Atomic scale observation of domain boundaries on c(2 × 2) Fe(001) thin film surfaces

Hirofumi Oka, Agus Subagyo, Makoto Sawamura, Kazuhisa Sueoka, Koichi Mukasa

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5 Citations (Scopus)


Scanning tunneling microscopy (STM) measurements reveal that Fe thin films epitaxially grown on a MgO(001) substrate under appropriate conditions have an atomic step-terrace surface with a c(2 × 2) surface reconstruction, and that this surface is often accompanied by line-like patterns along the Fe〈110〉 direction. We have investigated the electronic properties of the patterns in detail by atomically resolved STM. We found that the pattern is a domain phase boundary of the c(2 × 2) domains, and that the domain boundaries consist of atoms exhibiting a (1 × 1) structure. The STM image shows remarkable bias-voltage dependency as indicated by the contrast inversion between the patterns and c(2 × 2) domains as the polarity of the applied bias-voltage is changed, and the contrast achieved its maximum value at +0.2 V. This bias-voltage dependency of the patterns can be explained by the existence of surface states which are observed at around 0.2 eV above the Fermi level on the Fe(001) (1 × 1) surface and 0.4 eV on the c(2 × 2) domains.

Original languageEnglish
Pages (from-to)4969-4972
Number of pages4
JournalJapanese Journal of Applied Physics
Issue number7 B
Publication statusPublished - 2002 Jul


  • Domain boundary
  • MgO(001)
  • Scanning tunneling microscopy
  • Surface reconstruction
  • Surface states
  • bcc-Fe(001)
  • c(2 × 2)


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