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A magnetomechanical marker having an amorphous portion annealed in the presence of a transverse magnetic field for use in an electronic article surveillance system and manufacturing method therefor
A magnetomechanical marker having an amorphous portion annealed in the presence of a transverse magnetic field for use in an electronic article surveillance system and manufacturing method therefor
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机译:用于电子物品监视系统的具有在横向磁场中退火的非晶部分的磁机械标记及其制造方法
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摘要
A marker for use in a magneto-mechanical electronic article surveillance (EAS) system comprises an amorphous magneto-restrictive strip (12) formed of a Fe-Co alloy contg. at least 30 at. % Co. Also claimed are: (i) a method of making this marker comprising mounting the strip near a biasing element (16) providing a dc magnetic biasing field so that the element has a resonant frequency; (ii) an EAS system using the above comprising a means of generating an alternating e.m. field including an interrogation coil in an interrogation zone and the marker above secured to an article for passage through the zone, along with biasing element. A detector detects the resonance of the element in the alternating field.
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