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FujiFilm High-Density Recording Study on Particulate Magnetic Tape Using Barium Ferrite Magnetic Particles

A High-Density Recording Study on Particulate Magnetic Tape using Barium Ferrite Magnetic Particles

Fuji have developed an advanced barium ferrite tape with a magnetic particle volume of 1600 nm3 ; a surface roughness Ra of 0.9 nm, as determined by optical interferometry; a 10-point average roughness Rz of 27 nm, as determined by atomic force microscopy, and a perpendicular squareness ratio of 0.87; the tape features a magnetic particulate coating medium enhanced by fine magnetic particle technology, surface profile design, and particle orientation control. In combination with advanced tape drive technologies, this tape demonstrated an areal density of 123 Gbit/inch 2 , corresponding to a cartridge capacity of 220 TB.

Using barium ferrite particles with a particle volume of 1600 nm 3, they have succeeded in producing magnetic tape with long- wavelength average roughness Ra of 0.9 nm determined by an optical interferometry profiler, short-wavelength 10-point average roughness Rz of 27 nm determined by AFM and perpendicular SQ of 0.87, in the form of a particulate coating medium. In combination with the tape drive manufacturer ’ s technical innovations in tape drive technology, such as the magnetic head and signal processing, this magnetic tape has demonstrated an areal density of 123 Gbit/inch 2 , the highest for particulate magnetic tape 6 ) , indicating potential for achieving a cartridge capacity of 220 TB. They have also succeeded in producing magnetic particles with a particle volume of 1000 nm 3 , which shows potential for still higher-density recording. We believe, therefore, that the capacity of particulate magnetic tape using barium ferrite particles will be further increased.

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