Microscopic theory of magnon-drag thermoelectric transport in ferromagnetic metals

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8 Citations (Scopus)

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 Γ mag is obtained as the ratio between the magnon heat current and the electric charge current. We show that Γ mag = C magT 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·Å 3/2 for permalloy.

Original languageEnglish
Article number113602
Journaljournal of the physical society of japan
Volume81
Issue number11
DOIs
Publication statusPublished - 2012 Nov 1

Keywords

  • Electron-magnon interaction
  • Magnon drag
  • Peltier effect
  • Seebeck effect
  • Spin caloritronics
  • Spin current
  • Spintronics

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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