<p> MIPT Conference 2016 “ Superconducting hybrid nanostructures: physics and application”</p><p>Controllable tuning of spin-singlet and spin-triplet currents in a Josephson spin-valve</p><p>V. M. Krasnov, A. Iovan, and T. Golod</p><p>Department of Physics, Stockholm University, AlbaNova University Center, SE-10691 Stockholm, Sweden </p><p>Josephson spin valve is a device in which a spin valve structure is implemented as a barrier in a Josephson junction. It has been predicted theoretically that the proximity effect in a superconducting spin-valve should strongly depend on a relative orientation of magnetization in ferromagnetic layers of the spin valve [1,2]. An odd-spin-triplet component of the superconducting order parameter can be generated in the non-collinear state of the spin-valve. Several experimental reports were confirming such a behavior [3-5]. However, unambiguous interpretation of the data requires accurate control of the spin-valve state. This also presumes a mono-domain state of the spin-valve. In this talk we present our recent results on experimental analysis of nano-scale Josephson spin-valves with sizes down to 150 nm made by 3D nano-sculpturing [6]. Small dimensions were necessary both for mono-domain switching of spin valves and for enhancement of junction resistances to comfortably measurable values. Ferromagnetic layers in the spin-valve are made dissimilar using a combination of diluted (CuNi) ferromagnets with different Ni concentration of with combination of different strong (Ni, Co, Py) ferromagnets. Our Josephson spin- valves exhibit clear Fraunhofer-type modulation of the Josephson critical current Ic(H) and a regular spin-valve magnetoresistance with minima/maxima at parallel/ anti-parallel orientations of the spin valve [7]. We put special efforts to development of accurate ways for in-situ analysis of the spin-valve state. We demonstrate how two-dimensional angular orientation of magnetic moments of ferromagnetic layers in the spin-valve can be accurately measured in-situ. This allows us to make an unambiguous connection between the relative orientation of magnetizations and the amplitude of the Josephson current, which indicate that both the spin-singlet and the spin-triplet components of the supercurrent are tuned with changing the orientation of the spin-valve. Finally, we discuss possible application of Josephson spin-valves as memory cells [8]. </p><p>[1] A. I. Buzdin, Rev. Mod. Phys. 77, 935 (2005). [2] F. S. Bergeret, A. F. Volkov, and K. B. Efetov, Rev. Mod. Phys. 77, 1321 (2005). [3] C. Bell, G. Burnell, C. W. Leung, E. J. Tarte, D.-J. Kang, and M. G. Blamire, Appl. Phys. Lett. 84, 1153 (2004). [4] T. S.Khaire, M. A. Khasawneh, W. P. Pratt, Jr., and N. O. Birge, Phys. Rev. Lett. 104, 137002 (2010). [5] P. V. Leksin, N. N. Garif’yanov, I. A. Garifullin, J. Schumann, V. Kataev, O. G. Schmidt, and B. Buchner, Phys. Rev. Lett. 106, 067005 (2011). [6] T. Golod, A. Rydh, and V.M. Krasnov, Phys. Rev. Lett., 104, 227003 (2010). [7] A. Iovan, T. Golod, and V.M. Krasnov, Phys. Rev. B, 90, 134514 (2014). [8] T. Golod, A. Iovan and V.M. Krasnov, Nat. Commun. 6, 8628 (2015)</p><p>1</p>