Magneto-optical recording medium, recording and playback method

Details Magneto-optical recording medium, recording and playback method Magneto-optical recording medium, recording and playback method

1994-11-23

1995-12-05

Neyzari, Ali

Dynamic information storage or retrieval

Storage or retrieval by simultaneous application of diverse...

Magnetic field and light beam

369 4426, 369 4437, 360 59, G11B 1304

Patent

active

054735831

ABSTRACT:
A magnetooptical recording medium having a higher recording density, improved bit error rate and superior weather resistance and a recording and playback method for the same are provided. The magnetooptical recording medium has a first magnetooptical layer having a high Curie temperature a second perpendicularly magnetizable magnetooptical layer having a low Curie temperature and a third perpendicularly magnetizable magnetooptical layer having an intermediate Curie temperature set between the Curie temperatures of the first and second magnetooptical layers, laminated in this order on a substrate. The first, second and third magnetooptical layers are formed respectively of amorphous alloys containing GdFeCo, TbFeTi and TbFeCoTi as the main component thereof. The first, second and third magnetooptical layers are exchange-coupled at 10.degree. C. to 90.degree. C., and the first and third magnetooptical layers are not magnetostatically coupled in the external magnetic field for reading use at the temperature at which the magnetization of the second magnetooptical layer is diminished.

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Patent Abstract of Japan, vol. 16, No. 35 of JP3242845, Jan. 28, 1992.
Patent Abstract of Japan, vol. 15, No. 322 of JP3116566, Aug. 16, 1991.

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