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首页> 外文期刊>Physical review. B, Condensed Matter And Materials Physics >Influence of depolarization field on polarization states in epitaxial ferroelectric thin films with nonequally biaxial misfit strains
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Influence of depolarization field on polarization states in epitaxial ferroelectric thin films with nonequally biaxial misfit strains

机译：去极化场对具有非等双轴失配应变的外延铁电薄膜极化状态的影响

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摘要

Depolarization field and misfit strain are two important factors that greatly influence the properties of ferroelectric thin films. The present work studies the effect of depolarization field on polarization states in a single-domain ferroelectric thin film with nonequally biaxial in-plane misfit strains. Three coupled Euler-Lagrange equations are derived from the minimization of the total free energy and solved numerically. Misfit-strain-misfit-strain phase diagrams are constructed to represent the polarization states. Under the short-circuit boundary condition, the depolarization field shifts the phase boundaries in the phase diagrams, leading to the contraction and expansion of the regions of out-of-plane and in-plane phases, respectively. Under the open-circuit boundary condition, there exists an out-of-plane electretlike state under high compressive misfit strains when a surface polarization P_m is included.
机译：去极化场和失配应变是极大地影响铁电薄膜性能的两个重要因素。本工作研究了去极化场对具有非等双轴面内失配应变的单畴铁电薄膜中极化状态的影响。从总自由能的最小化中导出了三个耦合的Euler-Lagrange方程，并对其进行了数值求解。失配应变失配应变相位图用于表示极化状态。在短路边界条件下，去极化场会移动相图中的相界，从而分别导致平面外和平面内相位区域的收缩和扩展。在开路边界条件下，当包括表面极化P_m时，在高压缩失配应变下存在平面外的驻极体状态。

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