| 摘要 |
PURPOSE:To prevent the fluctuation in the magnetic characteristic of a ferromagnetic oxide film owing to the surface condition of an anodically oxidized film and to obtain a stable magnetic characteristic by providing a nonmagnetic iron oxide film between the anodically oxidized film and the ferromagnetic oxide film. CONSTITUTION:An anodically oxidized film 2 is formed on a substrate 1 and further a ferromagnetic iron oxide film 4 is formed, via a nonmagnetic oxide film 3 thereon. A lubricating protective film 5 is formed on the film 4. The film 4 is separated from the film 2 by the film 3 and the fluctuation in the magnetic characteristic, more particularly, coercive force and square ratio of the film 4 owing to the surface condition of the film 2 is prevented. The substrate 1 is an Al or Al alloy substrate, and the film 4 consists of gamma-Fe2O3 and the film 3 of alpha-Fe2O3. The film 2 is obtd. by anodizing the substrate 1. |
