Reduced decay in Josephson coupling across ferromagnetic junctions with spin–orbit coupling layers

Author:

Kindiak Ivan1ORCID,Mishra Swapna Sindhu1ORCID,Migliorini Andrea1ORCID,Pal Banabir1ORCID,Parkin Stuart S. P.1ORCID

Affiliation:

1. Max Planck Institute of Microstructure Physics , Weinberg 2, 06120 Halle, Germany

Abstract

The generation of Sz = 1 triplet Cooper pairs has been predicted theoretically in superconducting–ferromagnetic hybrid heterostructures in the presence of spin–orbit coupling [F. S. Bergeret and I. V. Tokatly, Phys. Rev. B 89, 134517 (2014) and Jacobsen et al., Sci. Rep. 6, 23926 (2016)]. In this study, we experimentally investigate vertical Josephson junctions where the weak link is formed from a ferromagnetic layer with perpendicular magnetic anisotropy sandwiched by two non-magnetic layers with weak or strong spin–orbit coupling. We find that the decay of the Josephson coupling is reduced in the latter case, possibly indicating the presence of Sz = 1 spin-triplet correlations. We speculate that the canted magnetization required for these correlations is provided by the interaction of magnetization with Meissner effect in the superconducting layers.

Funder

European Research Council

Publisher

AIP Publishing

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