The Fe(001)/Ag(001) interface in molecular-beam-epitaxy-grown (001) structures has been investigated using conversion electron M\"ossbauer spectroscopy. One monolayer of ⁵⁷Fe is used as a probe layer. The M\"ossbauer-effect study shows that the Fe/Ag interface consists of atomic terraces, one atomic layer in height. Three Fe sites can be distinguished at the Fe/Ag interface. The average size of the terraces can be determined from the relative intensity of the three components in the M\"ossbauer spectrum. By growing the sample at 420 K the terrace size can be increased significantly. However, at this temperature, diffusion of the ⁵⁷Fe into the underlying Fe layers becomes important.
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Schurer et al. (1993) studied this question.
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