Superconducting switching due to a triplet component in the Pb/Cu/Ni/Cu/Co2Cr1-xFexAly spin-valve structure

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Date
2019
Authors
Kamashev, A.A.
Garif'yanov, N.N.
Validov, A.A.
Schumann, J.
Kataev, V.
Büchner, B.
Fominov, Y.V.
Garifullin, I.A.
Volume
10
Issue
Journal
Series Titel
Book Title
Publisher
Frankfurt am Main : Beilstein-Institut zur Förderung der Chemischen Wissenschaften
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Abstract

We report the superconducting properties of the Co2Cr1-xFexAly/Cu/Ni/Cu/Pb spin-valve structure the magnetic part of which comprises the Heusler alloy layer HA = Co2Cr1-xFexAly with a high degree of spin polarization (DSP) of the conduction band and a Ni layer of variable thickness. The separation between the superconducting transition curves measured for the parallel (α = 0°) and perpendicular (α = 90°) orientation of the magnetization of the HA and the Ni layers reaches up to 0.5 K (α is the angle between the magnetization of two ferromagnetic layers). For all studied samples the dependence of the superconducting transition temperature Tc on α demonstrates a deep minimum in the vicinity of the perpendicular configuration of the magnetizations. This suggests that the observed minimum and the corresponding full switching effect of the spin valve is caused by the long-range triplet component of the superconducting condensate in the multilayer. Such a large effect can be attributed to a half-metallic nature of the HA layer, which in the orthogonal configuration efficiently draws off the spin-polarized Cooper pairs from the space between the HA and Ni layers. Our results indicate a significant potential of the concept of a superconducting spin-valve multilayer comprising a half-metallic ferromagnet, recently proposed by A. Singh et al., Phys. Rev. X 2015, 5, 021019, in achieving large values of the switching effect.

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Keywords
Ferromagnet, Proximity effect, Superconductor, Aluminum alloys, Chromium alloys, Cobalt alloys, Copper, Ferromagnetic materials, Ferromagnetism, Iron alloys, Magnetization, Magnetoresistance, Magnets, Multilayers, Nickel, Spin polarization, Superconducting materials, Ferromagnets, Half-metallic ferromagnets, Orthogonal configurations, Proximity effects, Spin-valve multilayers, Superconducting condensates, Superconducting properties, Superconducting transitions, Superconducting transition temperature
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License
CC BY 4.0 Unported