Growth of Thin Iron Films on Gold and Rocksalt Substrates at 80 K

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Abstract
Gold layers, approximately 1000 Å thick, have been evaporated in ultrahigh vacuum onto air-cleaved rocksalt substrates, held at 80 K. Immediately following the gold evaporation thin iron films have been deposited on top of the gold layers. Part of the iron was also evaporated directly onto the rocksalt. All the layers have been covered with a carbon film at low temperature. Nucleation and growth of the iron layers on top of the Au films have been studied after dissolving the Au quantitatively away. For iron layers of equal thickness the differences in film topology have been investigated. For the same stage of growth these differences can be explained by taking the various binding energies between overgrowth and substrate into account. The results can be used to explain relations between the evaporation sequence and changes in the critical temperature of superconductor-normal metal packages in the proximity effect.
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