Current fluctuations in a spin filter with paramagnetic impurities

Details Current fluctuations in a spin filter with paramagnetic impurities Current fluctuations in a spin filter with paramagnetic impurities

2005-10-30

arxiv.org/abs/cond-mat/0510819v2

Phys. Rev. B 73, 054423 (2006)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

6 pages, 2 figures

Scientific paper

10.1103/PhysRevB.73.054423

We analyze the frequency dependence of shot noise in a spin filter consisting of a normal grain and ferromagnetic electrodes separated by tunnel barriers. The source of frequency-dependent noise is random spin-flip electron scattering that results from spin-orbit interaction and magnetic impurities. Though the latter mechanism does not contribute to the average current, it contributes to the noise and leads to its dispersion at frequencies of the order of the Korringa relaxation rate. Under nonequilibrium conditions, this rate is proportional to the applied bias $V$, but parametrically smaller than $eV/\hbar$.

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