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.
@article{arxiv.2407.19799,
title = {Reduced decay in Josephson coupling across ferromagnetic junctions with spin-orbit coupling layers},
author = {Ivan Kindiak and Swapna Sindhu Mishra and Andrea Migliorini and Banabir Pal and Stuart S. P. Parkin},
journal= {arXiv preprint arXiv:2407.19799},
year = {2024}
}