Deactivatable security label for anti-theft systems

Claim 1

In a deactivatable security label for anti-theft systems, wherein a low-coercivity label can alter an alternating magnetic field generated in a test zone to trigger an alarm, said label being composed of at least first and second strips of ferromagnetic material arranged close to one another with at least the first strip being composed of a low-coercivity material having a high permeability and a low coercive field strength and the second strip exhibiting a high coercive field strength and being magnetizable so that the occurring fringe field permeates the first strip in mutually opposite directions in adjacent sections, the improvements comprising the strips forming the security label being firmly connected to one another to form a laminate, said second strip having the high coercive field strength being composed of a cobalt-based alloy which additionally contains a material selected from a group consisting of nickel and a combination of nickel and iron, a coercive field strength of the second strip being in a range of between 20 and 50 A/cm given a remanence induction of more than one Tesla and that a series of differently polarized magnets serve for deactivation of the security label to oppositely magnetize the security label in sections.