Stock material or miscellaneous articles – Composite – Of inorganic material
Reexamination Certificate
2005-08-02
2005-08-02
Rickman, Holly (Department: 1773)
Stock material or miscellaneous articles
Composite
Of inorganic material
C428S692100, C428S900000
Reexamination Certificate
active
06924048
ABSTRACT:
A magnetic storage device has a magnetic layer, the magnetic crystal grains of which are separated by a nonmagnetic phase. The typical crystal grain is in the approximate shape of a sphere or an ellipsoid. The thickness of the magnetic crystal grains, which is in the direction perpendicular to the surface or the film, is smaller than that of the thickness of the magnetic film. The ratio of the coercive force, which is measured in the circumferential direction, to the coercive force, which is measured in the radial direction, (the orientation ratio of the coercive force), is larger than 1.0, but preferably nor greater than 3.0. Further, the area fraction of the magnetic grains having an extended axis within 30° from the circumferential direction is equal to or more than 45%.
REFERENCES:
patent: 4042341 (1977-08-01), Smeggil
patent: 5478661 (1995-12-01), Murayama et al.
patent: 5989674 (1999-11-01), Marinero et al.
patent: 6156404 (2000-12-01), Ross et al.
patent: 6221508 (2001-04-01), Kanbe et al.
patent: 4-153910 (1992-05-01), None
patent: 05-325164 (1992-05-01), None
patent: 7-073441 (1995-03-01), None
patent: 7-098835 (1995-04-01), None
patent: 08-083418 (1995-07-01), None
patent: 7-311929 (1995-11-01), None
patent: 8-045073 (1996-02-01), None
patent: 10-003638 (1996-06-01), None
K. Ichihara et al, “High-Density Recording Capability of Granular Media Composed of CO-Pt Grains and SiO2 Matrix,” IEEE Transactions on Magnetics, vol. 34, No. 4, Jul. 1998, pp. 1603-1605.
Applied Physics Letters, vol. 52, No. 6, Feb. 8, 1988, “Granular Metal Films as Recording Media”, S. Liou et al, pp. 512-514.
Hosoe Yuzuru
Kanbe Tetsuya
Matsunuma Satoshi
Shiroishi Yoshihiro
Takahashi Yoshio
Mattingly ,Stanger ,Malur & Brundidge, P.C.
Rickman Holly
LandOfFree
Magnetic recording medium and a magnetic storage apparatus does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Magnetic recording medium and a magnetic storage apparatus, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Magnetic recording medium and a magnetic storage apparatus will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3513726