Reversible control of spin-polarised supercurrents in ferromagnetic Josephson junctions
MetadataShow full item record
Banerjee, N., Robinson, J., & Blamire, M. (2014). Reversible control of spin-polarised supercurrents in ferromagnetic Josephson junctions. Nature Communications, 5 4771. https://doi.org/10.1038/ncomms5771
Magnetic inhomogeneity at a superconductor (S) – ferromagnet (F) interface converts spin-singlet Cooper pairs into spin-one triplet pairs. These pairs are immune to the pair-breaking exchange field in F and support a long-range proximity effect. Although recent experiments have confirmed the existence of spin-polarised triplet supercurrents in S-F-S Josephson junctions, reversible control of the supercurrent has been impossible because of the robust pre-configured nature of the inhomogeneity. Here we use a barrier comprising three F layers whose relative magnetic orientation, and hence the interfacial inhomogeneity, can be controlled by small magnetic fields; we show that this enables full control of the triplet supercurrent and, by using finite element micromagnetic simulations, we can directly relate the experimental data to the theoretical models which provide a general framework to understand the role played by magnetic states in long-range supercurrent modulation.
External DOI: https://doi.org/10.1038/ncomms5771
This record's URL: https://www.repository.cam.ac.uk/handle/1810/245713