Observations of reversible and irreversible structural transitions of cobalt on Si (1 1 1) with LEEM

R. J. Phaneuf, Y. Hong, S. Horch, Peter Bennett

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

We present real time images of the evolution of the structure of the Si (1 1 1) surface during the deposition of cobalt at elevated temperatures, acquired using low-energy electron microscopy. The system follows a sequence of coexisting ordered and disordered phases, consistent with two-dimensional eutectic behavior. Reversible temperature driven transitions are observed between the ordered Si (1 1 1)(7 X 7) reconstructed phase and a disordered lattice gas of Co-containing ring-clusters (RC), indicating a local equilibrium between these structures. Only irreversible temperature driven transitions from an ordered (√7 x √7)-RC phase to the disordered phase are observed. The nucleation and growth of stable islands, mostly CoSi2, depletes the Co-rich (√7 x √7) structure of Co, resulting in the formation and growth of adjacent regions of the Co-poor disordered '(1 x 1)'-RC phase.

Original languageEnglish (US)
Pages (from-to)13-20
Number of pages8
JournalMicron
Volume30
Issue number1
DOIs
StatePublished - Feb 1999

Fingerprint

Transition Temperature
Cobalt
Superconducting transition temperature
cobalt
rings
Growth
Islands
Eutectics
Electron microscopy
Electron Microscopy
Nucleation
Gases
eutectics
Temperature
temperature
electron microscopy
nucleation
gases
energy

Keywords

  • Electron microscopy
  • Low-energy electron microscopy
  • Silicides
  • Surface phase separation
  • Surface phase transitions
  • Surfaces

ASJC Scopus subject areas

  • Cell Biology
  • Materials Science(all)
  • Instrumentation

Cite this

Observations of reversible and irreversible structural transitions of cobalt on Si (1 1 1) with LEEM. / Phaneuf, R. J.; Hong, Y.; Horch, S.; Bennett, Peter.

In: Micron, Vol. 30, No. 1, 02.1999, p. 13-20.

Research output: Contribution to journalArticle

Phaneuf, R. J. ; Hong, Y. ; Horch, S. ; Bennett, Peter. / Observations of reversible and irreversible structural transitions of cobalt on Si (1 1 1) with LEEM. In: Micron. 1999 ; Vol. 30, No. 1. pp. 13-20.
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