How anti-theft tags work - magnetostriction

YouTube Description:

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.

Special thanks for your support:
Matthew Hill
Erik Saathoff
Max Loutzenheiser
(better credits titlescreen in the next video!)


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Sources:

http://www.metglas.com/products/magnetic_materials/2826mb.asp

https://www.google.com/patents/WO1999013442A1

https://patents.google.com/patent/WO2008032274A2

https://www.google.com/patents/US4510489

https://www.google.com/patents/US4298862

https://en.wikipedia.org/wiki/Magnetostriction

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