Marker with large barkhausen discontinuity

Details Marker with large barkhausen discontinuity Marker with large barkhausen discontinuity

G - Physics

08

B

G08B 13/14 (2006.01) G08B 13/24 (2006.01) H01F 1/03 (2006.01) H01F 1/04 (2006.01) H01F 1/153 (2006.01)

Patent

CA 2271020

A harmonic-type EAS marker (120) includes a wire segment (123) formed of cobalt alloy. To form the wire segment (123), the cobalt alloy is cast (30) as an amorphous wire, die-drawn (32) to a smaller diameter, and then annealed with application of longitudinal tension (34). The annealed wire is cut (36) to produce wire segments which have a magnetic hysteresis loop with a large Barkhausen discontinuity at a lower threshold level than has previously been achieved.

L'invention concerne un indicateur (120) du type harmonique de surveillance électronique d'articles, comprenant un segment (123) de fil formé d'un alliage de cobalt. Pour former ce segment (123) de fil, l'alliage de cobalt est coulé (30) sous forme de fil amorphe, découpé-étiré (32) à un diamètre inférieur, et ensuite recuit par application d'une tension (34) longitudinale. Le fil recuit est coupé (36) pour produire des segments de fil qui présentent une boucle d'hystérésis magnétique dotée d'une importante discontinuité due à l'effet Barkhausen à un seuil inférieur à celui qui avait été obtenu auparavant.

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