Abstract
Molecular beam epitaxy was used to grow MnF 2 films on a Si(111) substrate with a thin CaF 2 buffer at room temperature. It was found that films thinner than three molecular layers have a cubic fluorite crystal structure inherited from CaF 2 . The MnF 2 film is coherent to the substrate and has an interlayer spacing of 0.305 ± 0.005 nm, which is 3% less than for bulk CaF 2 . Thicker films have the tetragonal rutile structure, so the film surface is the (110) plane of MnF 2 with its [001] axis parallel to (110) directions of the substrate.
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