Polymodal magnetic recording media process for making and...

Details Polymodal magnetic recording media process for making and... Polymodal magnetic recording media process for making and...

H - Electricity

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H01F 10/10 (2006.01) G06K 19/02 (2006.01) G06K 19/12 (2006.01) G11B 5/70 (2006.01) G11B 5/716 (2006.01) G11B 5/74 (2006.01) G11B 5/78 (2006.01) G11B 23/28 (2006.01) G11B 23/34 (2006.01) G11B 23/40 (2006.01)

Patent

CA 1079514

POLYMODAL MAGNETIC RECORDING MEDIA PROCESS FOR MAKING AND VERIFYING THE SAME AND COMPOSITIONS USEFUL THEREIN Abstract of the Disclosure: 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 or 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 populat- ions and processes making and using said media.

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