Size Effects of the Properties in a Ferroelectric Bilayer Film with Surface Transition Layers

摘要

Using the transverse [sing model theory,a ferroelectric bilayer film,considering the surface transition layer within each constituent slab and an interracial coupling between two slabs,is investigated in the framework of the mean-field approximation.We discuss in detail the thickness effects of the spontaneous polarization and dielectric susceptibility ofa ferroelectric bilayer film under two conditions of interracial coupling:ferroelectric and antiferroelectric coupling.The results show some unexpected phenomena for a small thickness of a ferroelectric bilayer film.