The Evidence of Giant Surface Flexoelectric Field in (111) Oriented BiFeO3 Thin Film

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	The Evidence of Giant Surface Flexoelectric Field in (111) Oriented BiFeO3 Thin Film
	Li, Xiaolong; Yang, Tieying; Zhang, Xingmin; Chen, Bin; Guo, Haizhong; Jin, Kuijuan; Wu, Xiaoshan; Gao, Xingyu; Li, Zhong; Wang, Can
刊名	ACS APPLIED MATERIALS & INTERFACES
	2017
卷号	9 期号:6 页码:5600-5606
ISSN号	1944-8244
英文摘要	In this work, the surface structure of a single-domain epitaxial BiFeO3 film with (111) orientation was investigated by in situ grazing incidence X-ray diffraction and X-ray reflectivity. We found that a large strain gradient exists in the surface region (2-3 nm) of the BiFeO3 film. The strain gradient is approximately 10(7) m(-1), which is 2 or 3 orders of magnitude larger than the value inside the film. Moreover, we found that a surface layer with a lower electron density compared with the underlying BiFeO3 layer exists on the surface of BiFeO3 film, and this layer exhibits an irreversible surface structure transition occurs at 500 K, which should be associated with the surface flexoelectric field. We considered that this large strain gradient is originated from the surface depolarization field of ferroelectrics. Our results suggest a coupling between the surface structure and the flexoelectricity and imply that the surface layer and properties would be controlled by the strain gradient in ferroelectric films.
公开日期	2017-12-25
内容类型	期刊论文
源URL	[http://ir.nimte.ac.cn/handle/174433/13984]
专题	2017专题
推荐引用方式 GB/T 7714	Li, Xiaolong,Yang, Tieying,Zhang, Xingmin,et al. The Evidence of Giant Surface Flexoelectric Field in (111) Oriented BiFeO3 Thin Film[J]. ACS APPLIED MATERIALS & INTERFACES,2017,9(6):5600-5606.
APA	Li, Xiaolong.,Yang, Tieying.,Zhang, Xingmin.,Chen, Bin.,Guo, Haizhong.,...&Wang, Can.(2017).The Evidence of Giant Surface Flexoelectric Field in (111) Oriented BiFeO3 Thin Film.ACS APPLIED MATERIALS & INTERFACES,9(6),5600-5606.
MLA	Li, Xiaolong,et al."The Evidence of Giant Surface Flexoelectric Field in (111) Oriented BiFeO3 Thin Film".ACS APPLIED MATERIALS & INTERFACES 9.6(2017):5600-5606.