Magnetooptical recording medium having magnetic layers that sati

Details Magnetooptical recording medium having magnetic layers that sati Magnetooptical recording medium having magnetic layers that sati

1994-07-27

1997-01-21

Dinh, Tan

Dynamic information storage or retrieval

Storage or retrieval by simultaneous application of diverse...

Magnetic field and light beam

360 59, 428694ML, G11B 1100

Patent

active

055965555

ABSTRACT:
A magnetooptical recording medium has first and second magnetic layers laminated in that order on a transparent substrate on which a received laser beam is incident. The coercive force of the second magnetic layer is greater than that of the first magnetic layer and is greater than .sigma..sub.w /2M.sub.s2 h.sub.2, where .sigma..sub.w is the magnetic wall energy between the first and second magnetic layers, M.sub.s2 is the saturation magnetization of the second magnetic layer, and h.sub.2 is the film thickness of the second magnetic layer. The coercive force of the first magnetic layer is greater that .sigma..sub.w /2M.sub.s1 h.sub.1, where M.sub.s1 is the saturation magnetization of the first magnetic layer and h.sub.1 is the film thickness of the first magnetic layer. The compensation temperature of the first magnetic layer is smaller than the Curie temperature of the first magnetic layer. Recording is performed by selectively applying a laser spot, having either a high power or a low power.

REFERENCES:
patent: 5132945 (1992-07-01), Osato et al.
patent: 5163031 (1992-11-01), Osato
patent: 5210724 (1993-05-01), Kobayashi
patent: 5265073 (1993-11-01), Osato
patent: 5325345 (1994-06-01), Shimokawato et al.
patent: 5420833 (1995-05-01), Tanaka et al.
patent: 5440531 (1995-08-01), Sato et al.

Affiliated with

Also associated with

Rating

Magnetooptical recording medium having magnetic layers that sati does not yet have a rating. At this time, there are no reviews or comments for this patent.

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

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2329784