| 摘要 |
PURPOSE:To improve weatherability by forming a thin film of a ferromagnetic metal and a layer of a chromium compd. on a non-magnetic base in such a way that the former is formed of the particles of columnar ferromagnetic material assembled in the direction diagonal to the surface of the base and that the surface of the particles of the ferromagnetic material is coated with the latter. CONSTITUTION:A ferromagnetic metal is diagonally deposited by evaporation on a base 1 to form a columnar structure 2 diagonal thereto. The particle size of the columnar structure is about 100-900Angstrom if the thin metallic film is formed to 1,500Angstrom thickness. An alloy contg. 75wt% Co is particularly preferred for the magnetic metallic material. A chromium compd. layer 4 is formed on said thin film layer in such a way as to coat the particles of the columnar structure with a film of 10-150Angstrom thickness. The chromium compd. layer refers to a layer of Cr, Cr-O, etc. The chromium compd. layer is so formed by a diagonal vapor deposition method, etc. that said layers intrude in the gap parts in the columnar structure of the thin metallic film. The incident angle direction in the diagonal vapor deposition method is maintained in the same incident angle direction as in the stage of preparing the thin metallic film.
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