1. Possible absence of critical thickness and size effect in ultrathin perovskite ferroelectric films
- Author
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Lei Liao, Naoya Shibata, Dapeng Yu, Bin Feng, Mingqiang Li, Zhangyuan Zhang, Heng Jui Liu, Ryo Ishikawa, Shulin Chen, Yuichi Ikuhara, Wang Enge, Jingmin Zhang, Yen Lin Huang, Ying-Hao Chu, Kaihui Liu, Xiumei Ma, and Peng Gao
- Subjects
Multidisciplinary ,Materials science ,Condensed matter physics ,Science ,General Physics and Astronomy ,Nanotechnology ,02 engineering and technology ,General Chemistry ,021001 nanoscience & nanotechnology ,Polarization (waves) ,01 natural sciences ,Ferroelectricity ,Article ,General Biochemistry, Genetics and Molecular Biology ,High resolution electron microscopy ,Covalent bond ,0103 physical sciences ,Electrode ,Residual polarization ,010306 general physics ,0210 nano-technology ,Nanoscopic scale ,Critical thickness - Abstract
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, Understanding ferroelectricity at reduced dimensions will be important for future sub-nanoscale devices based on ferroelectrics. Using high resolution electron microscopy; Gao et al., observe the existence of a measurable polarization at a thickness of just 1.5-unit cells
- Published
- 2017