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This article is cited in 4 scientific papers (total in 4 papers)
CONDENSED MATTER
Giant spin-valve effect in heterostructures with a superconducting layer
A. A. Kamasheva, N. N. Garif'yanova, A. A. Validova, J. Schumannb, V. Kataevb, B. Büchnerbc, Ya. V. Fominovdef, I. A. Garifullina a Zavoisky Physical-Technical Institute, Kazan Scientific Center, Russian Academy of Sciences, Kazan, Russia
b Leibniz Institute for Solid State and Materials Research IFW Dresden, Dresden, Germany
c Institute for Solid State Physics, Technical University Dresden, Dresden, Germany
d Landau Institute of Theoretical Physics, Chernogolovka, Moscow region, Russia
e Moscow Institute of Physics and Technology (National Research University), Dolgoprudnyi, Moscow region, Russia
f National Research University Higher School of Economics, Moscow, Russia
Abstract:
The superconducting characteristics of the spin-valve Co$_2$Cr$_{1-x}$Fe$_x$Al$_y$/Cu/Ni/Cu/Pb heterostructures are studied. It is found that the difference in the plots characterizing superconducting transitions at the parallel and perpendicular orientations of magnetizations in the ferromagnetic Heusler alloy layer (HA = Co$_2$Cr$_{1-x}$Fe$_x$Al$_y$) with a high degree of spin polarization and in the nickel (Ni) layer can be as large as 0.5 K. For all samples, the dependence of $T_c$ on the angle between the magnetization directions of the ferromagnetic layers exhibits a deep minimum near the orthogonal orientation. This minimum results from the long-range triplet components of the superconducting condensate in a ferromagnetic material. At the perpendicular orientation of the magnetizations, the Heusler alloy layer with the high degree of spin polarization absorbs the spin-polarized Cooper pairs from the spacing between the Heusler alloy and Ni layers.
Received: 17.07.2019 Revised: 17.07.2019 Accepted: 17.07.2019
Citation:
A. A. Kamashev, N. N. Garif'yanov, A. A. Validov, J. Schumann, V. Kataev, B. Büchner, Ya. V. Fominov, I. A. Garifullin, “Giant spin-valve effect in heterostructures with a superconducting layer”, Pis'ma v Zh. Èksper. Teoret. Fiz., 110:5 (2019), 325–330; JETP Letters, 110:5 (2019), 342–347
Linking options:
https://www.mathnet.ru/eng/jetpl5991 https://www.mathnet.ru/eng/jetpl/v110/i5/p325
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