Co/Nb/Co low field superconducting spin switch

TL;DR

This paper demonstrates a Co/Nb/Co superconducting spin switch that operates at liquid helium temperatures, showing an inverse spin switch effect and switching capabilities under weak magnetic fields, with detailed analysis of critical currents.

Contribution

It introduces a Co/Nb/Co spin switch with inverse effect, operational at low temperatures, and provides experimental insights into its critical currents and state control.

Findings

Exhibits inverse spin switch effect

Operates at liquid helium temperature

Switches with weak magnetic fields

Abstract

We report experiments on a superconducting spin switch based on technologically relevant materials as elemental ferromagnetic Co and elemental superconducting Nb. The Co/Nb/Co structure exhibits inverse spin switch effect, can be operated at liquid helium temperature and can switch from superconductive to normal state in rather weak applied magnetic fields. Relevant critical currents as a function of temperature and magnetic field as well as preparation of superconductive or resistive state are addressed here.