Abstract
Bi3.15Nd0.85Ti3O12 (BNT) ferroelectric thin film was fabricated on Pt(111)/Ti/SiO2/Si substrate using pulsed laser deposition. Domain structure, domain switching and hysteresis loops of the BNT film were investigated via piezoresponse force microscopy (PFM). Clear domain structure, complete domain switching and strong piezoresponse are found in BNT film. The PFM images before and after poling illustrate that domain structure and domain switching are restricted by grain boundaries. The shifted P-V hysteresis loops and butterfly loops indicate that internal field exists in the prepared BNT film. Both grain boundaries and internal field affect domain switching of the polycrystalline BNT film.
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