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Chin. Phys. B, 2014, Vol. 23(3): 036801    DOI: 10.1088/1674-1056/23/3/036801

Structural and physical properties of BiFeO3 thin films epitaxially grown on SrTiO3 (001) and polar (111) surfaces

He Shu-Min (贺树敏), Liu Guo-Lei (刘国磊), Zhu Da-Peng (朱大鹏), Kang Shi-Shou (康仕寿), Chen Yan-Xue (陈延学), Yan Shi-Shen (颜世申), Mei Liang-Mo (梅良模)
School of Physics & State key Laboratory of Crystal Materials, Shandong University, Jinan 250100, China
Abstract  The influence of surface polarity on the structural properties of BiFeO3 (BFO) thin films is investigated. BFO thin films are epitaxially grown on SrTiO3 (STO) (100) and polar (111) surfaces by oxygen plasma-assisted molecular beam epitaxy. It is shown that the crystal structure, surface morphology, and defect states of BFO films grown on STO substrates with nonpolar (001) or polar (111) surfaces perform very differently. BFO/STO (001) is a fully strained tetragonal phase with orientation relationship (001)[100]BFO‖(001)[100]STO, while BFO/STO (111) is a rhombohedral phase. BFO/STO (111) has rougher surface morphology and less defect states, which results in reduced leakage current and lower dielectric loss. Moreover, BFO films on both STO (001) and STO (111) are direct band oxides with similar band gaps of 2.65 eV and 2.67 eV, respectively.
Keywords:  multiferroics      BiFeO3      polar surface      epitaxial growth  
Received:  03 May 2013      Revised:  30 August 2013      Accepted manuscript online: 
PACS:  68.47.Gh (Oxide surfaces)  
  77.55.Nv (Multiferroic/magnetoelectric films)  
  77.55.Px (Epitaxial and superlattice films)  
Fund: Project supported by the National Basic Research Program of China (Grant Nos. 2009CB929202 and 2013CB922303), the National Natural Science Foundation of China (Grant Nos. 51231007 and 11374189), the Funding from Shandong University, China (Grant No. 2011JC006), and the Electronics Technology Group Corporation of China (Grant No. CJ20130304).
Corresponding Authors:  Liu Guo-Lei     E-mail:

Cite this article: 

He Shu-Min (贺树敏), Liu Guo-Lei (刘国磊), Zhu Da-Peng (朱大鹏), Kang Shi-Shou (康仕寿), Chen Yan-Xue (陈延学), Yan Shi-Shen (颜世申), Mei Liang-Mo (梅良模) Structural and physical properties of BiFeO3 thin films epitaxially grown on SrTiO3 (001) and polar (111) surfaces 2014 Chin. Phys. B 23 036801

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