Polymodal magnetic recording media and compositions useful there

Details Polymodal magnetic recording media and compositions useful there Polymodal magnetic recording media and compositions useful there

1977-12-12

1981-07-28

Pianalto, Bernard D.

Stock material or miscellaneous articles

Composite

Of metal

252 6254, 252 6255, 252 6256, 428900, 428694, B22F 300, C04B 3564, H01F 104, H01F 114

Patent

active

042810434

ABSTRACT:
Polymodal magnetic information-recording articles formed with at least two different populations of magnetic powders, whereby at least one of the powders, being of lower intrinsic coercivity and forming means to accept a noise interference pattern, accepts a pattern which serves as a means to verify the authenticity of, or means to detect previous tampering with, the magnetic recording device. More generally, the disclosure relates to polymodal recording media characterized by incorporation of a plurality of independently-erasable ferromagnetic powder populations and processes for making and using said media. Particular advantage is disclosed for such media having a relatively small ratio of coercivity between easier and harder axis and for material wherein shape anisotropy is absent from adjacent modes in a polymodal system.

REFERENCES:
patent: 3219353 (1965-11-01), Prentky
patent: 3328195 (1967-06-01), May
patent: 3413141 (1968-11-01), Friedman
patent: 3566356 (1971-02-01), Holm
patent: 3627580 (1971-12-01), Krall
patent: 3653962 (1972-04-01), Akashi et al.
patent: 3681138 (1972-08-01), Ankenbrand et al.
patent: 3986205 (1976-10-01), Fayling

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