Magnetic tape having characterized magnetic layer and magnetic tape device

Patent metadata

Field	Value
Publication number	US-10347280-B2
Application number	US-201715626720-A
Country	US
Kind code	B2
Filing date	Jun 19, 2017
Priority date	Jun 23, 2016
Publication date	Jul 9, 2019
Grant date	Jul 9, 2019

Abstract

A magnetic tape includes a non-magnetic layer containing non-magnetic powder and a binder on a non-magnetic support; and a magnetic layer containing ferromagnetic powder and a binder on the non-magnetic layer. The total thickness of the non-magnetic layer and the magnetic layer is equal to or less than 0.60 μm. The magnetic layer includes a timing-based servo pattern. One or more components selected from a fatty acid and a fatty acid amide are included in at least the magnetic layer. The C—H derived C concentration calculated from the C—H peak area ratio of C1s spectra obtained by X-ray photoelectron spectroscopic analysis performed on the surface of the magnetic layer at a photoelectron take-off angle of 10 degrees is equal to or greater than 45 atom %.

First claim

What is claimed is:

1. A magnetic tape comprising:
a non-magnetic support;
a non-magnetic layer including non-magnetic powder and a binder on the non-magnetic support; and
a magnetic layer including ferromagnetic powder and a binder on the non-magnetic layer,
wherein the total thickness of the non-magnetic layer and the magnetic layer is equal to or smaller than 0.60 μm,
the magnetic layer includes a timing-based servo pattern,
one or more components selected from the group consisting of fatty acid and fatty acid amide are at least included in the magnetic layer, and
a C—H derived C concentration calculated from a C—H peak area ratio of C1s spectra obtained by X-ray photoelectron spectroscopic analysis performed on the surface of the magnetic layer at a photoelectron take-off angle of 10 degrees is equal to or greater than 45 atom %.

2. The magnetic tape according to claim 1 ,
wherein the C—H derived C concentration is 45 atom % to 80 atom %.

3. The magnetic tape according to claim 1 ,
wherein the C—H derived C concentration is 50 atom % to 80 atom %.

4. The magnetic tape according to claim 1 ,
wherein one or more components selected from the group consisting of fatty acid and fatty acid amide are included respectively in the magnetic layer and the non-magnetic layer.

5. The magnetic tape according to claim 1 ,
wherein the total thickness of the non-magnetic layer and the magnetic layer is 0.20 μm to 0.60 μm.

6. The magnetic tape according claim 2 ,
wherein one or more components selected from the group consisting of fatty acid and fatty acid amide are included respectively in the magnetic layer and the non-magnetic layer.

7. The magnetic tape according to claim 2 ,
wherein the total thickness of the non-magnetic layer and the magnetic layer is 0.20 μm to 0.60 μm.

8. The magnetic tape according to claim 3 ,
wherein one or more components selected from the group consisting of fatty acid and fatty acid amide are included respectively in the magnetic layer and the non-magnetic layer.

9. The magnetic tape according to claim 3 ,
wherein the total thickness of the non-magnetic layer and the magnetic layer is 0.20 μm to 0.60 μm.

10. A magnetic tape device comprising:
a magnetic tape;
a magnetic head; and
a servo head, wherein
the magnetic tape is a magnetic tape comprising:
a non-magnetic support;
a non-magnetic layer including non-magnetic powder and a binder on the non-magnetic support; and
a magnetic layer including ferromagnetic powder and a binder on the non-magnetic layer,
wherein the total thickness of the non-magnetic layer and the magnetic layer is equal to or smaller than 0.60 μm,
the magnetic layer includes a timing-based servo pattern,
one or more components selected from the group consisting of fatty acid and fatty acid amide are at least included in the magnetic layer, and
a C—H derived C concentration calculated from a C—H peak area ratio of C1s spectra obtained by X-ray photoelectron spectroscopic analysis performed on the surface of the magnetic layer at a photoelectron take-off angle of 10 degrees is equal to or greater than 45 atom %.

11. The magnetic tape device according to claim 10 ,
wherein the C—H derived C concentration is 45 atom % to 80 atom %.

12. The magnetic tape device according to claim 10 ,
wherein the C—H derived C concentration is 50 atom % to 80 atom %.

13. The magnetic tape device according to claim 10 ,
wherein one or more components selected from the group consisting of fatty acid and fatty acid amide are included respectively in the magnetic layer and the non-magnetic layer of the magnetic tape.

14. The magnetic tape device according to claim 10 ,
wherein the total thickness of the non-magnetic layer and the magnetic layer of the magnetic tape is 0.20 μm to 0.60 μm.

15. The magnetic tape device according to claim 11 ,
wherein one or more components selected from the group consisting of fatty acid and fatty acid amide are included respectively in the magnetic layer and the non-magnetic layer of the magnetic tape.

16. The magnetic tape device according to claim 11 ,
wherein the total thickness of the non-magnetic layer and the magnetic layer of the magnetic tape is 0.20 μm to 0.60 μm.

17. The magnetic tape device according to claim 12 ,
wherein one or more components selected from the group consisting of fatty acid and fatty acid amide are included respectively in the magnetic layer and the non-magnetic layer.

18. The magnetic tape device according to claim 12 ,
wherein the total thickness of the non-magnetic layer and the magnetic layer of the magnetic tape is 0.20 μm to 0.60 μm.

Assignees

• Fujifilm Corp

Inventors

• Kasada Norihito
• Kaneko Tetsuya
• Ozawa Eiki

Classifications

• G11B5/7305

  Physics · mapped topic

• G11B5/70

  on a base layer · CPC title

• G11B5/71

  characterised by the lubricant · CPC title

• G11B5/78 Primary

  Tape carriers · CPC title

• G11B5/584

  for track following on tapes · CPC title