Home > Publications database > Proximity effect in [Nb(1.5 nm)/Fe( x )]$_{10}$ /Nb(50 nm) superconductor/ferromagnet heterostructures > print

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100 1 _ |a Khaydukov, Yury
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245 _ _ |a Proximity effect in [Nb(1.5 nm)/Fe( x )]$_{10}$ /Nb(50 nm) superconductor/ferromagnet heterostructures
260 _ _ |a Frankfurt, M.
|c 2020
|b Beilstein-Institut zur Förderung der Chemischen Wissenschaften
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520 _ _ |a 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$\bar{1}$02) 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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770 _ _ |a Functional nanostructures for electronics, spintronics and sensors
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