期刊
APPLIED PHYSICS LETTERS
卷 95, 期 1, 页码 -出版社
AMER INST PHYSICS
DOI: 10.1063/1.3171936
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资金
- Beijing Municipal Education Commission [20080739027]
- National Natural Science Foundation of China [10842002]
The distribution of polarization in low-dimensional ferroelectric nanostructures appears to form vertex structures under open-circuit boundary conditions. A thermodynamics-based continuum phase field approach is employed to investigate the conditions for existence of single-vertex structure in two-dimensional (2D) square-shaped nanodots. It has been observed that, for a given material, such structure exists only in a certain range in dimension, which is associated to an exchange energy parameter in the model. It has been further noticed that, instead of a double-vertex structure, a single-vertex distribution remains in a 2D rectangular-shaped nanodot with initial conditions of polarization in favor of single-toroid shape. (C) 2009 American Institute of Physics. [DOI: 10.1063/1.3171936]
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