The Preparation And Property Reserch Of Dy Doped Bi₅Ti₃FeO₁₅ Thin Film

An Bismuth-layered perovskitestructure plays more and more important role in the research of single-phase multiferroic materials field. Recently Bi5Ti3FeO15 has received the widespread attention Due to good performance and the magnetoelectric coupling effect. However, the magnetic properties of this material are not good enough, and it’s magnetoelectric coupling effect is still wake. So it is necessary to pay more attention for the further exploration and research. In this work, we try to improve the properties of BTFO by rare earth elements doping process. This paper will introduce the preparation, structure, electricity, magnetism, magnetoelectric effect and photovoltaic effect of BTFO thin film, and analyzed the influence of the doping of the rare earth elements dysprosium (Dy).The pure and Dy doped Bi5Ti3FeO15 films were prepared by sol-gel method. The ferroelectric, ferromagnetic, and magnetoelectric properties were investigated. It is shown that Dy doped Bi5Ti3FeO15 films display improved ferroelectric and ferromagnetic properties compared with the pure Bi5Ti3FeO15 films. The remanent polarization of BDTFO thin film in about 2-3tims of the pure BTFO film,and leakage current intensity decreased 1-2 orders of magnitude, saturated magnetization and remanent magnetization have greatly ascend and the magnetoelectric effect is obviously enhanced after doping with Dy. Thus improved performance is correlated.to the reduction of oxygen vacancies and the lattice distortion by Dy-ion doping into the Bi-site.In addition, we also made of thin film photovoltaic response study, the results showed that the samples Dy doped lead to narrow band gap, spectral response occurred red shift.The present results suggest a new candidate for multiferroic materials with magnetoelectric coupling effect at room temperature.