Proximity effect in [Nb(1.5 nm)/Fe(x)]10/Nb(50 nm) superconductor/ferromagnet heterostructures

Khaydukov Yu N.; Putter Sabine; Guasco Laura; Morari Roman; Kim Gideok; Keller Thomas; Sidorenko Anatolie; Keimer Bernhard

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KHAYDUKOV, Yu N., PUTTER, Sabine, GUASCO, Laura, MORARI, Roman, KIM, Gideok, KELLER, Thomas, SIDORENKO, Anatolie, KEIMER, Bernhard. Proximity effect in [Nb(1.5 nm)/Fe(x)]10/Nb(50 nm) superconductor/ferromagnet heterostructures. In: Beilstein Journal of Nanotechnology, 2020, vol. 11, pp. 1254-1263. ISSN 2190-4286. DOI: https://doi.org/10.3762/bjnano.11.109

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Beilstein Journal of Nanotechnology

Volumul 11 / 2020 / ISSN 2190-4286

Proximity effect in [Nb(1.5 nm)/Fe(x)]₁₀/Nb(50 nm) superconductor/ferromagnet heterostructures

DOI:https://doi.org/10.3762/bjnano.11.109

Pag. 1254-1263

Khaydukov Yu N.¹²³, Putter Sabine², Guasco Laura¹, Morari Roman⁴, Kim Gideok¹, Keller Thomas¹², Sidorenko Anatolie⁴, 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"

Disponibil în IBN: 14 septembrie 2020

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We have investigated the structural, magnetic and superconduction properties of [Nb(1.5 nm)/Fe(x)]₁₀ superlattices deposited on a thick Nb(50 nm) layer. Our investigation showed that the Nb(50 nm) layer grows epitaxially at 800 °C on the Al₂O₃(1-102) substrate. Samples grown at this condition possess a high residual resistivity ratio of 15-20. By using neutron reflectometry we show that Fe/Nb superlattices with x < 4 nm form a depth-modulated FeNb alloy with concentration of iron varying between 60% and 90%. This alloy has weak ferromagnetic properties. The proximity of this weak ferromagnetic layer to a thick superconductor leads to an intermediate phase that is characterized by a suppressed but still finite resistance of structure in a temperature interval of about 1 K below the superconducting transition of thick Nb. By increasing the thickness of the Fe layer to x = 4 nm the intermediate phase disappears. We attribute the intermediate state to proximity induced non-homogeneous superconductivity in the structure.

Cuvinte-cheie
Ferromagnet, Iron (Fe), Mixed state, Neutron reflectometry, Niobium (Nb), Proximity effects, Superconductor

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