Proximity effect between a superconductor and a partially spin-polarized ferromagnet: Case study of the Pb/Cu/Co2Cr1−xFexAl trilayer

Proximity effect between a superconductor and a partially spin-polarized ferromagnet: Case study... We have studied the proximity effect in thin-film heterostructures composed of the superconducting Pb (S) and of the ferromagnetic Heusler alloy Co2Cr1−xFexAl (F) with different degrees of the spin polarization of the conduction band. A thin Cu interlayer is inserted in between the S and F layers to ensure the stability of the S/F interface. The analysis of the dependences of the superconducting transition temperatures in such heterostructures on the thickness of the Pb or of the Heusler alloy using the theory by Fominov et al. [Ya. V. Fominov, N. M. Chtchelkatchev, and A. A. Golubov, Phys. Rev. B 66, 014507 (2002)PRBMDO0163-182910.1103/PhysRevB.66.014507] shows that, with increasing the exchange splitting of the conduction band of a ferromagnet and, respectively, of the degree of the spin polarization, the probability of transmission of the superconducting Cooper pairs through the S/F interface decreases. We conclude that the spin imbalance plays a key role in the processes taking place at the interface between a superconductor and a ferromagnet with spin-polarized conduction electrons. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Physical Review B American Physical Society (APS)

Proximity effect between a superconductor and a partially spin-polarized ferromagnet: Case study of the Pb/Cu/Co2Cr1−xFexAl trilayer

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Proximity effect between a superconductor and a partially spin-polarized ferromagnet: Case study of the Pb/Cu/Co2Cr1−xFexAl trilayer

Abstract

We have studied the proximity effect in thin-film heterostructures composed of the superconducting Pb (S) and of the ferromagnetic Heusler alloy Co2Cr1−xFexAl (F) with different degrees of the spin polarization of the conduction band. A thin Cu interlayer is inserted in between the S and F layers to ensure the stability of the S/F interface. The analysis of the dependences of the superconducting transition temperatures in such heterostructures on the thickness of the Pb or of the Heusler alloy using the theory by Fominov et al. [Ya. V. Fominov, N. M. Chtchelkatchev, and A. A. Golubov, Phys. Rev. B 66, 014507 (2002)PRBMDO0163-182910.1103/PhysRevB.66.014507] shows that, with increasing the exchange splitting of the conduction band of a ferromagnet and, respectively, of the degree of the spin polarization, the probability of transmission of the superconducting Cooper pairs through the S/F interface decreases. We conclude that the spin imbalance plays a key role in the processes taking place at the interface between a superconductor and a ferromagnet with spin-polarized conduction electrons.
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Publisher
The American Physical Society
Copyright
Copyright © ©2017 American Physical Society
ISSN
1098-0121
eISSN
1550-235X
D.O.I.
10.1103/PhysRevB.96.024512
Publisher site
See Article on Publisher Site

Abstract

We have studied the proximity effect in thin-film heterostructures composed of the superconducting Pb (S) and of the ferromagnetic Heusler alloy Co2Cr1−xFexAl (F) with different degrees of the spin polarization of the conduction band. A thin Cu interlayer is inserted in between the S and F layers to ensure the stability of the S/F interface. The analysis of the dependences of the superconducting transition temperatures in such heterostructures on the thickness of the Pb or of the Heusler alloy using the theory by Fominov et al. [Ya. V. Fominov, N. M. Chtchelkatchev, and A. A. Golubov, Phys. Rev. B 66, 014507 (2002)PRBMDO0163-182910.1103/PhysRevB.66.014507] shows that, with increasing the exchange splitting of the conduction band of a ferromagnet and, respectively, of the degree of the spin polarization, the probability of transmission of the superconducting Cooper pairs through the S/F interface decreases. We conclude that the spin imbalance plays a key role in the processes taking place at the interface between a superconductor and a ferromagnet with spin-polarized conduction electrons.

Journal

Physical Review BAmerican Physical Society (APS)

Published: Jul 20, 2017

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