Effect of Ce and Zr codoping on the multiferroic properties of BiFeO3 thin films Jun Liu, Meiya Li, Ling Pei, Jing Wang, Zhongqiang Hu, Xiao Wang and Xingzhong Zhao EPL, 89 5 (2010) 57004 Published online: 23 March 2010 DOI: 10.1209/0295-5075/89/57004