Enhancement of magnetoelectric coupling in Cr doped Mn2O3

TL;DR

This study investigates how Cr doping in Mn2O3 alters its structural, magnetic, dielectric, and magnetoelectric properties, notably enhancing magnetodielectric effects and shifting magnetic transition temperatures.

Contribution

It demonstrates that Cr doping transforms the crystal structure and significantly enhances magnetoelectric coupling in Mn2O3, with detailed analysis of magnetic and dielectric transitions.

Findings

Cr doping changes crystal symmetry from orthorhombic to cubic.

Magnetic transition temperatures shift with Cr content.

Magnetodielectric effect increases by approximately 21% with Cr doping.

Abstract

The effect of Cr doping with nominal compositions Mn2-xCrxO3 (0 less than equal to x less than equal to 0.10) has been undertaken to investigate its effect on structural, magnetic, dielectric and magnetoelectric properties. The Cr doping transformed the room temperature crystal structure from orthorhombic to cubic symmetry. Similar to alpha-Mn2O3, two magnetic transitions have been observed in the Cr doped samples. The effect of Cr doping is significant on the low temperature transition i.e. the lower magnetic transition shifted towards higher temperature (25 K for pristine to 40 K for x=0.10) whereas the high temperature transition decreases slightly with increasing Cr content. A clear frequency independent transition is observed in complex dielectric measurements for all compositions around high temperature magnetic ordering. Interestingly, the magnetodielectric behaviour enhanced enormously approx 21% with Cr substitution as compared to pristine Mn2O3.