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Surface effect on domain wall width in ferroelectrics

J. Appl. Phys. 106, 084102 (2009); doi:10.1063/1.3236644

Published 26 October 2009

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Eugene A. Eliseev,1 Anna N. Morozovska,1 Sergei V. Kalinin,2 Yulan Li,3 Jie Shen,4 Maya D. Glinchuk,1 Long-Qing Chen,3 and Venkatraman Gopalan3
1Institute for Problems of Materials Science, National Academy of Science of Ukraine, 3, Krjijanovskogo, Kiev 03142, Ukraine
2The Center for Nanophase Materials Sciences and Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
3Department of Materials Science and Engineering, Pennsylvania State University, University Park, Pennsylvania 16802, USA
4Department of Mathematics, Purdue University, West Lafayette, Indiana 47907, USA
We study the effect of the depolarization field on a domain wall structure near the surface of a ferroelectric. Since in real situation bound and screening charges form an electric double layer, the breaking of this layer by the domain wall induces stray depolarization field, which in turn changes the domain wall structure. Power law decay of the stray field results in the power law of polarization saturation near the surface, as compared to exponential saturation in the bulk. Obtained results predict that the surface broadening of ferroelectric domain walls appeared near Curie temperature as well as describe domain wall depth profile in weak ferroelectrics. We qualitatively describe extra-broad domain walls near LiNbO3 and LiTaO3 surfaces observed experimentally at room temperature, which probably originate at high temperatures but did not fully relax their width with temperature decrease allowing for lattice pinning and defect centers. Thus results have broad implication for fundamental issues such as maximal information storage density in ferroelectric data storage, domain wall pinning mechanisms at surfaces and interfaces, and nucleation dynamics. ©2009 American Institute of Physics
History: Received 19 July 2009; accepted 27 August 2009; published 26 October 2009
Permalink: http://link.aip.org/link/?JAPIAU/106/084102/1
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KEYWORDS and PACS

Keywords
PACS
  • 77.80.Dj
    Ferroelectric domain structure; hysteresis
  • 77.22.Ej
    Dielectric polarization and depolarization
  • 77.80.Bh
    Ferroelectric phase transitions and Curie point
  • YEAR: 2009

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PUBLICATION DATA

ISSN:
0021-8979 (print)   1089-7550 (online)
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REFERENCES (21)
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