Effects of annealing temperature on the structures, ferroelectric and magnetic properties of Aurivillius Bi5Ti3FeO15 polycrystalline films

► Effects of annealing temperature on physical properties of BTF films were studied. ► Improved multiferroic properties were shown with annealing temperature. ► Ferroelectricity strongly depended on the growth orientation of the BTF films. ► Possible factors were proposed to explain the improved multiferroic properties.