呼吸模型内转动惯量
Magnetic moment of inertia within the breathing model
摘要：
磁性器件的一个基本性质是磁开关中的弛豫速率，它强烈地依赖于磁化动力学的能量耗散和磁惯性。这两个参数通常被视为现象学实体。然而，最近，大量的努力已经致力于从第一原理获得吉尔伯特阻尼。相比之下，没有从头算研究，到目前为止，已复制的磁性材料的磁惯量的测量数据。在这封信中，我们提出并阐述了一个理论模型，用于计算的磁矩转动惯量的基础上的转矩-转矩相关模型。特别是，该方法已被应用到体bcc铁，面心立方钴和面心立方镍的紧束缚近似的框架和数值与最近的实验测量。理论结果从电子结构的角度阐明了转动惯量的物理来源。尽管转动惯量和阻尼是由自旋轨道耦合产生的，但我们的分析表明它们是由不同的电子结构机制引起的。
英文摘要：
An essential property of magnetic devices is the relaxation rate in magnetic switching which strongly depends on the energy dissipation and magnetic inertia of the magnetization dynamics. Both parameters are commonly taken as a phenomenological entities. However very recently, a large effort has been dedicated to obtain Gilbert damping from first principles. In contrast, there is no ab initio study that so far has reproduced measured data of magnetic inertia in magnetic materials. In this letter, we present and elaborate on a theoretical model for calculating the magnetic moment of inertia based on the torque-torque correlation model. Particularly, the method has been applied to bulk bcc Fe, fcc Co and fcc Ni in the framework of the tight-binding approximation and the numerical values are comparable with recent experimental measurements. The theoretical results elucidate the physical origin of the moment of inertia based on the electronic structure. Even though the moment of inertia and damping are produced by the spin-orbit coupling, our analysis shows that they are caused by undergo different electronic structure mechanisms.
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