Ferroelectric hysteresis measurement at 1 kHz for (001)-, (110)-, and (111)-oriented BFO films (squares, circles, and triangles, respectively); (a) polarization and (b) and corresponding current vs electrical field .
Switched polarization as a function of switching time for different electric fields measured on 300 nm thick epitaxial BFO films with (a) (001), (b) (110), and (c) (111) orientations. Solid lines are fits to the KAI model. The applied fields are ◼117 kV/cm, ●133 kV/cm, △150 kV/cm, ▼167 kV/cm, ◇183 kV/cm, ◁200 kV/cm, and ▷233 kV/cm (Not all measured curves are shown).
Field dependence of the fitting parameters; (a) normalized polarization , (b) dimensionality factor , and (c) characteristic time from the KAI model for (001)-, (110)-, and (111)-oriented BFO films from Fig. 2 (squares, circles, and triangles, respectively).
Activation field and in the high and low field regimes, respectively, obtained from the fits (solid lines) in Fig. 2(c). For comparison, the values for epitaxial (001)-PZT are and (Ref. 21).
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