標題: Atomic-Scale Visualization of Polarization Pinning and Relaxation at Coherent BiFeO3/LaAlO3 Interfaces
作者: Huang, Rong
Ding, Hang-Chen
Liang, Wen-I
Gao, Yong-Chao
Tang, Xiao-Dong
He, Qing
Duan, Chun-Gang
Zhu, Ziqiang
Chu, Junhao
Fisher, Craig A. J.
Hirayama, Tsukasa
Ikuhara, Yuichi
Chu, Ying-Hao
材料科學與工程學系
Department of Materials Science and Engineering
關鍵字: bismuth ferrite;annular bright-field imaging;heterointerfaces
公開日期: 1-Feb-2014
摘要: Complex oxide heterointerfaces, which play host to an incredible variety of interface physical phenomena, are of great current interest in introducing new functionalities to systems. Here, coherent super-tetragonal BiFeO3/LaAlO3 and rhombohedral BiFeO3/LaAlO3 heterointerfaces are investigated by using a combination of high-angle annular dark-field (HAADF) imaging and annular bright-field (ABF) imaging in a spherical aberration (Cs) corrected scanning transmission electron microscope (STEM), and first-principles calculations. The complicated ferroelectric polarization pinning and relaxation that occurs at both interfaces is revealed with atomic resolution, with a dramatic change in structure of BiFeO3, from cubic to super-tetragonal-like. The results enable a detailed explanation to be given of how non-bulk phase structures are stabilized in thin films of this material.
URI: http://dx.doi.org/10.1002/adfm.201301470
http://hdl.handle.net/11536/24044
ISSN: 1616-301X
DOI: 10.1002/adfm.201301470
期刊: ADVANCED FUNCTIONAL MATERIALS
Volume: 24
Issue: 6
起始頁: 793
結束頁: 799
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