Back to results
US 4,399,013 AGranted
Method of producing a magnetic recording medium
AssigneeMatsushita Electric Industrial Co., Ltd.
InventorsRyuji Sugita, Toshiaki Kunieda
Life of this patent
Estimating the term…
Abstract
There is provided a method of producing a magnetic recording medium having a magnetic layer composed mostly of Co and Cr. The method is characterized by vacuum vapor deposition of components which are to form the magnetic layer under conditions where atoms of the evaporated components are in the discharge state.
Claims5
A method of producing a perpendicular magnetic recording medium, including a step of forming a magnetic layer as a thin film composed predominantly of cobalt and chromium on a substrate, wherein said thin film is formed by vacuum vapor deposition under conditions which comprise:
- producing a vapor composed predominantly of cobalt and chromium from an evaporation source, causing electrons to be produced in proximity to said evaporation source and causing these electrons to reach the substrate surface in an amount sufficient to cause the atoms of vaporized film-forming material at or near the substrate to be in the discharge state.
Dependencies are inferred from the claim text.