Magnetic recording medium

Stock material or miscellaneous articles – Web or sheet containing structurally defined element or... – Including a second component containing structurally defined...

Patent

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

428694, 428900, G11B 2300

Patent

active

050513036

ABSTRACT:
A magnetic recording medium is disclosed, comprising a nonmagnetic support having thereon plural magnetic layers comprising ferromagnetic particles dispersed in a binder, said ferromagnetic particles consisting of an iron oxide or a cobalt-containing iron oxide, said plural magnetic layers comprising at least an upper magnetic layer and a lower magnetic layer, wherein said upper magnetic layer has a coercive force (Hc) of from 650 to 1000 Oe, a crystallite size of the ferromagnetic particles contained in said upper magnetic layer is less than 500 .ANG. as measured by a X-ray diffraction method, an average length in the long axis of the ferromagnetic particles contained in said upper magnetic layer is from 0.1 microns to less than 0.25 microns as measured by a transmission type electronmicroscope, said lower magnetic layer has a coercive force (Hc) of from 0.6 to 1.0 times that of said upper magnetic layer, a crystallite size of the ferromagnetic particles contained in said lower magnetic layer is larger than that of said upper magnetic layer and is in the range of 500 .ANG. or less, and an average length in the long axis of the ferromagnetic particles contained in said lower magnetic layer is larger than that of said upper magnetic layer and is in the range of from more than 0.1 microns to less than 0.25 microns.

REFERENCES:
patent: 4410590 (1983-10-01), Kawahara et al.
patent: 4624883 (1986-11-01), Yamaguchi et al.
patent: 4689263 (1987-08-01), Kambe et al.
patent: 4784895 (1988-11-01), Mizuno et al.
patent: 4847147 (1989-07-01), Aonuma et al.
patent: 4851289 (1989-07-01), Ogawa et al.

LandOfFree

Say what you really think

Search LandOfFree.com for the USA inventors and patents. Rate them and share your experience with other people.

Rating

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

Rate now

     

Profile ID: LFUS-PAI-O-1695788

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.