Spin-Wave Doppler Shift by Magnon Drag in Magnetic Insulators

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

研究成果: Article査読

抄録

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.

本文言語English
論文番号137202
ジャーナルPhysical review letters
126
13
DOI
出版ステータスPublished - 2021 3 30

ASJC Scopus subject areas

  • 物理学および天文学(全般)

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