Magneto-optical recording medium having a readout layer with var

Details Magneto-optical recording medium having a readout layer with var Magneto-optical recording medium having a readout layer with var

Filed on

1994-12-05

Date issued

1996-10-08

Examiner

Nelms, David C.

Patent Class

Dynamic information storage or retrieval

SubClass

Storage or retrieval by simultaneous application of diverse...

SubSubClass

Magnetic field and light beam

Other Related Categories

369 14, 3692752, 360 59, 365122, 428694MT, 428694RE, 428694EC, 428694GR, G11B 566

Type

Patent

Status

active

Patent number

055638520

Description

ABSTRACT:
A magneto-optical recording medium includes a readout layer has in-plane magnetization at room temperature and in which a transition occurs from in-plane magnetization to perpendicular magnetization when temperature thereof is raised, and a recording layer for recording thereon information. The composition of the readout layer varies in a direction perpendicular to the surface thereof, and in the readout layer, the Co density on the light incident side is higher than the Co density on the interface between the readout layer and the recording layer. Therefore, the Curie temperature on the reproducing light incident side of the readout layer is high and the the polar Kerr rotation angle in reproducing increases, thereby achieving improvements in a reproducing signal quality. On the other hand, since the Curie temperature on the interface is low, the shift of the threshold temperature at which a transition occurs from in-plane to perpendicular by the magnetic interaction between the layers can be suppressed, thereby achieving a high quality reproducing signal without changing the laser power required for reproduction very much.

REFERENCES:
patent: 4799114 (1989-01-01), Tsunashima
patent: 5248565 (1993-09-01), Tsutsumi et al.
patent: 5486395 (1996-01-01), Murakami et al.

Affiliated with

Also associated with

Rating

Magneto-optical recording medium having a readout layer with var does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Magneto-optical recording medium having a readout layer with var, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Magneto-optical recording medium having a readout layer with var will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-62551