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Spin-Wave Doppler Shift by Magnon Drag in Magnetic Insulators

MPS-Authors
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Yu,  T.
Theoretical Description of Pump-Probe Spectroscopies in Solids, Theory Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society;

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Sentef,  M. A.
Theoretical Description of Pump-Probe Spectroscopies in Solids, Theory Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society;

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Fulltext (public)

2011.15008.pdf
(Publisher version), 623KB

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Citation

Yu, T., Wang, C., Sentef, M. A., & Bauer, G. E. W. (2020). Spin-Wave Doppler Shift by Magnon Drag in Magnetic Insulators.


Cite as: http://hdl.handle.net/21.11116/0000-0007-7CE6-B
Abstract
Doppler shift of quasiparticle dispersion induced by charge currents is responsible for the critical supercurrents in superconductors and spin-wave instabilities by spin-transfer torque in metallic ferromagnets. Here we predict an analogous effect in thin films of magnetic insulators. A coherent spin current, excited by stripline microwaves, or a thermal magnon current, driven by a temperature gradient, can induce a Doppler shift that tilts the magnon dispersion in the spin-current direction. Around a critical driving strength, that is characterized by a spin-wave instability in the self-consistent mean-field treatment, the pumped magnon current reaches a maximum accompanied by a strong breaking of chiral pumping. The backaction of magnon currents on magnetic orders is therefore important for realizing large spin currents in low-dimensional magnonic devices.