barium ferrite card

   an access control system credential consisting of magnetized ferrite embedded in a plastic card with polarity and location being important features

Locksmith dictionary . 2014.

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  • Barium ferrite — Barium ferrite, abbreviated BaFe, is the chemical compound with the formula BaFe2O4. This and related ferrite materials are components in magnetic stripe cards. BaFe is described as Ba2+(Fe3+)2(O2 )4. The Fe3+ centers, with a high spin d5… …   Wikipedia

  • Cardkey — is the name of the company that started an Industry and were based in Silicon Valley, California. They were the first company to develop and widely distribute Electronic Access Control Systems . Once a division of Greer Hydraulics, Inc., they… …   Wikipedia

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  • Vacuum tube — This article is about the electronic device. For experiments in an evacuated pipe, see free fall. For the transport system, see pneumatic tube. Modern vacuum tubes, mostly miniature style In electronics, a vacuum tube, electron tube (in North… …   Wikipedia

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