Magnetic recording medium and method of fabricating the same
AssigneeSony Corporation
InventorsYasumi Sato, Jota Ito
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Abstract
A method of fabricating a low-noise, high-output and large-capacity magnetic recording medium compatible with the AIT3 format in which a metal magnetic film is formed by the vacuum evaporation process under supply of oxygen is disclosed. In the vacuum evaporation process, the running speed of a non-magnetic support is controlled within a range from 150 to 200 m/min, and on thus continuously fast-running, non-magnetic support, a Co magnetic thin film is formed under supply of oxygen so as to achieve a coercive force Hc of the Co magnetic thin film of 100 to 115 kA/m, and a squareness ratio of 0.79 or larger.
Claims4
A magnetic recording medium being of evaporation-type and having a non-magnetic support and a magnetic layer comprising at least a magnetic metal thin film provided thereon, said magnetic metal thin film having a coercive force Hc of 100 to 115 kA/m and a squareness ratio Rs of 0.79 or larger.
A method of fabricating a magnetic recording medium, wherein:
- a magnetic layer including at least a magnetic metal thin film is formed on a non-magnetic support by a vacuum evaporation process in which a magnetic metal material is deposited on said non-magnetic support, which is in continuous running, under supply of oxygen gas so as to have a coercive force Hc of 100 kA/m to 115 kA/m and a squareness ratio of 0.79 or larger, wherein:
- said non-magnetic support has a running speed of 150 m/min to 200 m/min.
Dependencies are inferred from the claim text.