Method of producing a magnetic recording medium and a...

Details Method of producing a magnetic recording medium and a... Method of producing a magnetic recording medium and a...

2006-12-19

2006-12-19

Haran, John T. (Department: 1733)

Coating processes

Electrical product produced

Metallic compound coating

C427S128000, C427S129000, C427S132000, C428S846000

Reexamination Certificate

active

07150895

ABSTRACT:
A perpendicular magnetic recording medium has a magnetic recording layer with ferromagnetic crystalline grains and nonmagnetic and nonmetallic grain boundary region surrounding the grains. The surface of its underlayer, before forming the magnetic recording layer, is exposed to an O2or N2atmosphere or an atmosphere of rare gas and O2or N2, to attach the O2or N2as nucleation sites for promoting growth of the nonmagnetic and nonmetallic region. By forming the magnetic recording layer thereafter, both ferromagnetic crystalline grains and the nonmagnetic and nonmetallic grain boundary region are formed from the initial stage of the growth of the magnetic recording layer. Thus, a magnetic recording layer having excellent segregation structure can be formed.

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