Inventors: Tsukamoto, Yuji;
Assignee: NEC Corporation (JP)
Primary Examiner: Thibodeau; Paul J.
Assistant Examiner:
Attorney, Agent or Firm: Laff, Whitesel, Conte & Saret
In a magnetic recording medium such as a magnetic disk, a protective coating excellent in both mechanical durability and corrosion resistance is provided on a layer of a magnetic recording material, which may be a metal film, by jointly using graphite fluoride and an inorganic nonmetallic hard compound which can be selected from oxides such as SiO.sub.2 and Al.sub.2 O.sub.3, nitrides such as SiN and AlN and carbides such as SiC and WC. The protective coating may be either a single layer of a mixture of graphite fluoride and a hard compound formed by co-sputter deposition or a two-layer coating made up of an inner layer of a hard compound and an outer layer of sputter deposited graphite fluoride. |
Optical Systems 
