Magnetostrictive element having optimized bias-field-dependent resonant frequency characteristic

  • US 5,949,334 A
  • Filed: 02/14/1997
  • Issued: 09/07/1999
  • Est. Priority Date: 10/02/1995
  • Status: Expired due to Term
First Claim
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1. A magnetomechanical electronic article surveillance marker comprising:

  • a magnetostrictive element for use as an active element in said marker;

    said element being a strip of amorphous metal alloy, said element having been annealed so as to relieve stress in said element, said element having a resonant frequency that varies according to a level of a bias magnetic field applied to said element and having a bias-field-dependent resonant frequency characteristic such that the resonant frequency of said element varies by a total of no more than 800 Hz as the bias field applied to said element varies in the range of 4 Oe to 8 Oe.

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