Anti-theft tags contain a tiny mechanical oscillator that is activated by a magnetic field. The detectors at a shop's doorway can detect the oscillation magnetically. The tag can be activated and deactivated by magnetizing or demagnetizing it, respectively.
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Sources:
www.metglas.com/products/magne...
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www.google.com/patents/US4298862
en.wikipedia.org/wiki/Magneto...
Негізгі бет Ғылым және технология How anti-theft tags work - magnetostriction
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