標題: Observation of oxygen pyramid tilting induced polarization rotation in strained BiFeO3 thin film
作者: Song, Dongsheng
Liu, Heng-Jui
Kovacs, Andras
Dunin-Borkowski, Rafal E.
Chu, Ying-Hao
Zhu, Jing
材料科學與工程學系
Department of Materials Science and Engineering
關鍵字: ferroelectricity;ferroelectric materials;multiferroics;perovskites;polarization;thin films
公開日期: 1-Jan-1970
摘要: Oxygen octahedral tilting has been recognized to strongly interact with spin, charge, orbital, and lattice degrees of freedom in perovskite oxides. Here, we observe a strain-driven stripe-like morphology of two supertetragonal (monoclinic Cc and Cm) phases in the strained BiFeO3/LaAlO3 thin films. The two supertetragonal phases have a similar giant axial ratio but differences in oxygen pyramid tilting mode. Especially, the competition between polar instability and oxygen pyramid tilting is identified using atomically resolved scanning transmission electron microscopy, leading to the polarization rotation across the phase boundary. In addition, microtwins are observed in the Cc phase. Our findings provide new insights of the coupling between ferroelectric polarization and oxygen pyramid tilting in oxide thin films and will help to design novel phase morphology with desirable ferroelectric polarization and properties for new applications in perovskite oxides.
URI: http://dx.doi.org/10.1111/jace.16937
http://hdl.handle.net/11536/153376
ISSN: 0002-7820
DOI: 10.1111/jace.16937
期刊: JOURNAL OF THE AMERICAN CERAMIC SOCIETY
起始頁: 0
結束頁: 0
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