Frequency Dependence of Magnetoelectric Interactions in Layered Structures of Ferromagnetic Alloys and Piezoelectric Oxides

TL;DR

This paper investigates how magnetoelectric interactions in layered ferromagnetic and piezoelectric structures depend on frequency, highlighting a giant resonance effect that significantly enhances magnetic-to-electric field conversion.

Contribution

It demonstrates the frequency dependence of ME coupling in layered structures and identifies electromechanical resonance as a key factor for enhanced interactions.

Findings

Giant ME coupling at electromechanical resonance with a voltage coefficient of 90 V/cm Oe

ME interactions are stronger for transverse fields than longitudinal fields

Resonance significantly increases magnetic-to-electric conversion efficiency

Abstract

Magnetoelectric (ME) interactions in layered structures of magnetostrictive and piezoelectric phases are mediated by mechanical deformation. Here we discuss the frequency dependence of ME coupling in bilayers and trilayers of Permendur, a ferromagnetic alloy, and lead zirconate titanate. Data on ME voltage coefficient versus frequency profiles reveal a giant ME coupling at electromechanical resonance. The maximum voltage coefficient of 90 V/cm Oe is three orders of magnitude higher than low-frequency values. The ME interactions for transverse fields is an order of magnitude stronger than for longitudinal fields. These results are in agreement with theory. The resonance ME effect, therefore, is a novel tool for enhancing the magnetic-to-electric field conversion efficiency in the composites.