Atomic-scale visualization of polarization pinning and relaxation at coherent BiFeO3/LaAlO3 interfaces

Rong Huang, Hang Chen Ding, Wen I. Liang, Yong Chao Gao, Xiao Dong Tang, Qing He, Chun Gang Duan, Ziqiang Zhu, Junhao Chu, Craig A.J. Fisher, Tsukasa Hirayama, Yuichi Ikuhara, Ying Hao Chu

    Research output: Contribution to journalArticlepeer-review

    26 Citations (Scopus)

    Abstract

    Complex oxide heterointerfaces, which play host to an incredible variety of interface physical phenomena, are of great current interest in introducing new functionalities to systems. Here, coherent super-tetragonal BiFeO 3/LaAlO3 and rhombohedral BiFeO3/LaAlO 3 heterointerfaces are investigated by using a combination of high-angle annular dark-field (HAADF) imaging and annular bright-field (ABF) imaging in a spherical aberration (Cs) corrected scanning transmission electron microscope (STEM), and first-principles calculations. The complicated ferroelectric polarization pinning and relaxation that occurs at both interfaces is revealed with atomic resolution, with a dramatic change in structure of BiFeO3, from cubic to super-tetragonal-like. The results enable a detailed explanation to be given of how non-bulk phase structures are stabilized in thin films of this material. Changes in lattice strain and symmetry in BiFeO3 (BFO) crystals at coherent T-BFO/LaAlO3 (LAO) and rhombohedral-BFO/LAO interfaces are imaged with atomic resolution using annular bright-field scanning transmission electron microscopy and first-principles calculations. A common pinned BFO layer and polarization relaxation at the interfaces are identified, providing insight into the ferroelectric behavior of thin films and the complex oxide heterointerfaces between them.

    Original languageEnglish
    Pages (from-to)793-799
    Number of pages7
    JournalAdvanced Functional Materials
    Volume24
    Issue number6
    DOIs
    Publication statusPublished - 2014 Feb 12

    Keywords

    • annular bright-field imaging
    • bismuth ferrite
    • heterointerfaces

    ASJC Scopus subject areas

    • Chemistry(all)
    • Materials Science(all)
    • Condensed Matter Physics

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