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• W2619181587 endingPage "3628" @default.
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• W2619181587 abstract "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 δTi, δO1, and δO2 in the PbTiO3 layer near the head-to-tail polarized interface, suggesting an over ∼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." @default.
• W2619181587 created "2017-06-05" @default.
• W2619181587 creator A5015676515 @default.
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• W2619181587 date "2017-05-31" @default.
• W2619181587 modified "2023-10-14" @default.
• W2619181587 title "Local Enhancement of Polarization at PbTiO₃/BiFeO₃ Interfaces Mediated by Charge Transfer" @default.
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• W2619181587 doi "https://doi.org/10.1021/acs.nanolett.7b00788" @default.
• W2619181587 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/28541701" @default.
• W2619181587 hasPublicationYear "2017" @default.
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