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

Patent metadata

Field	Value
Publication number	US-10403316-B2
Application number	US-201816038339-A
Country	US
Kind code	B2
Filing date	Jul 18, 2018
Priority date	Jul 19, 2017
Publication date	Sep 3, 2019
Grant date	Sep 3, 2019

Abstract

The magnetic tape includes a magnetic layer including ferromagnetic powder and a binding agent, in which a magnetic tape total thickness is equal to or smaller than 5.30 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, the ferromagnetic powder is ferromagnetic hexagonal ferrite powder, an intensity ratio of a peak intensity of a diffraction peak of a (110) plane with respect to a peak intensity of a diffraction peak of a (114) plane of a hexagonal ferrite crystal structure obtained by an X-ray diffraction analysis of the magnetic layer by using an In-Plane method is 0.5 to 4.0, and a vertical direction squareness ratio of the magnetic tape is 0.65 to 1.00, and a magnetic tape device including this magnetic tape.

First claim

What is claimed is:

1. A magnetic tape comprising:
a non-magnetic support; and
a magnetic layer including ferromagnetic powder and a binding agent on the non-magnetic support,
wherein the total thickness of the magnetic tape is 1.00 μm to 5.30 μm,
the magnetic layer has a servo pattern,
the center line average surface roughness Ra measured regarding the surface of the magnetic layer is equal to or smaller than 1.8 nm,
the ferromagnetic powder is ferromagnetic hexagonal ferrite powder,
the intensity ratio Int(110)/Int(114) of the peak intensity Int(110) of a diffraction peak of a (110) plane with respect to the peak intensity Int(114) of a diffraction peak of a (114) plane of a hexagonal ferrite crystal structure obtained by an X-ray diffraction analysis of the magnetic layer by using an In-Plane method is 0.5 to 4.0, and
the vertical direction squareness ratio of the magnetic tape is 0.65 to 1.00.

2. The magnetic tape according to claim 1 ,
wherein the vertical direction squareness ratio of the magnetic tape is 0.65 to 0.90.

3. 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.

4. The magnetic tape according to claim 2 ,
wherein the center line average surface roughness Ra measured regarding the surface of the magnetic layer is 1.2 nm to 1.8 nm.

5. The magnetic tape according to claim 1 ,
wherein the total thickness of the magnetic tape is 3.00 μm to 5.30 μm.

6. The magnetic tape according to claim 2 ,
wherein the total thickness of the magnetic tape is 3.00 μm to 5.30 μm.

7. The magnetic tape according to claim 3 ,
wherein the total thickness of the magnetic tape is 3.00 μm to 5.30 μm.

8. The magnetic tape according to claim 4 ,
wherein the total thickness of the magnetic tape is 3.00 μm to 5.30 μm.

9. The magnetic tape according to claim 1 , further comprising:
a non-magnetic layer including non-magnetic powder and a binding agent between the non-magnetic support and the magnetic layer.

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

11. A magnetic tape device comprising:
a magnetic tape, a magnetic head and a servo head,
wherein the magnetic tape comprises:
a non-magnetic support; and
a magnetic layer including ferromagnetic powder and a binding agent on the non-magnetic support,
wherein the total thickness of the magnetic tape is 1.00 μm to 5.30 μm,
the magnetic layer has a servo pattern,
the center line average surface roughness Ra measured regarding the surface of the magnetic layer is equal to or smaller than 1.8 nm,
the ferromagnetic powder is ferromagnetic hexagonal ferrite powder,
the intensity ratio Int(110)/Int(114) of the peak intensity Int(110) of a diffraction peak of a (110) plane with respect to the peak intensity Int(114) of a diffraction peak of a (114) plane of a hexagonal ferrite crystal structure obtained by an X-ray diffraction analysis of the magnetic layer by using an In-Plane method is 0.5 to 4.0, and
the vertical direction squareness ratio of the magnetic tape is 0.65 to 1.00.

12. The magnetic tape device according to claim 11 ,
wherein the vertical direction squareness ratio of the magnetic tape is 0.65 to 0.90.

13. The magnetic tape device according to claim 11 ,
wherein the center line average surface roughness Ra measured regarding the surface of the magnetic layer is 1.2 nm to 1.8 nm.

14. The magnetic tape device according to claim 12 ,
wherein the center line average surface roughness Ra measured regarding the surface of the magnetic layer is 1.2 nm to 1.8 nm.

15. The magnetic tape device according to claim 11 ,
wherein the total thickness of the magnetic tape is 3.00 μm to 5.30 μm.

16. The magnetic tape device according to claim 12 ,
wherein the total thickness of the magnetic tape is 3.00 μm to 5.30 μm.

17. The magnetic tape device according to claim 13 ,
wherein the total thickness of the magnetic tape is 3.00 μm to 5.30 μm.

18. The magnetic tape device according to claim 14 ,
wherein the total thickness of the magnetic tape is 3.00 μm to 5.30 μm.

19. The magnetic tape device according to claim 11 ,
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.

20. The magnetic tape device according to claim 11 ,
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.

Assignees

• Fujifilm Corp

Inventors

• Kasada Norihito

Classifications

• G11B5/00817

  on longitudinal tracks only, e.g. for serpentine format recording · CPC title

• G11B5/70678

  Ferrites · CPC title

• G11B5/70

  on a base layer · CPC title

• G11B5/70615 Primary

  containing Fe metal or alloys (G11B5/70621 takes precedence) · CPC title

• G11B5/584 Primary

  for track following on tapes · CPC title