Abstract
Piezoresponse force microscopy has been applied for the study of ferroelectric properties of lithium niobate thin films. The films have been obtained on a silicon surface {110}, coated with a thin layer of SiO2 using high-frequency magnetron spraying of lithium niobate. It has been demonstrated that after polarization of a sample surface segment with positive or negative potential using a conductive probe of an atomic force microscope the effect of propagation (spreading) of the region of grain polarized state with a decrease in the piezoresponse amplitude is observed. Moreover, the polarization occurs stepwise, that is, the Barkhausen effect takes place at the nanometer level.
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