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Microscopic Theory of Magnon-Drag Thermoelectric Transport in Ferromagnetic Metals

Authors
  • Miura, Daisuke
  • Sakuma, Akimasa
Type
Published Article
Publication Date
Oct 29, 2012
Submission Date
Sep 04, 2012
Identifiers
DOI: 10.1143/JPSJ.81.113602
Source
arXiv
License
Yellow
External links

Abstract

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 $C_\MAG<0$, 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$\cdot\AA^{3/2}$ for permalloy.

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