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

doi:10.1088/1674-1056/23/3/036801

中国物理B ›› 2014, Vol. 23 ›› Issue (3): 36801-036801.doi: 10.1088/1674-1056/23/3/036801

• CONDENSED MATTER: STRUCTURAL, MECHANICAL, AND THERMAL PROPERTIES • 上一篇下一篇

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

贺树敏, 刘国磊, 朱大鹏, 康仕寿, 陈延学, 颜世申, 梅良模

School of Physics & State key Laboratory of Crystal Materials, Shandong University, Jinan 250100, China

收稿日期:2013-05-03 修回日期:2013-08-30 出版日期:2014-03-15 发布日期:2014-03-15
基金资助:
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).

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

Received:2013-05-03 Revised:2013-08-30 Online:2014-03-15 Published:2014-03-15
Contact: Liu Guo-Lei E-mail:liu-guolei@sdu.edu.cn
Supported by:
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).

摘要/Abstract

摘要： 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.

关键词: multiferroics, BiFeO₃, polar surface, epitaxial growth

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.

Key words: multiferroics, BiFeO₃, polar surface, epitaxial growth

中图分类号: (Oxide surfaces)

68.47.Gh

77.55.Nv (Multiferroic/magnetoelectric films) 77.55.Px (Epitaxial and superlattice films)

贺树敏, 刘国磊, 朱大鹏, 康仕寿, 陈延学, 颜世申, 梅良模. Structural and physical properties of BiFeO₃ thin films epitaxially grown on SrTiO₃ (001) and polar (111) surfaces[J]. 中国物理B, 2014, 23(3): 36801-036801.

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[J]. Chin. Phys. B, 2014, 23(3): 36801-036801.

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

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

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