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JOURNALS // Pis'ma v Zhurnal Èksperimental'noi i Teoreticheskoi Fiziki // Archive

Pis'ma v Zh. Èksper. Teoret. Fiz., 2017 Volume 106, Issue 12, Pages 769–774 (Mi jetpl5452)

This article is cited in 1 paper

CONDENSED MATTER

Estimate of the degree of the spin polarization of a ferromagnet from data on the superconductor/ferromagnet proximity effect

A. A. Kamasheva, P. V. Leksina, J. Schumannb, J. Thomasb, T. Gemmingb, V. Kataevb, B. Büchnerb, I. A. Garifullina

a Zavoisky Physical–Technical Institute, Russian Academy of Sciences, Kazan, Russia
b Leibniz Institute for Solid State and Materials Research IFW Dresden, Dresden, Germany

Abstract: The superconductor/ferromagnet proximity effect in the Pb/Co$_2$Cr$_{1-x}$Fe$_x$Al bilayer systems has been studied. Thin films of the Heusler alloy Co$_2$Cr$_{1-x}$Fe$_x$Al have been prepared at different substrate temperatures. It has been established using Andreev spectroscopy of point contacts that the degree of spin polarization of conduction electrons in the Heusler alloy is on the order of 30 and 70% for the films prepared at a substrate temperature of 300 and 600 K, respectively. It has been found that the dependence of the superconducting transition temperature on the thickness of the Pb layer at a fixed thickness of the Heusler layer is determined by the degree of spin polarization of the conduction band in the ferromagnetic layer.

Received: 31.10.2017
Revised: 09.11.2017

DOI: 10.7868/S0370274X17240092


 English version:
Journal of Experimental and Theoretical Physics Letters, 2017, 106:12, 805–809

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