铁性氧化物界面应变耦合诱导极化拓扑结构

铁性氧化物界面应变耦合诱导极化拓扑结构

唐云龙，王宇佳，朱银莲^*，马秀良

（1.  中国科学院金属研究所沈阳材料科学国家研究中心，辽宁沈阳110016；2. 松山湖材料实验室大湾区显微科学与技术研究中心，广东东莞523808）

摘  要  结合像差校正透射电子显微术和精密脉冲激光沉积，本文探索研究了生长在GdScO₃衬底上的多层铁电PbTiO₃/SrTiO₃薄膜中应变调控诱导的90º铁弹畴组态。衍衬分析表明薄膜中存在“鱼骨”状90º畴组态。像差校正HAADF-STEM成像研究发现这些特殊90º畴通过中间超薄全共格SrTiO₃层传递弹性应变耦合，在中间SrTiO₃层和邻近PbTiO₃层中形成巨大的长程非均匀周期性弹性应变分布，从而在相邻PbTiO₃层中诱导形成了极化涡旋畴和极化涡旋-反涡旋对极化拓扑结构。

关键词  涡旋-反涡旋极化；90º畴；像差校正电子显微学；PbTiO₃薄膜

中图分类号：TB383；O77；TG115. 21⁺ 5. 3 

文献标识码：A  doi:10.3969/j.issn.1000-6281.2022.0５.00７

Strain mediated topological polarization structures in ferroic films with coherent interface

TANG Yun-long¹，WANG Yu-Jia ¹，ZHU Yin-lian^1，2*，MA Xiu-liang ¹

(1. Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang Liaoning 110016；2. Bay Area Center for Electron Microscopy, Songshan Lake Materials Laboratory, Dongguan Guangdong 523808，China)

Abstract   By a combination of aberration-corrected scanning transmission electron microscopy and pulsed laser deposition, strain mediated 90° domains in PbTiO₃/SrTiO₃ multilayer films grown on GdScO₃ substrates were studied. Diffraction contrast analysis suggests that special 90° domain configurations formed in the tensile strained PbTiO₃/SrTiO₃ multilayer films. By quantitatively mapping the internal strain and off-centre cation displacements, a fully coherent PbTiO₃/SrTiO₃ multilayer structure was confirmed here. In particular, vortex and vortex-antivortex polar topologies were identified, accompanied with unusual disclination strains across the whole PbTiO₃/SrTiO₃ multilayer structure, which exhibits periodic, long-range elastic strain distributions.

Keywords  vortex-antivortex；90° domain；aberration-corrected scanning transmission electron microscopy；PbTiO₃ film

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