Shape demagnetization effect on layered magnetoelectric composites

TL;DR

This paper demonstrates that the in-plane shape of layered magnetoelectric composites significantly influences the ME voltage coefficient due to shape demagnetization effects, impacting device design.

Contribution

It reveals the shape dependence of ME voltage coefficient, combining theoretical analysis and experiments, which was previously oversimplified in models.

Findings

ME voltage coefficient varies with in-plane size and aspect ratio.

Larger in-plane sizes lead to higher ME coefficients.

Shape design can optimize ME device performance.

Abstract

Magnetoelectric (ME) voltage coefficient was always considered independent on in-plane shape of plate layered magnetostrictive-piezoelectric composites due to the oversimplification in ME theoretical models. In this article, we present that in fact the ME voltage coefficient is largely dependent on the in-plane shape owing to shape demagnetization effect on magnetostrictivity. Theoretical analysis and experimental results both indicate that ME voltage coefficient changes notably with the variation of in-plane sizes (length and width) of layered ME properties. ME coefficient increases with the rise of in-plane sizes, and different aspect ratio will also result in different ME coefficient. Proper design of in-plane shape will greatly promote the development of ME devices.