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Crossover between short- and long-range proximity effects in superconductor/ferromagnet/superconductor junctions with Ni-based ferromagnets
Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum. Royal Institute of Technology, Sweden.ORCID-id: 0000-0002-0367-687x
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Rekke forfattare: 62021 (engelsk)Inngår i: Physical Review B, ISSN 2469-9950, E-ISSN 2469-9969, Vol. 103, nr 9, artikkel-id 094509Artikkel i tidsskrift (Fagfellevurdert) 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.

sted, utgiver, år, opplag, sider
2021. Vol. 103, nr 9, artikkel-id 094509
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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
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EU, Horizon 2020Tilgjengelig fra: 2021-08-03 Laget: 2021-08-03 Sist oppdatert: 2022-03-29bibliografisk kontrollert

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

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