LEEM Studies of Phase Separations and Surface Depletion of Coand Nion Si(111)

R. J. Phaneuf and P. A. Bennett
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R. J. Phaneuf: Department of Physics and Astronomy, University of Maryland and Laboratory Physical Sciences, College Park, MD 20742-4111, USA
P. A. Bennett: Department of Physics and Astronomy, Arizona State University, Tempe, Arizona 85287-1504, USA

Surface Review and Letters (SRL), 1998, vol. 05, issue 06, 1179-1188

Abstract: Low energy electron microscopy images of Si(111) surfaces during sub monolayer 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$\sqrt{7}\times\sqrt{7}$ring cluster phase forms for Co/Si(111), but not for Ni/Si(111). The$\sqrt{7}\times\sqrt{7}$phase disappears irreversibly on heating, due to the nucleation and growth of stable silicide islands.

Date: 1998
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DOI: 10.1142/S0218625X98001511

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