Suppression of giant magnetoresistance by a superconducting contact

Taddei, F. and Sanvito, S. and Jefferson, J. H. and Lambert, C. J. (1999) Suppression of giant magnetoresistance by a superconducting contact. Physical review letters, 82 (24). pp. 4938-4941. ISSN 0031-9007

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We predict that current perpendicular to the plane 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 magnetoresistive 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)(n)Cu and (Cu/Co)(n)Pb 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.

Item Type:
Journal Article
Journal or Publication Title:
Physical review letters
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?? physicsgeneral physics and astronomyphysics and astronomy(all)qc physics ??
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23 Oct 2012 09:08
Last Modified:
16 Jul 2024 09:10