| 摘要 |
A magnetomechanical marker for use in an electronic article surveillance system comprising a magnetomechanical element, a bias magnet and a housing. The magnetomechanical element comprises first and second resonator strips composed of an unannealed magnetostrictive amorphous metal alloy having a resonant frequency response including a resonant frequency minimum in response to the incidence thereon of an electromagnetic interrogating field. The bias magnet has a bias point to magnetically bias the magnetomechanical element so that the magnetomechanical element resonates at a predetermined frequency in the presence of an electromagnetic interrogating field. The housing has a cavity sized and shaped to accommodate the first and second resonator strips positioned in the cavity in registration and to allow the first and second resonator strips to mechanically vibrate, wherein the first resonator strip has a first weight and first shape and is positioned proximate the second resonator strip so that the first weight and the first shape mechanically interfere with the second resonator strip to impart a stress on the second resonator strip which shifts the resonant frequency minimum to the bias point.
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