Exchange effect on alloy formation of Co/Ag/Pt(111) ultrathin films

The exchange between Co atoms and Ag atoms of Co/Ag/Pt(111) ultrathin films affects the formation of Co–Pt alloy. Ag atoms float to the top layers when the annealing temperature is high enough. With further annealing, the formation of the Co–Pt alloy is developed after the exchange between Ag and Co...

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Veröffentlicht in:	Surface science 1999-09, Vol.439 (1), p.L779-L784
Hauptverfasser:	Shern, C.S., Wu, Y.F., Wu, Y.E.
Format:	Artikel
Sprache:	eng
Schlagworte:	Applied sciences Atomic exchange Auger electron spectroscopy Cobalt Condensed matter: structure, mechanical and thermal properties Diffusion interface formation Exact sciences and technology Low-energy electron diffraction Metals. Metallurgy Physics Platinum surface Silver Solid surfaces and solid-solid interfaces Surface diffusion Surfaces and interfaces thin films and whiskers (structure and nonelectronic properties) Ultraviolet photoelectron spectroscopy
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Zusammenfassung:	The exchange between Co atoms and Ag atoms of Co/Ag/Pt(111) ultrathin films affects the formation of Co–Pt alloy. Ag atoms float to the top layers when the annealing temperature is high enough. With further annealing, the formation of the Co–Pt alloy is developed after the exchange between Ag and Co atoms is complete. The starting temperature of the exchange is independent of the coverage of Ag, but the temperature of the complete exchange depends on the thickness of Ag. The temperature is higher when the coverage of Ag increases. The mechanism of the exchange is discussed.
ISSN:	0039-6028 1879-2758
DOI:	10.1016/S0039-6028(99)00747-5