Abstract
We consider a bulk system of ferroelectric bilayer with an antiferroelectric interface coupling between two similar materials which have second-order phase transitions. Landau theory and Landau-Khalatnikov equation are used to study the dynamic switching phenomenon of this ferroelectric bilayers under a step electric field. A bilinear coupling that achieved a symmetry condition is taken into account in the Landau free-energy expression. We found that switching time is decreased for the system of weak antiferroelectric interface coupling, as well as for the system when the thickness ratio between the two layers is large. It is shown here by dynamic switching that the polarization reversal occurs in one step in the contrary to the static dielectric hysteresis loop. Negative and positive peaks of switching current is discussed.