Expanding the operational temperature window of a superconducting spin valve

A. A. Kamashev; N. N. Garif'yanov; A. A. Validov; V. Kataev; A. S. Osin; Ya. V. Fominov; I. A. Garifullin

doi:10.1103/PhysRevB.109.144517

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Expanding the operational temperature window of a superconducting spin valve

A. A. Kamashev, N. N. Garif'yanov, A. A. Validov, V. Kataev, A. S. Osin, Ya. V. Fominov, I. A. Garifullin

DOI 10.1103/PhysRevB.109.144517 · Physical Review B

T1

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Abstract

To increase the efficiency of the superconducting spin valve (SSV), special attention should be paid to the choice of ferromagnetic materials for the F1/F2/S SSV multilayer. Here, we report the preparation and superconducting properties of the SSV heterostructures where Pb is used as the superconducting S layer. In the magnetic part of the structure, we use the same starting material, the Heusler alloy Co2Cr1−xFexAly, for both F1 and F2 layers. We utilize the tunability of the magnetic properties of this alloy, which, depending on the deposition conditions, forms either an almost fully spin-polarized half-metallic F1 layer or a weakly ferromagnetic F2 layer. We demonstrate that the combination of the distinct properties of these two layers boosts the generation of the long-range triplet component of the superconducting condensate in the fabricated SSV structures and yields superior values of the triplet spin-valve effect of more than 1 K and of the operational temperature window of the SSV up to 0.6 K.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
Pb Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	midpoint