Ferroelectric Properties in Multiferroic BiFeO₃ Thin Films Codoped with La and Co

Abstract

BiFeO₃, LO₂a-doped BiFeO₃, and (La, Co)-codoped BiFeO₃ thin films were fabricated on Pt/Ti/SiO₂/Si(111) substrates by chemical solution deposition method. The structural and electrical properties of pure, La-doped, and (La, Co)-codoped BiFeO₃ thin films were studied. X-ray diffraction analysis showed that all the films were single perovskite structure. Electrical measurements indicated that the ferroelectric properties of BiFeO₃ thin films were significantly improved by La and Co codoping. Well saturated hysteresis characteristic with large remanent polarization (larger than 57 μC/cm²) were observed in Bi_0.9La_0.1Co_0.1Fe_0.9O₃ thin film.

Keywords:

• Multiferroicity
• ferroelectricity
• BiFeO₃

Acknowledgments

This work has been supported by the Science and Technology Planning Project of Guangdong Province of China under Grant No. 2008B010600041, the Natural Science Foundation of Guangdong Province of China under Grant No. 8151027501000068.