Manifestations of strain-relaxation in the structure of nano-sized Co-2 × 2 islands grown on Ag/Ge(111)-√3 × √3 surface

Xiao Lan Huang, Agnieszka Tomaszewska, Chun Liang Lin, Sung Lin Tsay, Chi Hao Chou, Tsu Yi Fu

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4 Citations (Scopus)

Abstract

We have examined strain-relaxation of Co-2 × 2 islands grown on the Ag/Ge(111)-√3 × √3 surface by analyzing scanning tunneling microscopy images. We have found that the Co-2 × 2 islands commonly adopt a more compact arrangement as compared to that of the Ge(111) substrate, however they differ in a degree of an atomic compactness. We have not found a distinct relation between strain-relaxation and the island height. Three groups of islands have been identified upon analyzing a correspondence between strain-relaxation and the island size: (i) small islands (not bigger than 80 nm 2) with a high atomic compactness, displaying fixed inter-row distances, (ii) small islands with unfixed distances between atomic rows, and (iii) big islands (bigger than 80 nm 2) with fixed inter-row distances, but with a less compact atomic arrangement compared to that of the first two groups. We propose a model to account for the relation between the relaxation and the island size.

Original languageEnglish
Pages (from-to)5304-5308
Number of pages5
JournalThin Solid Films
Volume520
Issue number16
DOIs
Publication statusPublished - 2012 Jun 1

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Keywords

  • Ag
  • Co
  • Ge(111)
  • Growth
  • Scanning tunneling microscopy
  • Strain

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films
  • Metals and Alloys
  • Materials Chemistry

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