Fig. 5
From: Piezo-generated charge mapping revealed through direct piezoelectric force microscopy
Piezogenerated charge of bismuth ferrite (BFO) a PFM phase image of a 400 nm thick BiFeO3 (BFO) ferroelectric film in which two zones of opposite polarization were previously recorded. b DPFM-Si image and c DPFM-So image of the prerecorded areas, scale bar 2.5 μm. The inner, smallest square presents the largest current output, as we are crossing between two domains fully polarized in opposite directions. Accordingly, when crossing the large outer square border a lower current is recorded, as we are crossing from a virgin state to a fully polarized domain. d Mean-profile of the dot-line squared area A- in b- top and Mean profile of the dot-line square B of c. Both profiles where directly integrated to obtain the piezogenerated charge
