Magnetic tape and method of manufacturing the same, and magnetic recording device
AssigneeFUJIFILM Corporation
InventorsTakeshi Harasawa, Masahiko Mori
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Abstract
An aspect of the present invention relates to a magnetic tape comprising a magnetic layer containing a ferromagnetic powder and a binder on a nonmagnetic support, wherein the ferromagnetic powder is a hexagonal ferrite powder, squareness in a vertical direction without demagnetizing field correction of the magnetic layer ranges from 0.6 to 1.0, and the magnetic layer further comprises a compound in which a substituent selected from the group consisting of a carboxyl group and a hydroxyl group is directly substituted into a ring structure comprising a double bond and having a ClogP falling within a range of 2.3 to 5.5.
Claims10
A magnetic tape comprising a magnetic layer containing a ferromagnetic powder and a binder on a nonmagnetic support, wherein
- the ferromagnetic powder is a hexagonal ferrite powder,
- squareness in a vertical direction without demagnetizing field correction of the magnetic layer ranges from 0.6 to 1.0,
- the magnetic layer further comprises a compound in which a substituent selected from the group consisting of a carboxyl group and a hydroxyl group is directly substituted into a ring structure comprising a double bond and having a ClogP falling within a range of 2.3 to 5.5, and has a negative value of a magnetic interaction, ΔM, calculated by equation (1) below:
- ΔM=(Id(H)+2Ir(H)−Ir(∞))/Ir(∞) (1)
- wherein in equation (1), Id(H) denotes residual magnetization measured with DC demagnetization, Ir(H) denotes residual magnetization measured with AC demagnetization, and Ir(∞) denotes residual magnetization measured at an applied magnetic field of 796 kA/m (10 kOe).
Dependencies are inferred from the claim text.