Reversible control of spin-polarized supercurrents in ferromagnetic Josephson junctions

N. Banerjee (), J.W.A. Robinson and M. G. Blamire
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N. Banerjee: University of Cambridge
J.W.A. Robinson: University of Cambridge
M. G. Blamire: University of Cambridge

Nature Communications, 2014, vol. 5, issue 1, 1-6

Abstract: Abstract 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-polarized triplet supercurrents in S–F–S Josephson junctions, reversible control of the supercurrent has been impossible because of the robust preconfigured 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.

Date: 2014
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DOI: 10.1038/ncomms5771

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