Magnetic tape device and head tracking servo method
The magnetic tape device includes: a magnetic tape; and a servo head, in which a magnetic tape transportation speed of the magnetic tape device is equal to or lower than 18 m/sec, the servo head is a magnetic head including a tunnel magnetoresistance effect type element as a servo pattern reading 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 magnetic layer includes a servo pattern, 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 servo head,
wherein a magnetic tape transportation speed of the magnetic tape device is equal to or lower than 18 m/sec,
the servo head is a magnetic head including a tunnel magnetoresistance effect type element as a servo pattern reading 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 magnetic layer includes a servo pattern, 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.
2. The magnetic tape device according to claim 1 ,
wherein the coefficient of friction measured regarding the base portion of the surface of the magnetic layer is 0.20 to 0.30.
3. The magnetic tape device according to claim 1 ,
wherein a center line average surface roughness Ra measured regarding a surface of the magnetic layer is equal to or smaller than 2.8 nm.
4. The magnetic tape device according to claim 3 ,
wherein the center line average surface roughness Ra is equal to or smaller than 2.5 nm.
5. 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
a total thickness of the magnetic layer and the non-magnetic layer is equal to or smaller than 1.8 μm.
6. The magnetic tape device according to claim 5 ,
wherein the total thickness of the magnetic layer and the non-magnetic layer is equal to or smaller than 1.1 μm.
7. A head tracking servo method comprising:
reading a servo pattern of a magnetic layer of a magnetic tape by a servo head in a magnetic tape device,
wherein a magnetic tape transportation speed of the magnetic tape device is equal to or lower than 18 m/sec,
the servo head is a magnetic head including a tunnel magnetoresistance effect type element as a servo pattern reading 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 magnetic layer includes the servo pattern, 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.
8. The head tracking servo method according to claim 7 ,
wherein the coefficient of friction measured regarding the base portion of the surface of the magnetic layer is 0.20 to 0.30.
9. The head tracking servo method according to claim 7 ,
wherein a center line average surface roughness Ra measured regarding a surface of the magnetic layer is equal to or smaller than 2.8 nm.
10. The head tracking servo method according to claim 9 ,
wherein the center line average surface roughness Ra is equal to or smaller than 2.5 nm.
11. The head tracking servo method according to claim 7 ,
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
a total thickness of the magnetic layer and the non-magnetic layer is equal to or smaller than 1.8 μm.
12. The head tracking servo method according to claim 11 ,
wherein the total thickness of the magnetic layer and the non-magnetic layer is equal to or smaller than 1.1 μm.