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Imaging ultrathin Al 2 O 3 films with scanning tunneling microscopy

Chemical Physics Letters, ISSN: 0009-2614, Vol: 330, Issue: 3, Page: 226-230
2000
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Reproducible scanning tunneling microscopic (STM) images were obtained from ultrathin Al 2 O 3 films epitaxially grown on Re(0001). Initially, the oxide films grow two-dimensionally in a layer-by-layer fashion with well-ordered surface morphologies. As the oxide film thickens to ca. 9 monolayer equivalents (MLE), the surface roughens and becomes more disordered yet still exhibits significant long-range, hexagonal periodicity as indicated by low energy electron diffraction (LEED). Because of limited conductivity, films thicker than ca. 9 MLE could not be imaged.

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