%0 Journal Article %K Manganese compounds %K Hysteresis %K Defects %K Ferroelectric films %K Magnetic materials %K Ferroelectric thin films %K Spatially resolved %K Domain nucleation %K Ambient environment %K Defect cluster %K Electrostatic effect %K Local defects %K Piezoresponse %K Single defect %K Electrostatics %K Semiconducting bismuth compounds %K Vacuum %K Hysteresis loops %A P Maksymovych %A N Balke %A S Jesse %A M Huijben %A Ramamoorthy Ramesh %A A.P Baddorf %A S.V Kalinin %B Journal of Materials Science %D 2009 %G eng %P 5095-5101 %R 10.1007/s10853-009-3697-z %T Defect-induced asymmetry of local hysteresis loops on BiFeO3 surfaces %V 44