Institut de Ciència de Materials de Barcelona (ICMAB-CSIC), Campus UAB, Bellaterra 08193, Catalonia, Spain.
Phys Chem Chem Phys. 2013 Nov 7;15(41):18274-80. doi: 10.1039/c3cp00001j.
Titanium diffusion from (001) SrTiO3 (STO) substrates into CoFe2O4 (CFO) films grown using pulsed laser deposition is reported. To elucidate the reasons for Ti interdiffusion, a comparative study of CFO films grown on MgAl2O4 (MAO) and STO substrates, buffered by thin STO and MAO layers, has been made. It is shown that whereas bottom STO layers always result in Ti migration, a thin MAO layer, only 8 nm thick, is effective in blocking it. We argue that this success relies on the lower mobility of Ti ions in the MAO lattice compared to that of CFO. This result should contribute to the development of high quality epitaxial heterostructures of dissimilar complex oxides.
从（001）SrTiO3（STO）衬底向通过脉冲激光沉积生长的 CoFe2O4（CFO）薄膜中扩散的钛被报道。为了阐明 Ti 互扩散的原因，对在 MgAl2O4（MAO）和 STO 衬底上生长的 CFO 薄膜进行了比较研究，这些薄膜由薄的 STO 和 MAO 层缓冲。结果表明，尽管底部 STO 层总是导致 Ti 迁移，但只有 8nm 厚的薄 MAO 层可有效地阻止 Ti 迁移。我们认为，这一成功依赖于 MAO 晶格中 Ti 离子的迁移率比 CFO 中的低。这一结果应该有助于开发具有不同复杂氧化物的高质量外延异质结构。
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