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Dielectric anomaly due to electrostatic coupling in ferroelectric-paraelectric bilayers and multilayers
 

Summary: Dielectric anomaly due to electrostatic coupling in ferroelectric-paraelectric
bilayers and multilayers
A. L. Roytburd
Department of Materials Science and Engineering, University of Maryland, College Park, Maryland 20740
S. Zhong and S. P. Alpaya
Department of Materials Science and Engineering and Institute of Materials Science, University of
Connecticut, Storrs, Connecticut 06269
Received 18 March 2005; accepted 5 July 2005; published online 22 August 2005
A thermodynamic model is presented that describes the polarization and the dielectric response of
ferroelectric-paraelectric bilayers and multilayers. It is shown that a strong electrostatic coupling
between the layers results in the suppression of ferroelectricity at a critical paraelectric layer
thickness. The bilayer is expected to have a gigantic dielectric response similar to the dielectric
anomaly near Curie­Weiss temperature in homogeneous ferroelectrics at this critical thickness. A
numerical analysis is carried out for a pseudomorphic 001 BaTiO3/SrTiO3 heteroepitaxial bilayer
on 001 SrTiO3 and a stress-free BaTiO3/SrTiO3 bilayer. Complete polarization suppression and a
dielectric peak are predicted to occur at approximately 66% and 14% of SrTiO3 in these two
systems, respectively. © 2005 American Institute of Physics. DOI: 10.1063/1.2032601
Ferroelectric FE multilayers, superlattices, and graded
ferroelectrics have attracted considerable interest in recent
years due to their dramatically different behavior compared

  

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

 

Collections: Materials Science