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| VOLUME 91 | ISSUE 6 |
PAGE 329
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| Superconducting triplet spin valve |
Ya. V. Fominov+, A. A. Golubov *, T. Yu. Karminskaya , M. Yu. Kupriyanov , R. G. Deminov , L. R. Tagirov
+L.D. Landau Institute for Theoretical Physics RAS, 119334 Moscow, Russia *Faculty of Science and Technology and MESA+ Institute of Nanotechnology, University of Twente, 7500 AE Enschede, The Netherlands Nuclear Physics Institute, Moscow State University, 119992 Moscow, Russia Physics Faculty, Kazan State University, 420008 Kazan, Russia
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Abstract
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 but below and ,
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» ( ) and
«inverse» ( ) switching effects are
possible depending on parameters of the system.
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