P. V. Leksin, A. A. Kamashev, N. N. Garif'yanov, A. A. Validov, Ya. V. Fominov, J. Schumann, V. E. Kataev, B. Büchner, I. A. Garifullin, “Experimental investigation of the role of the triplet pairing in the superconducting spin-valve effect”, Fizika Tverdogo Tela, 2016, Volume 58, Issue 11,Pages <nobr>2094

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XX International Symposium ''Nanophysics and Nanoelectronics'', Nizhny Novgorod, March 14-18, 2016
Superconductivity

Experimental investigation of the role of the triplet pairing in the superconducting spin-valve effect

P. V. Leksin^ab, A. A. Kamashev^a, N. N. Garif'yanov^a, A. A. Validov^a, Ya. V. Fominov^cd, J. Schumann^b, V. E. Kataev^b, B. Büchner^be, I. A. Garifullin^a

^a Zavoisky Physical Technical Institute, Kazan Scientific Center of the Russian Academy of Sciences
^b Leibniz Institute for Solid State and Material Research IFW, Dresden, Germany
^c Moscow Institute of Physics and Technology (State University), Dolgoprudny, Moscow region
^d L.D. Landau Institute for Theoretical Physics of Russian Academy of Sciences, Chernogolovka, Moscow region, Russia
^e Institut für Festkörperphysik, Technische Universität Dresden, Dresden, Germany

Abstract: An important role of the morphology of a superconducting layer in the superconducting spin-valve effect has been established. The triplet pairing induced by the superconductor/ferromagnet proximity effect has been experimentally investigated for samples CoO$_{x}$/Py1/Cu/Py2/Сu/Pb (where Py = Ni$_{0.81}$Fe$_{0.19}$) with a smooth superconducting layer. The optimization of the parameters of this structure has demonstrated a complete switching between the normal and superconducting states with a change in the relative orientation of magnetizations of the ferromagnetic layers from the antiparallel to orthogonal orientation. A pure triplet contribution has been observed for the sample with a permalloy layer thickness at which the superconducting spin-valve effect vanishes. A direct comparison of the experimental data with the theoretical calculation of the temperature of the transition to the superconducting state has been performed for the first time.