Ferromagnetic proximity effect in a-Co_xSi_(1-x)/Nb bilayers: Role of magnetic disorder and interface transparency
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2010
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American Physical Society
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Abstract
The superconducting and magnetic properties of a-Co_(x)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-CoxSi1−x alloy decreases gradually, whereas their resistivity increases and enters in a weak localization regime. The superconducting transition temperatures of the a-Co_(x)Si_(1−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 scatterin.
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©2010 The American Physical Society.
Artículo firmado por mas de diez autores.
Work supported by Spanish MICINN Grants No. FIS2008-06249, No. HP2008-0032, and Consolider No. CSD2007-00010, CAM under Grant No. S2009/MAT-1726, UCM-Santander under Grant No. GR58-08, Asturias FICYT IB08-106 and BP06-109, and CRUP of Portugal Grant No. E41/09 in the framework of the Spanish-Portuguese Integrated Action. G.N.K. acknowledges support from FCT of Portugal through the “Ciencia 2007” program. We acknowledge L. Fernandez-Seivane for help with data acquisition software.