Substrate for magnetic recording medium

Details Substrate for magnetic recording medium Substrate for magnetic recording medium

2007-07-10

2007-07-10

Castro, Angel (Department: 2627)

Dynamic magnetic information storage or retrieval

Record medium

Disk

C428S831000

Reexamination Certificate

active

10935519

ABSTRACT:
When a soft magnetic layer for a double layer type perpendicular magnetic recording medium is formed by a plating method, there is the problem of the occurrence of an isolated pulse noise called spike noise so that signal reproduction characteristics are lost. In order to solve this problem, provided are a surface-treated substrate for a magnetic recording medium comprising a substrate having a diameter of not more than 90 mm, and a soft magnetic plating layer comprising an alloy of at least two metals selected from the group consisting of Co, Ni and Fe, which is provided above the substrate, wherein the soft magnetic layer has a coercivity of less than 20 oersted (Oe) in a direction that is parallel to a substrate surface, and wherein a ratio of saturation magnetization to residual magnetization in a direction that is parallel to a surface of the substrate is from 4:1 to 4:3; and a magnetic recording medium comprising the magnetic recording medium substrate.

REFERENCES:
patent: 4746569 (1988-05-01), Takahashi et al.
patent: 4822634 (1989-04-01), Takahashi et al.
patent: 5006395 (1991-04-01), Hori et al.
patent: 5419938 (1995-05-01), Kagotani et al.
patent: 6251532 (2001-06-01), Futamoto et al.
patent: 6544672 (2003-04-01), Futamoto et al.
patent: 6548194 (2003-04-01), Hikosaka et al.
patent: 6627301 (2003-09-01), Shimizu et al.
patent: 6818331 (2004-11-01), Sakawaki et al.
patent: 6884519 (2005-04-01), Shimizu et al.
patent: 7038873 (2006-05-01), Shimazaki et al.
patent: 5-143972 (1993-06-01), None

Affiliated with

Also associated with

Rating

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

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

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3793560