Multi-layer thin-film EAS marker
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United States of America Patent
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Jan 21, 1992
Grant Date -
N/A
app pub date -
Jun 1, 1990
filing date -
Jun 1, 1990
priority date (Note) -
Expired
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Abstract
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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