Method for reproducing information data recorded on a magneto-op

Details Method for reproducing information data recorded on a magneto-op Method for reproducing information data recorded on a magneto-op

1996-01-24

1997-04-22

Dinh, Tan

Dynamic information storage or retrieval

Storage or retrieval by simultaneous application of diverse...

Magnetic field and light beam

369116, G11B 1100

Patent

active

056234589

ABSTRACT:
A method for reproducing information recorded on a magneto-optical recording medium that includes a transparent substrate, a first magnetic layer laminated on the transparent substrate, a second magnetic layer laminated on the first magnetic layer, and a third magnetic layer laminated on the second magnetic layer. The first magnetic layer has an easy axis of magnetization in a plane at room temperature. The second and third magnetic layers have an easy axis of magnetization perpendicular to the substrate. When a laser beam is directed onto the medium a temperature distribution is formed in the laser beam spot. The temperature distribution includes a first area where the direction of magnetization of the first magnetic layer in an in-plane direction, a second area where the magnetization of the third magnetic layer is transferred to the second and the first magnetic layers by exchange bond, and a third area where the temperature of the second magnetic layer is higher than its Curie temperature.

REFERENCES:
patent: 5367509 (1994-11-01), Fukumoto et al.
patent: 5481410 (1996-01-01), Osato et al.
patent: 5486395 (1996-01-01), Murakami et al.
patent: 5539709 (1996-07-01), Sato et al.

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