Electric and magnetic properties of CoFe2O4 /Pb (Zr0.52Ti0.48)O3 bilayer thin films prepared by pulsed-laser deposition

CoFe2O4 (CFO) thin film with highly (111)-preferential orientation was first deposited on the silicon substrate by a pulsed-laser deposition, and then Pb(Zr0.52Ti0.48)O3 (PZT) layers were deposited with different oxygen pressures to form the bilayer CFO/PZT nanocomposite thin films. X-ray diffraction showed that the PZT preferential orientation was strongly dependant on the oxygen pressure. The smooth film surface was obtained after depositing the CFO and PZT layers. The bilayer thin films exhibit good ferromagnetic and ferroelectric properties, and a low leakage current density of 0.004 μA/cm2 at 50 kV/cm. The leakage current density curves show loops for the electric polarized field when the electric field reverses.