Leem studies of phase separations and surface depletion of Co and Ni on Si(111)

R. J. Phaneuf, Peter Bennett

Research output: Contribution to journalArticlepeer-review

9 Scopus citations


Low energy electron microscopy images of Si(111) surfaces during submonolayer deposition of Co or Ni at temperatures near 700° C reveal a phase separation into a disordered "ring cluster" phase and the ordered 7 × 7 reconstruction. For Co/Si(111) we find that temperature-driven phase separations at a fixed dose are reversible and occur at a fixed surface coverage. The shape of the phase boundary reveals a repulsive interaction between Co-containing ring clusters in the disordered phase. For Ni/Si(111), dissolution into the bulk prevents reversible separations between surface phases. At coverages close to 1/7 ML an ordered close-packed √7 × √7 ring cluster phase forms for Co/Si(111), but not for Ni/Si(111). The √7 × √7 phase disappears irreversibly on heating, due to the nucleation and growth of stable silicide islands.

Original languageEnglish (US)
Pages (from-to)1179-1188
Number of pages10
JournalSurface Review and Letters
Issue number6
StatePublished - Jan 1 1998

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films
  • Materials Chemistry


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