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US 9,704,525 B2Granted
Magnetic tape
AssigneeFUJIFILM Corporation
InventorNorihito Kasada
Life of this patent
Estimating the term…
Abstract
The magnetic tape includes a magnetic layer containing ferromagnetic hexagonal ferrite powder, abrasive, and binder on a nonmagnetic support, wherein the ferromagnetic hexagonal ferrite powder exhibits an activation volume of less than or equal to 1,800 nm3, and inclination, cos θ, of the ferromagnetic hexagonal ferrite powder relative to a surface of the magnetic layer as determined by sectional observation by a scanning electron transmission microscope is greater than or equal to 0.85 but less than or equal to 1.00.
Claims19
A magnetic tape,
- which comprises a magnetic layer comprising ferromagnetic hexagonal ferrite powder, abrasive, and binder on a nonmagnetic support,
- wherein the ferromagnetic hexagonal ferrite powder exhibits an activation volume of less than or equal to 1,800 nm3,
- inclination, cos θ, of the ferromagnetic hexagonal ferrite powder relative to a surface of the magnetic layer as determined by sectional observation by a scanning electron transmission microscope is greater than or equal to 0.85 but less than or equal to 0.98, and
- among all hexagonal ferrite particles included in the ferromagnetic hexagonal ferrite powder in the magnetic layer, the proportion accounted for by hexagonal ferrite particles having a length in the major axis direction of greater than or equal to 10 nm and having an aspect ratio ranging from 1.5 to 6.0 is greater than or equal to 50% but less than or equal to 95%.
1 more element
Dependencies are inferred from the claim text.