Effect of annealing of Ag ultrathin films on Co/Pt(111) surface

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Title:	Effect of annealing of Ag ultrathin films on Co/Pt(111) surface
Authors:	Shern, C. S. Tsay, J. S. Chen, S. L. Wu, Y. E. 吳月娥蔡志申
Contributors:	Journal of Applied Physics
Date:	1999
Issue Date:	2009-07-27 14:34:35 (UTC+8)
Abstract:	Low-energy electron diffraction was used to study the annealing effects of Ag ultrathin films on the surface of one monolayer Co/Pt(111). The intensity of the specular beam versus temperature has an unusual minimum point and maximum point. Further studies by Auger electron spectroscopy indicate that the adatoms of Ag become a best ordered state after the formation of Co-Pt alloy is complete. The new order state comes from the structure change of Co/Pt(111) and the smaller lattice mismatch between Ag and Pt. The electron density of states of d band shifts to a lower binding energy when the system starts to form the Co-Pt alloy measured by ultraviolet photoelectron spectroscopy. The chemical compositions at interfaces of the thin film were investigated by a depth profile before and after the annealing. The sputtering rates of Ag on the topmost layer of the unannealed film and the annealed film were calculated and comparatively studied. A shadow effect causes the different sputtering rates of these two ultrathin films. Keywords: silver, cobalt, platinum, annealing, metallic thin films, low energy electron diffraction, Auger effect, interface
Relation:	Journal of Applied Physics, V85(1), p. 228-232
Appears in Collections:	[Department of Applied Physics and Chemistry] Periodical Articles

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