Preparation and characterization of (111)-oriented Fe3O 4 films deposited on sapphire

Tatsuo Fujii, M. Takano, R. Katano, Y. Bando, Y. Isozumi

Research output: Contribution to journalArticle

81 Citations (Scopus)

Abstract

Films of various iron oxides including FeO, Fe3 O4, and α-Fe2 O3 were formed on the α-Al 2 O3 (0001) surface by a reactive vapor deposition method and characterized by x-ray diffraction and conversion electron Mössbauer spectroscopy (CEMS). The formation range for each phase was determined as a function of the substrate temperature (Ts) and oxygen partial pressure (PO2). Typically, the deposition of (111)-oriented epitaxial magnetite films could be performed at low temperatures of Ts =523∼623 K and PO2 =1.0-5.0×10-4 Torr. Good stoichiometry of the as-grown films were confirmed by CEMS, and the Verwey transition was clearly detected by measurements of resistivity and CEMS down to 77 K. However, the large lattice mismatch between the substrate and Fe 3 O4 resulted in a columnar particle growth. The initially grown phase on such a mismatched substrate was specifically characterized by depositing the Mössbauer active isotope, 57 Fe, only at the deepest layers. On the other hand, by depositing 57 Fe only in the topmost layers, surface layers of well-crystallized films have been found to be rather stable against oxidation.

Original languageEnglish
Pages (from-to)3168-3172
Number of pages5
JournalJournal of Applied Physics
Volume66
Issue number7
DOIs
Publication statusPublished - 1989
Externally publishedYes

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sapphire
electron spectroscopy
preparation
iron oxides
magnetite
partial pressure
stoichiometry
surface layers
x ray diffraction
isotopes
vapor deposition
oxidation
electrical resistivity
oxygen
temperature

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

Cite this

Preparation and characterization of (111)-oriented Fe3O 4 films deposited on sapphire. / Fujii, Tatsuo; Takano, M.; Katano, R.; Bando, Y.; Isozumi, Y.

In: Journal of Applied Physics, Vol. 66, No. 7, 1989, p. 3168-3172.

Research output: Contribution to journalArticle

Fujii, Tatsuo ; Takano, M. ; Katano, R. ; Bando, Y. ; Isozumi, Y. / Preparation and characterization of (111)-oriented Fe3O 4 films deposited on sapphire. In: Journal of Applied Physics. 1989 ; Vol. 66, No. 7. pp. 3168-3172.
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