Non-equilibrium Spin Waves in Paramagnetic Metals

Details Non-equilibrium Spin Waves in Paramagnetic Metals Non-equilibrium Spin Waves in Paramagnetic Metals

2009-08-04

arxiv.org/abs/0908.0466v2

EPL 90 (2010) 67007

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

6 pages, 3 figures

Scientific paper

10.1209/0295-5075/90/67007

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.

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