Electric and magnetic properties of epitaxial Fe2-xTixO3+δ films

T. Fujii, K. Ayama, M. Nakanishi, M. Sohma, K. Kawaguchi, J. Takada

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

Solid solution films of the α-Fe2O3-FeTiO3 series are one of the candidates for noble half-metallic oxides. They were epitaxially formed on α-Al2O3(001) single crystalline substrates by O2-reactive evaporation method. The Fe2-xTixO3+δ films prepared at higher TS=973 K and with larger Ti content x ≥ 0.4 had the ilmenite structure with R3̄ symmetry. Other films at lower TS or with smaller x possessed the corundum structure with R3̄c. Only the films with R3̄ symmetry had large ferrimagnetic moments, though the observed spontaneous magnetization was less than half of the ideal value expected from the fully ordered structure. Room temperature resistivity of intermediate composites dropped to 10-1Ωcm due to the formation of the mixed valence states between Fe2+ and Fe3+. However the Fe2+ content of the films was rather small as compared with stoichiometric Fe2-xTixO3. The Ti-rich films had large oxygen nonstoichiometry of about δ=0.3.

Original languageEnglish
Pages (from-to)191-196
Number of pages6
JournalMaterials Research Society Symposium - Proceedings
Volume623
DOIs
Publication statusPublished - Jan 1 2000

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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