极化(电化学)
铁电性
成核
材料科学
薄膜
表面电荷
涡流
离子键合
凝聚态物理
光电子学
纳米技术
离子
化学
物理
电介质
热力学
物理化学
有机化学
作者
Di Liu,Ru Zhao,Hasnain Mehdi Jafri,Junsheng Wang,Houbing Huang
摘要
Understanding and controlling surface charge-induced polarization switching have attracted interest of researchers extensively, and the rich physical interactions between ionic and atomic displacements play a significant role in polarization reversal. In this work, we investigated the mechanism of surface charge-induced polarization switching in PbZr0.2Ti0.8O3 and BiFeO3 thin films by phase-field simulations. We observed ferroelectric polarization reversal by applying positive/negative charge on the top of a thin film, because the double well of free energy becomes asymmetric by applying surface charge. It is found that the nucleation of switching always starts from the surface and gradually expands into the whole film. In BiFeO3 thin films, the formation of an anti-vortex domain provides topological protection for hindering surface charge-induced polarization switching. The present study, therefore, contributes to a better understanding of charge-induced polarization switching and provides guidance for the experimental design of reversible electronic devices by selecting the appropriate polarity region.
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