Perpendicular magnetic recording medium and magnetic...

Details Perpendicular magnetic recording medium and magnetic... Perpendicular magnetic recording medium and magnetic...

2005-03-17

2008-10-07

Rickman, Holly (Department: 1794)

Stock material or miscellaneous articles

Magnetic recording component or stock

Thin film media

Reexamination Certificate

active

07431999

ABSTRACT:
Disclosed is a perpendicular magnetic recording medium including: a nonmagnetic substrate; a first underlayer formed on the nonmagnetic substrate, mainly composed of at least two kinds selected from a group consisting of Fe2O3, Co3O4, MgO, MoO3, Mn3O4, SiO2, Al2O3, TiO2, and ZrO2, and having crystal grains growing in a columnar shape and crystal grain boundaries surrounding the crystal grains; a nonmagnetic second underlayer formed on the first underlayer and having crystal grains with one of a face-centered cubic structure and a hexagonal close-packed structure growing on the crystal grains of the first underlayer; a magnetic layer formed on the second underlayer; and a protective film formed on the magnetic layer.

REFERENCES:
patent: 6468670 (2002-10-01), Ikeda et al.
patent: 6746749 (2004-06-01), Kirino et al.
patent: 6749955 (2004-06-01), Kirino et al.
patent: 2003/0064249 (2003-04-01), Uwazumi et al.
patent: 2003/0064253 (2003-04-01), Uwazumi et al.
patent: 2003/0152809 (2003-08-01), Oikawa et al.
patent: 2003/0157375 (2003-08-01), Uwazumi et al.
patent: 2004/0000374 (2004-01-01), Watanabe et al.
patent: 2004/0018391 (2004-01-01), Lee et al.
patent: 2004/0191466 (2004-09-01), Iwasaki et al.
patent: 2004/0224185 (2004-11-01), Nakamura et al.
patent: 10-182263 (1998-07-01), None
patent: 2001-134930 (2001-05-01), None
patent: 2001-256640 (2001-09-01), None
patent: 2002-163819 (2002-07-01), None
patent: 2003-036525 (2003-02-01), None
patent: 2003-228809 (2003-08-01), None
Chinese Patent Office, “Notification of First Office Action,” 3 pp. (Aug. 11, 2006).

Affiliated with

Also associated with

Rating

Perpendicular magnetic recording medium and magnetic... does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Perpendicular magnetic recording medium and magnetic..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Perpendicular magnetic recording medium and magnetic... will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3991207