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Title: Uniaxial strain-induced ferroelectric phase with a giant axial ratio in a (110) BiFeO3 thin film
Authors: Liu, H.
Yang, P. 
Fan, Z.
Kumar, A.
Yao, K.
Ong, K.P.
Zeng, K. 
Wang, J. 
Issue Date: 6-Jun-2013
Citation: Liu, H., Yang, P., Fan, Z., Kumar, A., Yao, K., Ong, K.P., Zeng, K., Wang, J. (2013-06-06). Uniaxial strain-induced ferroelectric phase with a giant axial ratio in a (110) BiFeO3 thin film. Physical Review B - Condensed Matter and Materials Physics 87 (22) : -. ScholarBank@NUS Repository.
Abstract: Strain engineering, which employs biaxial misfit strain to deform the crystal structure, is a powerful tool to tune the physical behavior of epitaxial thin films. Here we show that a 10-nm-thick BiFeO3 film is uniaxially strained by (110)-oriented LaAlO3 substrate, which exhibits a monoclinic lattice with a giant c/a ∼ 1.24 and a unique stripe ferroelectric domain configuration, as revealed by high resolution synchrotron x-ray diffraction and piezoelectric force microscopy. A strain-phase diagram for BiFeO3 under uniaxial strain condition is predicted by first-principles calculations, suggesting that monoclinic Pm phase with a large polarization of ∼130 μC/cm2 is the lowest-in-energy phase when strained by (110)-oriented LaAlO3 substrate. Our results provide a potential route to tune physical behavior of epitaxial ferroelectric thin films by uniaxial strain in (110) orientation, instead of widely investigated biaxial strain in (001) orientation. © 2013 American Physical Society.
Source Title: Physical Review B - Condensed Matter and Materials Physics
ISSN: 10980121
DOI: 10.1103/PhysRevB.87.220101
Appears in Collections:Staff Publications

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