IUVSTA 15th International Vacuum Congress (IVC-15), AVS 48th International Symposium (AVS-48), 11th International Conference on Solid Surfaces (ICSS-11)
    Surface Science Monday Sessions
       Session SS2-MoP

Paper SS2-MoP12
Initial Growth and Alloy Formation of Ni Ultrathin Films on Pt(111)

Monday, October 29, 2001, 5:30 pm, Room 134/135

Session: Surfaces and Interfaces Poster Session
Presenter: C.W. Su, National Taiwan Normal University
Authors: C.W. Su, National Taiwan Normal University
Y.E. Wu, National Taiwan Normal University
C.S. Shern, National Taiwan Normal University
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Low-energy electron diffraction (LEED), Auger electron spectroscopy (AES) and Ultraviolet photoelectron spectroscopy (UPS) were used to study of the initial growth of Ni ultrathin films on Pt(111) at room temperature. As the coverage of Ni between 0.3 ML to 1.0 ML , a (@sr@(3)*@sr@(3))R30° commensurate structure was observed. As the coverage increases from 1 ML to 1.2 ML, the superposition of Pt(1x1) and epitaxial Ni(1x1) LEED pattern is formed. When the coverage of Ni increases from 1.3 ML to 6 ML, the structure is changed to the incommensurate epitaxy with fine satellites around the (1x1) hexagonal LEED pattern. Deposition of Ni films more than 7 ML up to 12 ML, the p(2x2) LEED pattern is appeared gradually. After high temperature annealing, the formation of Ni-Pt alloy with different coverages of Ni was confirmed by AES and UPS. The starting temperature of alloy formation increases as the coverage of Ni increases. The density of state also shows some interesting changes during the thermal annealing process.