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, 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


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.

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

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<dc:creator>Khaydukov, Y.</dc:creator>
<dc:creator>Putter, S.</dc:creator>
<dc:creator>Guasco, L.</dc:creator>
<dc:creator>Morari, R.A.</dc:creator>
<dc:creator>Kim, G.</dc:creator>
<dc:creator>Keller, T.</dc:creator>
<dc:creator>Sidorenko, A.S.</dc:creator>
<dc:creator>Keimer, B.</dc:creator>
<dc:date>2020-04-01</dc:date>
<dc:description xml:lang='en'><p>We have investigated the structural, magnetic and superconduction properties of [Nb(1.5 nm)/Fe(x)]<sub>10</sub>&nbsp;superlattices deposited on a thick Nb(50 nm) layer. Our investigation showed that the Nb(50 nm) layer grows epitaxially at 800 &deg;C on the Al<sub>2</sub>O<sub>3</sub>(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 &lt; 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.</p></dc:description>
<dc:identifier>10.3762/bjnano.11.109</dc:identifier>
<dc:source>Beilstein Journal of Nanotechnology  () 1254-1263</dc:source>
<dc:subject>Ferromagnet</dc:subject>
<dc:subject>Iron (Fe)</dc:subject>
<dc:subject>Mixed state</dc:subject>
<dc:subject>Neutron reflectometry</dc:subject>
<dc:subject>Niobium (Nb)</dc:subject>
<dc:subject>Proximity effects</dc:subject>
<dc:subject>Superconductor</dc:subject>
<dc:title>Proximity effect in [Nb(1.5 nm)/Fe(x)]10/Nb(50 nm) superconductor/ferromagnet heterostructures</dc:title>
<dc:type>info:eu-repo/semantics/article</dc:type>
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