Alloy formation of Co/Ni/Pt(1 1 1)

H. Y. Ho, Y. S. Lin, E. J. Huang, Y. J. Chen, C. S. Shern

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Abstract

The initial growth and alloy formation of ultrathin Co films deposited on 1 ML Ni/Pt(1 1 1) were investigated by Auger electron spectroscopy (AES), low energy electron diffraction (LEED), and ultraviolet photoelectron spectroscopy (UPS). A sequence of samples of dCo Co/1 ML Ni/Pt(1 1 1) (dCo = 1, 2, and 3 ML) were prepared at room temperature, and then heated up to investigate the diffusion process. The Co and Ni atoms intermix at lower annealing temperature, and Co-Ni intermixing layer diffuses into the Pt substrate to form Ni-Co-Pt alloys at higher annealing temperature. The diffusion temperatures are Co coverage dependent. The evolution of UPS with annealing temperatures also shows the formation of surface alloys. Some interesting LEED patterns of 1 ML Co/1 ML Ni/Pt(1 1 1) show the formation of ordered alloys at different annealing temperature ranges. Further studies in the Curie temperature and concentration analysis, show that the ordered alloys corresponding to different LEED patterns are NixCo1-xPt and NixCo1-xPt3. The relationship between the interface structure and magnetic properties was investigated.

Original languageEnglish
Pages (from-to)615-621
Number of pages7
JournalSurface Science
Volume601
Issue number3
DOIs
Publication statusPublished - 2007 Feb 1

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Keywords

  • Auger electron spectroscopy
  • Cobalt
  • Low energy electron diffraction
  • Magneto-optical Kerr effect
  • Nickel
  • Platinum
  • Ultraviolet photoelectron spectroscopy

ASJC Scopus subject areas

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

Cite this

Ho, H. Y., Lin, Y. S., Huang, E. J., Chen, Y. J., & Shern, C. S. (2007). Alloy formation of Co/Ni/Pt(1 1 1). Surface Science, 601(3), 615-621. https://doi.org/10.1016/j.susc.2006.10.028