Particulate magnetic recording media having an areally controlle

Details Particulate magnetic recording media having an areally controlle Particulate magnetic recording media having an areally controlle

1986-10-29

1989-02-14

Tupper, Robert S.

Dynamic magnetic information storage or retrieval

Record medium

Disk

360131, G11B 582

Patent

active

048050652

ABSTRACT:
Utilizing the technique whereby particulate media electrodeposited at a critical electric field intensity has a given packing density, and when electrodeposited at a lesser electric field intensity has a lower density, the present invention teaches electrodeposition of media whose particulate packing density varies in accordance with an areally predetermined pattern. The pattern is incised in one electrode of the deposition apparatus, and the medium as deposited on the other electrode mirrors the pattern as a varying particulate packing density. The packing density varies with the electric field intensity, and the electric field varies due to the unequal interelectrode distances arising from the incisions in the electrode. The medium is then d.c. magnetized, and the density variation provides a magnetically reproducible signal in accordance with the pattern.

REFERENCES:
patent: 4333961 (1982-06-01), Bruce et al.
patent: 4451495 (1984-05-01), Homola et al.
patent: 4578280 (1986-03-01), Greiner et al.
patent: 4585535 (1986-04-01), Sher et al.
patent: 4650708 (1987-03-01), Takahashi
IBM Technical Disclosure Bulletin, vol. 20, No. 4, Sep. 1977, Multilayer Magnetic Recording Media, Bruce et al.

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