Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/16957
Title: Depolarization in modeling nano-scale ferroelectrics using the Landau free energy functional
Authors: Woo, CH
Zheng, Y
Issue Date: 2008
Publisher: Springer
Source: Applied physics. A, Materials science & processing, 2008, v. 91, no. 1, p. 59-63 How to cite?
Journal: Applied physics. A, Materials science & processing 
Abstract: We derived thermodynamically from first principles the free energy functional of a ferroelectric under an applied field E that contains the depolarization field E d. We found that it is crucial to recognize the relationship between the total polarization and the applied field due to the depolarization field when expressing the free energy functional in the Landau form. Ad hoc formulations of ferroelectric models that overlooked this relationship effectively double-count the depolarization field, and thus cause serious overestimation of its effects. Examples are given in which the Curie temperature and the critical thickness of ferroelectricity, etc., can be overestimated this way by orders of magnitude.
URI: http://hdl.handle.net/10397/16957
ISSN: 0947-8396
EISSN: 1432-0630
DOI: 10.1007/s00339-007-4355-4
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