Stock material or miscellaneous articles – Magnetic recording component or stock – Thin film media
Reexamination Certificate
2005-09-27
2010-12-07
McNeil, Jennifer C (Department: 1784)
Stock material or miscellaneous articles
Magnetic recording component or stock
Thin film media
C428S836100, C428S836300, C428S332000, C428S336000, C428S690000, C428S900000, C428S611000, C428S678000, C428S610000
Reexamination Certificate
active
07846564
ABSTRACT:
A perpendicular magnetic recording medium adapted for high recording density and high data recording rate comprises a non-magnetic substrate having at least one surface with a layer stack formed thereon, the layer stack including a perpendicular recording layer containing a plurality of columnar-shaped magnetic grains extending perpendicularly to the substrate surface for a length, with a first end distal the surface and a second end proximal the surface, wherein each of the magnetic grains has: (1) a gradient of perpendicular magnetic anisotropy field Hk extending along its length between the first end and second ends; and (2) predetermined local exchange coupling strengths along the length.
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Gao Kaizhong
Li Shaoping
Wang Lei
Wang Xiaobin
Zhu Wenzhong
Hollingsworth & Funk LLC
Katz Vera
McNeil Jennifer C
Seagate Technology LLC
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