We report that CaMn7O12 is a new magnetic multiferroic material. The appearance of a ferroelectric polarization coinciding with the magnetic phase transition (∼90 K) suggests the presence of ferroelectricity induced by magnetism, further confirmed by its strong magnetoelectric response. With respect to other known magnetic multiferroics, CaMn7O12 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.
@article{arxiv.1101.2276,
title = {Multiferroic Properties of CaMn$_7$O$_{12}$},
author = {Guoquan Zhang and Shuai Dong and Zhibo Yan and Yanyan Guo and Qinfang Zhang and Seiji Yunoki and Elbio Dagotto and J. -M. Liu},
journal= {arXiv preprint arXiv:1101.2276},
year = {2011}
}