Suppression of Giant Magnetoresistance by a superconducting contact

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We predict that current perpendicular to the plane (CPP) giant magnetoresistance (GMR) in a phase-coherent magnetic multilayer is suppressed when one of the contacts is superconducting. This is a consequence of a superconductivity-induced magneto-resistive (SMR) effect, whereby the conductance of the ferromagnetically aligned state is drastically reduced by superconductivity. To demonstrate this effect, we compute the GMR ratio of clean (Cu/Co)_nCu and (Cu/Co)_nPb multilayers, described by an ab-initio spd tight binding Hamiltonian. By analyzing a simpler model with two orbitals per site, we also show that the suppression survives in the presence of elastic scattering by impurities.
5 pages, 4 figures. Submitted to PRL

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Mesoscale and Nanoscale Physics, Superconductivity

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http://salesiana.dossiersoluciones.com/handle/123456789/98622

Consulte el texto completo en el siguiente enlace:

https://arxiv.org/abs/cond-mat/9901347
 http://arxiv.org/abs/cond-mat/9901347
 Phys. Rev. Lett. 82, 004938 (1999)
 doi:10.1103/PhysRevLett.82.4938

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arXiv