磁化动力学中的阻尼理论，消除神话并指出前进的方向
Theory of damping in magnetization dynamics, dispelling a myth and pointing a way forward
摘要：
理论家们普遍认为，对于T=0的纯金属，磁化动力学中的吉尔伯特阻尼参数α是无穷大的。明确指出了导致这种信念的基本错误，并根据铁磁共振谱的洛伦兹线型统一看待所用的各种计算方法。提出了一个α的通用扭矩公式，作为处理非均匀材料如合金、化合物和层状结构的良好起点。局域自旋密度泛函理论提供了一个简单的物理图像，在铁磁共振中的非均匀进动锥角，这种不均匀性如何有助于阻尼。在互补多体理论中，这一贡献由对转矩-转矩响应函数的顶点修正给出。
英文摘要：
There is a widely-held belief amongst theoreticians that the Gilbert damping parameter α in magnetization dynamics is infinite for a pure metal at T=0. The basic error leading to this belief is pointed out explicitly and the various methods of calculation used are viewed in a unified way based on the Lorentzian lineshape of ferromagnetic resonance spectra. A general torque formula for α is proposed as a good starting-point for treating inhomogeneous materials such as alloys, compounds and layered structures. Local spin density functional theory provides a simple physical picture, in terms of a non-uniform precessional cone angle in ferromagnetic resonance, of how such inhomogeneity contributes to the damping. In a complementary many-body theory this contribution is given by a vertex correction to the torque-torque response function.
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