Magnon instability driven by heat current in magnetic bilayers

Yuichi Ohnuma, Hiroto Adachi, Eiji Saitoh, Sadamichi Maekawa

    Research output: Contribution to journalArticlepeer-review

    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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