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Spatially resolved polarization switching of variable-thickness BiFeO3 following TAFM. (A) BiFeO3 film thickness (h) and (B) cross-sectional HAADF-STEM of BiFeO3 following TAFM showing unperturbed crystal structure. (C) Coercive voltage, Vc and (D) coercive field, Ec cospatial with A, determined at the onset of ferroelectric switching from P− to P+ polarization.
