Title

Growth of iron oxide on Cu(001) at elevated temperature

Document Type

Article

Publication Date

11-20-1999

Abstract

The morphology of ultrathin Fe oxide films grown on Cu(001) was studied by STM and LEED. The oxide was grown in situ by high-temperature oxidation of Fe films deposited on a Cu(001) substrate at room temperature. The Fe films were observed to grow in a layer-by-layer manner as observed previously. Oxidation was accomplished by annealing the sample to 810 K in ambient oxygen. Two distinct oxide structures were observed depending on the initial Fe coverage. For Fe films with a thickness of less than 2 ML, Fe1-xO(111) forms with preferential island growth along the {110} directions. These narrow strips of oxide exhibit antiphase domain boundaries producing dark stripes running along the island, as well as a hexagonal superstructure. For initial Fe coverage exceeding 2 ML, a new oxide phase forms, consisting of uniformly thick patches of oxide with large, atomically flat terraces. This oxide also grows in strips, but these are oriented 15° from the [010] azimuth, and the hexagonal superstructure is rotated by 30° from the Fe1-xO. The second phase is identified as Fe3O4(111), consistent with STM, LEED, and thermodynamic data.

Publication Source (Journal or Book title)

Surface Science

First Page

223

Last Page

238

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