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题名: Controlled Growth and Atomic-Scale Mapping of Charged Heterointerfaces in PbTiO3/BiFeO3 Bilayers
作者: Liu, Ying;  Zhu, Yin-Lian;  Tang, Yun-Long;  Wang, Yu-Jia;  Li, Shuang;  Zhang, Si-Rui;  Han, Meng-Jiao;  Ma, Jin-Yuan;  Suriyaprakash, Jagadeesh;  Ma, Xiu-Liang
发表日期: 2017-8-2
摘要: Functional oxide interfaces have received a great deal of attention owing to their intriguing physical properties induced by the interplay of lattice, orbital, charge, and spin degrees of freedom. Atomic-scale precision growth of the oxide interface opens new corridors to manipulate the correlated features in nanoelectronics devices. Here, we demonstrate that both head-to-head positively charged and tail-to-tail negatively charged BiFeO3/PbTiO3 (BFO/PTO) heterointerfaces were successfully fabricated by designing the BFO/PTO film system deliberately. Aberration-corrected scanning transmission electron microscopic mapping reveals a head-to-head polarization configuration present at the BFO/PTO interface, when the film was deposited directly on a SrTiO3 (001) substrate. The interfacial atomic structure is reconstructed, and the interfacial width is determined to be 5-6 unit cells. The polarization on both sides of the interface is remarkably enhanced. Atomic-scale structural and chemical element analyses exhibit that the reconstructed interface is rich in oxygen, which effectively compensates for the positive bound charges at the head-to-head polarized BFO/PTO interface. In contrast to the head-to-head polarization configuration, the tail-to-tail BFO/PTO interface exhibits a perfect coherency, when SrRuO3 was introduced as a buffer layer on the substrates prior to the film growth. The width of this tail-to-tail interface is estimated to be 3-4 unit cells, and oxygen vacancies are supposed to screen the negative polarization bound charge. The formation mechanism of these distinct interfaces was discussed from the perspective of charge redistribution.
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Recommended Citation:
Liu, Ying,Zhu, Yin-Lian,Tang, Yun-Long,et al. Controlled Growth And Atomic-scale Mapping Of Charged Heterointerfaces In Pbtio3/bifeo3 Bilayers[J]. Amer Chemical Soc,2017,9(30):25578-25586.

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