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

R. J. Phaneuf, Peter Bennett

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

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
Volume5
Issue number6
StatePublished - 1998

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Phase separation
depletion
rings
Phase boundaries
Electron microscopy
electron microscopy
dissolving
Dissolution
Nucleation
nucleation
Heating
dosage
Temperature
heating
temperature
interactions
energy
ML 7

ASJC Scopus subject areas

  • Materials Science(all)
  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Atomic and Molecular Physics, and Optics
  • Surfaces and Interfaces

Cite this

Leem studies of phase separations and surface depletion of Co and Ni on Si(111). / Phaneuf, R. J.; Bennett, Peter.

In: Surface Review and Letters, Vol. 5, No. 6, 1998, p. 1179-1188.

Research output: Contribution to journalArticle

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