Perpendicular magnetic recording medium

Details Perpendicular magnetic recording medium Perpendicular magnetic recording medium

2011-08-09

2011-08-09

Bernatz, Kevin M (Department: 1785)

Stock material or miscellaneous articles

Magnetic recording component or stock

Thin film media

C428S831200, C428S836200

Reexamination Certificate

active

07993765

ABSTRACT:
In a perpendicular magnetic recording medium which includes a substrate (1) of a nonmagnetic material, first and second nonmagnetic underlayers (4and5) formed on the substrate, and a perpendicular magnetic recording layer (6) formed on the first and the second nonmagnetic underlayers, the first nonmagnetic underlayer is made of an amorphous nonmagnetic metal material containing a metal element which forms a face-centered cubic (fcc) crystal structure by a simple substance. The second nonmagnetic underlayer is formed on the first nonmagnetic underlayer in contact with the first nonmagnetic underlayer and made of a nonmagnetic material containing a hexagonal close packed structure. The perpendicular magnetic recording layer is formed on the second nonmagnetic underlayer in contact with the second nonmagnetic layer.

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