Adjustable ferroelectric properties in paraelectric/ferroelectric/paraelectric trilayers

A trilayer paraelectric/ferroelectric/paraelectric system is studied within the framework of the Ginzburg–Landau–Devonshire theory in consideration of the elastic interactions between each layer. An analytic expression of the ferroelectric phase transition temperature for the ferroelectric layer is derived. The polarization, dielectric properties and the response to the external field are studied numerically. Our results show that there are two types of thickness effects on the properties of the film considering the effect of dislocation. By changing the thickness of each layer, the ferroelectric layer can be highly adjusted and may have very good potential applications such as transducers, sensors and actuators.