Thin films of iron oxides (Fe
3O
4 and γ-Fe
2O
3) were prepared by flash evaporation onto glass plates maintained at 100°C in vacuum of 2×10
-5mmHg. Their thickness ranged from 600Å to 3500Å. Their crystal structure was examined by electron diffraction and their magnetic property by ferromagnetic resonance (FMR) in the course of heat treatment at various atmospheric pressures.
Flash evaporation is effective in preparing a γ-Fe
2O
3 film but is not effective in preparing a Fe
3O
4 film: FMR in the former film shows a single peak of γ-Fe
2O
3, but in the latter film peaks of Fe
3O
4 and / or Fe as well as γ-Fe
2O
3 were observed. When the latter film is annealed at 300°C in vacuum of 5×10
-3mmHg, it can grow into a pure Fe
3O
4 film. Spin wave resonance failed to be observed in both γ-Fe
2O
3 and Fe
3O
4 films.
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