%0 Journal Article %K Transmission electron microscopy %K Crystal structure %K Polarization %K Bismuth compounds %K Ferroelectricity %K Ferroelectric films %K Piezoforce microscopy %K Epitaxial films %K Ferroelectric size effects %K Monoclinic phases %A Y.H Chu %A T Zhao %A M.P Cruz %A Q Zhan %A P.L Yang %A L.W Martin %A M Huijben %A C.H Yang %A F Zavaliche %A H Zheng %A Ramamoorthy Ramesh %B Applied Physics Letters %D 2007 %G eng %R 10.1063/1.2750524 %T Ferroelectric size effects in multiferroic BiFeO3 thin films %V 90