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SM ISO690:2012 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 | |
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DOI:https://doi.org/10.3762/bjnano.11.109 | |
Pag. 1254-1263 | |
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Rezumat | |
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. |
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Cuvinte-cheie Ferromagnet, Iron (Fe), Mixed state, Neutron reflectometry, Niobium (Nb), Proximity effects, Superconductor |
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