Magnetic recording using recording media having temperature depe

Details Magnetic recording using recording media having temperature depe Magnetic recording using recording media having temperature depe

1979-05-14

1981-07-07

Wolff, John H.

Dynamic magnetic information storage or retrieval

Record copying

Contact transfer

360 17, 360131, G11B 586

Patent

active

042778069

ABSTRACT:
A magnetic recording which is useful as a mirror image duplication video tape master is made from another magnetic recording by anhysteretic transfer at a temperature at which the coercive force of the master is much less than the coercive force of the other recording. Preferably, the magnetic recording layer of the master comprises fine particles of a manganese bismuth alloy, the coercivity of which decreases with decreasing temperature, and the other record comprises a magnetic recording layer having a coercivity which increases with decreasing temperature. The master record may subsequently be used to duplicate copies of the recording by anhysteretic transfer to a copy record having a coercive force which, at the temperature at which the transfer is made (typically room temperature), is substantially lower than the coercive force of the master.

REFERENCES:
patent: 3827077 (1974-07-01), Kobilka
patent: 3913131 (1975-10-01), Kitamoto et al.
patent: 3921208 (1975-11-01), Chapman

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