Huge nonequilibrium magnetoresistance in hybrid superconducting spin valves

TL;DR

This paper proposes a hybrid ferromagnet-superconductor spin valve that exhibits extremely high tunnel magnetoresistance, driven by nonequilibrium transport and exchange coupling, promising for low-temperature spintronics.

Contribution

It introduces a new hybrid spin valve design leveraging nonequilibrium effects to achieve unprecedented magnetoresistance levels, enhancing spintronic device performance.

Findings

Magnetoresistance values up to 10^6% are achievable.

The device operates effectively under proper voltage biasing.

The structure offers controllable spin-filter properties.

Abstract

A hybrid ferromagnet-superconductor spin valve is proposed. Its operation relies on the interplay between nonequilibrium transport and proximity-induced exchange coupling in superconductors. Huge tunnel magnetoresistance values as large as some 10^6% can be achieved in suitable ferromagnet-superconductor combinations under proper voltage biasing. The controllable spin-filter nature of the structure combined with its intrinsic simplicity make this setup attractive for low-temperature spintronic applications where reduced power dissipation is an additional requirement.