Local Piezoresponse and Thermal Behavior of Ferroelastic Domains in Multiferroic BiFeO3 Thin Films by Scanning Piezo-Thermal Microscopy. - Yu Hui-Zhu; Chen Hong-Guang; Xu Kun-Qi; Zhao Kun-Yu; Zeng Hua-Rong; Li Guo-Rong (Chinese Physics Letters, 2014)