Patent ID: 6689490
Filing Date: 2004-02-10
Classification: C21D,C22C,G08B,H01F,Y10S,Y10T

Abstract:
Display element for employment in a magnetic anti-theft security system, composed of:1. an oblong alarm strip composed of an amorphous ferromagnetic alloy, and at least 2. one activation strip composed of a semi-hard magnetic alloy, characterized in that a) the semi-hard magnetic alloy of 8 to 25 weight % Ni 0.5 to 3 weight % Ti 1.5 to 4.5 weight % Al balance iron and b) the alloy can further contain 0 to 5 weight % cobalt and/or 0 to 3 weight % molybdenum or chromium and/or at least one of the elements Zr, Hf, V, Nb, Ta, W, Mn, Si in individual parts of less than 0.5 weight % of the alloy and in an overall part of less than 1 weight % of the alloy and/or at least one of the elements C, N, S, P, B,H, O in individual parts of less than 0.2 weight % of the alloy and in an overall part of less than 1 weight % of the alloy; and c) in that the semi-hard magnetic alloy exhibits a coercive force Hc of 10 to 24 A/cm and a remanence Br of at least 1.3 T (13000 Gauss).