Spin-Wave Doppler Shift by Magnon Drag in Magnetic Insulators

Tao Yu, Chen Wang, Michael A. Sentef, Gerrit E.W. Bauer

Research output: Contribution to journalArticlepeer-review

Abstract

The Doppler shift of the quasiparticle dispersion by charge currents is responsible for the critical supercurrents in superconductors and instabilities of the magnetic ground state of metallic ferromagnets. Here we predict an analogous effect in thin films of magnetic insulators in which microwaves emitted by a proximity stripline generate coherent chiral spin currents that cause a Doppler shift in the magnon dispersion. The spin-wave instability is suppressed by magnon-magnon interactions that limit spin currents to values close to but below the threshold for the instability. The spin current limitations by the backaction of magnon currents on the magnetic order should be considered as design parameters in magnonic devices.

Original languageEnglish
Article number137202
JournalPhysical review letters
Volume126
Issue number13
DOIs
Publication statusPublished - 2021 Mar 30

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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