Dynamic magnetic information storage or retrieval – Record medium – Disk
Patent
1978-04-03
1980-12-02
Wolff, John H.
Dynamic magnetic information storage or retrieval
Record medium
Disk
360131, 428900, 148105, G11B 582, H01F 1002
Patent
active
042375061
ABSTRACT:
An improved magnetic recording member of the disc type, the article of the invention is polymodal wherein one mode is formed of a first population of magnetic particles which have a coercivity differing by at least 200 oersteds from the coercivity of particles in another mode. These latter particles are, preferably, metallic magnetic particles oriented in a vertical direction and are in a thin layer over said first population of magnetic particles. This combination overcomes existing limitations on (a) disc products, and (b) the preferred metallic particles heretofore known.
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Cesari Robert A.
Graham Magnetics Inc.
Kehoe Andrew F.
McKenna John F.
Wolff John H.
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