MAGNETIC TAPE DEVICE AND MAGNETIC REPRODUCING METHOD

• US 20180182429A1
• Filed: 12/26/2017
• Published: 06/28/2018
• Est. Priority Date: 12/27/2016
• Status: Active Grant

• Current Assignee: Fujifilm Corporation (Fujifilm Holdings Corporation)
• Original Assignee: Fujifilm Corporation (Fujifilm Holdings Corporation)
• Inventors: KASADA, Norihito, OZAWA, Eiki, KANEKO, Tetsuya
• Granted Patent: US 10,438,628 B2
• Time in Patent Office: Days
• CPC Class Codes: G11B 15/46 Controlling, regulating, or indicating speed dependent on position of tape in reserve, loop G11B15/56, G11B15/58
• CPC Class Codes: G11B 5/3909 Arrangements using a magnetic tunnel junction
• CPC Class Codes: G11B 5/70 on a base layer
• CPC Class Codes: G11B 5/706 characterised by the composition of the magnetic material
• CPC Class Codes: G11B 5/73 Base layers , i.e. all non-magnetic layers lying under a lowermost magnetic recording layer, e.g. including any non-magnetic layer in between a first magnetic recording layer and either an underlying substrate or a soft magnetic underlayer
• CPC Class Codes: G11B 5/78 Tape carriers
• CPC Class Codes: G11B 5/842 Coating a support with a liquid magnetic dispersion

Abstract

The magnetic tape device includes: a magnetic tape; and a reproducing head, in which a magnetic tape transportation speed of the magnetic tape device is equal to or lower than 18 m/sec, the reproducing head is a magnetic head including a tunnel magnetoresistance effect type element as a reproducing 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 one or more components selected from the group consisting of fatty acid and fatty acid amide, 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 45 to 65 atom %.

Claims

1. A magnetic tape device comprising:

a magnetic tape; and

a reproducing head,

wherein a magnetic tape transportation speed of the magnetic tape device is equal to or lower than 18 m/sec,

the reproducing head is a magnetic head including a tunnel magnetoresistance effect type element as a reproducing 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 one or more components selected from the group consisting of fatty acid and fatty acid amide, 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 45 to 65 atom %.

2. The magnetic tape device according to claim 1,

wherein the C—

H derived C concentration is 50 to 65 atom %.

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 μ

m.

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 μ

m.

7. A magnetic reproducing method comprising:

reproducing information recorded on a magnetic tape by a reproducing head, wherein a magnetic tape transportation speed during the reproducing is equal to or lower than 18 m/sec,

the reproducing head is a magnetic head including a tunnel magnetoresistance effect type element as a reproducing 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 one or more components selected from the group consisting of fatty acid and fatty acid amide, 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 45 to 65 atom %.

8. The magnetic reproducing method according to claim 7,

wherein the C—

H derived C concentration is 50 to 65 atom %.

9. The magnetic reproducing 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 magnetic reproducing method according to claim 9,

wherein the center line average surface roughness Ra is equal to or smaller than 2.5 nm.

11. The magnetic reproducing 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 μ

m.

12. The magnetic reproducing 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 μ

m.