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首页> 外文期刊>Journal of Applied Physics >Substrate influence on the shape of domains in epitaxial PbTiO_3 thin films
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Substrate influence on the shape of domains in epitaxial PbTiO_3 thin films

机译：衬底对外延PbTiO_3薄膜域结构的影响

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摘要

Epitaxial PbTiO_3 thin films were grown on SrTiO_3(001) and DyScO_3(110) substrates by pulsed laser deposition. We used high-resolution transmission electron microscopy to investigate the 90° domain structure in the films. They were found to have a predominant fraction of c domains along with a certain minor volume fraction of a domains that is clearly higher in case of the DyScO_3 substrates. In PbTiO_3 on SrTiO_3 the a domains were found to have a wedge shape, whereas in PbTiO_3 on SrRuO_3/DyScO_3 they have a nearly uniform width. The presence of steps in the domain walls has been observed in the films on both substrates, but the steps are clearly more dominant in the case of SrTiO_3 than of SrRuO_3/DyScO_3 and are responsible for the observed wedge shape. The observed difference in the films induced by the two substrates is attributed to a higher stiffness of SrTiO_3 than of SrRuO_3/DyScO_3 as we corroborated with nanoindentation experiments.
机译：通过脉冲激光沉积在SrTiO_3（001）和DyScO_3（110）衬底上生长外延PbTiO_3薄膜。我们使用高分辨率透射电子显微镜研究了薄膜中的90°域结构。发现它们具有主要的c结构域部分和某些较小的结构域体积分数，在DyScO_3底物的情况下明显更高。在SrTiO_3上的PbTiO_3中，发现a域呈楔形，而在SrRuO_3 / DyScO_3上的PbTiO_3中，它们的宽度几乎均匀。在两个基板上的膜中都观察到了畴壁中台阶的存在，但是在SrTiO_3的情况下，台阶明显比SrRuO_3 / DyScO_3的台阶更占优势，并且是观察到的楔形的原因。正如我们通过纳米压痕实验所证实的，观察到的由两种基材诱导的薄膜差异归因于SrTiO_3的刚度高于SrRuO_3 / DyScO_3的刚度。

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