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中文摘要：
采用先进电子显微术在原子尺度研究了（001）单晶SrTiO3衬底上生长的纳米复合薄膜0．65BiFe03—0．35CoFe2O4的组织形态以及界面结构．BiFeO3（BFO）和CoFe2O4（CFO）两相在外延生长过程中自发相分离，形成自组织的复合纳米结构．磁性尖晶石CFO呈方块状均匀分布于铁电钙钛矿BFO基体中，并沿『0011方向外延生长，形成垂直的柱状纳米结构．两相具有简单的立方一立方取向关系，即【001]BFO／／[001]CFO和（100）BFO／／（100）cfo，且界面为{110}晶面．薄膜表面起伏不平，形成CFO{111}d,刻面而BFO则为平整的（001）表面．能谱分析结果表明各相成分均匀分布并无明显的元素互扩散发生．
英文摘要：
The morphologies and interface structure of self-assembled 0.65BiFeO3-O.35CoFe2o4 nanocomposite thin films on （001）-SrTiO3 single crystal substrates were studied by advanced transmission electron microscopy （TEM） techniques at the atomic scale. During the process of thin-film epitaxial growth, BiFeO3 （BFO） and CoFe2 04 （CFO） separate spontaneously and form a self-assembled composite nanostructure. The ferromagnetic spinel CFO forms nanopillars presenting a rectangular shape embedded in the ferroelectric perovskite BFO matrix, and both grow epitaxially along the [001] orientation and then get a vertical columnar nanostructure. The two phases give a cube-on-cube orientation relationship, [001]BFO//[001]CFO and （100）BFO//（100）CFO, and the interface between them lies in the {110} orientation. The surface of the composite film is rough with {111} facets of CFO and a smooth surface of BFO resides on the （001） plane. Energy-dispersive spectroscopy （EDS） studies show that the constituents of each phase present homogeneous distribution and no obvious interdiffusion is observed across the interface.
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