Magneto-optical recording medium and writing and readout method

Details Magneto-optical recording medium and writing and readout method Magneto-optical recording medium and writing and readout method

1998-07-27

1999-10-19

Dinh, Tan

Dynamic information storage or retrieval

Storage or retrieval by simultaneous application of diverse...

Magnetic field and light beam

G11B 1100

Patent

active

059700270

ABSTRACT:
A magneto-optical recording medium having a writing layer formed on a transparent substrate provided with a groove having a flat bottom surface and a flat land, so that writing or readout is carried out on either the groove or the land only by irradiating a laser beam from the substrate side, wherein the sum (.alpha.+.beta.) of a phase shift .alpha. of a reflected light of a readout beam by the substrate and a phase shift .beta. thereof by a layer structure on the transparent substrate, is made to have an opposite sign to a phase shift .gamma. by interference of reflected lights from the groove and the land.

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patent: 5852591 (1998-12-01), Fukumoto
Kyuya Narita, et al, "Feasibility Study of High Density Land/Groove Recording on Magnetooptical Disks", Jpn. J. Appl. Phys., vol. 36, Part 1, No. 1B, Jan. 1997, pp. 495-499.

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