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Open Access item Ferromagnetic proximity effect in a-CoxSi1−x/Nb bilayers: Role of magnetic disorder and interface transparency

Authors:Alija, Alfonso R.
Hierro-Rodríguez, A.
Martín, J. I.
Alameda, J. M.
Vélez, M.
Issue Date:2010
Publisher:American Physical Society
Citation:Physical Review B 82(18): 184529 (2010)
Abstract:The superconducting and magnetic properties of a-CoxSi1−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-CoxSi1−x alloy decreases gradually, whereas their resistivity increases and enters in a weak localization regime. The superconducting transition temperatures of the a-CoxSi1−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-CoxSi1−x layers loose their magnetic character.
Description:7 páginas. 4 figuras.-- PACS number(s): 74.45.+c.-- et al.
Publisher version (URL):http://dx.doi.org/10.1103/PhysRevB.59.14659
URI:http://hdl.handle.net/10261/43859
ISSN:0163-1829
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