449 research outputs found
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 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.Comment: 6 pages, 3 figure
Mesoscopic oscillations of the conductance of disordered metallic samples as a function of temperature
We show theoretically and experimentally that the conductance of small
disordered samples exhibits random oscillations as a function of temperature.
The amplitude of the oscillations decays as a power law of temperature, and
their characteristic period is of the order of the temperature itself
Spin injection dependent metamagnetic transition
We define the metamagnetic phase transition of itinerant electrons controlled
by the spin injection mechanism. The current flow between a ferromagnetic metal
and a metamagnetic metal produces the non-equilibrium shift of chemical
potential for spin up and spin down electrons that acts as an effective
magnetic field driving the metamagnetic transition.Comment: 6 pages, 3 figure
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