Superconductor spintronics: modeling spin and charge accumulation in out-of-equilibrium NIS junctions subjected to Zeeman magnetic fields

Abstract : We study the spin and charge accumulation in a superconductor when a normal-superconductor tunnel junction is subjected to a Zeeman magnetic field and taken out of equilibrium by applying either a DC or AC voltage bias. We focus on a configuration which allows one to measure non-locally the spin-accumulation using a second ferromagnetic electrode. Our main result is that, in the presence of an AC bias, the time average of the detected non-local signal is frequency dependent, and the frequency at which the saturation occurs is directly related to the inverse of the spin-relaxation time. For a DC bias we also address the effect of the spin accumulation in the normal leads and we investigate the out-of-equilibrium spin susceptibility of the SC, which we show to deviate drastically from its equilibrium value.
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New Journal of Physics, Institute of Physics: Open Access Journals, 2018, 20, pp.013014. 〈10.1088/1367-2630/aa9cc7〉
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Dernière modification le : mardi 12 juin 2018 - 12:51:21
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D. Chevallier, M. Trif, C. Dutreix, M. Guigou, C. H. L. Quay, et al.. Superconductor spintronics: modeling spin and charge accumulation in out-of-equilibrium NIS junctions subjected to Zeeman magnetic fields. New Journal of Physics, Institute of Physics: Open Access Journals, 2018, 20, pp.013014. 〈10.1088/1367-2630/aa9cc7〉. 〈hal-01716101〉

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