Controllable pi junction with magnetic nanostructures

Abstract

We propose a novel Josephson device in which 0 and $\ddot{I}€$ states are controlled by an electrical current. In this system, the $\ddot{I}€$ 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.

4 pages, 3 figures