Magnetic tape having characterized magnetic layer

A magnetic tape comprising:

• a non-magnetic support;
• a non-magnetic layer including non-magnetic powder and a binding agent on the non-magnetic support;
• and
• a magnetic layer including ferromagnetic powder and a binding agent on the non-magnetic layer,
• wherein the total thickness of the non-magnetic layer and the magnetic layer is equal to or smaller than 0.60 μm,
• the magnetic layer includes an abrasive,
• the percentage of a plan view maximum area of the abrasive confirmed in a region having a size of 4.3 μm ×6.3 μm of the surface of the magnetic layer with respect to the total area of the region, obtained by plane observation performed by using a scanning electron microscope is equal to or greater than 0.02% and less than 0.06%,
• the logarithmic decrement acquired by a pendulum viscoelasticity test performed regarding the surface of the magnetic layer is 0.010 to 0.050, and
• the logarithmic decrement on the magnetic layer side is determined by the following method:
• securing a measurement sample of the magnetic tape with the measurement surface, which is the surface on the magnetic layer side, facing upward on a substrate in a pendulum viscoelasticity tester;
• disposing a columnar cylinder edge which is 4 mm in diameter and equipped with a pendulum 13 g in weight on the measurement surface of the measurement sample such that the long axis direction of the columnar cylinder edge runs parallel to the longitudinal direction of the measurement sample;
• raising the surface temperature of the substrate on which the measurement sample has been positioned at a rate of less than or equal to 5° C./min up to 80° C.;
• inducing initial oscillation of the pendulum;
• monitoring the displacement of the pendulum while it is oscillating to obtain a displacement-time curve for a measurement interval of greater than or equal to 10 minutes;
• and
• obtaining the logarithmic decrement Δ from the following equation:
• Δ
• =
• ln
• ⁡
• (
• A
• 1
• A
• 2
• )
• +
• ln
• ⁡
• (
• A
• 2
• A
• 3
• )
• +
• …
• ⁢
• ⁢
• ln
• ⁡
• (
• A
• n
• A
• n
• +
• 1
• )
• n
• wherein the interval from one minimum displacement to the next minimum displacement is adopted as one wave period;
• the number of waves contained in the displacement-time curve during one measurement interval is denoted by n, the difference between the minimum displacement and the maximum displacement of the nth wave is denoted by An, and the logarithmic decrement is calculated using the difference between the next minimum displacement and maximum displacement of the nth wave (An+1 in the above equation).