Title:
【発明の名称】偏倚材料の粒子を包含する磁気機械的EASマーカーのための能動素子
Document Type and Number:
Japanese Patent JP2001513241
Kind Code:
A
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.
Inventors:
Ryan, Min-Len
Ou Handley, Robert Sea
Ou Handley, Robert Sea
Application Number:
JP53765398A
Publication Date:
August 28, 2001
Filing Date:
February 04, 1998
Export Citation:
Assignee:
SENSORMATIC ELECTORONICS CORPORATION
International Classes:
G08B13/24; H01F1/04; H01F1/14; H01F1/153; H01L41/12; H01L41/20; (IPC1-7): G08B13/24; H01F1/04; H01F1/14; H01L41/12
Domestic Patent References:
| JPH08278373A | 1996-10-22 | |||
| JPH01131995A | 1989-05-24 | |||
| JPH01503577A | 1989-11-30 |
Foreign References:
| US5252144A | 1993-10-12 |
Attorney, Agent or Firm:
Yuzo Yamazaki (2 outside)