Dynamic response and hysteresis dispersion scaling of ferroelectric SrBi₂Ta₂O₉ thin films

The dynamic hysteresis response of ferroelectric SrBi₂Ta₂O₉ thin films versus periodically varying electric field over a frequency range of f=10^-1–10⁶ Hz and amplitude range of E₀=15–158 kV/cm is measured utilizing the Sawyer–Tower method. The dynamic order parameter Q shows anomalous behavior against the field amplitude, and a single-peaked hysteresis dispersion is identified. The field response of hysteresis area in the form of ∝f^2/3E₀^2/3 over the low frequency range is evaluated, while the response over the high frequency range takes the form of ∝f^-1/3E₀². We demonstrate that the hysteresis dispersion spectrum exhibits single-parameter scaling, and predicts a characteristic time for domain reversal that is inversely correlated to the field amplitude. © 2003 American Institute of Physics.