Supercurrent in Long SFFS Junctions with Antiparallel Domain Configuration
Abstract
We calculate the current-phase relation of a long Josephson junction consisting of two ferromagnetic domains with equal, but opposite magnetization , sandwiched between two superconductors. In the clean limit, the current-phase relation is obtained with the help of Eilenberger equation. In general, the supercurrent oscillations are non-sinusoidal and their amplitude decays algebraically when the exchange field is increased. If the two domains have the same size, the amplitude is independent of , due to an exact cancellation of the phases acquired in each ferromagnetic domain. These results change drastically in the presence of disorder. We explicitly study two cases: Fluctuations of the domain size (in the framework of the Eilenberger equation) and impurity scattering (using the Usadel equation). In both cases, the current-phase relation becomes sinusoidal and the amplitude of the supercurrent oscillations is exponentially suppressed with , even if the domains are identical on average.
Cite
@article{arxiv.cond-mat/0306706,
title = {Supercurrent in Long SFFS Junctions with Antiparallel Domain Configuration},
author = {Ya. M. Blanter and F. W. J. Hekking},
journal= {arXiv preprint arXiv:cond-mat/0306706},
year = {2009}
}
Comments
7 pages, 2 figures