期刊
NATURE COMMUNICATIONS
卷 8, 期 -, 页码 -出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/ncomms15549
关键词
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资金
- National Basic Research Program of China [2016YFA0300804, 2016YFA0300903]
- National Natural Science Foundation of China [51672007, 51502007, 51502032, 51522201]
- National Program for Thousand Young Talents of China
- Peking-Tsinghua-IOP Collaborative Innovation Centre for Quantum Matter
- Ministry of Science and Technology, R.O.C. [MOST 103-2119-M-009-003-MY3]
- Centre for Interdisciplinary Science of National Chiao Tung University
- Japan Society for the Promotion of Science (JSPS) [25106003]
- Nanotechnology Platform'' - MEXT, Japan [12024046]
- Grants-in-Aid for Scientific Research [17H06094, 17K18974, 17H01316, 25106003, 15K18202] Funding Source: KAKEN
Although the size effect in ferroelectric thin films has been known for long time, the underlying mechanism is not yet fully understood and whether or not there is a critical thickness below which the ferroelectricity vanishes is still under debate. Here, we directly measure the thickness-dependent polarization in ultrathin PbZr0.2Ti0.8O3 films via quantitative annular bright field imaging. We find that the polarization is significantly suppressed for films <10-unit cells thick (similar to 4 nm). However, approximately the polarization never vanishes. The residual polarization is similar to 16 mu Ccm(-2) (similar to 17%) at 1.5-unit cells (similar to 0.6 nm) thick film on bare SrTiO3 and similar to 22 mu Ccm(-2) at 2-unit cells thick film on SrTiO3 with SrRuO3 electrode. The residual polarization in these ultrathin films is mainly attributed to the robust covalent Pb-O bond. Our atomic study provides new insights into mechanistic understanding of nanoscale ferroelectricity and the size effects.
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