Magnetic recording medium and method for manufacturing the same

Details Magnetic recording medium and method for manufacturing the same Magnetic recording medium and method for manufacturing the same

2005-05-31

2005-05-31

Rickman, Holly (Department: 1773)

Stock material or miscellaneous articles

Composite

Of inorganic material

C428S690000, C428S611000, C428S900000

Reexamination Certificate

active

06899964

ABSTRACT:
A magnetic recording medium, and method of manufacturing the same, is provided with excellent recording performance by employing a granular magnetic layer having a specified composition. A magnetic recording medium according to the present invention comprises a nonmagnetic underlayer, a granular magnetic layer, a protective film, and a liquid lubrication layer sequentially laminated on a nonmagnetic substrate. The granular magnetic layer consists of ferromagnetic crystal grains containing cobalt and nonmagnetic grain boundary region surrounding the ferromagnetic crystal grains. The ferromagnetic crystal grains contain platinum in the range of 15 at % to 17 at %.

REFERENCES:
patent: 5679473 (1997-10-01), Murayama et al.
patent: 6420058 (2002-07-01), Haratani et al.
patent: 6620532 (2003-09-01), Aoyama
patent: 6689495 (2004-02-01), Sato et al.
patent: 2000-322726 (2000-11-01), None

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