Magnetic disk and magnetic disk manufacturing method

Details Magnetic disk and magnetic disk manufacturing method Magnetic disk and magnetic disk manufacturing method

2011-08-09

2011-08-09

McDonald, Rodney G (Department: 1724)

Chemistry: electrical and wave energy

Processes and products

Coating, forming or etching by sputtering

C427S129000, C427S130000, C427S131000, C427S132000

Reexamination Certificate

active

07993497

ABSTRACT:
In a magnetic disk having at least a glass substrate, a plurality of underlayers formed over the glass substrate, and a magnetic layer formed over the plurality of underlayers, at least one of the underlayers is an amorphous underlayer containing a VIa group element and carbon and, given that the remanent magnetization in a circumferential direction of the disk is Mrc and the remanent magnetization in a radial direction of the disk is Mrr, the magnetic disk has a magnetic anisotropy in which Mrc/Mrr being a ratio between Mrc and Mrr exceeds 1.

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