Active element for magnetomechanical EAS marker incorporating pa

Details Active element for magnetomechanical EAS marker incorporating pa Active element for magnetomechanical EAS marker incorporating pa

1997-02-14

1998-10-20

Hofsass, Jeffery A.

Communications: electrical

Condition responsive indicating system

Specific condition

340551, 146108, 146121, 146122, 148307, 148308, 148311, G08B 1314

Patent

active

058252908

ABSTRACT:
A self-biasing magnetostrictive element for use in a magnetomechanical EAS marker is a strip of amorphous alloy with crystalline particles of semi-hard or hard magnetic material distributed throughout the bulk of the amorphous alloy strip. The crystalline particles are magnetized to bias the amorphous alloy strip to resonate in response to an interrogation signal. The crystalline particles are formed by heat-treating the amorphous alloy strip at a temperature above the Curie temperature of the amorphous alloy in the presence of a longitudinal magnetic field. The alloy strip is then cross-field annealed at a temperature below the Curie temperature of the amorphous alloy to form a transverse anisotropy in the amorphous bulk of the alloy strip. A preferred alloy composition includes iron, cobalt, niobium, copper, boron and silicon.

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R.C. O'Handley, et al., "Magnetization process in devitrified glassy alloy", J. Appl. Phys. 57 (1), 15 Apr. 1985, pp. 3563-3565.

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