AVS 45th International Symposium
    Surface Science Division Thursday Sessions
       Session SS-ThP

Paper SS-ThP19
Growth of Ultrathin Mn Films on W(110)

Thursday, November 5, 1998, 5:30 pm, Room Hall A

Session: Surface Science Division Poster Session
Presenter: M. Hennefarth, University of Hamburg, Germany
Authors: M. Bode, University of Hamburg, Germany
M. Hennefarth, University of Hamburg, Germany
M. Getzlaff, University of Hamburg, Germany
R. Wiesendanger, University of Hamburg, Germany
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At room temperature bulk Manganese (Mn) exhibits complicated cubic structures with large unit cells. Simple crystallographic structures like fcc @gamma@- and the bcc @delta@-Mn are high temperature phases. However, it is well known that thin solid films can be stabilized on appropriate substrates in crystalline symmetries and lattice constants that are far from those of the corresponding bulk material. We have studied the growth of Mn on W(110)-substrates by means of STM and LEED. With our home-build MBE-STM@footnote 1@ we obtained growth sequences of particular microscopic locations. Up to a coverage of 0.5ML the nucleation of first monolayer islands which are elongated along the [110]-direction could be observed. The nucleation of second monolayer patches occurs before the completion of the first ML. We found that up to a total coverage of 2 monolayers Mn grows pseudomorphically on W(110), i.e. in the bcc @delta@-phase and strained by approximately 10%, as indicated by the absence of satellite spots in the LEED-pattern. If the total amount of deposited material exceeds 2ML we observed the evolution of rectangular islands with a minimum height of 5ML. This coincides with an increasing diffuse background in the LEED-pattern. Further deposition leads to a very rough surface morphology. @FootnoteText@ @footnote 1@ Ch. Witt, U. Mick, M. Bode, and R. Wiesendanger, Rev. Sci. Instrum. 68, 1455 (1997).