Abstract
Structural, magnetic, and superconducting properties of S/F bilayers Nb/Cu 40Ni 60 deposited on silicon substrate have been characterized using polarized neutron reflectometry and complementary techniques. The study allowed to determine real thicknesses of the S and F layers as well as the r.m.s. roughness of the S/F interfaces. The latter does not exceed 1 nm, showing the high quality of the S/F interface. Using SQUID and a mutual inductance setup, we determined the superconducting transition temperatures of the samples, which are in agreement with the literature data. Using of polarized neutron reflectometry (PNR) for the single S layer allowed to determine the screening length λ of the superconducting layer, λ = 120 nm. This value is higher than the London penetration depth for pure niobium which may indicate that the superconductor is in the dirty limit. PNR and SQUID studies of magnetic properties of the CuNi layer have shown the presence of ferromagnetism in all investigated samples.
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Acknowledgments
This work was carried out in the framework of the collaboration agreement between Max-Planck-Institut für Festkörperforschung and Institute of Electronic Engineering and Nanotechnologies ASM, and based upon experiments performed at the NREX instrument operated by Max-Planck Society at the Heinz Maier-Leibnitz Zentrum (MLZ), Garching, Germany. The neutron part of the project has been supported by the European Commission under the 7th Framework Programme through the “Research Infrastructures” action of the Capacities Programme, NMI3-II, Grant Agreement Number 283883. R.M. and L.T. would like to thank the Program of Competitive Growth of Kazan Federal University among World’s Leading Academic Centers. The SNMS depth profile measurements were supported by the Hungarian–Chinese bilateral project, TE’T_12_CN-1-2012-0036.
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Khaydukov, Y., Morari, R., Mustafa, L. et al. Structural, Magnetic, and Superconducting Characterization of the CuNi/Nb Bilayers of the S/F Type Using Polarized Neutron Reflectometry and Complementary Techniques. J Supercond Nov Magn 28, 1143–1147 (2015). https://doi.org/10.1007/s10948-014-2850-3
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DOI: https://doi.org/10.1007/s10948-014-2850-3