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Polarization coupling in ferroelectric multilayers

机译：铁电多层体中的极化耦合

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摘要

A thermodynamic model was developed to understand the role of charge compensation at the interlayer interfaces in compositionally graded monodomain ferroelectric multilayers. The polarization mismatch between the ferroelectric layers generates depoling fields with the polarization in each layer varying from its bulk uncoupled value as to adapt to the electrical boundary conditions. By treating the strength of the electrostatic field as a phenomenological parameter, it is shown that if there are localized charges to compensate for the polarization mismatch and relax the depolarization fields, ferroelectric layers behave independently of each other and exhibit a dielectric response that can be described as the sum of their corresponding intrinsic uncoupled dielectric properties. For perfectly insulating heterostructures with no localized charges, the depolarization field is minimized by lowering the polarization difference between layers, yielding a ferroelectric multilayer that behaves as if it were a single ferroelectric material. There exists an optimum value of coupling strength at which average polarization of the multilayer is maximized. Furthermore, ferroelectric multilayers may display a colossal dielectric response dependant upon the interlayer electrostatic interactions.
机译：建立了一个热力学模型，以了解电荷梯度在组成梯度单畴铁电多层膜中层间界面的作用。铁电层之间的极化失配会产生极化场，其中每一层的极化都与其整体解耦值不同，以适应电边界条件。通过将静电场的强度视为现象学参数，表明如果存在局部电荷以补偿极化失配并缓和去极化场，则铁电层的行为彼此独立，并表现出介电响应，可以描述为是它们对应的固有非耦合介电特性的总和。对于没有局部电荷的完全绝缘的异质结构，可通过降低各层之间的极化差异来最小化去极化场，从而产生铁电多层，其行为就像是一种铁电材料。存在耦合强度的最佳值，在该最优值处，多层的平均极化被最大化。此外，铁电多层可以显示出取决于层间静电相互作用的巨大介电响应。

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  • 来源
    《Physical review》 |2009年第17期|174113.1-174113.11|共11页
  • 作者

    M. B. Okatan; J. V. Mantese; S. P. Alpay;

  • 作者单位

    Department of Chemical, Materials, and Biomolecular Engineering, Materials Science and Engineering Program, University of Connecticut, Storrs, Connecticut 06269, USA;

    United Technologies Research Center, East Hartford, Connecticut 06108, USA;

    Department of Chemical, Materials, and Biomolecular Engineering, Materials Science and Engineering Program, University of Connecticut, Storrs, Connecticut 06269, USA Department of Physics, University of Connecticut, Storrs, Connecticut 06269, USA;

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  • 正文语种 eng
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  • 关键词

    phase transitions and curie point; polarization and depolarization;

    机译：相变和居里点;极化和去极化;

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