Magnetic recording medium and manufacturing method thereof

Details Magnetic recording medium and manufacturing method thereof Magnetic recording medium and manufacturing method thereof

2007-02-27

2007-02-27

Rickman, Holly (Department: 1773)

Stock material or miscellaneous articles

Magnetic recording component or stock

Thin film media

C427S131000

Reexamination Certificate

active

10764813

ABSTRACT:
A nonmagnetic foundation layer is made to have a body-centered cubic crystal structure with a preferred crystal orientation plane being the bcc (110) plane. A nonmagnetic intermediate layer, provided between the foundation layer and a granular magnetic layer, has a hexagonal close-packed structure with the hcp (100) plane or the hcp (200) plane being the preferred orientation plane. Furthermore, the crystal lattice misfit amount between the nonmagnetic intermediate layer3and the granular magnetic layer is made to be not more than 10% for each of an a-axis and a c-axis. As a result, epitaxial growth of ferromagnetic crystals in the granular magnetic layer, which has an hcp structure, is promoted, and hence the crystallinity of the magnetic layer is increased, and thus it becomes possible to simultaneously realize an increase in coercivity and a reduction in noise. Depositing the layers on an unheated substrate yields reduces manufacturing costs.

REFERENCES:
patent: 5679473 (1997-10-01), Murayama et al.
patent: 6110582 (2000-08-01), Wu et al.
patent: 6162526 (2000-12-01), Kobayashi
patent: 6221481 (2001-04-01), Wu et al.
patent: 6379775 (2002-04-01), Kobayashi
patent: 6403240 (2002-06-01), Kanbe et al.
patent: 6936352 (2005-08-01), Ohsawa et al.
patent: 8-255342 (1996-10-01), None
patent: 2000-276729 (2000-10-01), None
patent: 2001-101651 (2001-04-01), None
patent: 2002-15417 (2002-01-01), None
Machine translation of JP 2002-015417, Uwazumi et al., Jan. 18, 2002.
Relevant portion of Search Report (6 pages) and Written Opinion (9 pages) dated Oct. 14, 2005, issued in SG 200307529-8 by the Intellectual Property Office of Singapore.

Affiliated with

Also associated with

Rating

Magnetic recording medium and manufacturing method thereof does not yet have a rating. At this time, there are no reviews or comments for this patent.

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

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3842168