Magnetoelectric behavior of BaTiO3 films directly grown on CoFe ₂O₄ ceramics

BaTiO₃ films were grown on highly dense CoFe₂O ₄ 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.