期刊
APPLIED PHYSICS LETTERS
卷 80, 期 15, 页码 2740-2742出版社
AMER INST PHYSICS
DOI: 10.1063/1.1470247
关键词
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The experimentally measured coercive electric fields for domain reversal in ferroelectrics are typically many orders of magnitude lower than the estimates from phenomenological free-energy theory. This letter specifically investigates the influence of polarization gradients at pre-existing 180degrees domain walls in ferroelectrics on coercive fields for domain wall motion. It is shown that the ratio of theoretical coercive field without and with a preexisting domain wall is directly proportional to the ratio x(o)/a, where a is the lattice parameter and 2x(o) is the polarization wall width. This factor is 7.5-45 for a 20-120 nm wall width, the latter width determined here as the experimental upper limit for polarization wall width in lithium tantalate. (C) 2002 American Institute of Physics.
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