Observation of Spin Current Hermiticity

TL;DR

This paper reports the observation of a Hermitian spin current phenomenon caused by interfacial magnetic anisotropies in spin Hall effect systems, demonstrated through experiments on Py and Co bilayers.

Contribution

It introduces the concept of a Hermitian spin current induced by interfacial magnetic anisotropies in spin Hall effect materials, a novel finding in spintronics.

Findings

Observation of anti-polarization of spin current due to interfacial effects

Experimental validation on permalloy and cobalt bilayers

Identification of Hermitian spin current phenomenon

Abstract

The spin Hall effect is one of the most relevant effects in spintronics and the key to conversion from charge current into spin current. We report here a phenomenon, which appears in response to the spin Hall effect and represents the anti-polarization of the spin current due to the coupling between interfacial magnetic anisotropies. Such an effect produces a Hermitian spin current. We realized experiments on permalloy (Py) and Cobalt (Co) bilayers to discuss this phenomenon.