Spin-Wave Doppler Shift by Magnon Drag in Magnetic Insulators
arXiv:2011.15008 · doi:10.1103/PhysRevLett.126.137202
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.
arXiv comment6 pages, 4 figures
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Cited by in corpus (7)
- Chirality as Generalized Spin-Orbit Interaction in Spintronics
- Efficient Gating of Magnons by Proximity Superconductors
- Observation of nonreciprocal magnon Hanle effect
- Observation of spin-wave moiré edge and cavity modes in twisted magnetic lattices
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- Theory of drift-enabled control in nonlocal magnon transport
- Nonlinear spin-Wave Doppler effect for flexible tuning of magnonic frequencies