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-lian1,2*,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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