Structure and multiferroic properties of barium hexaferrite ceramics

► Large ferroelectricity and strong ferromagnetism were observed in barium hexaferrite ceramics. ► The maximum remanent polarization of the BaFe12O19 ceramic was estimated to be 11.8 μC cm−2. ► The FeO6 octahedron and off-center shift of Fe3+ are suggested to be the origin of the polarization.