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首页> 外文期刊>IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control >Interlayer coupling in ferroelectric bilayer and superlattice heterostructures
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Interlayer coupling in ferroelectric bilayer and superlattice heterostructures

机译：铁电双层和超晶格异质结构中的层间耦合

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摘要

Ferroelectric multilayers and superlattices have gained interest for dynamic random access memory (DRAM) applications and as active elements in tunable microwave devices in the telecommunications industry. A number of experimental studies have shown that these materials have many peculiar properties which cannot be described by a simple series connection of the individual layers that make up the heterostructures. A thermodynamic analysis is presented to demonstrate that ferroelectric multilayers interact through internal elastic, electrical, and electromechanical fields and the strength of the coupling can be quantitatively described using Landau theory of phase transformations, theory of elasticity, and principles of electrostatics. The theoretical analysis shows that compositional variations across ferroelectric bilayers result in a broken spatial inversion symmetry that can lead to asymmetric thermodynamic potentials favoring one ferroelectric ground state over the other. Furthermore, the thermodynamic modeling indicates that there is a strong electrostatic coupling between the layers that leads to the suppression of ferroelectricity at a critical paraelectric layer thickness for ferroelectric-paraelectric bilayers. This bilayer is expected to have a gigantic dielectric response similar to the dielectric anomaly near Curie-Weiss temperature in homogeneous ferroelectrics at this critical thickness
机译：铁电多层和超晶格已引起人们对动态随机存取存储器（DRAM）应用的关注，并已成为电信行业可调谐微波设备中的有源元件。大量的实验研究表明，这些材料具有许多独特的性能，无法通过构成异质结构的各个层的简单串联来描述。进行了热力学分析，以证明铁电多层体通过内部弹性场，电场和机电场相互作用，并且可以使用Landau相变理论，弹性理论和静电原理来定量描述耦合强度。理论分析表明，跨铁电双层的成分变化会导致破坏的空间反转对称性，从而导致不对称的热力学势，从而有利于一种铁电基态。此外，热力学模型表明层之间存在强的静电耦合，从而在铁电-顺电双层的临界顺电层厚度下抑制了铁电。在此临界厚度下，该双层有望具有类似于居里-魏斯温度附近均质铁电体中电介质异常的巨大电介质响应。

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