Magnetic materials for security applications

Details Magnetic materials for security applications Magnetic materials for security applications

1994-09-12

1996-12-10

Simmons, David A.

Stock material or miscellaneous articles

All metal or with adjacent metals

Having magnetic properties, or preformed fiber orientation...

428928, 428935, 428936, 428679, 340572, 340551, G08B 1324

Patent

active

055829244

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 deactivating material in the tag or marker is electrodeposited nickel with a planar crystal grain structure.

REFERENCES:
patent: 3378357 (1968-04-01), Alban
patent: 4439294 (1984-03-01), Bril et al.
patent: 4495487 (1985-01-01), Kavesh et al.
patent: 4636448 (1987-01-01), Morita et al.
patent: 4743890 (1988-05-01), Hilzinger et al.
Lowenheim, "Modern Electroplating", 1964, pp. 698-708 and 260-305.
"Metals Handbook" Ninth Edition, 1983, pp. 223-243.
The Properties of Electrodeposited Metals and Alloys, American Electroplaters and Surface Finishers Societ, by William H. Safranek, Second Edition (Jun. 4, 1987).
Roger Grant & Claire Grant; Chemical Dictionary; 1987, p. 433.
Bozorth, Ferromagnetism, 1951, pp. 108-111, 124-125.

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