Nonlinear magnetotransport in dual spin valves

Details Nonlinear magnetotransport in dual spin valves Nonlinear magnetotransport in dual spin valves

2010-04-08

arxiv.org/abs/1004.1439v2

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

Scientific paper

Recent experimental measurements of magnetoresistance in dual spin valves [A. Aziz et al., Phys. Rev. Lett. 103, 237203 (2009)] reveal some nonlinear features of transport, which have not been observed in other systems. We propose a phenomenological model describing current-dependent resistance (and giant magnetoresistance) in double spin valves. The model is based on a modified Valet-Fert approach, and takes into account the dependence of bulk/interface resistance and bulk/interface spin asymmetry parameters for the central magnetic layer on spin accumulation, and consequently on charge current. Such a nonlinear model accounts for recent experimental observations.

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