Proximity effect in [Nb(1.5 nm)/Fe(x)]10/Nb(50 nm) superconductor/ferromagnet heterostructures
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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, nr. 11, pp. 1254-1263. ISSN 2190-4286.
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Beilstein Journal of Nanotechnology
Numărul 11 / 2020 / ISSN 2190-4286

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


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


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.

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