| 摘要 |
The invention relates to display elements for use in a magnetic merchandise monitoring system, consisting of one or more oblong, ductile, magnetostrictive bands made of an amorphous ferromagnetic material. These bands undergo a change in resonance frequency as a result of a change in a premagnetization field and are excited by a magnetic alternating field to produce longitudinal, mechanical resonant vibration at the resonance frequency fr. The mechanical tensions resulting from the resonant vibration bring about a change in the magnetization of the bands and, as a result, a detectable change in the magnetic alternating field. The material of which the bands are made has a flat BH loop which runs as linear as possible until the area of saturation. The bands are also magnetically anisotropic perpendicular to their lengthwise direction, the intensity of the field of anisotropy being greater than the intensity of the premagnetization field. The bands undergo a change in resonance frequency in relation to the change in the intensity of the premagnetization field dfr/dHBias >/= 1500 Hz/Oe and in this respect have a quality factor Q >/= 100 in a field range dHBIAS >/= 1 Oe. 00000 |
