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- Title
Controlling spin pumping into superconducting Nb by proximity-induced spin-triplet Cooper pairs.
- Authors
Chan, A. K.; Cubukcu, M.; Montiel, X.; Komori, S.; Vanstone, A.; Thompson, J. E.; Perkins, G. K.; Kinane, C. J.; Caruana, A. J.; Boldrin, D.; Blamire, M.; Robinson, J.; Eschrig, M.; Kurebayashi, H.; Cohen, L. F.
- Abstract
Proximity-induced long-range spin-triplet supercurrents, important for the field of superconducting spintronics, are generated in superconducting/ferromagnetic heterostructures when interfacial magnetic inhomogeneities responsible for spin mixing and spin flip scattering are present. The multilayer stack Nb/Cr/Fe/Cr/Nb has been shown to support such currents when fabricated into Josephson junction devices. However, creating pure spin currents controllably in superconductors outside of the Josephson junction architecture is a bottleneck to progress. Recently, ferromagnetic resonance was proposed as a possible direction, the signature of pure supercurrent creation being an enhancement of the Gilbert damping below the superconducting critical temperature, but the necessary conditions are still poorly established. Here, we demonstrate that pumping pure spin currents into a superconductor in the presence of an external magnetic field is only possible when conditions supporting proximity-induced spin-triplet effects are satisfied. Our study is an important step forward for pure spin supercurrent creation, considerably advancing the field of superconducting spintronics. Superconducting spintronics has the potential to enhance device functionality by realising spin polarised supercurrents with greater coherence and reduced dissipation. Here, using ferromagnetic resonance, the authors investigate the temperature dependence of the Gilbert damping for the Fe layer of Nb/Fe/Nb and Nb/Cr/Fe/Cr/Nb stacks and the impact superconducting spin triplets have on the spin pumping behaviour.
- Subjects
COOPER pair; JOSEPHSON junctions; SUPERCONDUCTING transition temperature; FERROMAGNETIC resonance; SUPERCONDUCTORS; IRON-based superconductors; SPINTRONICS; MAGNETIC particles
- Publication
Communications Physics, 2023, Vol 6, Issue 1, p1
- ISSN
2399-3650
- Publication type
Article
- DOI
10.1038/s42005-023-01384-w