How anti-theft tags work - magnetostriction

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:

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

https://www.google.com/patents/WO1999013442A1?cl=en&dq=magnetostrictive+marker&hl=en&sa=X&ved=0ahUKEwjT8bCCtLLJAhVP9GMKHYThCY8Q6AEIMjAD

https://patents.google.com/patent/WO2008032274A2/en?q=magnetostrictive&q=amorphous&q=theft

https://www.google.com/patents/US4510489?dq=4,510,489&hl=en&sa=X&ved=0ahUKEwi0x_SosbLJAhVJyWMKHbl_AI4Q6AEIHDAA

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

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

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See how your trusty toothbrush becomes worn out.

Special thanks to Harri Lähteenmäki  and Johannes S. Zwilling for sending me the smooth zoom footage of the tungsten filament, and showing me how to use After Effects to get a much better effect.  I really appreciate it!  http://www.videocopilot.net/tutorials/earth_zoom/

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Macrophotgraphy with a microscope objective: https://www.youtube.com/watch?v=HVSjUW2qQ6U