期刊
PHYSICA B-CONDENSED MATTER
卷 407, 期 17, 页码 3377-3381出版社
ELSEVIER
DOI: 10.1016/j.physb.2012.04.041
关键词
Flexoelectricity; Critical thickness; Ferroelectric thin films; Misfit strain; Phenomenology
资金
- National Natural Science Foundation of China [11090330, 11090331, 11072003]
- National Basic Research Program of China [G2010CB832701]
Flexoelectricity describes the coupling between polarization and strain/stress gradients in insulating crystals. In this paper, using the Landau-Ginsburg-Devonshire phenomenological approach, we found that flexoelectricity could increase the theoretical critical thickness in epitaxial BaTiO3 thin films, below which the switchable spontaneous polarization vanishes. This increase is remarkable in tensile films while trivial in compressive films due to the electrostriction caused decrease of potential barrier, which can be easily destroyed by the flexoelectricity, between the ferroelectric state and the paraelectric state in tensile films. In addition, the films are still in a uni-polar state even below the critical thickness due to the flexoelectric effect. (C) Elsevier B.V. All rights reserved.
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