Current-induced spin-wave Doppler shift and attenuation in compensated ferrimagnets

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We theoretically and numerically study current-induced modification of ferrimagnetic spin-wave dynamics when an electrical current generates adiabatic and nonadiabatic spin-transfer torques. We find that the sign of the Doppler shift depends on the spin-wave handedness because the sign of spin polarization carried by spin waves depends on the spin-wave handedness. It also depends on the sign of the adiabatic-torque coefficient, originating from unequal contributions from two sublattices. For a positive nonadiabaticity of spin current, the attenuation lengths of both right- and left-handed spin waves increase when electrons move in the same direction with spin-wave propagation. Our result establishes a way to simultaneously measure important material parameters of a ferrimagnet, such as angular momentum compensation point, spin polarization, and nonadiabaticity using current-induced control of ferrimagnetic spin-wave dynamics.
Publisher
AMER PHYSICAL SOC
Issue Date
2021-01
Language
English
Article Type
Article
Citation

PHYSICAL REVIEW B, v.103, no.1, pp.014433

ISSN
2469-9950
DOI
10.1103/PhysRevB.103.014433
URI
http://hdl.handle.net/10203/281036
Appears in Collection
PH-Journal Papers(저널논문)
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