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Local Enhancement of Polarization at PbTiO3/BiFeO3 Interfaces Mediated by Charge Transfer
Liu, Ying; Zhu, Yin-Lian; Tang, Yun-Long; Wang, Yu-Jia; Jiang, Yi-Xiao; Xu, Yao-Bin; Zhang, Bin; Ma, Xiu-Liang; Zhu, YL; Ma, XL (reprint author), Chinese Acad Sci, Shenyang Natl Lab Mat Sci, Inst Met Res, Wenhua Rd 72, Shenyang 110016, Peoples R China.; Ma, XL (reprint author), Lanzhou Univ Technol, Sch Mat Sci & Engn, Langongping Rd 287, Lanzhou 730050, Peoples R China.
2017-06-01
Source PublicationNANO LETTERS
ISSN1530-6984
Volume17Issue:6Pages:3619-3628
AbstractFerroelectrics hold promise for sensors, transducers, and telecommunications. With the demand of electronic devices scaling down, they take the form of nanoscale films. However, the polarizations in ultrathin ferroelectric films are usually reduced dramatically due to the depolarization field caused by incomplete charge screening at interfaces, hampering the integrations of ferroelectrics into electric devices. Here, we design and fabricate a ferroelectric/multiferroic PbTiO3/BiFeO3 system, which exhibits discontinuities in both chemical valence and ferroelectric polarization across the interface. Aberration-corrected scanning transmission electron microscopic study reveals an 8% elongation of out-of-plane lattice spacing associated with 104%, 107%, and 39% increments of delta(Ti), delta(O1), and delta(O2) in the PbTiO3 layer near the head-to-tail polarized interface, suggesting an over similar to 70% enhancement of polarization compared with that of bulk PbTiO3. Besides that in PbTiO3, polarization in the BiFeO3 is also remarkably enhanced. Electron energy loss spectrum and X-ray photoelectron spectroscopy investigations demonstrate the oxygen vacancy accumulation as well as the transfer of Fe3+ to Fe2+ at the interface. On the basis of the polar catastrophe model, FeO2/PbO interface is determined. First-principles calculation manifests that the oxygen vacancy at the interface plays a predominate role in inducing the local polarization enhancement. We propose a charge transfer mechanism that leads to the remarkable polarization increment at the PbTiO3/BiFeO3 interface. This study may facilitate the development of nanoscale ferroelectric devices by tailing the coupling of charge and lattice in oxide heteroepitaxy.; Ferroelectrics hold promise for sensors, transducers, and telecommunications. With the demand of electronic devices scaling down, they take the form of nanoscale films. However, the polarizations in ultrathin ferroelectric films are usually reduced dramatically due to the depolarization field caused by incomplete charge screening at interfaces, hampering the integrations of ferroelectrics into electric devices. Here, we design and fabricate a ferroelectric/multiferroic PbTiO3/BiFeO3 system, which exhibits discontinuities in both chemical valence and ferroelectric polarization across the interface. Aberration-corrected scanning transmission electron microscopic study reveals an 8% elongation of out-of-plane lattice spacing associated with 104%, 107%, and 39% increments of delta(Ti), delta(O1), and delta(O2) in the PbTiO3 layer near the head-to-tail polarized interface, suggesting an over similar to 70% enhancement of polarization compared with that of bulk PbTiO3. Besides that in PbTiO3, polarization in the BiFeO3 is also remarkably enhanced. Electron energy loss spectrum and X-ray photoelectron spectroscopy investigations demonstrate the oxygen vacancy accumulation as well as the transfer of Fe3+ to Fe2+ at the interface. On the basis of the polar catastrophe model, FeO2/PbO interface is determined. First-principles calculation manifests that the oxygen vacancy at the interface plays a predominate role in inducing the local polarization enhancement. We propose a charge transfer mechanism that leads to the remarkable polarization increment at the PbTiO3/BiFeO3 interface. This study may facilitate the development of nanoscale ferroelectric devices by tailing the coupling of charge and lattice in oxide heteroepitaxy.
description.department[liu, ying ; zhu, yin-lian ; tang, yun-long ; wang, yu-jia ; jiang, yi-xiao ; xu, yao-bin ; ma, xiu-liang] chinese acad sci, shenyang natl lab mat sci, inst met res, wenhua rd 72, shenyang 110016, peoples r china ; [zhang, bin] chinese acad sci, inst met res, anal & testing dept, wenhua rd 72, shenyang 110016, peoples r china ; [ma, xiu-liang] lanzhou univ technol, sch mat sci & engn, langongping rd 287, lanzhou 730050, peoples r china
KeywordPerovskite Oxide Ferroelectric Interface Polarization Enhancement Aberration Corrected Scanning Transmission Electron Microscope
Subject AreaChemistry, Multidisciplinary ; Chemistry, Physical ; Nanoscience & Nanotechnology ; Materials Science, Multidisciplinary ; Physics, Applied ; Physics, Condensed Matter
Funding OrganizationNational Natural Science Foundation of China [51231007, 51571197, 51501194, 51671194, 51401212]; National Basic Research Program of China [2014CB921002]; Key Research Program of Frontier Sciences CAS [QYZDJ-SSW-JSC010]
Indexed BySCI
Language英语
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/78102
Collection中国科学院金属研究所
Corresponding AuthorZhu, YL; Ma, XL (reprint author), Chinese Acad Sci, Shenyang Natl Lab Mat Sci, Inst Met Res, Wenhua Rd 72, Shenyang 110016, Peoples R China.; Ma, XL (reprint author), Lanzhou Univ Technol, Sch Mat Sci & Engn, Langongping Rd 287, Lanzhou 730050, Peoples R China.
Recommended Citation
GB/T 7714
Liu, Ying,Zhu, Yin-Lian,Tang, Yun-Long,et al. Local Enhancement of Polarization at PbTiO3/BiFeO3 Interfaces Mediated by Charge Transfer[J]. NANO LETTERS,2017,17(6):3619-3628.
APA Liu, Ying.,Zhu, Yin-Lian.,Tang, Yun-Long.,Wang, Yu-Jia.,Jiang, Yi-Xiao.,...&Ma, XL .(2017).Local Enhancement of Polarization at PbTiO3/BiFeO3 Interfaces Mediated by Charge Transfer.NANO LETTERS,17(6),3619-3628.
MLA Liu, Ying,et al."Local Enhancement of Polarization at PbTiO3/BiFeO3 Interfaces Mediated by Charge Transfer".NANO LETTERS 17.6(2017):3619-3628.
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