We report an unconventional and promising route to self-assemble distributed superconductor-ferromagnet-superconductor (S-F-S) Josephson Junctions on single crystal [100] MgO. These structures consist of [110] epitaxial nano-plaquettes of Fe covered with superconducting NbN films of varying thickness. The S-F-S structures are characterized by strong magnetoresistance (MR) anisotropy for the in-plane and out-of-plane magnetic fields. The stronger in-plane MR suggests decoherence of S-F-S junctions whose critical current follows a (1-T/Tc) and (1-T/Tc)1/2 dependence for T Tc and T<<Tc respectively, in accordance with the theory of supercurrent transport in such junctions.
@article{arxiv.0907.1490,
title = {Robust coupling of superconducting order parameter in a mesoscale NbN-Fe-NbN epitaxial structure},
author = {S. K. Bose and R. C. Budhani},
journal= {arXiv preprint arXiv:0907.1490},
year = {2009}
}