Scanning tunneling spectroscopy of c(2×2) reconstructed Fe thin-film surfaces

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

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13 Citations (Scopus)


Fe thin films with flat surfaces are obtained on a MgO(001) substrate at a growth temperature of 550 K. The surfaces with atomically flat and wide terraces exhibit a c(2×2) reconstructed structure. To evaluate the effect of impurity atoms at the surface on the surface structures, scanning tunneling spectroscopy (STS), reflection high energy electron diffraction (RHEED) and X-ray photoelectron spectroscopy (XPS) studies were performed. The differential conductivity (dI/dV) spectrum of the c(2×2) Fe(001) thin-film surfaces indicates an intense peak at the sample bias voltage of 0.4 V. Since there is no clear evidence of impurity adatoms forming such a surface structure, we expect that the topmost atoms are Fe, and that the observed peak originates from surface states.

Original languageEnglish
Pages (from-to)4334-4336
Number of pages3
JournalJapanese Journal of Applied Physics
Issue number6 B
Publication statusPublished - 2001 Jun


  • bcc-Fe(001)
  • c(2×2)
  • MgO(001)
  • Scanning tunneling microscopy
  • Scanning tunneling spectroscopy
  • Surface reconstruction
  • X-ray photoelectron spectroscopy


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