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We produced single-crystalline Fe nanodot arrays grown in situ on a W(110) substrate in an ultrahigh vacuum system. An alumina shadow mask with perfectly ordered holes was used for Fe deposition. Polycrystalline Fe nanodots could be crystallized to single-domain nanodots by thermal annealing. After annealing, Fe wets tungsten substrate with one monolayer, but Fe islands neither coalesce nor form an alloy with the substrate.
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Choi et al. (2004) studied this question.
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