Electric-field tunable spin waves in PMN-PT/NiFe heterostructure: experiment and micromagnetic simulations

TL;DR

This study combines experiments and micromagnetic simulations to demonstrate voltage-controlled spin wave resonance in PMN-PT/NiFe heterostructures, revealing tunable magnetic dynamics via electric fields.

Contribution

It provides the first comprehensive experimental and theoretical analysis of electric-field tunable SSWR in multiferroic heterostructures, including detailed mode distributions.

Findings

Electric field shifts FMR and SSWR resonance fields.

Good agreement between experiments and simulations.

Simulations reveal amplitude and phase distributions of modes.

Abstract

We present a comprehensive theoretical and experimental study of voltage-controlled standing spin waves resonance (SSWR) in PMN-PT/NiFe multiferroic heterostructures patterned into microstrips. A spin-diode technique was used to observe ferromagnetic resonance (FMR) mode and SSWR in NiFe strip mechanically coupled with a piezoelectric substrate. Application of an electric field to a PMNPT creates a strain in permalloy and thus shifts the FMR and SSWR fields due to the magnetostriction effect. The experimental results are compared with micromagnetic simulations and a good agreement between them is found for dynamics of FMR and SSWR with and without electric field. Moreover, micromagnetic simulations enable us to discuss the amplitude and phase spatial distributions of FMR and SSWR modes, which are not directly observable by means of spin diode detection technique.