Dual status thin-film eas marker having multiple magnetic layers

Details Dual status thin-film eas marker having multiple magnetic layers Dual status thin-film eas marker having multiple magnetic layers

1995-01-04

1996-12-03

Ryan, Patrick

Stock material or miscellaneous articles

Composite

Of metal

428900, 428611, 428621, 340551, 340572, B32B 900

Patent

active

055806643

ABSTRACT:
A dual status marker for use with a magnetic-type EAS system has a signal-producing layer including at least one magnetic thin-film of high permeability and low coercive force such as permalloy, and a signal-blocking layer including at least one remanently magnetizable thin-film such as an Fe-Cr alloy. The remanently magnetizable thin-film or thin-films should have a total thickness at least equal to, and preferably at least twice, the total thickness of the magnetic thin-film or thin-films of high permeability. By doing so, the marker is more reliably deactivated when the signal-blocking layer is magnetized. For even greater assurance of deactivation, the signal-blocking layer should include more than one remanently magnetizable thin-film, thus giving it a squarer B-H loop and greater assurance against false alarms.

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