barium ferrite
: a compound of barium and iron oxide BaFe2O4 that is used in the manufacture of magnetic storage media (such as floppy disks or magnetic stripe cards)
The new generation of diskettes uses barium ferrite technology that is applied to the platter differently, more like jamming upright commuters into a train or bus. The result is considerably greater density.— Peter H. Lewis, New York Times, 25 Nov. 1990
First Known Use of barium ferrite
1957, in the meaning defined above
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