page_title: Barium ferrite
section_title: Applications
hierarchical_section_title: Barium ferrite / Applications
caption_attribution_description: English: DDS tape drive and four examples of magnetic data storage media (shown on top of tape drive). From left to right: 150m DDS-4 tape (4 mm wide, 492 feet long, 20 GB capacity), 112m Data8 tape (8 mm, 367 ft., 5 GB), 310m QIC DC tape (~6 mm, 1020 ft., 250 MB), and 3.5" floppy disk (1.44 MB) Polski: napęd taśmowy DDS, na nim od prawej: dyskietka 3,5", taśma DC (250 MB, 6 mm, 310,9 mb), taśma DL (20 GB nieskompresowane, 8 mm, 112 mb), taśma DDS (20 GB nieskompresowane, 4 mm, 150 mb) Русский: На DDS-стримере, справа налево: 3,5-дюймовая дискета (1.44 МБайт), DC-кассета (250 МБайт), DL-кассета, DDS-кассета (20 ГБайт несжатой информации).
context_page_description: Barium ferrite, abbreviated BaFe, BaM, is the chemical compound with the formula BaFe₁₂O₁₉. This and related ferrite materials are components in magnetic stripe cards and loudspeaker magnets. BaFe is described as Ba²⁺(Fe³⁺)₁₂(O²⁻)₁₉. The Fe³⁺ centers are ferromagnetically coupled. This area of technology is usually considered to be an application of the related fields of materials science and solid state chemistry.
  Barium ferrite is a highly magnetic material, has a high packing density, and is a metal oxide. Studies of this material date at least as far back as 1931, and it has found applications in magnetic card strips, speakers, and magnetic tapes. One area in particular it has found success in is long-term data storage; the material is magnetic, resistant to temperature change, corrosion and oxidization.
context_section_description: Barium ferrite is used in applications such as recording media, permanent magnets, and magnetic stripe cards (credit cards, hotel keys, ID cards). Due to the stability of the material, it is able to be greatly reduced in size, making the packing density much greater. Earlier media devices utilized doped acicular oxide materials to yield the coercivity values necessary to record. In recent decades, barium ferrite has replaced acicular oxides; without any dopants, the acicular oxides produce very low coercivity values, making the material very magnetically soft, while barium ferrite's higher coercivity levels make the material magnetically hard and thus a superior choice for recording material applications.
caption: Barium Ferrite is used in tape drives and floppy disks.
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