Multi-layer thin-film eas marker

Details Multi-layer thin-film eas marker Multi-layer thin-film eas marker

G - Physics

08

B

G08B 13/22 (2006.01) G08B 13/24 (2006.01)

Patent

CA 2041581

A marker for use in magnetic-type electronic article surveillance systems, comprising a substrate on which are deposited a plurality of high permeability, low coercive force magnetic thin-films, each being separated from an adjacent magnetic thin-film by a non-magnetic thin-film. Each of the magnetic films have substantially the same permeability and coercive force, and the non-magnetic films are of a thickness to allow magnetostatic coupling while inhibiting exchange coupling. Accordingly, all of the magnetic thin-films reverse as a single entity and produce a sharp, readily distinguishable response.

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