Current fluctuations in a spin filter with paramagnetic impurities

Abstract

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 $eV/\hslash$.

arXiv comment6 pages, 2 figures

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• Current noise from a magnetic moment in a helical edge
• Measuring Spin Accumulations with Current Noise
• What can we learn about the dynamics of transported spins by measuring shot noise in spin-orbit-coupled nanostructures?
• Spin and Charge Shot Noise in Mesoscopic Spin Hall Systems