Multiferroicity and magnetoelastic coupling in alpha-Mn2O3: A binary perovskite

TL;DR

This study demonstrates multiferroicity and magnetoelectric coupling in alpha-Mn2O3, a binary perovskite, revealing temperature-dependent structural distortions and magnetic-electric interactions relevant for multifunctional device applications.

Contribution

It provides the first evidence of multiferroicity and magnetoelastic coupling in alpha-Mn2O3, a unique binary perovskite, with detailed structural and dielectric analysis.

Findings

Dielectric permittivity transition at 80K linked to AFM order

Electric polarization can be modulated by magnetic field

Structural distortions increase with decreasing temperature

Abstract

Multiferroics where at least two primary ferroic orders are present and coupled in a single system constitute an important class of materials. They attracted special consideration as they present both intriguing fundamental physics problems and technological importance for potential multifunctional devices. Here, we present the evidence of multiferroicity and magnetoelectric (ME) coupling in alpha-Mn2O3; a unique binary perovskite. Corresponding to the antiferromagnetic (AFM) ordering around 80K, a clear frequency independent transition is observed in the dielectric permittivity. We showed that electric polarization emerges near AFM regime that can be modulated with magnetic field. The detailed structural analysis using synchrotron radiation X-ray diffraction demonstrates the increase in structural distortion with decreasing temperature, as well as changes in the unit cell parameters and bond lengths across the ferroelectric and magnetic ordering temperatures. This observation of multiferroicity and magnetoelastic coupling in alpha-Mn2O3 provides insights for the exploration of ME coupling in related materials.