Inverse spin galvanic effect in proximitized superconductor/paramagnet systems

TL;DR

This paper investigates how spin-orbit coupling and paramagnetic effects in superconductor/paramagnet systems lead to an inverse spin galvanic effect, generating magnetic moments from charge currents, with implications for experimental observations.

Contribution

It introduces the concept of inverse spin galvanic effect in proximitized superconductor/paramagnet systems, highlighting the role of SOC and temperature in magnetic response.

Findings

Magnetic response can be diamagnetic or paramagnetic depending on SOC sign and temperature.

The phenomenon explains recent experimental results in Pt/Nb heterostructures.

Sign change in magnetic response observed in Ag/Nb cylinders is discussed.

Abstract

We show that the interplay between spin-orbit coupling (SOC) and the paramagnetic response of itinerant electrons in proximitized superconductor/paramagnet systems gives rise to the inverse spin galvanic effect, i.e. generation of magnetic moment under the influence of the charge current. Depending on the sign of the SOC constant and the system temperature, the corresponding contribution to the magnetic response of the superconductor can be either diamagnetic or paramagnetic. We discuss the relevance between the discovered phenomena and the recent experiments on Pt/Nb heterostructures as well as the puzzling sign change of the magnetic response observed in clean Ag coated Nb cylinders.