The nature of ferroelectric domain dynamics in polydomain epitaxial barium titanate thin film was investigated using the linear electro-optic effect. The dynamic response was studied as a function of bias field under pulsed excitation. Upon removal of the bias pulse a millisecond long transient response was observed that is attributed to 90°domain reversal. The dynamic response and its field dependence are described by the Kohlrausch-Williams-Watts stretched exponential function in time with an average relaxation time 〈τ〉. This average time for polarization reversal is a function of applied electric field E and is given by 〈τ〉 = τ0 exp (α/E), where τ0 is the prefactor and α is the activation field. The measured activation fields depended on bias. Activation fields of 2.0 and 0.7 V/μm measured under high and low bias conditions are comparable to those observed for bulk barium titanate.
ASJC Scopus subject areas
- Physics and Astronomy(all)