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Piezoresponse force microscopy (PFM) images of as-grown domain structures. Lateral PFM contrast on nonpolar surfaces of β-glycine representing three types of as-grown domain structures: (a) Strip-like domains with flat charged domain walls, (b) quasiperiodic ensembles of needle-like domains, and (c) large domains with irregular-shaped domain walls. Red and blue arrows indicate the direction of spontaneous polarization. Arrows b and c show the directions of crystal axis.
