An atomic-scale study of the Co induced dendrite formation on Pt(111)

E. Lundgren, B. Stanka, W. Koprolin, M. Schmid and P. Varga

Institut für Allgemeine Physik, Technische Universität Wien, A-1040 Wien, Austria

Surf. Sci. 423 (1999) 357-363

We have studied the initial growth of Co on the Pt(111) surface in a temperature range of 300-400 K with scanning tunneling microscopy, low energy ion scattering and Auger electron spectroscopy. In agreement with previous work by Grütter and Dürig, when depositing 0.1 ML Co on Pt(111) at 400 K, the formation of large dendrites are observed. These dendrites are formed in conjunction with a Co induced local reconstruction of the Pt(111) surface resulting in dislocations. The dendrites, however, show no evidence for any dislocations below their surface, the local reconstruction is observed to be lifted by the formation of the dendrites. LEIS data suggest that the dendrites consist mainly of Pt, implying, together with the STM data, that Co is incorporated underneath the Pt. A model for this process is proposed.

Corresponding author: M. Schmid (schmid< encoded email address >).

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