自旋转移的广义边界条件
Generalized Boundary Conditions for Spin Transfer
摘要：
我们开发了一个全面的描述静态和动态自旋转移扭矩之间的正常金属和磁性材料的界面。后者的具体例子包括铁磁体、共线和非共线反铁磁体、一般亚铁磁体和自旋玻璃。我们研究了交换主导的相互作用的极限，使得整个系统在自旋空间中是各向同性的，除了一个可能的破缺序。一个一般的这样的接口产生三个系数（对应于三个独立的发电机的旋转）概括了完善的概念的自旋混合电导，这属于共线的情况下。我们开发了一个非平衡热力学描述新兴的界面自旋转移及其对集体自旋动力学的影响，同时绕过通常的讨论自旋电流和净自旋动力学。相反，我们的重点是耗散和工作的界面。基于微观散射矩阵的表达式推导出广义自旋转移系数。
英文摘要：
We develop a comprehensive description of static and dynamic spin-transfer torque at interfaces between a normal metal and a magnetic material. Specific examples of the latter include ferromagnets, collinear and noncollinear antiferromagnets, general ferrimagnets, and spin glasses. We study the limit of the exchange-dominated interactions, so that the full system is isotropic in spin space, apart from a possible symmetry-breaking order. A general such interface yields three coefficients (corresponding to three independent generators of rotations) generalizing the well-established notion of the spin-mixing conductance, which pertains to the collinear case. We develop a nonequilibrium thermodynamic description of the emerging interfacial spin transfer and its effect on the collective spin dynamics, while circumventing the usual discussion of spin currents and net spin dynamics. Instead, our focus is on the dissipation and work effectuated by the interface. Microscopic scattering-matrix based expressions are derived for the generalized spin-transfer coefficients.
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