We propose a novel Josephson device in which 0 and π states are controlled by an electrical current. In this system, the π state appears in a superconductor/normal metal/superconductor junction due to the non-local spin accumulation in the normal metal which is induced by spin injection from a ferromagnetic electrode. Our proposal offers not only new possibilities for application of superconducting spin-electronic devices but also the in-depth understanding of the spin-dependent phenomena in magnetic nanostructures.
@article{arxiv.cond-mat/0601132,
title = {Controllable pi junction with magnetic nanostructures},
author = {T. Yamashita and S. Takahashi and S. Maekawa},
journal= {arXiv preprint arXiv:cond-mat/0601132},
year = {2009}
}