With the new model, the analysis of ferroelectric memory cells for arbitrary variation of the contact voltage is possible. This analysis is performed for a capacitor which is based on the the material of supplier 2, the respective set of parameters is used. Fig. 5.9 shows the current and the charge as functions of time when a voltage step is applied to a capacitor, Fig. 5.10 shows these quantities for a triangular signal with included delay.
Especially in the first of these two figures the behavior of the ferroelectric material leads to a significant difference to a linear dielectric. The dipole relaxation does not follow an exponential function as might have been expected, and the maximum current does not appear immediately after the voltage step. As a consequence of (5.2), the electric field inside the device cannot change immediately, so the entire hysteresis curve has to be swept during the relaxation period, which causes the unexpected smoothness of the charge characteristics and the shift of the maximum current to the right.