Two-stage annealing process for amorphous ribbon used in an EAS

Details Two-stage annealing process for amorphous ribbon used in an EAS Two-stage annealing process for amorphous ribbon used in an EAS

1995-07-28

1996-10-22

Swann, Glen

Communications: electrical

Condition responsive indicating system

Specific condition

148108, 148DIG3, 266110, 266249, G08B 1324

Patent

active

055681255

ABSTRACT:
A two-step continuous annealing process is applied to an amorphous metal alloy ribbon. During the first annealing step, a saturating transverse magnetic field is applied, and the field is omitted during the second annealing step. After the two annealing steps, the material is cut into discrete strips suitable for use as active elements in pulsed-field magnetomechanical EAS markers. The resulting markers exhibit satisfactory total frequency shift and ring-down signal amplitude characteristics, without excessive sensitivity to bias field variations.

REFERENCES:
patent: 4510489 (1985-04-01), Anderson, III et al.
patent: 5252144 (1993-10-01), Martis
patent: 5469140 (1995-11-01), Liu et al.
patent: 5494534 (1996-02-01), Leu

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