n these measurements, the conducting PFM tip is scanned in a con- tact mode while an ac voltage is applied between the tip and a counter electrode. The piezoresponse contrast is acquired in the form of the mixed signal A cos u, with A being the am- plitude of the piezoelectric vibration and u being the phase shift between the driving and detected signals. 21 In this way, polarizations with opposite directions exhibit contrasts of op- posite signs
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