Structure of BiFeO3 ceramics treated with hot-pressing

Polycrystalline and nanocrystalline grains coexist in the hotpressed BFO samples. ► The E-1 mode evolution corresponds to the shifts in the Bi3+ and Fe3+ ion positions. ► Electromagnons provide long-range interplay between electric polarization and magnetic moment. ► Magnetic modification is due to formation of an incommensurate spiral magnetic structure.