Interfacial roughness and proximity effects in superconductor/ferromagnet CuNi/Nb heterostructures

Khaydukov Yu N.; Keller Thomas; Christiani Georg; Kupriyanov Mihail; Keimer Bernhard

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KHAYDUKOV, Yu N., , , , , KELLER, Thomas, CHRISTIANI, Georg, , , KUPRIYANOV, Mihail, , , KEIMER, Bernhard. Interfacial roughness and proximity effects in superconductor/ferromagnet CuNi/Nb heterostructures. In: Journal of Applied Physics, 2015, vol. 118, p. 0. ISSN 0021-8979. DOI: https://doi.org/10.1063/1.4936789

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Journal of Applied Physics

Volumul 118 / 2015 / ISSN 0021-8979 /ISSNe 1089-7550

Interfacial roughness and proximity effects in superconductor/ferromagnet CuNi/Nb heterostructures

DOI:https://doi.org/10.1063/1.4936789

Pag. 0-0

Khaydukov Yu N.¹²³, ⁴⁵, ¹⁶, Keller Thomas¹², Christiani Georg¹, ¹, Kupriyanov Mihail³⁵, ⁴, Keimer Bernhard¹

¹ Max Planck Institute for Solid State Research,
² Outstation at Heinz Maier-Leibnitz Zentrum (MLZ),
³ D.V. Skobeltsyn Institute of Nuclear Physics, M.V. Lomonosov Moscow State University,
⁴ Institute of the Electronic Engineering and Nanotechnologies "D. Ghitu" of the Academy of Sciences of Moldova,
⁵ Kazan Federal University,
⁶ Max Planck Society Outstation at MLZ

Disponibil în IBN: 23 mai 2023

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We report an investigation of the structural and electronic properties of hybrid superconductor/ferromagnet (S/F) bilayers of composition Nb/Cu₆₀Ni₄₀ prepared by magnetron sputtering. X-ray and neutron reflectometry show that both the overall interfacial roughness and vertical correlations of the roughness of different interfaces are lower for heterostructures deposited on Al₂O₃(1 1 ¯ 02) substrates than for those deposited on Si(111). Mutual inductance experiments were then used to study the influence of the interfacial roughness on the superconducting transition temperature, T_C. These measurements revealed a ∼4% higher T_C in heterostructures deposited on Al₂O₃, compared to those on Si. We attribute this effect to a higher mean-free path of electrons in the S layer, caused by a suppression of diffusive scattering at the interfaces. However, the dependence of the T_C on the thickness of the ferromagnetic layer is not significantly different in the two systems, indicating a weak influence of the interfacial roughness on the transparency for Cooper pairs.

Cuvinte-cheie
aluminum, Electronic properties, inductance, Interfaces (materials), Superconducting materials

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