| Structural and physical properties of BiFeO3 thin films epitaxially grown on SrTiO3（001） and polar（111） surfaces |
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| 引用本文： | 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(3):451-456. |
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| 作者姓名： | 贺树敏 刘国磊 朱大鹏 康仕寿 陈延学 颜世申 梅良模 |
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| 作者单位： | School of Physics ＆ State key Laboratory of Crystal Materials, Shandong University, Jinan 250100, China |
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| 基金项目： | 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);the Electronics Technology Group Corporation of China(Grant No.CJ20130304) |
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| 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]BFOII（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.
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| 关 键 词： | BiFeO3薄膜 SrTiO3 表面极性 外延生长 结构特性 物理性质 等离子体辅助分子束外延 STO |
Structural and physical properties of BiFeO_3 thin films epitaxially grown on SrTiO_3(001) and polar(111) surfaces |
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| Abstract: | multiferroics, BiFeO3, polar surface, epitaxial growth |
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| Keywords: | multiferroics BiFeO polar surface epitaxial growth |
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