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Observation of the dominant spin-triplet supercurrent in Josephson spin valves with strong Ni ferromagnets
Stockholm University, Faculty of Science, Department of Physics.
Stockholm University, Faculty of Science, Department of Physics.ORCID iD: 0000-0002-0367-687x
Stockholm University, Faculty of Science, Department of Physics.
Stockholm University, Faculty of Science, Department of Physics.ORCID iD: 0000-0002-3131-8658
2020 (English)In: Physical Review Research, E-ISSN 2643-1564, Vol. 2, no 1, article id 013167Article in journal (Refereed) Published
Abstract [en]

We study experimentally nanoscale Josephson junctions and Josephson spin valves containing strongly ferromagnetic Ni interlayers. We observe that in contrast to junctions, spin valves with the same geometry exhibit anomalous Ic(H) patterns with two peaks separated by a dip. We develop several techniques for in situ characterization of micromagnetic states in our nanodevices, including magnetoresistance, absolute Josephson fluxometry, and first-order-reversal-curves analysis. They reveal a clear correlation of the dip in supercurrent with the antiparallel state of a spin valve and the peaks with two noncollinear magnetic states, thus providing evidence for generation of spin-triplet superconductivity. A quantitative analysis, based on micromagnetic simulations, brings us to the conclusion that the triplet current in our Ni-based spin valves is approximately three times larger than the conventional spin-singlet supercurrent.

Place, publisher, year, edition, pages
2020. Vol. 2, no 1, article id 013167
Keywords [en]
Superconductivity, Ferromagnetism, spin-triplet state
National Category
Condensed Matter Physics
Identifiers
URN: urn:nbn:se:su:diva-203360DOI: 10.1103/physrevresearch.2.013167ISI: 000602492900006Scopus ID: 2-s2.0-85091855051OAI: oai:DiVA.org:su-203360DiVA, id: diva2:1648072
Funder
EU, Horizon 2020, 810144Available from: 2022-03-29 Created: 2022-03-29 Last updated: 2022-03-29Bibliographically approved

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Kapran, Olena M.Iovan, AdrianGolod, TarasKrasnov, Vladimir M.

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