Magnetoelectric behavior of BaTiO3 films directly grown on CoFe2O4 ceramics

BaTiO3 films were grown on highly dense CoFe2O4 ceramics via pulsed laser deposition. Microstructural characterization showed that polycrystalline BaTiO3 thin films with grain size of about 70 nm were grown on the CoFe2O4 ceramics. BaTiO3 films showed good ferroelectric feature. An obvious magnetoelectric response, which had the same bias-dependent trend as the piezomagnetic coupling coefficient of CoFe2O4 ceramics, was observed in the multiferroic film-ceramic composites. Phenomenological theoretical analysis shows that there is plenty of room for further enhancing the magnetoelectric response of such film-substrate composites. (C) 2008 American Institute of Physics.