Amorphous magnetostrictive alloy and an electronic article surve

Details Amorphous magnetostrictive alloy and an electronic article surve Amorphous magnetostrictive alloy and an electronic article surve

1997-07-09

1998-11-24

Swann, Glen

Communications: electrical

Condition responsive indicating system

Specific condition

29DIG95, 148103, 148108, 148DIG3, 420 95, G08B 1324

Patent

active

058413480

ABSTRACT:
A resonator for use in a marker, with a bias element which produces a bias field, in a magnetomechanical electronic article surveillance system is composed of an amorphous magnetostrictive alloy containing iron, cobalt, nickel, silicon and boron in quantities for giving the resonator a quality Q which is between about 100 and 600. The amorphous magnetostrictive alloy is annealed in a transverse magnetic field for giving it a B-H loop which is linear up to about 8 Oe and an anisotropy field strength of at least 10 Oe. When the resonator is excited to resonate by a signal emitted by the transmitter in the surveillance system, it produces a signal at a mechanical resonant frequency which can be detected by the receiver of the detection system. Due to the resonator having a quality Q in the above range, the signal produced by the resonator in a first detector window, beginning approximately 0.4 ms after excitation, has a high amplitude which is no more than 15 dB below its amplitude immediately after excitation, but drops to a level in a the second detection window, beginning approximately 6 mm after excitation, which is at least approximately 15 dB below its level in the first detection window.

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