Structural, Magnetic, and Superconducting Characterization of the CuNi/Nb Bilayers of the S/F Type Using Polarized Neutron Reflectometry and Complementary Techniques

Y. Khaydukov, R. Morari, L. Mustafa, J. H. Kim, T. Keller, S. Belevski, A. Csík, L. Tagirov, G. Logvenov, A. Sidorenko, B. Keimer

Research output: Contribution to journalArticle

4 Citations (Scopus)

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.

Original languageEnglish
Pages (from-to)1143-1147
Number of pages5
JournalJournal of Superconductivity and Novel Magnetism
Volume28
Issue number3
DOIs
Publication statusPublished - Feb 25 2015

Fingerprint

Neutrons
SQUIDs
neutrons
Niobium
F region
Ferromagnetism
Silicon
magnetic properties
Inductance
Superconducting materials
Superconducting transition temperature
Magnetic properties
Screening
Surface roughness
inductance
niobium
ferromagnetism
roughness
screening
penetration

Keywords

  • Ferromagnets
  • Polarized neutron reflectometry
  • Proximity effects
  • Superconductors

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

Structural, Magnetic, and Superconducting Characterization of the CuNi/Nb Bilayers of the S/F Type Using Polarized Neutron Reflectometry and Complementary Techniques. / Khaydukov, Y.; Morari, R.; Mustafa, L.; Kim, J. H.; Keller, T.; Belevski, S.; Csík, A.; Tagirov, L.; Logvenov, G.; Sidorenko, A.; Keimer, B.

In: Journal of Superconductivity and Novel Magnetism, Vol. 28, No. 3, 25.02.2015, p. 1143-1147.

Research output: Contribution to journalArticle

Khaydukov, Y. ; Morari, R. ; Mustafa, L. ; Kim, J. H. ; Keller, T. ; Belevski, S. ; Csík, A. ; Tagirov, L. ; Logvenov, G. ; Sidorenko, A. ; Keimer, B. / Structural, Magnetic, and Superconducting Characterization of the CuNi/Nb Bilayers of the S/F Type Using Polarized Neutron Reflectometry and Complementary Techniques. In: Journal of Superconductivity and Novel Magnetism. 2015 ; Vol. 28, No. 3. pp. 1143-1147.
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