Interfacial roughness and proximity effects in superconductor/ferromagnet CuNi/Nb heterostructures

Khaydukov Yu N.; Morari Roman; Soltwedel Olaf; Keller Thomas; Christiani Georg; Logvenov Gennadii Yu.; Kupriyanov Mihail; Sidorenko Anatolie; Keimer Bernhard

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KHAYDUKOV, Yu N., MORARI, Roman, SOLTWEDEL, Olaf, KELLER, Thomas, CHRISTIANI, Georg, LOGVENOV, Gennadii Yu., KUPRIYANOV, Mihail, SIDORENKO, Anatolie, KEIMER, Bernhard. Interfacial roughness and proximity effects in superconductor/ferromagnet CuNi/Nb heterostructures. In: Journal of Applied Physics, 2015, vol. 118, p. 0. ISSN 0021-8979. DOI: https://doi.org/10.1063/1.4936789

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Journal of Applied Physics

Volumul 118 / 2015 / ISSN 0021-8979 /ISSNe 1089-7550

Interfacial roughness and proximity effects in superconductor/ferromagnet CuNi/Nb heterostructures

DOI:https://doi.org/10.1063/1.4936789

Pag. 0-0

Khaydukov Yu N.¹²³, Morari Roman⁴⁵, Soltwedel Olaf¹⁶, Keller Thomas¹², Christiani Georg¹, Logvenov Gennadii Yu.¹, Kupriyanov Mihail³⁵, 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" of the Academy of Sciences of Moldova,
⁵ Kazan Federal University,
⁶ Max Planck Society Outstation at MLZ

Disponibil în IBN: 23 mai 2023

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We report an investigation of the structural and electronic properties of hybrid superconductor/ferromagnet (S/F) bilayers of composition Nb/Cu₆₀Ni₄₀ prepared by magnetron sputtering. X-ray and neutron reflectometry show that both the overall interfacial roughness and vertical correlations of the roughness of different interfaces are lower for heterostructures deposited on Al₂O₃(1 1 ¯ 02) substrates than for those deposited on Si(111). Mutual inductance experiments were then used to study the influence of the interfacial roughness on the superconducting transition temperature, T_C. These measurements revealed a ∼4% higher T_C in heterostructures deposited on Al₂O₃, compared to those on Si. We attribute this effect to a higher mean-free path of electrons in the S layer, caused by a suppression of diffusive scattering at the interfaces. However, the dependence of the T_C on the thickness of the ferromagnetic layer is not significantly different in the two systems, indicating a weak influence of the interfacial roughness on the transparency for Cooper pairs.

Cuvinte-cheie
aluminum, Electronic properties, inductance, Interfaces (materials), Superconducting materials

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<dc:creator>Khaydukov, Y.</dc:creator>
<dc:creator>Morari, R.A.</dc:creator>
<dc:creator>Soltwedel, O.</dc:creator>
<dc:creator>Keller, T.</dc:creator>
<dc:creator>Christiani, G.</dc:creator>
<dc:creator>Logvenov, G.</dc:creator>
<dc:creator>Kupriyanov, M.I.</dc:creator>
<dc:creator>Sidorenko, A.S.</dc:creator>
<dc:creator>Keimer, B.</dc:creator>
<dc:date>2015-12-07</dc:date>
<dc:description xml:lang='en'><p>We report an investigation of the structural and electronic properties of hybrid superconductor/ferromagnet (S/F) bilayers of composition Nb/Cu<sub>60</sub>Ni<sub>40</sub>&nbsp;prepared by magnetron sputtering. X-ray and neutron reflectometry show that both the overall interfacial roughness and vertical correlations of the roughness of different interfaces are lower for heterostructures deposited on Al<sub>2</sub>O<sub>3</sub>(1 1 &macr; 02) substrates than for those deposited on Si(111). Mutual inductance experiments were then used to study the influence of the interfacial roughness on the superconducting transition temperature, T<sub>C</sub>. These measurements revealed a &sim;4% higher T<sub>C</sub>&nbsp;in heterostructures deposited on Al<sub>2</sub>O<sub>3</sub>, compared to those on Si. We attribute this effect to a higher mean-free path of electrons in the S layer, caused by a suppression of diffusive scattering at the interfaces. However, the dependence of the T<sub>C</sub>&nbsp;on the thickness of the ferromagnetic layer is not significantly different in the two systems, indicating a weak influence of the interfacial roughness on the transparency for Cooper pairs.&nbsp;</p></dc:description>
<dc:identifier>10.1063/1.4936789</dc:identifier>
<dc:source>Journal of Applied Physics  () 0-0</dc:source>
<dc:subject>aluminum</dc:subject>
<dc:subject>Electronic properties</dc:subject>
<dc:subject>inductance</dc:subject>
<dc:subject>Interfaces (materials)</dc:subject>
<dc:subject>Superconducting materials</dc:subject>
<dc:title>Interfacial roughness and proximity effects in superconductor/ferromagnet CuNi/Nb heterostructures</dc:title>
<dc:type>info:eu-repo/semantics/article</dc:type>
</oai_dc:dc>