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Title: Curie-Weiss law in thin-film ferroelectrics
Authors: Wang, B
Woo, CH 
Issue Date: 15-Aug-2006
Source: Journal of applied physics, 15 Aug. 2006, v. 100, no. 4, 044114, p. 1-5
Abstract: The stationary self-polarization field of a thin film in an open circuit is analytically solved for temperatures near the para-/ferroelectric transformation within the Ginzburg-Landau theory. For second-order ferroelectrics, or first-order ferroelectrics with a sufficiently large elastic self-energy of the transformation strain, the solution is real and stable, from which the corresponding electric susceptibility of the film can be derived. A Curie-Weiss-type relation of the permittivity is obtained for both the supercritical and subcritical temperature regimes near the transition. In the paraelectric state, the Curie parameter of the thin film is found to be independent of its thickness, whereas in the ferroelectric state, its magnitude decreases rapidly with decreasing film thickness.
Keywords: Ferroelectric thin films
Dielectric polarisation
Ferroelectric transitions
Ginzburg-Landau theory
Optical susceptibility
Permittivity
Ferroelectric Curie temperature
Publisher: American Institute of Physics
Journal: Journal of applied physics 
ISSN: 0021-8979
EISSN: 1089-7550
DOI: 10.1063/1.2336979
Rights: © 2006 American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. The following article appeared in B. Wang & C. H. Woo, J. Appl. Phys. 100, 044114 (2006) and may be found at http://link.aip.org/link/?jap/100/044114.
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