Over-write capable magnetooptical recording medium having groove

Details Over-write capable magnetooptical recording medium having groove Over-write capable magnetooptical recording medium having groove

1992-03-09

1993-03-02

Nguyen, Hoa T.

Dynamic information storage or retrieval

Storage or retrieval by simultaneous application of diverse...

Magnetic field and light beam

369284, 369286, 369277, 3692752, G11B 1100, G11B 1304

Patent

active

051915642

ABSTRACT:
There is disclosed an over-write capable magnetooptical recording medium, which includes a substrate having spirally or concentrically formed land portions, and grooves formed between the adjacent land portions on its surface, and at least two layers including a memory layer having perpendicular magnetic anisotropy, and a writing layer exchange-coupled to the memory layer, and having perpendicular magnetic anisotropy, the stacking order of these layers not being specifically limited, characterized in that the depth of each of the grooves is set to be 800 .ANG. or less. The groove depth is preferably 300 .ANG. or more for tracking. Within this groove depth range, a C/N ratio can be higher than a case wherein a groove has a depth larger than 800 .ANG..

REFERENCES:
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patent: 4801499 (1989-01-01), Aoyama et al.
patent: 4910622 (1990-03-01), Saito et al.
patent: 5100741 (1992-03-01), Shimoda et al.
"Optronics," 1990, No. 4, pp. 227-231.
Swartz, R. G et al, "Stabilized Biasing of Semiconductor Lasers", The Bell System Technical Journal, vol. 62, (Sep. 1983) pp. 1923-1936.

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