Microscopic Theory of Magnon-Drag Thermoelectric Transport in Ferromagnetic Metals
Microscopic Theory of Magnon-Drag Thermoelectric Transport in Ferromagnetic Metals
复制标题
铁磁金属中磁振阻力热电输运的微观理论
DOI：
--
复制
发表时间：
2012
期刊：
影响因子：
--
通讯作者：
A. Sakuma
中科院分区：
文献类型：
--
作者：
D. Miura;A. Sakuma
本文从理论上研究了铁磁金属中的磁振子拖曳Peltier效应和Seebeck效应。一个磁振子热流描述微扰从微观角度来看，相对于电子-磁振子相互作用和电场。然后，获得磁振子阻力Peltier系数$Pi_MAG$作为磁振子热流和电荷电流之间的比率。我们证明了在低温T$下$Pi_MAG=C_MAG T^{5/2}$，系数C_MAG$与电导率的自旋极化$P$成正比，并且当$C_MAG 0$时$P>0$。从磁振子拖曳Peltier效应的实验结果，我们估计的电子-磁振子相互作用的强度约为0.3 eV$cdotAA^{3/2}$坡莫合金。
A theoretical study of the magnon-drag Peltier and Seebeck effects in ferromagnetic metals is presented. A magnon heat current is described perturbatively from the microscopic viewpoint with respect to electron--magnon interactions and the electric field. Then, the magnon-drag Peltier coefficient $Pi_MAG$ is obtained as the ratio between the magnon heat current and the electric charge current. We show that $Pi_MAG=C_MAG T^{5/2}$ at a low temperature $T$; that the coefficient $C_MAG$ is proportional to the spin polarization $P$ of the electric conductivity; and that $P>0$ for $C_MAG 0$. From experimental results for magnon-drag Peltier effects, we estimate that the strength of the electron--magnon interaction is about 0.3 eV$cdotAA^{3/2}$ for permalloy.