Magnetic tape device and magnetic reproducing method

Patent metadata

Field	Value
Publication number	US-10410666-B2
Application number	US-201815920544-A
Country	US
Kind code	B2
Filing date	Mar 14, 2018
Priority date	Mar 29, 2017
Publication date	Sep 10, 2019
Grant date	Sep 10, 2019

Abstract

The magnetic tape device includes a magnetic tape including a magnetic layer; and a TMR head (reproducing head), in which 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, a vertical direction squareness ratio of the magnetic tape is 0.65 to 1.00, Ra measured regarding a surface of the magnetic layer is equal to or smaller than 2.0 nm, 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 %.

First claim

What is claimed is:

1. A magnetic tape device comprising:
a magnetic tape; and
a reproducing head,
wherein 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 ferromagnetic powder is ferromagnetic hexagonal ferrite powder,
an intensity ratio Int(110)/Int(114) of a peak intensity Int(110) of a diffraction peak of a (110) plane with respect to a 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,
a vertical direction squareness ratio of the magnetic tape is 0.65 to 1.00,
a center line average surface roughness Ra measured regarding a surface of the magnetic layer is equal to or smaller than 2.0 nm,
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 center line average surface roughness Ra measured regarding the surface of the magnetic layer is 1.2 nm to 2.0 nm.

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

4. 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.

5. A magnetic reproducing method comprising:
reproducing information recorded on a magnetic tape by a reproducing head,
wherein 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 ferromagnetic powder is ferromagnetic hexagonal ferrite powder,
an intensity ratio Int(110)/Int(114) of a peak intensity Int(110) of a diffraction peak of a (110) plane with respect to a 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,
a vertical direction squareness ratio of the magnetic tape is 0.65 to 1.00,
a center line average surface roughness Ra measured regarding a surface of the magnetic layer is equal to or smaller than 2.0 nm,
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 %.

6. The magnetic reproducing method according to claim 5 ,
wherein the center line average surface roughness Ra measured regarding the surface of the magnetic layer is 1.2 nm to 2.0 nm.

7. The magnetic reproducing method according to claim 5 ,
wherein the vertical direction squareness ratio of the magnetic tape is 0.65 to 0.90.

8. The magnetic reproducing method according to claim 5 ,
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.

Assignees

• Fujifilm Corp

Inventors

• Kasada Norihito
• Ozawa Eiki

Classifications

• G11B5/82 Primary

  Disk carriers · CPC title

• G11B5/70678

  Ferrites · CPC title

• G11B5/70

  on a base layer · CPC title

• G11B5/00813

  magnetic tapes · CPC title

• G11B5/714 Primary

  characterised by the dimension of the magnetic particles · CPC title