Magnetic materials for security applications

Details Magnetic materials for security applications Magnetic materials for security applications

1993-04-09

1994-11-29

Lewis, Michael

Stock material or miscellaneous articles

All metal or with adjacent metals

Having magnetic properties, or preformed fiber orientation...

340551, 340572, 428601, G08B 1324, B32B 300

Patent

active

053689488

ABSTRACT:
A tag or marker is disclosed which comprises a substrate; an `active` magnetic material which is a soft magnetic material having a high magnetic permeability and a low coercive force; and a deactivating material which is a hard or semi-hard magnetic material having a moderate or high coercive force and a moderate magnetic permeability, whereby the deactivating material, when subjected to a sufficiently high magnetising force, is able to clamp the magnetic properties of the `active` material so as to deactivate the `active` material. The tag or marker is characterised in that the deactivating material is formed by an electrodeposition process, and in that the deactivating layer is nickel.

REFERENCES:
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patent: 4495487 (1985-01-01), Kavesh et al.
patent: 4636448 (1987-01-01), Morita et al.
patent: 4743890 (1988-05-01), Hilzinger et al.
patent: 5175499 (1992-12-01), Davies
Roger Grant & Claire Grant; Chemical Dictionary; 1987; p. 433.
Bozorth, Ferromagnetism, 1951 pp. 108-111, 124-125.

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