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How anti-theft tags work - magnetostriction

Applied Science · explainer · Watch on YouTube

Everyday physics & science demosFundamental physics

What it is

Applied Science explains how retail anti-theft tags work. A tiny magnetostrictive strip acts as a mechanical oscillator excited by a magnetic field, and magnetizing or demagnetizing it arms or disarms the tag.

Why Hacker News recommends it

HN recommends it as an informative explanation of what those tags are, especially in threads about implants and RFID.

  • 1 people recommended it
  • 1 different months
  • 0 strong recommendations
  • first 2017, last 2020

What HN commenters said

  1. “here's an interesting and informative video from Applied Science on how these tags work”

    Explains how magnetostrictive anti-theft tags work

    wolfgang42, 2017-07 · Recommendation · in “Why People with Brain Implants Are Afraid to Go Through Automatic Doors”

Excerpts from Hacker News comments, linked to the originals. Summaries and labels were written by a language model from those comments.

Topics: magnetostriction, anti-theft tags, physics, eas, applied science

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