Magnetic recording medium having characterized magnetic layer and magnetic recording and reproducing device

Patent metadata

Field	Value
Publication number	US-11423933-B2
Application number	US-202017022886-A
Country	US
Kind code	B2
Filing date	Sep 16, 2020
Priority date	Sep 19, 2019
Publication date	Aug 23, 2022
Grant date	Aug 23, 2022

Abstract

The magnetic recording medium includes a non-magnetic support; and a magnetic layer including a ferromagnetic powder, in which one or more kinds of component selected from the group consisting of a fatty acid and a fatty acid amide are included in a portion of the magnetic layer side on the non-magnetic support, and a C—H derived C concentration calculated from a C—H peak surface area ratio in C1s spectra obtained by X-ray photoelectron spectroscopic analysis performed on a surface of the magnetic layer at a photoelectron take-off angle of 10 degrees, after pressing the magnetic layer at a pressure of 70 atm is 45 atom % or more.

First claim

What is claimed is:

1. A magnetic recording medium comprising:
a non-magnetic support; and
a magnetic layer including a ferromagnetic powder,
wherein one or more kinds of component selected from the group consisting of a fatty acid and a fatty acid amide are included in a portion of the magnetic layer side on the non-magnetic support, and
a C—H derived C concentration calculated from a C—H peak surface area ratio in C1s spectra obtained by X-ray photoelectron spectroscopic analysis performed on a surface of the magnetic layer at a photoelectron take-off angle of 10 degrees, after pressing the magnetic layer at a pressure of 70 atm is 45 atom % or more.

2. The magnetic recording medium according to claim 1 ,
wherein the C—H derived C concentration may be 45 atom % to 80 atom %.

3. The magnetic recording medium according to claim 1 ,
wherein the magnetic layer includes inorganic oxide-based particles.

4. The magnetic recording medium according to claim 3 ,
wherein the inorganic oxide-based particles are composite particles of an inorganic oxide and a polymer.

5. The magnetic recording medium according to claim 1 , further comprising:
a non-magnetic layer including a non-magnetic powder between the non-magnetic support and the magnetic layer.

6. The magnetic recording medium according to claim 1 , further comprising:
a back coating layer including a non-magnetic powder on a surface of the non-magnetic support opposite to a surface provided with the magnetic layer.

7. The magnetic recording medium according to claim 1 ,
wherein the magnetic recording medium is a magnetic tape.

8. A magnetic recording and reproducing device comprising:
a magnetic recording medium; and
a magnetic head,
wherein the magnetic recording medium is a magnetic recording medium comprising:
a non-magnetic support; and
a magnetic layer including a ferromagnetic powder,
wherein one or more kinds of component selected from the group consisting of a fatty acid and a fatty acid amide are included in a portion of the magnetic layer side on the non-magnetic support, and
a C—H derived C concentration calculated from a C—H peak surface area ratio in C1s spectra obtained by X-ray photoelectron spectroscopic analysis performed on a surface of the magnetic layer at a photoelectron take-off angle of 10 degrees, after pressing the magnetic layer at a pressure of 70 atm is 45 atom % or more.

9. The magnetic recording and reproducing device according to claim 8 ,
wherein the C—H derived C concentration may be 45 atom % to 80 atom %.

10. The magnetic recording and reproducing device according to claim 8 ,
wherein the magnetic layer includes inorganic oxide-based particles.

11. The magnetic recording and reproducing device according to claim 10 ,
wherein the inorganic oxide-based particles are composite particles of an inorganic oxide and a polymer.

12. The magnetic recording and reproducing device according to claim 8 ,
wherein the magnetic recording medium further comprises a non-magnetic layer including a non-magnetic powder between the non-magnetic support and the magnetic layer.

13. The magnetic recording and reproducing device according to claim 8 ,
wherein the magnetic recording medium further comprises a back coating layer including a non-magnetic powder on a surface of the non-magnetic support opposite to a surface provided with the magnetic layer.

14. The magnetic recording and reproducing device according to claim 8 ,
wherein the magnetic recording medium is a magnetic tape.

Assignees

• Fujifilm Corp

Inventors

• Nakano Megumi
• Ozawa Eiki
• Kasada Norihito

Classifications

• G11B5/733

  characterised by the addition of non-magnetic particles {(base layers having a non-magnetic layer under a soft magnetic layer G11B5/736; magnetic recording media substrates G11B5/739)} · CPC title

• G11B5/00813

  magnetic tapes · CPC title

• G11B5/73925

  Composite or coated non-esterified substrates · CPC title

• G11B5/71 Primary

  characterised by the lubricant · CPC title

• G11B5/70626 Primary

  containing non-metallic substances · CPC title