arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1209.0685cond-mat.mes-hallcond-mat.other
收藏

铁磁金属中磁振子拖曳热电输运的微观理论

Microscopic Theory of Magnon-Drag Thermoelectric Transport in Ferromagnetic Metals

Daisuke Miura, Akimasa Sakuma

摘要:

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,获得作为磁振子热电流与电荷电流之间的比率的磁振子阻力珀耳帖系数$Π_\MAG$。结果表明,在低温下$T$,极化率系数$C_\MAG$与电导率的自旋极化率$P$成正比,而对于$C_\MAG>0$,极化率系数$P<0$与$C_\MAG<0$的极化率$P>0$成正比.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的$\cdotÅ^{3/2}$坡莫合金。

英文摘要:

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 $Π_\MAG$ is obtained as the ratio between the magnon heat current and the electric charge current. We show that $Π_\MAG=C_\MAG T^{5/2}$ 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 $C_\MAG<0$, but $P<0$ 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$\cdotÅ^{3/2}$ for permalloy.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑