barium ferrite card
  n.
   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

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