Abstract
We report on the self-organized growth of a regular array of Fe nanoclusters on a nanopatterned magnetite surface. Under oxidizing preparation conditions, the (111) surface of magnetite exhibits a regular superstructure with three-fold symmetry and a $42\phantom{\rule{0.3em}{0ex}}\mathrm{\AA{}}$ periodicity. This superstructure represents an oxygen-terminated (111) surface, which is reconstructed to form a periodically strained surface. A Fe film of $0.5\phantom{\rule{0.3em}{0ex}}\mathrm{\AA{}}$ thickness was deposited on this surface at room temperature. Fe nanoclusters are formed on top of the surface superstructure creating a regular array with the periodicity of the superstructure. We demonstrate that at higher coverage Fe growth switches from two- to three-dimensional mode. In the areas of the surface where the strain pattern is not formed, random nucleation of Fe was observed.
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