Method and apparatus for writing and reading a magneto-optical r

Details Method and apparatus for writing and reading a magneto-optical r Method and apparatus for writing and reading a magneto-optical r

1992-12-28

1994-12-06

Nguyen, Hoa T.

Dynamic information storage or retrieval

Storage or retrieval by simultaneous application of diverse...

Magnetic field and light beam

360114, G11B 1304

Patent

active

053717210

ABSTRACT:
A method and apparatus for writing and reading information in the form of a pattern of magnetic domains in an information layer of a record carrier. An optical scanning beam is focused to a diffraction-limited radiation spot, and a magnetic field is generated by a coil supplied with an energizing current the amplitude of which is modulated by the information signal to be recorded. The magnetic field is thereby modulated, and produces magnetic domains in the information layer such that each domain has a variable number of sub-domains and consequently a variable magnetization ratio, as determined by the information signal. This permits recording at an information density exceeding that corresponding to the size of the radiation spot.

REFERENCES:
patent: 4466004 (1984-08-01), Kobayashi et al.
patent: 4998231 (1991-03-01), Watanabe et al.
patent: 5014253 (1991-05-01), Morimoto et al.
patent: 5014254 (1991-05-01), Van Rosmalen et al.
patent: 5163031 (1992-11-01), Osato
Greindanus, Zeper, den Broeder, Godlieb and Carcia, Thermomagnetic Writing In Thin Co/Pt Layered Structures, Appl. Phys. Let. 54(24), Jun. 12, 1989, pp. 2481-2483.
Shieh and Kryder, Magneto-Optic Recording Materials With Direct Overwrite Capability, Appl. Phys. Lett. 49(8), Aug. 25, 1986, pp. 473-474.
Hartmann, Jacobs and Braat, Erasable Magneto-Optical Recording, Philips Technical Review vol. 42, No. 2, Aug. 1985, pp. 37-47.

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