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Abstract

A magnetic theft detection system marker is adapted to generate magnetic fields at frequencies that (1) are harmonically related to an incident magnetic field applied within an interrogation zone and (2) have selected tones that provide the marker with signal identity. The marker is an elongated, ductile strip of amorphous ferromagnetic material having a composition defined by the formula M.sub.a N.sub.b O.sub.c X.sub.d Y.sub.e Z.sub.f, where M is at least one of iron and cobalt, N is nickel, O is at least one of chromium and molybdenum, X is at least one of boron and phosphorous, Y is silicon, Z is carbon, 'a'-'f' are in atom percent, 'a' ranges from about 35-85, 'b' ranges from about 0-45, 'c' ranges from about 0-7, 'd' ranges from about 5-22, 'e' ranges from about 0-15 and 'f' ranges from about 0-2, and the sum of d+e+f ranges from about 15-25.

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First Claim