Triplet supercurrent in ferromagnetic Josephson junctions by spin injection
Superconductivity
2015-06-11 v1 Mesoscale and Nanoscale Physics
Quantum Physics
Abstract
We show that injecting nonequilibrium spins into the superconducting leads strongly enhances the stationary Josephson current through a superconductor-ferromagnet-superconductor junction. The resulting long-range super-current through a ferromagnet is carried by triplet Cooper pairs that are formed in s-wave superconductors by the combined effects of spin injection and exchange interaction. We quantify the exchange interaction in terms of Landau Fermi-liquid factors. The magnitude and direction of the long-range Josephson current can be manipulated by varying the angles of the injected polarizations with respect to the magnetization in the ferromagnet.
Cite
@article{arxiv.1208.5629,
title = {Triplet supercurrent in ferromagnetic Josephson junctions by spin injection},
author = {A. G. Mal'shukov and Arne Brataas},
journal= {arXiv preprint arXiv:1208.5629},
year = {2015}
}