Anti-theft sensor marker.

摘要

An anti-theft sensor marker is disclosed which has good sensitivity characteristics and which does not readily deteriorate due to bending stress. The marker is mainly composed of an alloy ribbon and is employed in an anti-theft system in which the stealing of a commodity previously marked by the marker is determined by detecting a magnetic field of a specific frequency with respect to an incident magnetic field intensity applied to a detection region through the alloy ribbon of the marker when the marker is disposed within the detection region. The alloy ribbon has the constitutional formula wherein, M is Co and/or Ni; M min is at least one of the elements Nb, W, Ta, Zr, Hf, Ti and Mo; M sec is at least one of the elements V, Cr, Mn, Al, platinum metals, Sc, Y, rare-earth metals, Au, Zn, Sn and Re, X is at least one of the elements C, Ge, P, Ga, Sb, In, Be and As, and a, x, y, z, alpha , beta and gamma satisfy the relations: 0