Preparation and characterization of epitaxial Fe{sub 2-x}Ti{sub x}O{sub 3} films with various Ti concentrations (0.5<x<1.0)
- Department of Applied Chemistry, Graduate School of Natural Science and Technology, Okayama University, Tsushimanaka 3-1-1, Okayama 700-8530 (Japan)
- Department of Physics, Graduate School of Natural Science and Technology, Okayama University, Tsushimanaka 3-1-1, Okayama 700-8530 (Japan)
An ilmenite-hematite solid solution (Fe{sub 2-x}Ti{sub x}O{sub 3}) is one of the candidates for practical magnetic semiconductors with a high Curie temperature. We have prepared well-crystallized epitaxial Fe{sub 2-x}Ti{sub x}O{sub 3} films with a wide range of Ti concentrations--x=0.50, 0.60, 0.65, 0.76, 0.87, and 0.94--on {alpha}-Al{sub 2}O{sub 3}(001) substrates. The films are prepared by a reactive helicon plasma sputtering technique to evaporate Fe and TiO targets simultaneously under optimized oxygen pressure conditions. The structural characterizations of the films reveal that all films have a single phase of the ordered structure with R3 symmetry, where Ti-rich and Fe-rich layers are stacked alternately along the c axis. All films have large ferrimagnetic moments at low temperature, and room temperature magnetization is clearly observed at x<0.7. The inverse temperature dependence of the resistivities of the films indicates their semiconducting behavior. The film resistivities decrease with decreasing Ti concentration.
- OSTI ID:
- 21137427
- Journal Information:
- Journal of Applied Physics, Vol. 104, Issue 3; Other Information: DOI: 10.1063/1.2966298; (c) 2008 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0021-8979
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ALUMINIUM OXIDES
CURIE POINT
DEPOSITION
ELECTRIC CONDUCTIVITY
EPITAXY
FILMS
HEMATITE
ILMENITE
IRON COMPOUNDS
LAYERS
MAGNETIC MOMENTS
MAGNETIC SEMICONDUCTORS
MAGNETIZATION
OXYGEN
SOLID SOLUTIONS
SPUTTERING
SUBSTRATES
TEMPERATURE DEPENDENCE
TEMPERATURE RANGE 0273-0400 K
TITANIUM OXIDES