Utilizing an atomic force microscope (AFM), we observed the cleavage surface of triglycine sulfate [TGS; (NH2CH2COOH)3H2SO4.] cleaved near Curie point in the atmosphere. Adopting the constant height mode in the repulsive force region, the contrast of lenticular domain patterns reversed for the opposite direction scans parallel to the cleavage direction. The change in the contrast may result from the difference in the frictional force due to the structure of the ferroelectric domains on the cleavage surface.
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