Superconducting triplet spin valve

By Y. Fominov, A. Golubov, T. Karminskaya, M. Kupriyanov, R. Deminov, L. Tagirov. 2010

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We study the critical temperature Tc 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 Tc can be a nonmonotonic function of the angle α between the magnetizations of the two F layers. The minimum is achieved at an intermediate α, lying between the parallel (P, α = 0) and antiparallel (AP, α = π) cases. This implies a possibility of a “triplet” spin-valve effect: at temperatures above the minimum TcTr but below TcP and TcAP, the system is superconducting only in the vicinity of the collinear orientations. At certain parameters, we predict a reentrant Tc(α) behavior. At the same time, considering only the P and AP orientations, we find that both the “standard” (TcP < TcAP) and “inverse” (TcP > TcAP) switching effects are possible depending on parameters of the system.

Subfields: Condensed Matter Physics, Electronic, Optical and Magnetic Materials, Materials Chemistry

View Paper: https://www.semanticscholar.org/paper/e65a6fea244961c3096d551cc11be18d75564b1f