5.5.1 Frequency and Amplitude Dependence of the Coercive Field

The analysis of the frequency and amplitude dependence of the coercive field provides an introduction to the complexity of response properties. A triangular signal is applied to a ferroelectric capacitor. The parameter set used is extracted from the measurements outlined in Fig. 5.1. Depending on the amplitude of the input signal, different ratios between frequency and coercive field are obtained (Fig. 5.5). The most obvious nonlinear effect in the plotted area is that, due to hysteresis, the coercive field does not grow linearly if the applied amplitude is increased.

Figure 5.5: Coercive voltage as a function of frequency and peak voltage