Multiferroic Properties of CaMn$_7$O$_{12}$
  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. 
Guoquan Zhang, Shuai Dong, Zhibo Yan, Yanyan Guo, Qinfang Zhang, Seiji   Yunoki, Elbio Dagotto, and J.-M. Liu
cond-mat.mtrl-sci cond-mat.str-el