Acoustically driven ferromagnetic resonance

TL;DR

This paper demonstrates the all-elastic excitation and detection of ferromagnetic resonance using surface acoustic waves in a nickel/lithium niobate hybrid device, revealing a strain-induced magnetization precession mechanism.

Contribution

It introduces a novel method for driving ferromagnetic resonance via surface acoustic waves in a hybrid device, supported by experimental and theoretical analysis.

Findings

SAW magneto-transmission measured at room temperature

FMR driven by strain-induced tickle field

Magnetic field orientation dependence observed

Abstract

Surface acoustic waves (SAW) in the GHz frequency range are exploited for the all-elastic excitation and detection of ferromagnetic resonance (FMR) in a ferromagnetic/ferroelectric (nickel/lithium niobate) hybrid device. We measure the SAW magneto-transmission at room temperature as a function of frequency, external magnetic field magnitude, and orientation. Our data are well described by a modified Landau-Lifshitz-Gilbert approach, in which a virtual, strain-induced tickle field drives the magnetization precession. This causes a distinct magnetic field orientation dependence of elastically driven FMR that we observe in both model and experiment.