Magnetic tape device and magnetic reproducing method
The magnetic tape device includes: a magnetic tape; and a reproducing head, in which a magnetic tape transportation speed of the magnetic tape device is equal to or lower than 18 m/sec, the reproducing head is a magnetic head including a tunnel magnetoresistance effect type element as a reproducing element, the magnetic tape includes a non-magnetic support, and a magnetic layer including ferromagnetic powder and a binding agent on the non-magnetic support, and a coefficient of friction measured regarding a base portion of a surface of the magnetic layer is equal to or smaller than 0.30.
1. A magnetic tape device comprising:
a magnetic tape; and
a reproducing head,
wherein the magnetic tape transportation speed of the magnetic tape device is equal to or lower than 18 msec,
the reproducing head is a magnetic head including a tunnel magnetoresistance effect type element as a reproducing element,
the magnetic tape includes a non-magnetic support, and a magnetic layer including ferromagnetic powder and a binding agent on the non-magnetic support,
the coefficient of friction measured regarding a base portion of a surface of the magnetic layer is 0.23 to 0.28, and
the coefficient of friction measured regarding the base portion is a value measured by allowing a diamond spherical indenter having a radius of 1 μm to reciprocate once with a load of 100 μN and a speed of 1 μm/sec on the base portion to measure a frictional force and a normal force, and calculating the value of the coefficient of friction μ from the arithmetical means of the frictional and normal forces.
2. The magnetic tape device according to claim 1 ,
wherein the center line average surface roughness Ra measured regarding a surface of the magnetic layer is equal to or smaller than 2.8 nm.
3. The magnetic tape device according to claim 2 ,
wherein the center line average surface roughness Ra is equal to or smaller than 2.5 nm.
4. The magnetic tape device according to claim 1 ,
wherein the magnetic tape includes a non-magnetic layer including non-magnetic powder and a binding agent between the non-magnetic support and the magnetic layer, and
the total thickness of the magnetic layer and the non-magnetic layer is equal to or smaller than 1.8 μm.
5. The magnetic tape device according to claim 4 ,
wherein the total thickness of the magnetic layer and the non-magnetic layer is equal to or smaller than 1.1 μm.
6. A magnetic reproducing method comprising:
reproducing information, recorded on a magnetic tape, by a reproducing head,
wherein the magnetic tape transportation speed during the reproducing is equal to or lower than 18 msec,
the reproducing head is a magnetic head including a tunnel magnetoresistance effect type element as a reproducing element,
the magnetic tape includes a non-magnetic support, and a magnetic layer including ferromagnetic powder and a binding agent on the non-magnetic support,
the coefficient of friction measured regarding a base portion of a surface of the magnetic layer is 0.23 to 0.28, and
the coefficient of friction measured regarding the base portion is a value measured by allowing a diamond spherical indenter having a radius of 1 μm to reciprocate once with a load of 100 μN and a speed of 1 μm/sec on the base portion to measure a frictional force and a normal force, and calculating the value of the coefficient of friction μ from the arithmetical means of the frictional and normal forces.
7. The magnetic reproducing method according to claim 6 ,
wherein the center line average surface roughness Ra measured regarding a surface of the magnetic layer is equal to or smaller than 2.8 nm.
8. The magnetic reproducing method according to claim 7 ,
wherein the center line average surface roughness Ra is equal to or smaller than 2.5 nm.
9. The magnetic reproducing method according to claim 6 ,
wherein the magnetic tape includes a non-magnetic layer including non-magnetic powder and a binding agent between the non-magnetic support and the magnetic layer, and
the total thickness of the magnetic layer and the non-magnetic layer is equal to or smaller than 1.8 μm.
10. The magnetic reproducing method according to claim 9 ,
wherein the total thickness of the magnetic layer and the non-magnetic layer is equal to or smaller than 1.1 μm.