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Observation of oxygen pyramid tilting induced polarization rotation in strained BiFeO 3 thin film
Author(s) -
Song Dongsheng,
Liu HengJui,
Kovács András,
DuninBorkowski Rafal E.,
Chu YingHao,
Zhu Jing
Publication year - 2020
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.16937
Subject(s) - materials science , ferroelectricity , tetragonal crystal system , polarization (electrochemistry) , condensed matter physics , thin film , oxygen , perovskite (structure) , transmission electron microscopy , monoclinic crystal system , crystallography , nanotechnology , optoelectronics , chemistry , dielectric , crystal structure , physics , organic chemistry
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 BiFeO 3 /LaAlO 3 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.