Superconducting triplet spin valve

Details Superconducting triplet spin valve Superconducting triplet spin valve

2010-02-10

arxiv.org/abs/1002.2113v2

JETP Letters 91, 308 (2010) [Pis'ma v ZhETF 91, 329 (2010)]

Physics

Condensed Matter

Superconductivity

5 pages (including 4 EPS figures)

Scientific paper

10.1134/S002136401006010X

We study the critical temperature T_c of SFF trilayers (S is a singlet superconductor, F is a ferromagnetic metal), where the long-range triplet superconducting component is generated at noncollinear magnetizations of the F layers. We demonstrate that T_c can be a nonmonotonic function of the angle \alpha between the magnetizations of the two F layers. The minimum is achieved at an intermediate \alpha, lying between the parallel (P, \alpha=0) and antiparallel (AP, \alpha=\pi) cases. This implies a possibility of a "triplet" spin-valve effect: at temperatures above the minimum T_c^{Tr} but below T_c^{P} and T_c^{AP}, the system is superconducting only in the vicinity of the collinear orientations. At certain parameters, we predict a reentrant T_c(\alpha) behavior. At the same time, considering only the P and AP orientations, we find that both the "standard" (T_c^{P} < T_c^{AP}) and "inverse" (T_c^{P} > T_c^{AP}) switching effects are possible depending on parameters of the system.

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