Security element for electronic article security has semi-strong or strong magnetic material arranged to suppress weak magnetic material's characteristic signal when magnetized

摘要

The security element consists of a weak magnetic material (9) stimulated by an external magnetic field to emit a characteristic signal and a semi-strong or strong magnetic material (8) arranged relative to the weak magnetic material to suppress the characteristic signal in the magnetized state. The semi-strong or strong magnetic material has approximately null magnetostriction