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要旨

We studied the preparation of well-ordered thin Fe₃O₄(001) films on a metallic substrate, Pt(100), using LEED and STM. The results show that film growth either by Fe reactive deposition in oxygen or by deposition–oxidation cycles onto pure Pt(100) results primarily in (111)-oriented surfaces. To grow Fe₃O₄(001) films, the preparation must include deposition of an Fe buffer layer as previously suggested for the growth of Fe₃O₄(001) on MgO(001) (Spiridis et al. Phys. Rev. B 74 (2006) 155423). Two stable (so called “dimer”- and B-layer) surface terminations were observed, both exhibiting a (√2 × √2)R45⁰ reconstruction. Several intermediate, Fe-rich terminations were observed during the annealing process of an initially dimer-like structure. The process critically depends on the thickness of the buffer layer, which can be used as a tuning parameter for surface structures.