Signal reproducing apparatus utilizing displacement of magnetic

Details Signal reproducing apparatus utilizing displacement of magnetic Signal reproducing apparatus utilizing displacement of magnetic

1997-09-16

2000-03-21

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

060410248

ABSTRACT:
A signal reproducing apparatus reproduces a micro mark by causing a magnetic wall to be displaced on a magnetic recording medium. A partial temperature distribution is caused on the medium by a light beam irradiated thereon by using a heating device. A magnetization direction on the medium is detected by a reproducing circuit and a control circuit controls the heating device so as to form the temperature distribution such as to separate, in terms of time, a timing of the occurrence of a first magnetic wall displacement from the front side of a temperature peak position in the temperature distribution toward the temperature peak position and a timing of the occurrence of a second magnetic wall displacement from the backside of the temperature peak position toward the temperature peak position.

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