Acoustic excitation and electrical detection of spin waves and spin currents in hypersonic bulk waves resonator with YIG/Pt system

TL;DR

This paper presents a semi-analytical model for magnetoelastic excitation and electrical detection of spin waves in a hypersonic bulk acoustic wave resonator with a YIG/Pt system, correlating theory with experimental data.

Contribution

It introduces a comprehensive semi-analytical theory linking magnetoelastic effects with electrical detection in hypersonic resonators, and determines optimal YIG thickness for maximum spin current detection.

Findings

Theoretical and experimental frequency-field dependence correlation.

Determination of magnetic and magnetoelastic parameters of YIG.

Identification of optimal YIG thickness for maximal ISHE voltage.

Abstract

We report on the self-consisted semi-analytical theory of magnetoelastic excitation and electrical detection of spin waves and spin currents in hypersonic bulk acoustic waves resonator with ZnO-GGG-YIG/Pt layered structure. Electrical detection of acoustically driven spin waves occurs due to spin pumping from YIG to Pt and inverse spin Hall (ISHE) effect in Pt as well as due to electrical response of ZnO piezotransducer. The frequency-field dependences of the resonator frequencies and ISHE voltage $U_{ISHE}$ are correlated with experimental ones observed previously. Their fitting allows to determine some magnetic and magnetoelastic parameters of YIG. The analysis of the YIG film thickness influence on $U_{ISHE}$ gives the possibility to find the optimal thickness for maximal $U_{ISHE}$ value.