Magnetic Effects on Dielectric and Polarization Behavior of Multiferroic Hetrostructures

TL;DR

This study investigates the magnetic and dielectric properties of PZT/LSMO multiferroic heterostructures, revealing significant frequency-dependent dielectric anomalies and enhanced magnetoelectric interactions influenced by interfacial effects and material inhomogeneity.

Contribution

It provides new insights into the magnetic and dielectric behavior of PZT/LSMO heterostructures, highlighting the role of interfacial effects and inhomogeneity in magnetoelectric coupling.

Findings

High remnant polarization observed (30-54 μC/cm²)

Giant frequency-dependent dielectric changes above the ferromagnetic transition

Enhanced magnetoelectric interaction possibly due to interfacial inhomogeneity

Abstract

PbZr0.52Ti0.48O3/La0.67Sr0.33MnO3(PZT/LSMO) bilayer with surface roughness ~ 1.8 nm thin films have been grown by pulsed laser deposition on LaAlO3(LAO) substrates. High remnant polarization (30-54 micro C/cm2), dielectric constant(400-1700), and well saturated magnetization were observed depending upon the deposition temperature of the ferromagnetic layer and applied frequencies. Giant frequency-dependent change in dielectric constant and loss were observed above the ferromagnetic-paramagnetic temperature. The frequency dependent dielectric anomalies are attributed to the change in metallic and magnetic nature of LSMO and also the interfacial effect across the bilayer; an enhanced magnetoelectric interaction may be due to the Parish-Littlewood mechanism of inhomogeneity near the metal-dielectric interface.