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Crossover between short- and long-range proximity effects in superconductor/ferromagnet/superconductor junctions with Ni-based ferromagnets
Stockholm University, Faculty of Science, Department of Physics.
Stockholm University, Faculty of Science, Department of Physics.
Stockholm University, Faculty of Science, Department of Physics. Royal Institute of Technology, Sweden.ORCID iD: 0000-0002-0367-687x
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Number of Authors: 62021 (English)In: Physical Review B, ISSN 2469-9950, E-ISSN 2469-9969, Vol. 103, no 9, article id 094509Article in journal (Refereed) Published
Abstract [en]

We study superconductor/ferromagnet/superconductor junctions with CuNi, PtNi, or Ni interlayers. Remarkably, we observe that supercurrents through Ni can be significantly larger than through diluted alloys. The phenomenon is attributed to the dirtiness of disordered alloys leading to a short coherence length despite a small exchange energy. To the contrary, pure Ni is clean resulting in a coherence length as long as in a normal metal. Analysis of temperature dependencies of critical currents reveals a crossover from short (dirty) to long (clean) range proximity effects in Pt1−xNix with increasing Ni concentration. Our results point out that structural properties of a ferromagnet play a crucial role for the proximity effect and indicate that conventional strong-but-clean ferromagnets can be advantageously used in superconducting spintronic devices.

Place, publisher, year, edition, pages
2021. Vol. 103, no 9, article id 094509
National Category
Condensed Matter Physics
Identifiers
URN: urn:nbn:se:su:diva-194535DOI: 10.1103/PhysRevB.103.094509ISI: 000646411000004Scopus ID: 2-s2.0-85102849716OAI: oai:DiVA.org:su-194535DiVA, id: diva2:1582721
Funder
EU, Horizon 2020Available from: 2021-08-03 Created: 2021-08-03 Last updated: 2022-03-29Bibliographically approved

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Kapran, Olena M.Golod, TarasIovan, AdrianSidorenko, A. S.Krasnov, Vladimir M.

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