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

Ching-Song Shern, Jyh-Shen Tsay, S. L. Chen, Y. E. Wu

Research output: Contribution to journalArticle

6 Citations (Scopus)

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.

Original languageEnglish
Pages (from-to)228-232
Number of pages5
JournalJournal of Applied Physics
Volume85
Issue number1
DOIs
Publication statusPublished - 1999 Dec 1

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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