Nanoscale Domain Wall Engineered Spin-Triplet Josephson Junctions and SQUID
| Autor: | Ekta Bhatia, N. A. Stelmashenko, Jason W. A. Robinson, Anand Srivastava, Kartik Senapati, James Devine-Stoneman, Zoe H. Barber |
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| Rok vydání: | 2021 |
| Předmět: |
Josephson effect
Physics Superconductivity Condensed matter physics Mechanical Engineering Bioengineering Context (language use) 02 engineering and technology General Chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics law.invention SQUID Condensed Matter::Materials Science Domain wall (magnetism) Ferromagnetism law Condensed Matter::Strongly Correlated Electrons General Materials Science Cooper pair 0210 nano-technology Spin (physics) |
| Zdroj: | Nano Letters. 21:3092-3097 |
| ISSN: | 1530-6992 1530-6984 |
| DOI: | 10.1021/acs.nanolett.1c00273 |
| Popis: | Spin-singlet Cooper pairs convert to spin-triplet Cooper pairs on passing through a magnetically noncollinear structure at a superconductor(S)/ferromagnet(F) interface. In this context, the generation of triplet supercurrents through intrinsic ferromagnetic domain walls, which are naturally occurring noncollinear magnetic features, was proposed theoretically in the past decade. However, an experimental demonstration has been lacking in the literature, particularly because of the difficulty in accessing a single domain wall, which is typically buried between two domains in a ferromagnetic material. By patterning a ferromagnetic nanoconstriction, we have been able to realize a nanoscale S/F/S planar junction, where a single domain wall (pinned at the nanoconstriction) acts as a Josephson barrier. In this geometry, we are able to show the predicted long-range triplet supercurrent across a ferromagnetic barrier exceeding 70 nm. Using this technique, we have demonstrated a ferromagnetic planar nano-SQUID device consisting of two Nb/Ni/Nb spin-triplet Josephson junctions. |
| Databáze: | OpenAIRE |
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