Magnetic recording medium and method of producing the same

Stock material or miscellaneous articles – Magnetic recording component or stock – Thin film media

Reexamination Certificate

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Reexamination Certificate

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10271172

ABSTRACT:
A magnetic recording medium having high C/N ratio characteristics particularly in a short wavelength range and capable of attaining a further higher-density recording as a magnetic recording tape produced by forming a magnetic layer by a vapor deposition method and other magnetic recording media of the next generation and a method of producing the same, wherein a magnetic layer is formed by a vapor deposition method on a nonmagnetic supporting body made of a polymer substrate, which has a configuration of comprising a nonmagnetic supporting body, an under layer formed on the nonmagnetic supporting body, containing Co and O and having an atomic ratio of O/Co of 0.4 or more and a magnetic layer containing Co and O, wherein the film thickness of the under layer is made 50 nm or less and the maximum incident angle is made 70° or less in the vapor deposition method.

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patent: 4900622 (1990-02-01), Nakayama et al.
patent: 5472506 (1995-12-01), Tohma et al.
patent: 5942342 (1999-08-01), Hikosaka et al.
patent: 6652998 (2003-11-01), Segawa et al.
patent: 6746749 (2004-06-01), Kirino et al.

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