Dynamic information storage or retrieval – Storage or retrieval by simultaneous application of diverse... – Magnetic field and light beam
Patent
1996-12-13
1998-07-28
Neyzari, Ali
Dynamic information storage or retrieval
Storage or retrieval by simultaneous application of diverse...
Magnetic field and light beam
428694ML, 428694EC, G11B 1100, G11B 566
Patent
active
057870560
ABSTRACT:
If the Curie points of the first magnetic layer, second magnetic layer, third magnetic layer and fourth magnetic layer of alloys of rare-earth metal and transition metal as ferrimagnetic materials showing perpendicular magnetization from room temperature to their Curie points are indicated as Tc1, Tc2, Tc3 and Tc4, respectively, the Curie points and room temperature are related by: room temperature<Tc3<Tc4<Tc1<Tc2. If the sublattice magnetization of transition metal is indicated as .alpha. and the sublattice magnetization of rare-earth metal is .beta., .alpha. is stronger than .beta. in the second magnetic layer at temperatures between Tc1 and Tc2, and .beta. is stronger than .alpha. in the fourth magnetic layer at temperatures between room temperature and Tc4. This structure enables light-intensity modulation overwriting, eliminates the necessity of orienting the magnetization of magnetic layers in one direction using a great magnetic field or high laser power before shipment from factories or before recording, and reduces an increase in the cost of manufacturing a magneto-optical recording medium and a device for recording information on the magneto-optical medium.
REFERENCES:
patent: 5164926 (1992-11-01), Matsumoto
patent: 5208797 (1993-05-01), Nakaki et al.
patent: 5596555 (1997-01-01), Osato et al.
patent: 5604046 (1997-02-01), Osato
patent: 5627803 (1997-05-01), Negishi
J. Nakayama, et al., "Magneto-optical Recording Medium and Magneto-optical Recording Method", Japanese Unexamined Patent Application No. Tokukaihei 7-161082, Jun. 23, 1995.
J. Nakayama, et al., "Direct Overwriting Using Magnetooptical Trilayer Medium and One Magnet", Jpn J. Appl. Phys. vol. 32, Part 1, No. 11B, pp. 5439-5440, Nov. 1993.
Hirokane Junji
Mieda Michinobu
Nakayama Junichiro
Takahashi Akira
Conlin David C.
Daley, Jr. William J.
Neyzari Ali
Sharp Kabushiki Kaisha
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