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Observation of the dominant spin-triplet supercurrent in Josephson spin valves with strong Ni ferromagnets
Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.ORCID-id: 0000-0002-0367-687x
Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.
Stockholms universitet, Naturvetenskapliga fakulteten, Fysikum.ORCID-id: 0000-0002-3131-8658
2020 (engelsk)Inngår i: Physical Review Research, E-ISSN 2643-1564, Vol. 2, nr 1, artikkel-id 013167Artikkel i tidsskrift (Fagfellevurdert) 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.

sted, utgiver, år, opplag, sider
2020. Vol. 2, nr 1, artikkel-id 013167
Emneord [en]
Superconductivity, Ferromagnetism, spin-triplet state
HSV kategori
Identifikatorer
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
Forskningsfinansiär
EU, Horizon 2020, 810144Tilgjengelig fra: 2022-03-29 Laget: 2022-03-29 Sist oppdatert: 2022-03-29bibliografisk kontrollert

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

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