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Ag Layers on Cu(110): Bonding, Structure, and Stability

Published online by Cambridge University Press:  25 February 2011

T. N. Taylor ,
M. A. Hoffbauer ,
L. Borodovsky ,
J. G. Beery  and
C. J. Maggiore
T. N. Taylor
Affiliation:
Chemical and Laser Sciences Division Los Alamos National Laboratory, Los Alamos, NM 87545
M. A. Hoffbauer
Affiliation:
Chemical and Laser Sciences Division Los Alamos National Laboratory, Los Alamos, NM 87545
L. Borodovsky
Affiliation:
Mechanical and Electronic Engineering Division, Los Alamos National Laboratory, Los Alamos, NM 87545
J. G. Beery
Affiliation:
Mechanical and Electronic Engineering Division, Los Alamos National Laboratory, Los Alamos, NM 87545
C. J. Maggiore
Affiliation:
Mechanical and Electronic Engineering Division, Los Alamos National Laboratory, Los Alamos, NM 87545
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Abstract

The atomic-level properties ( bonding, structure, composition ) and thermal stability of Ag overlayers on Cu(110) have been investigated using combined surface and high energy ion beam techniques. Analysis of the first Ag adatom layer with LEED shows that the Ag is initially confined to the [110] troughs and that further deposition results in a Ag(111) layer exhibiting c(2×4) symmetry. Rutherford backscattering analysis gives absolute coverages that are consistent with the surface science coverage determination. Thermal desorption of CO from the trough composite reveals a lower ( more Ag-like ) binding energy than that for clean Cu(110). Continuous films grown cold at thicknesses <115 Å are found to agglomerate above 500 K exposing a tenacious Ag-Cu interface like that formed by one monolayer deposition. Ion beam analysis has been employed to characterize the agglomerate coverage and depth distribution for these degraded films. Thin films grown 900Å thick exhibit much higher thermal stability, giving detectable interfacial degradation only after heating above 725 K.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 83: Symposium J – Physical and Chemical Properties of Thin Metal Overlayers and Alloy Surfaces , 1986 , 95
Copyright
Copyright © Materials Research Society 1987

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References

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