Аннотация:We investigate critical temperature Tc of F2F1S trilayers (S is a singlet superconductor, Fi is a ferromagnetic metal), where the long-range triplet superconducting pairing component is generated at noncollinear magnetizations of the F layers [1]. Earlier we demonstrated that Tc in such structures can be non-monotonic function of the angle α between magnetizations of the two F layers [2,3]. It was shown recently [4] that anomalous dependence of the spin-triplet correlations on the angle α in FFS structures can be realized.
We demonstrate that it is possible to realize different spin-valve effect modes - the standard switching effect, the triplet spin-valve effect, reentrant Tc(α) dependence or reentrant Tc(α) dependence with the inverse switching effect - by variation of the F2/F1 interface transparency or the exchange splitting energy.
Moreover, we show that position of the Tc minimum can be changed by joint variation of the F2/F1 interface transparency and the layer thicknesses.
Thereby we demonstrate that the realization of one of the spin-valve effect modes can be done not only by variation of the F layers thicknesses, but also by varying the F2/F1 interface transparency or the exchange field energy. It is explained by changes in the interference conditions for the condensate functions. This interference depends on the F layers thicknesses, the F2/F1 interface transparency, and the exchange splitting energy.
The support by RFBR (grants No. 14-02-00348-a and No. 14-02-00793-a) is gratefully acknowledged.
[1] F.S. Bergeret, A.F. Volkov, and K.B. Efetov, Rev. Mod. Phys., 77 (2005) 1321-1373.
[2] Ya.V. Fominov, A.A. Golubov, T.Yu. Karminskaya, M.Yu. Kupriyanov, R.G. Deminov, and L.R. Tagirov, JETP Lett., 91 (2010) 308-313.
[3] R.G. Deminov, L.R. Tagirov, T.Yu. Karminskaya, M.Yu. Kupriyanov, Ya.V. Fominov, and A.A. Golubov, Phys. Rev. B (to be submitted).
[4] T.Yu. Karminskaya, A.A. Golubov, M.Yu. Kupriyanov, Phys. Rev. B, 84 (064531) (2011) 1-5.