Controllable pi junction with magnetic nanostructures

TL;DR

This paper introduces a Josephson device where 0 and π states are electrically controlled via spin accumulation in a superconductor/normal metal/superconductor junction, advancing superconducting spintronics.

Contribution

It presents a novel device design that enables electrical control of Josephson states through magnetic nanostructures, combining superconductivity and spintronics.

Findings

Demonstrates control of π state via spin injection

Proposes a new superconducting spin-electronic device

Enhances understanding of spin-dependent phenomena in nanostructures

Abstract

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