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| Home > Publications database > Proximity effect in [Nb(1.5 nm)/Fe( x )]$_{10}$ /Nb(50 nm) superconductor/ferromagnet heterostructures |
| Journal Article | FZJ-2020-02997 |
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2020
Beilstein-Institut zur Förderung der Chemischen Wissenschaften
Frankfurt, M.
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Please use a persistent id in citations: http://hdl.handle.net/2128/25584 doi:10.3762/bjnano.11.109
Abstract: 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.
Keyword(s): Magnetic Materials (1st) ; Magnetism (2nd) ; Condensed Matter Physics (2nd)
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