Giant magnetoelectric effect under high bias fields in cylindrical bilayered Ni-PZT composites

TL;DR

This paper reports a novel cylindrical Ni-PZT magnetoelectric composite that exhibits a significant ME effect under high bias magnetic fields due to volume magnetostriction, making it promising for high-field sensors.

Contribution

It introduces a new cylindrical bilayered ME composite structure that shows high-field ME effects, expanding the understanding of magnetostriction contributions in such materials.

Findings

ME voltage coefficient increases linearly with bias field after 1 kOe.

High ME effect observed under high magnetic fields due to volume magnetostriction.

Cylindrical composite shows potential for high magnetic field sensor applications.

Abstract

For conventional plate and disc layered magnetoelectric (ME) composites, the ME effect appeared under low bias magnetic fields, which caused by line magnetostriction. In this paper, we present a new structure ME composites, cylindrical bilayered composites. Unexpectedly, the ME effect also appeared under high magnetic fields in this cylindrical bilayered Ni-lead zirconate titanate (PZT) composite. We thought this ME effect caused by volume magnetostriction. The results showed that the ME voltage coefficient of the cylindrical bilayered composite of Ni-PZT was the sum of aE(l) caused by line magnetostriction under low bias fields and aE(w) induced by volume magnetostriction under high fields. At the resonance frequency, aE,A(w) increased linearly with bias magnetic field HDC to 30 V/cm Oe at HDC =8 kOe, and was much larger than aE,A(l) at Hm=0.6 kOe. The novel characteristic of ME voltage coefficient increased linearly with the rise of HDC after 1 kOe in axial mode makes the cylindrical composite a promising candidate for application in high magnetic field sensor.