Document identification employing exchange-anisotropic magnetic

Details Document identification employing exchange-anisotropic magnetic Document identification employing exchange-anisotropic magnetic

1980-12-03

1984-03-20

Canney, Vincent P.

Dynamic magnetic information storage or retrieval

Recording on or reproducing from an element of diverse utility

Card

235493, G11B 2504

Patent

active

044384629

ABSTRACT:
A process for authenticating recording media which are to be safeguarded against falsification and which possess a layer of exchange-anisotropic magnetic material, by determining the residual recording which is left over, because of the exchange anisotropy of the magnetic material, from a recording of a sequence of signals after exposure of the material to a specific temperature cycle and, subsequently, to a magnetic AC field which decreases to zero, and an apparatus for carrying out the said process.

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patent: 3599153 (1971-08-01), Lewis et al.
patent: 3883892 (1975-05-01), Kneller
patent: 3946206 (1976-03-01), Darjany
patent: 3959032 (1976-05-01), Koester et al.
patent: 3961990 (1976-06-01), Koester et al.

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