Magnetic tape having characterized magnetic layer and magnetic tape device

Patent metadata

Field	Value
Publication number	US-10770105-B2
Application number	US-201816038514-A
Country	US
Kind code	B2
Filing date	Jul 18, 2018
Priority date	Jul 19, 2017
Publication date	Sep 8, 2020
Grant date	Sep 8, 2020

Abstract

The magnetic tape includes: a non-magnetic support; a non-magnetic layer including non-magnetic powder and a binding agent on the non-magnetic support; and a magnetic layer including ferromagnetic powder and a binding agent on the non-magnetic layer, in which a total thickness of the non-magnetic layer and the magnetic layer is equal to or smaller than 0.60 μm, the magnetic layer has a servo pattern, 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;
a non-magnetic layer including non-magnetic powder and a binding agent on the non-magnetic support; and
a magnetic layer including ferromagnetic powder and a binding agent on the non-magnetic layer,
wherein a total thickness of the non-magnetic layer and the magnetic layer is equal to or smaller than 0.60 μm,
the magnetic layer has a servo pattern,
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, and
a 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 total thickness of the non-magnetic layer and the magnetic layer is 0.20 μm to 0.60 μm.

4. 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.

5. 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.

6. 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 binding agent on the non-magnetic support; and
a magnetic layer including ferromagnetic powder and a binding agent on the non-magnetic layer,
wherein a total thickness of the non-magnetic layer and the magnetic layer is equal to or smaller than 0.60 μm,
the magnetic layer has a servo pattern,
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, and
a vertical direction squareness ratio of the magnetic tape is 0.65 to 1.00.

7. The magnetic tape device according to claim 6 ,
wherein the vertical direction squareness ratio of the magnetic tape is 0.65 to 0.90.

8. The magnetic tape device according to claim 6 ,
wherein the total thickness of the non-magnetic layer and the magnetic layer is 0.20 μm to 0.60 μm.

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

10. The magnetic tape device according to claim 6 ,
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

• H01F1/113

  in a bonding agent · CPC title

• G11B5/70

  on a base layer · CPC title

• H01F1/348

  Hexaferrites with decreased hardness or anisotropy, i.e. with increased permeability in the microwave (GHz) range, e.g. having a hexagonal crystallographic structure · CPC title

• G11B5/708

  characterised by addition of non-magnetic particles to the layer · CPC title

• G11B5/702

  characterised by the bonding agent · CPC title