Electric and magnetic properties of multiferroic (BiFeO3)1−x–(PbTiO3)x films prepared by the sol–gel process

(BiFeO3)1-x-(PbTiO3)x solution films have been prepared on LaNiO3/SiO2/Si substrates by the sol-gel process at an annealing temperature of 500 deg C. X-ray diffraction patterns indicate that a cubic phase transition occurs in the film with x = 0.1. Cross section scanning shows the thickness of the films is about 470 nm. Coexistent ferroelectricity and magnetism at room temperature are observed by measuring ferroelectricity and magnetism. The study of ferroelectricity indicates that the remnant polarization and applicable drive field are increased by the ratio x of PbTiO3. The film with x = 0.05 has the maximum saturation magnetization. In addition, dielectric property as a function of frequency is studied.