fig1

Figure 1. (A) PFM out-of-plane amplitude image of the sectioned and polished (001) surface of the BiFeO₃ crystal. (B) Low magnification BF-STEM image of a (110) FIB-prepared lamella. (C) Low magnification BF-STEM image of a (010) FIB-prepared lamella. Arrows in (B and C) point towards increasing thickness. Examples of continuity of domain walls, where a sawtooth wall changes direction and becomes a flat wall, are marked by x in (A and B). Scale bars are 100 nm.