High-density magneto-optic disk and method of manufacturing the

Details High-density magneto-optic disk and method of manufacturing the High-density magneto-optic disk and method of manufacturing the

1994-09-20

1998-05-05

Kiliman, Leszek

Stock material or miscellaneous articles

Circular sheet or circular blank

Recording medium or carrier

428694GT, 428694MM, 428694EC, 428694RL, 428900, 369283, 360135, G11B 566

Patent

active

057471363

ABSTRACT:
A magneto-optic disk has a readout layer formed of a bismuth-substituted garnet having a chemical composition represented by Bi.sub.x R.sub.3-x M.sub.y Fe.sub.5-y O.sub.12 and a recording layer formed of a nonbismuth-substituted garnet having a chemical composition represented by R.sub.3 M, Fe.sub.5-z O.sub.12 (where 0.ltoreq.x.ltoreq.3, 0.ltoreq.y<2, 0.ltoreq.z<2, R represents yttrium or a rare earth element, and M represents element which can be substituted for iron (Fe). The readout layer has a smaller coercive force and a higher Curie temperature in comparison with the recording layer, and exhibits a characteristic of a large angle of Faraday rotation 200 times that of the recording layer with respect to a short-wavelength laser beam of about 500 nm. Therefore, the MSR technique utilizing masking of the recording layer with the readout layer can be applied to this magneto-optic disk to achieve a high recording density about 16 times that in the case of a magneto-optic disk having an amorphous alloy thin film formed of a rare earth element and a transition metal and effective with respect to a laser beam of a comparatively long wavelength about 800 nm.

REFERENCES:
patent: 4628485 (1986-12-01), Tanaka et al.
patent: 4701881 (1987-10-01), Tanaka et al.
Suzuki et al "Magnetic and MO Properties of Bi-Substituted Garnet Films Crystallized by Rapid Thermal Processing" (Abstract) 1989.
Abe et al "MO Recording on Garnet Films" J. Mag. and Magnetic Materials 84(1990) pp. 222-228.
M. Kaneko et al., "Multilayered Magneto-Optical Disks for Magnetically Induced Superresolution", Proc. Int. Symp. on Optical Memory, pp. 203-210, (1991).
K. Shono et al., "Magneto-Optical Recording of Sputtered Garnet Films Crystallized During Deposition", Mat. Res. Soc. Symp. Proc., vol. 150, pp. 131-135, (1989).
H. Kano et al., "Optimized Structure of Sputtered Garnet Disks", IEEE Transactions on Magnetics, vol. 25, pp. 3737-3742 (1989).
K. Shono et al., "Magneto-Optical Recording of Sputtered Garnet Films Using Laser Diode", IEEE Transactions on Magnetics, vol. Mag-23, pp. 2970-2972, (1987).

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