Current fluctuations in a spin filter with paramagnetic impurities

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K. E. Nagaev^1,2 and L. I. Glazman¹
¹W. I. Fine Theoretical Physics Institute, University of Minnesota, Minneapolis, Minnesota 55455, USA
²Institute of Radioengineering and Electronics, Russian Academy of Sciences, Mokhovaya Ulica 11, 125009 Moscow, Russia

Received 30 October 2005; published 15 February 2006

Weanalyze the frequency dependence of shot noise in a spinfilter consisting of a normal grain and ferromagnetic electrodes separatedby tunnel barriers. The source of frequency-dependent noise is randomspin-flip electron scattering that results from spin-orbit interaction and magneticimpurities. Though the latter mechanism does not contribute to theaverage current, it contributes to the noise and leads toits dispersion at frequencies of the order of the Korringarelaxation rate. Under nonequilibrium conditions, this rate is proportional tothe applied bias V, but parametrically smaller than eV/ [h-bar] .

URL:	http://link.aps.org/doi/10.1103/PhysRevB.73.054423
DOI:	10.1103/PhysRevB.73.054423
PACS:	73.23.-b; 05.40.-a; 72.70.+m; 02.50.-r 73.23.-b Electronic transport in mesoscopic systems 05.40.-a Fluctuation phenomena, random processes, noise, and Brownian motion 72.70.+m Noise processes and phenomena in electronic transport 02.50.-r Probability theory, stochastic processes, and statistics YEAR: 2006
KEYWORDS:	ferromagnetism, paramagnetism, electrodes, magnetic impurities, shot noise, spin-orbit interactions, current fluctuations

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