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US 12,249,360 B2Granted
Magnetic tape, magnetic tape cartridge, and magnetic tape apparatus
AssigneeFUJIFILM Corporation
InventorNorihito Kasada
Life of this patent
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Abstract
The magnetic tape includes a non-magnetic support, and a magnetic layer containing a ferromagnetic powder. The ferromagnetic powder is a hexagonal ferrite powder, tilt cos θ of the hexagonal ferrite powder with respect to a surface of the magnetic layer, which is acquired by cross-sectional observation performed using a scanning transmission electron microscope, is 0.85 or more and 1.00 or less, and standard deviation σ of the cos θ in a width direction of the surface of the magnetic layer is 0.03 or less.
Claims14
A magnetic tape comprising:
- a non-magnetic support;
- a magnetic layer containing a ferromagnetic powder;
- and
- a non-magnetic layer containing a non-magnetic powder between the non-magnetic support and the magnetic layer,
- wherein the ferromagnetic powder is a hexagonal ferrite powder,
- a fluorine-containing compound is included in a portion on the non-magnetic support on a magnetic layer side,
- the non-magnetic powder includes carbon black having a pH of 9.0 or less and an Fe-based inorganic oxide powder having an average particle volume of 2.0×10−6 μm3 or less,
- tilt cos θ of the hexagonal ferrite powder with respect to a surface of the magnetic layer, which is acquired by cross-sectional observation performed using a scanning transmission electron microscope, is 0.85 or more and 1.00 or less, and
- standard deviation σ of the cos θ in a width direction of the surface of the magnetic layer is 0.03 or less.
6 more elements
Dependencies are inferred from the claim text.