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首页> 外文期刊>Nanoscale >Domain alignment within ferroelectric/dielectric PbTiO3/SrTiO3 superlattice nanostructures
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Domain alignment within ferroelectric/dielectric PbTiO3/SrTiO3 superlattice nanostructures

机译：铁电/电介质内域对齐的钛酸铅/ SrTiO3超晶格纳米结构

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摘要

The ferroelectric domain pattern within lithographically defined PbTiO3/SrTiO3 ferroelectric/dielectric heteroepitaxial superlattice nanostructures is strongly influenced by the edges of the structures. Synchrotron X-ray nanobeam diffraction reveals that the spontaneously formed 180 degrees ferroelectric stripe domains exhibited by such superlattices adopt a configuration in rectangular nanostructures in which domain walls are aligned with long patterned edges. The angular distribution of X-ray diffuse scattering intensity from nanodomains indicates that domains are aligned within an angular range of approximately 20 degrees with respect to the edges. Computational studies based on a time-dependent Landau-Ginzburg-Devonshire model show that the preferred direction of the alignment results from lowering of the bulk and electrostrictive contributions to the free energy of the system due to the release of the lateral mechanical constraint. This unexpected alignment appears to be intrinsic and not a result of distortions or defects caused by the patterning process. Our work demonstrates how nanostructuring and patterning of heteroepitaxial super-lattices allow for pathways to create and control ferroelectric structures that may appear counterintuitive.
机译：铁电域模式内光刻的钛酸铅/ SrTiO3定义铁电/电介质异质外延超晶格纳米结构强烈影响的边缘结构。同步加速器x射线nanobeam衍射显示的自发形成180度铁电域条纹的展出超晶格采用的配置矩形纳米结构域壁与长有图案的边缘。x射线漫散射角分布强度从nanodomains表明域一个角范围内是一致的吗大约20度的边缘。时间Landau-Ginzburg-Devonshire模型显示的优先方向从降低体积和对齐结果电致伸缩贡献自由能系统由于外侧的释放机械约束。似乎是内在的而不是一个结果扭曲或缺陷造成的模式的过程。纳米结构和异质外延的模式super-lattices允许创建和途径控制铁电结构可能出现违反直觉。

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