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What are Acousto-magnetic systems?

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What are Acousto-magnetic systems?
Magnetic security tags made of two strips o metal, a strip of magnetostrictive, ferromagnetic amorphous metal and a strip of a magnetically semi-hard metallic strip. The strips are activated when magnetized and deactivated when demagnetized. The EAS detectors for these types of tags emit periodic tonal bursts at about 58 kHz causing the magnetic strips to vibrate and depending on the change on the magnetization will cause the EAS detection system or antennas to detect the change and sound an alarm.