Magnetic recording head and manufacturing method thereof, magnetic recording apparatus, and manufacturing method of magnetic recording medium

Patent metadata

Field	Value
Publication number	US-12087334-B2
Application number	US-202318188609-A
Country	US
Kind code	B2
Filing date	Mar 23, 2023
Priority date	Sep 25, 2020
Publication date	Sep 10, 2024
Grant date	Sep 10, 2024

Abstract

Provided are a magnetic recording heading having a magnetic film including a write gap, in which in the write gap, a recording surface-side gap width is narrower than a back surface-side gap width, and the write gap has an opening portion formed by ion beam processing at a gap end portion on a recording surface side, a magnetic recording apparatus including the magnetic recording head, a manufacturing method of the magnetic recording head, and a manufacturing method of a magnetic recording medium having a servo pattern, including forming a servo pattern on the magnetic recording medium by the magnetic recording head.

First claim

What is claimed is:

1. A magnetic recording head comprising:
a magnetic film including a write gap,
wherein in the write gap, a recording surface-side gap width is narrower than a back surface-side gap width,
the write gap has an opening portion at a gap end portion on a recording surface side,
the recording surface-side gap width of the write gap is 1.5 μm or less,
the back surface-side gap width of the write gap is 20.0 μm or less,
a thickness of the magnetic film is 1.0 μm or more,
the write gap includes a non-magnetic material portion at a gap end portion on a back surface side, and
a thickness of the non-magnetic material portion is 5% or more and 90% or less with respect to the thickness of the magnetic film.

2. The magnetic recording head according to claim 1 ,
wherein the magnetic recording head is a servo write head.

3. The magnetic recording head according to claim 1 ,
wherein the recording surface-side gap width of the write gap is 0.2 μm or more and 1.5 μm or less.

4. The magnetic recording head according to claim 1 ,
wherein the back surface-side gap width of the write gap is 2.0 μm or more and 20.0 μm or less.

5. The magnetic recording head according to claim 1 ,
wherein a thickness of the magnetic film is 1.0 μm or more and 10.0 μm or less.

6. The magnetic recording head according to claim 1 ,
wherein a non-magnetic material constituting the non-magnetic material portion is a silicon oxide.

7. The magnetic recording head according to claim 1 ,
wherein the magnetic film is an iron nitride-based alloy film.

8. A magnetic recording apparatus comprising:
the magnetic recording head according to claim 1 .

9. The magnetic recording apparatus according to claim 8 ,
wherein the magnetic recording apparatus is a servo writer.

10. A manufacturing method of the magnetic recording head according to claim 1 , comprising:
forming a non-magnetic material portion on a substrate;
forming a magnetic film to cover the non-magnetic material portion on the substrate; and
forming an opening portion by ion beam processing in a portion of the magnetic film in which a write gap is required to be formed,
wherein the portion to be subjected to ion beam processing has the non-magnetic material portion between the magnetic film and the substrate.

11. The manufacturing method of a magnetic recording head according to claim 10 ,
wherein the ion beam processing is focused ion beam processing.

12. A manufacturing method of a magnetic recording medium having a servo pattern, comprising:
forming a servo pattern on the magnetic recording medium by the magnetic recording head according to claim 1 .

13. The manufacturing method of a magnetic recording medium according to claim 12 ,
wherein the servo pattern is a timing-based servo pattern.

14. The manufacturing method of a magnetic recording medium according to claim 12 ,
wherein vertical coercivity of the magnetic recording medium is 2,800 Oe or more.

15. The manufacturing method of a magnetic recording medium according to claim 13 ,
wherein vertical coercivity of the magnetic recording medium is 2,800 Oe or more.

16. The magnetic recording head according to claim 1 ,
wherein the recording surface-side gap width of the write gap is 0.2 μm or more and 1.5 μm or less,
the back surface-side gap width of the write gap is 2.0 μm or more and 20.0 μm or less, and
a thickness of the magnetic film is 1.0 μm or more and 10.0 μm or less.

Assignees

• Fujifilm Corp

Inventors

• Kaneko Tetsuya
• NISHIMURA Kento

Classifications

• G11B5/584 Primary

  for track following on tapes · CPC title

• G11B5/23

  Gap features {(G11B5/1871, G11B5/1875, G11B5/265, G11B5/29, G11B5/488 and subgroups, G11B5/4907 and subgroups, G11B5/4969 and subgroups take precedence)} · CPC title

• G11B5/64

  comprising only the magnetic material without bonding agent · CPC title

• G11B5/70

  on a base layer · CPC title

• G11B5/3163 Primary

  Fabrication methods or processes specially adapted for a particular head structure, e.g. using base layers for electroplating, using functional layers for masking, using energy or particle beams for shaping the structure or modifying the properties of the basic layers · CPC title