Patent ID: 8681451
Filing Date: 2014-03-25
Classification: G11B

Abstract:
1. 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: 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).