Multiferroic Properties of CaMn$_7$O$_{12}$

TL;DR

CaMn$_7$O$_{12}$ is identified as a new magnetic multiferroic with high ferroelectric transition temperature and strong magnetoelectric effects, opening new avenues for multiferroic material discovery.

Contribution

This study reports CaMn$_7$O$_{12}$ as a novel multiferroic with unique properties, expanding the known materials in this class.

Findings

Ferroelectric polarization appears at ~90 K coinciding with magnetic transition.

CaMn$_7$O$_{12}$ exhibits strong magnetoelectric response.

High ferroelectric critical temperature and large polarization observed.

Abstract

We report that CaMn$_7$O$_{12}$ is a new magnetic multiferroic material. The appearance of a ferroelectric polarization coinciding with the magnetic phase transition ($\sim90$ K) suggests the presence of ferroelectricity induced by magnetism, further confirmed by its strong magnetoelectric response. With respect to other known magnetic multiferroics, CaMn$_7$O$_{12}$ displays attractive multiferroic properties, such as a high ferroelectric critical temperature and large polarization. More importantly, these results open a new avenue to search for magnetic multiferroics in the catalogue of doped oxides.