IP Library › Granted Patent US 7,316,852
Granted Patent B2
US 7,316,852 · App. 10/936,562 · Granted Jan 8, 2008

Perpendicular magnetic recording media

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Quick Facts
Patent No.
US 7,316,852
App. No.
10/936,562
Granted
Jan 8, 2008
Kind
B2
Abstract

There is provided a perpendicular magnetic recording medium comprising a non-magnetic layer having a face-centered cubic structure, an antiferromagnetic layer provided on the non-magnetic layer, a soft magnetic underlayer provided on the antiferromagnetic layer, and a perpendicular recording layer provided on the soft magnetic underlayer, which magnetic recording medium makes it possible to realize a recording density not less than 50 Gb/in 2 and makes the error rate thereof low while suppressing the spike noise.

Claims (3)

1. A perpendicular magnetic recording medium comprising an antiferromagnetic layer, a crystalline ferromagnetic layer provided directly on the antiferromagnetic layer, a soft magnetic underlayer provided directly on the crystalline ferromagnetic layer, and a perpendicular recording layer provided above the soft magnetic underlayer,

wherein said crystalline ferromagnetic layer has a bcc structure and said soft magnetic underlayer has a uni-axial magnetic anisotropy and a unidirectional magnetic anisotropy, and

wherein said crystalline ferromagnetic layer has a thickness not less than 1 nm but not more than 10 nm.

Assignments (1)
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Mar 10, 2006
From: HITACHI, LTD.
To: HITACHI GLOBAL STORAGE TECHNOLOGIES JAPAN, LTD.
Reel/Frame 017331/0825 →