Multiferroicity with high-Tc in ceramics of the YBaCuFeO5 ordered perovskite

TL;DR

This study reports high-temperature multiferroicity in YBaCuFeO5 ceramics, demonstrating magnetism-induced electric polarization and magnetodielectric effects near 230 K, with potential for room-temperature electric control in magnetic materials.

Contribution

It reveals multiferroic behavior in YBaCuFeO5 ceramics with a high transition temperature, highlighting magnetism-induced polarization and magnetodielectric effects in an ordered perovskite.

Findings

Dielectric anomaly near 230 K linked to magnetic transition

Electric polarization induced by magnetic order below 230 K

Strong magnetic field dependence of dielectric properties

Abstract

A dielectric anomaly has been found near the incommensurate to commensurate antiferromagnetic phase transition (TN2=230 K) in YBaCuFeO5 ceramics, a compound which crystallizes in an ordered perovskite structure. The existence of electric polarization below TN2 suggests the magnetism induced charge polarization effect that is also confirmed by its strong magnetic field dependence below TN2. Accordingly, the peak near TN2 of the magnetodielectric effect indicates a maximum of magnetodielectric susceptibility near the spin reorientation transition. Considering the abundance of magnetic compounds which structures derive from the perovskite, these results might open up the way toward the control of electric polarization near room temperature.