Magnetic tape having characterized magnetic layer surface, magnetic tape cartridge, and magnetic tape device
A magnetic tape in which a vertical switching field distribution SFD of the magnetic tape is 1.5 or less, and in an environment with a temperature of 23° C. and a relative humidity of 50%, an AlFeSil abrasion value 45 ° of a surface of the magnetic layer measured at a tilt angle of 45° of an AlFeSil prism is 20 μm to 50 μm, a standard deviation of an AlFeSil abrasion value of the surface of the magnetic layer measured at each of tilt angles of 0°, 15°, 30°, and 45° of the AlFeSil prism is 30 μm or less, and the tilt angle of the AlFeSil prism is an angle formed by a longitudinal direction of the AlFeSil prism and a width direction of the magnetic tape.
1. A magnetic tape comprising:
a non-magnetic support; and
a magnetic layer containing a ferromagnetic powder,
wherein a vertical switching field distribution SFD of the magnetic tape is 1.5 or less, and
in an environment with a temperature of 23° C. and a relative humidity of 50%,
an AlFeSil abrasion value 45 ° of a surface of the magnetic layer measured at a tilt angle of 45° of an AlFeSil prism is 20 μm to 50 μm,
a standard deviation of an AlFeSil abrasion value of the surface of the magnetic layer measured at each of tilt angles of 0°, 15°, 30°, and 45° of the AlFeSil prism is 30 μm or less, and
the tilt angle of the AlFeSil prism is an angle formed by a longitudinal direction of the AlFeSil prism and a width direction of the magnetic tape.
2. The magnetic tape according to claim 1 ,
wherein the standard deviation of the AlFeSil abrasion value is 15 μm to 30 μm.
3. The magnetic tape according to claim 1 ,
wherein the vertical switching field distribution SFD of the magnetic tape is 0.5 to 1.5.
4. The magnetic tape according to claim 1 ,
wherein a standard deviation of curvature of the magnetic tape in a longitudinal direction is 5 mm/m or less.
5. The magnetic tape according to claim 1 ,
wherein the magnetic layer contains one or more kinds of non-magnetic powder.
6. The magnetic tape according to claim 5 ,
wherein the non-magnetic powder includes an alumina powder.
7. The magnetic tape according to claim 1 , further comprising:
a non-magnetic layer containing a non-magnetic powder between the non-magnetic support and the magnetic layer.
8. The magnetic tape according to claim 1 , further comprising:
a back coating layer containing a non-magnetic powder on a surface side of the non-magnetic support opposite to a surface side provided with the magnetic layer.
9. The magnetic tape according to claim 1 ,
wherein a tape thickness is 5.2 μm or less.
10. The magnetic tape according to claim 1 ,
wherein the standard deviation of the AlFeSil abrasion value is 15 μm to 30 μm,
the vertical switching field distribution SFD of the magnetic tape is 0.5 to 1.5,
a standard deviation of curvature of the magnetic tape in a longitudinal direction is 5 mm/m or less,
the magnetic layer contains an alumina powder,
the magnetic tape further comprises:
a non-magnetic layer containing a non-magnetic powder between the non-magnetic support and the magnetic layer, and
a back coating layer containing a non-magnet powder on a surface side of the non-magnetic support opposite to a surface side provided with the magnetic layer, and
a tape thickness is 5.2 μm or less.
11. A magnetic tape cartridge comprising:
the magnetic tape according to claim 1 .
12. A magnetic tape device comprising:
the magnetic tape according to claim 1 .
13. The magnetic tape device according to claim 12 , further comprising:
a magnetic head,
wherein the magnetic head includes a module including an element array having a plurality of magnetic head elements between a pair of servo signal reading elements, and
the magnetic tape device changes an angle θ formed by an axis of the element array with respect to the width direction of the magnetic tape during running of the magnetic tape in the magnetic tape device.