on an atomic length scale. Our SDFT result for α_G is closely related to the previously proposed spin-torque correlation-function expression.
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