Separating Inverse spin Hall voltage and spin rectification voltage by inverting spin injection direction

TL;DR

This paper introduces a universal, simple method to distinguish inverse spin Hall effect signals from spin rectification effects by inverting spin injection direction, applicable across various frequencies and sample types.

Contribution

The authors propose a novel approach based on the opposite dependence of ISHE and SRE on spin injection direction, enabling straightforward separation without complex fitting.

Findings

Effective separation of ISHE and SRE signals demonstrated

Method applicable over a wide frequency range

No need for fitting to specific line shapes

Abstract

We develop a method for universally resolving the important issue of separating the inverse spin Hall effect (ISHE) from spin rectification effect (SRE) signal. This method is based on the consideration that the two effects depend on the spin injection direction: The ISHE is an odd function of the spin injection direction while the SRE is independent on it. Thus, inversion of the spin injection direction changes the ISHE voltage signal, while SRE voltage remains. It applies generally to analyzing the different voltage contributions without fitting them to special line shapes. This fast and simple method can be used in a wide frequency range, and has the flexibility of sample preparation.