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

doi:10.1103/PhysRevB.82.184529

Ferromagnetic proximity effect in a -Co_x Si_1-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

Research output: Contribution to journal › Article › peer-review

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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 -Co_x Si_1-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 scattering term as magnetic disorder increases and the amorphous a -Co_x Si_1-x layers loose their magnetic character.

Original language	English
Article number	184529
Journal	Physical Review B - Condensed Matter and Materials Physics
Volume	82
Issue number	18
DOIs	https://doi.org/10.1103/PhysRevB.82.184529
State	Published - 19 Nov 2010
Externally published	Yes

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Alija, A., Pérez De Lara, D., Gonzalez, E. M., Kakazei, G. N., Sousa, J. B., Araujo, J. P., Hierro-Rodriguez, A., Martín, J. I., Alameda, J. M., Vélez, M., & Vicent, J. L. (2010). Ferromagnetic proximity effect in a -Co_x Si_1-x /Nb bilayers: Role of magnetic disorder and interface transparency. Physical Review B - Condensed Matter and Materials Physics, 82(18), [184529]. https://doi.org/10.1103/PhysRevB.82.184529

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

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.",

author = "A. Alija and {P{\'e}rez De Lara}, D. and Gonzalez, {E. M.} and Kakazei, {G. N.} and Sousa, {J. B.} and Araujo, {J. P.} and A. Hierro-Rodriguez and Mart{\'i}n, {J. I.} and Alameda, {J. M.} and M. V{\'e}lez and Vicent, {J. L.}",

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Alija, A, Pérez De Lara, D, Gonzalez, EM, Kakazei, GN, Sousa, JB, Araujo, JP, Hierro-Rodriguez, A, Martín, JI, Alameda, JM, Vélez, M & Vicent, JL 2010, 'Ferromagnetic proximity effect in a -Co_x Si_1-x /Nb bilayers: Role of magnetic disorder and interface transparency', Physical Review B - Condensed Matter and Materials Physics, vol. 82, no. 18, 184529. https://doi.org/10.1103/PhysRevB.82.184529

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T1 - Ferromagnetic proximity effect in a -Cox Si1-x /Nb bilayers

T2 - Role of magnetic disorder and interface transparency

AU - Alija, A.

AU - Pérez De Lara, D.

AU - Gonzalez, E. M.

AU - Kakazei, G. N.

AU - Sousa, J. B.

AU - Araujo, J. P.

AU - Hierro-Rodriguez, A.

AU - Martín, J. I.

AU - Alameda, J. M.

AU - Vélez, M.

AU - Vicent, J. L.

PY - 2010/11/19

Y1 - 2010/11/19

N2 - 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.

AB - 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.

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Ferromagnetic proximity effect in a -Co_x Si_1-x /Nb bilayers: Role of magnetic disorder and interface transparency

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