多铁性
铁电性
材料科学
极化(电化学)
凝聚态物理
纳米尺度
相界
扫描透射电子显微镜
压电
薄膜
纳米技术
透射电子显微镜
相(物质)
光电子学
电介质
物理
量子力学
物理化学
复合材料
化学
作者
Linze Li,Xiaoxing Cheng,Jacob R. Jokisaari,Peng Gao,Jason Britson,Carolina Adamo,Colin Heikes,Darrell G. Schlom,Long‐Qing Chen,Xiaoqing Pan
标识
DOI:10.1103/physrevlett.120.137602
摘要
Continuous developments in nanotechnology require new approaches to materials synthesis that can produce novel functional structures. Here, we show that nanoscale defects, such as nonstoichiometric nanoregions (NSNRs), can act as nano-building blocks for creating complex electrical polarization structures in the prototypical multiferroic ${\mathrm{BiFeO}}_{3}$. An array of charged NSNRs are produced in ${\mathrm{BiFeO}}_{3}$ thin films by tuning the substrate temperature during film growth. Atomic-scale scanning transmission electron microscopy imaging reveals exotic polarization rotation patterns around these NSNRs. These polarization patterns resemble hedgehog or vortex topologies and can cause local changes in lattice symmetries leading to mixed-phase structures resembling the morphotropic phase boundary with high piezoelectricity. Phase-field simulations indicate that the observed polarization configurations are mainly induced by charged states at the NSNRs. Engineering defects thus may provide a new route for developing ferroelectric- or multiferroic-based nanodevices.
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