Non-equilibrium spin waves in paramagnetic metals

We theoretically study the effect of exchange interaction on the non-equilibrium spin waves in disordered paramagnetic metals under the spin injection condition. We show that the gapless spectrum of spin waves, describing the spin precession in the absence of the applied magnetic field, changes sign...

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Bibliographic Details
Published in:Europhysics letters 2010-06, Vol.90 (6), p.67007
Main Authors: Zyuzin, A. A, Yu. Zyuzin, A
Format: Article
Language:English
Subjects:
71.27.+a
72.25.Hg
75.30.Ds
Damping
Electromagnetic fields
Ferromagnetism
Inverse
Magnetic fields
Precession
Spin waves
Wave propagation
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Summary:We theoretically study the effect of exchange interaction on the non-equilibrium spin waves in disordered paramagnetic metals under the spin injection condition. We show that the gapless spectrum of spin waves, describing the spin precession in the absence of the applied magnetic field, changes sign to negative on the paramagnetic side near the ferromagnet-paramagnet phase transition. The damping of spin waves is small in the limit when electron-electron exchange energy is larger than the inverse electron mean free time, while in the opposite limit the propagation of spin waves is strongly suppressed. We discuss the amplification of the electromagnetic field by the non-equilibrium spin waves.
ISSN:0295-5075
1286-4854
DOI:10.1209/0295-5075/90/67007