Annealing magnetic elements for stable mechanical properties

Details Annealing magnetic elements for stable mechanical properties Annealing magnetic elements for stable mechanical properties

1996-07-01

1999-02-09

Swann, Glen

Communications: electrical

Condition responsive indicating system

Specific condition

148561, 148DIG3, 148DIG22, 148DIG71, 340572, 420125, 420590, G08B 13187

Patent

active

058700218

ABSTRACT:
A control element for a magnetomechanical EAS marker is formed of an amorphous metalloid that has been annealed so as to be at least partially crystallized while remaining substantially flat. The annealing is preferably a two-stage process applied to induce semi-hard magnetic characteristics in an amorphous metallic material that is magnetically soft as cast. The two stages include a first stage in which the material is annealed for at least one hour at a temperature that is below a crystallization temperature of the material. The first stage results in a reduction in the volume of the material. The second stage is carried out at a temperature that is above the crystallization temperature and for a time sufficient to crystallize the bulk of the material and give it semi-hard magnetic properties. The two-stage annealing process prevents deformation of the material which has resulted from conventional crystallization processes.

REFERENCES:
patent: 4510489 (1985-04-01), Anderson, III et al.
patent: 4510490 (1985-04-01), Anderson, III et al.
patent: 5252144 (1993-10-01), Martis
patent: 5351033 (1994-09-01), Liu et al.
patent: 5684459 (1997-11-01), Liu et al.

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