Y3Fe5O12 Spin Pumping for Quantitative Understanding of Pure Spin Transport and Spin Hall Effect in a Broad Range of Materials

TL;DR

This paper demonstrates the use of YIG thin films for spin pumping to quantitatively analyze pure spin transport and spin Hall effects across various materials, revealing robust spin conduction especially in antiferromagnetic insulators.

Contribution

It introduces a sputtering-grown YIG thin film technique for dynamic spin transport studies and provides new insights into spin conduction in antiferromagnetic insulators.

Findings

Robust spin conduction observed in AF insulators.

Quantitative determination of spin mixing conductance and spin Hall angle.

YIG spin pumping effectively probes spin Hall physics and SOC in diverse materials.

Abstract

Using Y3Fe5O12 (YIG) thin films grown by our sputtering technique, we study dynamic spin transport in nonmagnetic (NM), ferromagnetic (FM) and antiferromagnetic (AF) materials by ferromagnetic resonance (FMR) spin pumping. From both inverse spin Hall effect (ISHE) and damping enhancement, we determine the spin mixing conductance and spin Hall angle in many metals. Surprisingly, we observe robust spin conduction in AF insulators excited by an adjacent YIG at resonance. This demonstrates that YIG spin pumping is a powerful and versatile tool for understanding spin Hall physics, spin-orbit coupling (SOC), and magnetization dynamics in a broad range of materials.