Measurement of spin pumping voltage separated from extrinsic microwave effects

TL;DR

This paper presents methods to accurately measure inverse spin Hall effects induced by spin pumping, effectively separating these signals from extrinsic microwave effects to advance spintronics research.

Contribution

It introduces techniques to distinguish spin pumping signals from microwave-induced artifacts, improving measurement accuracy in spin-charge conversion studies.

Findings

Methods to separate extrinsic microwave effects from spin pumping signals.

Enhanced accuracy in measuring inverse spin Hall effects.

Facilitation of quantitative spin-charge conversion analysis.

Abstract

Conversions between spin and charge currents are core technologies in recent spintronics. In this article, we provide methods for estimating inverse spin Hall effects (ISHEs) induced by using microwave-driven spin pumping (SP) as a spin-current generator. ISHE and SP induce an electromotive force at the ferromagnetic or spin-wave resonance, which offers a valuable electric way to study spin physics in materials. At the resonance, a microwave for exciting the magnetization dynamics induces an additional electromotive force via rf-current rectification and thermoelectric effects. We discuss methods to separate the signals generated from such extrinsic microwave effects by controlling sample structures and configurations. These methods are helpful in performing accurate measurements on ISHE induced by SP, enabling quantitative studies on the conversion between spin and charge currents on various kinds of materials.