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US 2021/0287704 A1Published application
Magnetic tape, magnetic tape cartridge, and magnetic recording and reproducing apparatus
AssigneeFUJIFILM Corporation
InventorsEiki Ozawa, Norihito Kasada, Takashi Fujimoto
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Abstract
The magnetic tape includes a non-magnetic support and a magnetic layer including ferromagnetic powder, in which the ferromagnetic powder is ε-iron oxide powder, and a coefficient of variation of an anisotropic magnetic field Hk in a longitudinal direction of the magnetic tape is 2.0% or more and 10.0% or less.
Claims20
A magnetic tape comprising:
- a non-magnetic support, and
- a magnetic layer including ferromagnetic powder,
- wherein the ferromagnetic powder is ε-iron oxide powder,
- a coefficient of variation of an anisotropic magnetic field Hk in a longitudinal direction of the magnetic tape is 2.0% or more and 10.0% or less, and
- the coefficient of variation is determined according to the following expression by obtaining an anisotropic magnetic field Hk at each of 50 locations at an interval of 10 cm in the longitudinal direction of the magnetic tape and then obtaining an arithmetic average HkA and a standard deviation HkD of values of the obtained 50 anisotropic magnetic fields Hk's,
- coefficient of variation=(HkD/HkA)×100.
3 more elements
Dependencies are inferred from the claim text.