Dual writer for advanced magnetic recording

Patent metadata

Field	Value
Publication number	US-11430469-B2
Application number	US-202117463368-A
Country	US
Kind code	B2
Filing date	Aug 31, 2021
Priority date	Nov 25, 2019
Publication date	Aug 30, 2022
Grant date	Aug 30, 2022

Abstract

The present disclosure generally relates to a magnetic media drive employing a magnetic recording head. The magnetic recording head comprises a first write head, a second write head, at least one read head, and a thermal fly height control element. The first write head is a wide writing write head comprising a first main pole and a first trailing shield. The second write head a narrow writing write head comprising a second main pole, a trailing gap, a second trailing shield, and one or more side shields. The first main pole has a shorter height and a greater width than the second main pole. The second main pole has a curved or U-shaped surface disposed adjacent to the trailing gap. The thermal fly height control element and the at least one read head are aligned with a center axis of the second main pole of the second write head.

First claim

What is claimed is:

1. A magnetic recording head, comprising:
a first write head, comprising:
a first main pole;
a first trailing shield disposed adjacent to the first main pole; and
a first seed layer surrounding two or more sides of the first main pole,

the first seed layer having a first thickness; and
a second write head disposed adjacent to the first write head, comprising:
a second main pole;
a second trailing shield disposed adjacent to the second main pole;
a second seed layer surrounding two or more sides of the second main pole, the second seed layer having a second thickness less than the first thickness of the first seed layer; and
one or more side shields surrounding two or more surfaces of the second main pole.

2. The magnetic recording head of claim 1 , wherein the first and second seed layers comprise ruthenium, and wherein a first trailing gap of the first write head has a different width than a second trailing gap of the second write head.

3. The magnetic recording head of claim 1 , wherein the first main pole has a shorter height from a trailing edge of the first main pole to a leading edge of the first main pole than the second main pole.

4. A data storage device comprising the magnetic recording head of claim 1 .

5. The data storage device of claim 4 , wherein a write width of the first write head is wider than that of the second write head.

6. The data storage device of claim 5 , further comprising a controller configured to:
cause the first write head to first write one or more even tracks or one or more odd tracks of a media, and
cause the second write head to subsequently write tracks of the media not written by the first write head.

7. The data storage device of claim 6 , wherein the write of the tracks of the media written by the second write head trims edges of the tracks written by the first write head.

8. A magnetic recording head, comprising:
a first write head, comprising:
a first main pole;
a first seed layer surrounding at least two sides of the first main pole and having a first height from a trailing edge of the first main pole to a leading edge of the first main pole; and
a first trailing shield disposed adjacent to the first main pole;

a second write head disposed adjacent to the first write head, comprising:
a second main pole;
a second seed layer surrounding at least two sides of the second main pole and having a second height from a trailing edge of the second main pole to a leading edge of the second main pole, wherein the first height is shorter than the second height; and
a second trailing shield disposed adjacent to the second main pole; and
one or more side shields surrounding two or more surfaces of the second main pole;

one or more read heads, wherein a first read head of the one or more read heads is aligned with the second main pole of the second write head; and
a thermal fly height control element aligned with the second main pole of the second write head and the first read head.

9. The magnetic recording head of claim 8 , wherein a write width of the first write head is wider than that of the second write head.

10. The magnetic recording head of claim 8 , wherein the thermal fly height control element is disposed between the second main pole and the first read head.

11. The magnetic recording head of claim 8 , wherein the first write head and the second write head are vertically stacked and disposed in a stacked formation.

12. The magnetic recording head of claim 8 , wherein the first write head is disposed adjacent to the second write head in a cross-the-track direction in a side-by-side formation.

13. The magnetic recording head of claim 8 , wherein a second read head of the one or more read heads is offset from the second main pole in a direction towards the first main pole.

14. A data storage device comprising the magnetic recording head of claim 8 .

15. A magnetic recording head, comprising:
a first write head, comprising:
a first main pole;
a first trailing shield disposed adjacent to the first main pole; and
a first seed layer surrounding two or more sides of the first main pole, the first seed layer having a first thickness, the first seed layer having a first height from a trailing edge of the first main pole to a leading edge of the first main pole; and

a second write head disposed adjacent to the first write head, comprising:
a second main pole;
a second trailing shield disposed adjacent to the second main pole;
a second seed layer surrounding two or more sides of the second main pole, the second seed layer having a second thickness less than the first thickness of the first seed layer, the second seed layer having a second height from a trailing edge of the second main pole to a leading edge of the second main pole; and
one or more side shields surrounding two or more surfaces of the second main pole.

16. The magnetic recording head of claim 15 , further comprising one or more read heads.

17. The magnetic recording head of claim 15 , further comprising a thermal fly height element.

18. The magnetic recording head of claim 15 , wherein the first write head and the second write head are disposed adjacent one another in a cross-the-track direction.

19. The magnetic recording head of claim 15 , wherein the first write head and the second write head are vertically aligned with a thermal fly height element.

20. A data storage device comprising the magnetic recording head of claim 15 .

Assignees

• Western Digital Tech Inc

Inventors

• Nguyen Thao A
• Ho Michael Kuok San
• Bai Zhigang
• Li Zhanjie
• Le Quang

Classifications

• G11B5/1871

  Shaping or contouring of the transducing or guiding surface · CPC title

• G11B5/315

  Shield layers on both sides of the main pole, e.g. in perpendicular magnetic heads · CPC title

• G11B5/265 Primary

  Structure or manufacture of a head with more than one gap for erasing, recording or reproducing on the same track (G11B5/33 takes precedence {in thin film structures G11B5/31}) · CPC title

• G11B5/11

  Shielding of head against electric or magnetic fields · CPC title

• G11B5/6005

  Specially adapted for spacing from a rotating disc using a fluid cushion · CPC title