Highly oriented epitaxial CaFe2O4 thin films on TiO2 substrates grown by pulsed-laser deposition

Nana Nishiyama, Hisanori Mashiko, Kohei Yoshimatsu, Koji Horiba, Hiroshi Kumigashira, Akira Ohtomo

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)


CaFe2O4 (CFO) is an oxide semiconductor being usable for a photocathode, but its single crystal is so far grown only by a high-pressure bulk synthesis method. Using pulsed-laser deposition, we have obtained the (010)-oriented CFO films on TiO2 (100) substrates. The epitaxial structure included twin domains with 1.5° tilting from the surface normal and sixfold domains with in-plane rotations of ± 70° with respect to the b axis of TiO2, which was explained by taking a number of probable arrangements between FeO6 and TiO6 octahedra into account. X-ray absorption spectroscopy and ultra-violet-visible-near-infrared spectroscopy measurements revealed the electronic properties similar to those of bulk and thus the CFO films would be suitable to the investigation of photocathodic performance.

Original languageEnglish
Pages (from-to)406-409
Number of pages4
JournalThin Solid Films
Publication statusPublished - 2017 Sept 30
Externally publishedYes


  • CaFeO
  • Heteroepitaxy
  • Pulsed-laser deposition
  • X-ray absorption spectroscopy
  • X-ray diffraction

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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