Magnetic tape, magnetic tape cartridge, and magnetic tape apparatus
The magnetic tape includes a non-magnetic support and a magnetic layer including ferromagnetic powder and a binding agent, in which the magnetic layer has a timing-based servo pattern, an edge shape of the timing-based servo pattern, specified by magnetic force microscopy is a shape in which a difference (L 99.9 −L 0.1 ) between a value L 99.9 of a cumulative distribution function of 99.9% and a value L 0.1 of a cumulative distribution function of 0.1% in a position deviation width from an ideal shape of the magnetic tape in a longitudinal direction is 180 nm or less, and an isoelectric point of a surface zeta potential of the magnetic layer is 3.8 or less.
1. A magnetic tape apparatus comprising:
a magnetic tape;
a reading element unit; and
an extraction unit,
wherein the magnetic tape comprises:
a non-magnetic support; and
a magnetic layer including ferromagnetic powder and a binding agent,
wherein the magnetic layer has a timing-based servo pattern,
an edge shape of the timing-based servo pattern, specified by magnetic force microscopy is a shape in which a difference L 99.9 -L 0.1 between a value L 99.9 of a cumulative distribution function of 99.9% and a value L 0.1 of a cumulative distribution function of 0.1% in a position deviation width from an ideal shape of the magnetic tape in a longitudinal direction is 180 nm or less, and
an isoelectric point of a surface zeta potential of the magnetic layer is 3.8 or less;
the reading element unit includes a plurality of reading elements each of which reads data from a specific track region including a reading target track in a track region included in the magnetic tape;
the extraction unit performs a waveform equalization process with respect to each reading result for each reading element, to extract, from the reading result, data derived from the reading target track; and
the waveform equalization process is a waveform equalization process according to a deviation amount in position between the magnetic tape and the reading element unit.
2. The magnetic tape apparatus according to claim 1 ,
wherein the isoelectric point is 2.5 or more and 3.8 or less.
3. The magnetic tape apparatus according to claim 1 ,
wherein the binding agent is a binding agent containing an acidic group.
4. The magnetic tape apparatus according to claim 3 ,
wherein the acidic group includes at least one type of acidic group selected from the group consisting of a sulfonic acid group and a salt thereof.
5. The magnetic tape apparatus according to claim 1 ,
wherein the timing-based servo pattern is a linear servo pattern which continuously extends from one side of the magnetic tape in a width direction to the other side thereof and is inclined at an angle α with respect to the width direction, and
wherein the ideal shape is a linear shape extending in a direction of the angle α.
6. The magnetic tape apparatus according to claim 1 ,
wherein the difference L 99.9 -L 0.1 is 100 nm or more and 180 nm or less.
7. The magnetic tape apparatus according to claim 1 ,
wherein the magnetic tape further comprises a non-magnetic layer including non-magnetic powder and a binding agent between the non-magnetic support and the magnetic layer.
8. The magnetic tape apparatus according to claim 1 , wherein the magnetic tape further comprises a back coating layer including non-magnetic powder and a binding agent on a surface side of the non-magnetic support opposite to a surface side provided with the magnetic layer.