Magnetic tape having servo pattern and characterized magnetic layer, and magnetic tape device

1. A magnetic tape comprising:

a non-magnetic support; and

a magnetic layer including a ferromagnetic powder on the non-magnetic support,

wherein a thickness of the non-magnetic support is 3.00 to 4.50 μm,

the magnetic layer has a servo pattern,

a center line average surface roughness Ra measured regarding a surface of the magnetic layer is equal to or smaller than 1.8 nm, and

an isoelectric point of a surface zeta potential of the magnetic layer is equal to or greater than 5.5.

2. The magnetic tape according to claim 1 ,

wherein the isoelectric point is 5.5 to 7.0.

3. The magnetic tape according to claim 1 ,

wherein the magnetic layer includes a binding agent including an acidic group.

4. The magnetic tape according to claim 3 ,

wherein the acidic group includes at least one kind of acidic group selected from the group consisting of a sulfonic acid group and a salt thereof.

5. The magnetic tape according to claim 1 ,

wherein the center line average surface roughness Ra measured regarding the surface of the magnetic layer is 1.2 nm to 1.8 nm.

6. The magnetic tape according to claim 1 , further comprising:

a non-magnetic layer including a non-magnetic powder between the non-magnetic support and the magnetic layer.

7. The magnetic tape according to claim 1 , further comprising:

a back coating layer including a non-magnetic powder on a surface of the non-magnetic support opposite to a surface provided with the magnetic layer.

8. A magnetic tape device comprising:

the magnetic tape according to claim 1 ;

a magnetic head; and

a servo head.