MAGNETIC TAPE AND MAGNETIC TAPE DEVICE

• US 20170358318A1
• Filed: 06/06/2017
• Published: 12/14/2017
• Est. Priority Date: 06/10/2016
• Status: Active Grant

• Current Assignee: Fujifilm Corporation (Fujifilm Holdings Corporation)
• Original Assignee: Fujifilm Corporation (Fujifilm Holdings Corporation)
• Inventors: KASADA, Norihito, KANEKO, Tetsuya, OZAWA, Eiki
• Granted Patent: US 10,431,248 B2
• Time in Patent Office: Days
• CPC Class Codes: G11B 5/00813 magnetic tapes
• CPC Class Codes: G11B 5/584 for track following on tapes
• CPC Class Codes: G11B 5/70 on a base layer
• CPC Class Codes: G11B 5/71 characterised by the lubricant
• CPC Class Codes: G11B 5/78 Tape carriers

Abstract

The magnetic tape includes a non-magnetic layer including non-magnetic powder and a binder on a non-magnetic support; and a magnetic layer including ferromagnetic powder and a binder on the non-magnetic layer, in which the magnetic layer includes a timing-based 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, 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 %.

Claims

1. A magnetic tape comprising:

a non-magnetic layer including non-magnetic powder and a binder on a non-magnetic support; and

a magnetic layer including ferromagnetic powder and a binder on the non-magnetic layer,

wherein the magnetic layer includes a timing-based 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,

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 in a range of 45 to 80 atom %.

3. The magnetic tape according to claim 1,

wherein the C—

H derived C concentration is in a range of 60 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 respectively included in the magnetic layer and the non-magnetic layer.

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,

wherein the center line average surface roughness Ra measured regarding the surface of the magnetic layer is 1.2 nm to 1.61 nm.

7. The magnetic tape according to claim 1,

wherein the C—

H derived C concentration is in a range of 45 to 80 atom %, and

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

8. The magnetic tape according to claim 1,

wherein the C—

H derived C concentration is in a range of 60 to 80 atom %, and

the center line average surface roughness Ra measured regarding the surface of the magnetic layer is 1.2 nm to 1.6 nm.

9. 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 layer including non-magnetic powder and a binder on a non-magnetic support; and

a magnetic layer including ferromagnetic powder and a binder on the non-magnetic layer,

wherein the magnetic layer includes a timing-based 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,

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 %.

10. The magnetic tape device according to claim 9,

wherein the C—

H derived C concentration is in a range of 45 to 80 atom %.

11. The magnetic tape device according to claim 9,

wherein the C—

H derived C concentration is in a range of 60 to 80 atom %.

12. The magnetic tape device according to claim 9,

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

13. The magnetic tape device according to claim 9,

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 9,

wherein the center line average surface roughness Ra measured regarding the surface of the magnetic layer is 1.2 nm to 1.6 nm.

15. The magnetic tape device according to claim 9,

wherein the C—

H derived C concentration is in a range of 45 to 80 atom %, and

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

16. The magnetic tape device according to claim 9,

wherein the C—

H derived C concentration is in a range of 60 to 80 atom %, and

the center line average surface roughness Ra measured regarding the surface of the magnetic layer is 1.2 nm to 1.6 nm.