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首页> 外文期刊>Surface review and letters >POLARIZATION PROPERTIES OF FERROELECTRIC THIN FILMS UNDER DIFFERENT BOUNDARY CONDITIONS
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POLARIZATION PROPERTIES OF FERROELECTRIC THIN FILMS UNDER DIFFERENT BOUNDARY CONDITIONS

机译：不同边界条件下铁电薄膜的极化特性

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摘要

By taking into account two types of boundary conditions (BC), free boundary condition (FBC) and zero boundary condition (ZBC), an improved transverse Ising model with the consideration of surface transition layers (STL) is used to describe the polarization properties of ferroelectric thin films in the framework of the mean field approximation. Functions representing the intra-layer and inter-layer couplings are introduced to characterize the BC and STL, which reflect the structure variation of film surface. Comparing the results obtained by employing FBC and ZBC, some effects of BC are derived in the model, which demonstrated that the BC play important roles on the properties of ferroelectric thin films. It is shown that the effect of ZBC can extend to deeper film than that of FBC. When different BC are adopted, competition between the fields (depolarization field and transverse field) and BC induces some different and interesting phenomena. Some theoretical results in this paper are found to be in reasonable accordance with experimental data and have some application importance.
机译：考虑到两种边界条件（BC），自由边界条件（FBC）和零边界条件（ZBC），使用考虑了表面过渡层（STL）的改进的横向伊辛模型来描述偏振态。铁电薄膜在框架内的平均场近似。引入代表层内和层间耦合的函数来表征BC和STL，它们反映了薄膜表面的结构变化。比较通过FBC和ZBC获得的结果，在模型中得出了BC的一些效果，这表明BC对铁电薄膜的性能起着重要作用。结果表明，ZBC的作用比FBC的作用更深。当采用不同的BC时，场（去极化场和横向场）与BC之间的竞争会引起一些不同而有趣的现象。发现本文的一些理论结果与实验数据相吻合，并具有一定的应用重要性。

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