Josephson junctions containing ferromagnetic materials are generating interest for use in superconducting electronics and cryogenic memory. Optimizing the performance of such junctions is an ongoing effort, requiring exploration of a broad range of magnetic systems. Here we study supercurrent transmission through Ni/Ru/Ni synthetic antiferromagnets, with the idea that their magnetic properties may be superior to those of isolated Ni layers. We find that the decay of the supercurrent as a function of Ni thickness is very slow, with a decay length of 7.5 ± 0.8 nm. We also characterize the magnetic properties of the synthetic antiferromagnets as a function of Ni and Ru thicknesses.
@article{arxiv.2108.10376,
title = {Supercurrent transmission through Ni/Ru/Ni synthetic antiferromagnets},
author = {Swapna Sindhu Mishra and Reza Loloee and Norman O. Birge},
journal= {arXiv preprint arXiv:2108.10376},
year = {2021}
}