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Interface effects in ferroelectric bilayers and heterostructures I. B. Misirlioglu

Summary: Interface effects in ferroelectric bilayers and heterostructures
I. B. Misirlioglu
Max Planck Institute for Microstructure Physics, Weinberg, 06120 Halle-Saale, Germany
G. Akcay, S. Zhong, and S. P. Alpaya
Institute of Materials Science, University of Connecticut, Storrs, Connecticut 06269
Received 29 November 2006; accepted 30 November 2006; published online 9 February 2007
We study the role of interlayer interfaces on the polarization response of ferroelectric-paraelectric
bilayers using a nonlinear thermodynamic model. We carry out a numerical analysis for prototypical
BaTiO3­SrTiO3 bilayers ranging from 40 to 800 nm total thickness as a function of SrTiO3
fraction. There exists a critical fraction of SrTiO3 at which the polarization is suppressed due to the
depolarization field arising from the interlayer coupling and a large dielectric response is predicted.
It is shown that this critical fraction decreases with decreasing total bilayer thickness, indicating that
the interfacial effects are more pronounced in thinner bilayers. © 2007 American Institute of
Physics. DOI: 10.1063/1.2433766
Artificial ferroelectric FE heterostructures such as bi-
layers, superlattices, and graded films have attracted a great
deal of interest due to their unusual behavior compared to
their constituents in bulk or single-crystal form. Increases in
the remnant polarization and extremely high dielectric re-
sponse have been reported in a variety of FE-paraelectric


Source: Alpay, S. Pamir - Department of Materials Science and Engineering, University of Connecticut


Collections: Materials Science