Alloying of Co ultrathin films on Pt(111) with Ag buffer layers

C. S. Shern, C. W. Su, Y. E. Wu, T. Y. Fu

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Abstract

The structure at the interfaces of Co/Ag/Pt(111) was studied by low-energy electron diffraction, ultraviolet photoelectron spectroscopy, Auger electron spectroscopy, and depth profiling. An atomic exchange occurs between Co and Ag before the formation of a Co-Pt alloy. Ag atoms start moving to the top at 425 K when the coverage of Co is one monolayer. The temperature of the complete exchange between Ag atoms and Co atoms is dependent on the thickness of the Ag buffer layer. The Co-Pt alloy develops after the atomic exchange is complete. The especially small surface free energy of Ag and large strain energy in this system are proposed as the driving force for the exchange.

Original languageEnglish
Pages (from-to)705-709
Number of pages5
JournalJournal of Applied Physics
Volume88
Issue number2
DOIs
Publication statusPublished - 2000 Jul 15

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ASJC Scopus subject areas

  • Physics and Astronomy(all)

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