Significant surface flattening effect by Au addition for Cu growth on Cu3Au(001)

Takayuki Kojima, Masaki Mizuguchi, Koki Takanashi

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)

Abstract

To prepare a flat surface of Cu film on Cu3Au(001), we utilized the effect of Au addition to Cu, and investigated the dependence of the growth mode on the amount of Au added. We grew Cu-x%Au (x = 0-20) films on Cu 3Au(001) underlayers by co-deposition and observed the surface morphology by scanning tunneling microscopy. For Cu film without Au addition, three-dimensional islands were observed on the surface while flat two-dimensional surfaces were observed for Cu film with only 2.5%Au addition. This difference in the growth mode was found to be due to surface segregation of Au revealed by in situ Auger electron spectroscopy. It was considered that the Au atoms acted like a surfactant and avoided three-dimensional island growth by suppression of the accumulation of epitaxial strain in Cu-x%Au films. However, the terrace size decreased with x. This decrease was thought to be due to an increase in an effective Ehrlich-Schwoebel barrier. The surface flattening effect by addition of another element would be obtained in other systems as well by employing a suitable element.

Original languageEnglish
Pages (from-to)44-48
Number of pages5
JournalSurface Science
Volume619
DOIs
Publication statusPublished - 2014 Jan

Keywords

  • Au
  • Cu
  • Epitaxial growth
  • Flat film
  • Surface segregation
  • Surfactant

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films
  • Materials Chemistry

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