Magnon instability driven by heat current in magnetic bilayers

Yuichi Ohnuma, Hiroto Adachi, Eiji Saitoh, Sadamichi Maekawa

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

We theoretically demonstrate that, in a ferromagnet/paramagnet bilayer, a magnon instability accompanied by a gigahertz microwave emission can be driven simply by means of a temperature bias. Employing many-body theory for investigating the effects of a phonon heat current on the magnon lifetime, we show that the magnon instability occurs upon the suppression of the umklapp scattering at low temperatures, leading to microwave emission. The present finding provides crucial information about the interplay of spin current and heat current.

Original languageEnglish
Article number224404
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume92
Issue number22
DOIs
Publication statusPublished - Dec 2 2015

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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