Ferromagnetic proximity effect in a -Cox Si1-x /Nb bilayers: Role of magnetic disorder and interface transparency

A. Alija*, D. Pérez De Lara, E. M. Gonzalez, G. N. Kakazei, J. B. Sousa, J. P. Araujo, A. Hierro-Rodriguez, J. I. Martín, J. M. Alameda, M. Vélez, J. L. Vicent

*Corresponding author for this work

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Abstract

The superconducting and magnetic properties of a -Cox Si 1-x /Nb bilayers have been studied as a function of Co content in order to analyze the superconducting/ferromagnetic proximity effect in a system with strong disorder in the magnetic layers. As Co atoms become more diluted, the magnetization of the amorphous a -Cox Si1-x alloy decreases gradually, whereas their resistivity increases and enters in a weak localization regime. The superconducting transition temperatures of the a -Cox Si1-x /Nb bilayers follow a decreasing trend as Co content is reduced, reaching the lowest value at the boundary between the ferromagnetic-nonmagnetic amorphous phases. These results can be understood in terms of the increase in interface transparency together with the changes in the spin-flip scattering term as magnetic disorder increases and the amorphous a -Cox Si1-x layers loose their magnetic character.

Original languageEnglish
Article number184529
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume82
Issue number18
DOIs
StatePublished - 19 Nov 2010
Externally publishedYes

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