Dual writer design in interlaced magnetic recording

• US 9,805,744 B1
• Filed: 04/01/2016
• Issued: 10/31/2017
• Est. Priority Date: 04/01/2016
• Status: Active Grant

• Current Assignee: Seagate Technology LLC (Seagate Technology Holdings Plc)
• Original Assignee: Seagate Technology LLC (Seagate Technology Holdings Plc)
• Inventors: Xue, Jianhua, Zhong, Jian, Lu, Lei, Dong, Yan, Rivkin, Kirill
• Primary Examiner(s): Miller, Brian
• Application Number:
  US15/088,752
• Time in Patent Office: 578 Days
• CPC Class Codes: G11B 5/012 Recording on, or reproducing or erasing from, magnetic disks G11B17/00, G11B19/00 take precedence
• CPC Class Codes: G11B 5/1278 specially adapted for magnetisations perpendicular to the surface of the record carrier
• CPC Class Codes: G11B 5/23 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 Class Codes: G11B 5/29 Structure or manufacture of unitary devices formed of plural heads for more than one track G11B5/33, G11B5/49 and subgroups take precedence; in thin film structure G11B5/31
• CPC Class Codes: G11B 5/3116 Shaping of layers, poles or gaps for improving the form of the electrical signal transduced, e.g. for shielding, contour effect, equalizing, side flux fringing, cross talk reduction between heads or between heads and information tracks G11B5/3113, G11B5/245 take precedence
• CPC Class Codes: G11B 5/315 Shield layers on both sides of the main pole, e.g. in perpendicular magnetic heads
• CPC Class Codes: G11B 5/4886 relative to rotating disc

Abstract

The disclosed technology includes a storage device including an interlaced magnetic recording (IMR) system, and a transducer head, including two writers, each writer including a write pole, wherein a width of a first write pole in a cross-track direction is substantially greater than a width of a second write pole in the cross-track direction, and wherein a down-track width of a front shield gap of the first write pole is substantially similar to down-track width of a front shield gap of the second write pole. In another implementation, the storage device includes an IMR system, and a transducer head, including two writers, each writer including a write pole, wherein a width of the first write pole in a cross-track direction is substantially greater than a width of a second write pole in a cross-track direction, and wherein a cross-track width of a side shield gap of the first write pole is substantially similar to a cross-track width of a side shield gap of the second write pole.

Claims

1. A storage device comprising:

an interlaced magnetic recording system; and

a transducer head, including two writers, each writer including a write pole, wherein a width of a first write pole in a cross-track direction is substantially greater than a width of a second write pole in the cross-track direction, and wherein a down-track width of a front shield gap of the first write pole is substantially similar to a down-track width of a front shield gap of the second write pole.

2. The storage device of claim 1, wherein cross-track widths of side shield gaps of the first write pole are substantially similar to cross-track widths of side shield gaps of the second write pole.

3. The storage device of claim 1, wherein the two writers have a box side shield design.

4. The storage device of claim 1, wherein the first write pole and the second write pole are co-planar.

5. The storage device of claim 1, wherein the width of the first write pole in a cross-track direction is 1.5-2.0 times the width of the second write pole in a cross-track direction.

6. A storage device comprising:

an interlaced magnetic recording system; and

a transducer head, including two writers, each writer including a write pole, wherein a width of a first write pole in a cross-track direction is substantially greater than a width of a second write pole in a cross-track direction, and wherein a cross-track width of a side shield gap of the first write pole is substantially similar to a cross-track width of a side shield gap of the second write pole.

7. The storage device of claim 6, wherein a down-track length of a break point of a paddle-shaped surface of the writer with the wider first write pole is substantially lesser than a down-track length of a break point of a paddle-shaped surface of the writer with the narrower second write pole.

8. The storage device of claim 6, wherein the paddle-shaped surface of the writer with the wider first write pole has no break point.

9. The storage device of claim 6, wherein the width of the first write pole in the cross-track direction is approximately 1.5-2.0 times the width of the second write pole in the cross-track direction.

10. The storage device of claim 6, wherein the two write poles are co-planar.

11. The storage device of claim 6, wherein the writer with the wider first write pole has no side shields.

12. A transducer head comprising:

a first writer including a first write pole; and

a second writer including a second write pole, wherein a width of the first write pole in a cross-track direction is greater than a width of the second write pole in the cross-track direction, wherein the first write pole and the second write pole are co-planar, and wherein a down-track width of a front shield gap of the first write pole and a down-track width of a front shield gap of the second write pole are substantially similar.

13. The transducer head of claim 12, wherein the first write pole has no side shields.

14. The transducer head of claim 12, wherein and a cross-track width of a side shield gap of the first write pole and a cross-track width of a side shield gap of the second write pole are substantially similar.

15. The transducer head of claim 12, wherein a down-track width of a front shield gap of the first write pole and a down-track width of a front shield gap of the second write pole are substantially different and a cross-track width of a side shield gap of the first write pole and a cross-track width of a side shield gap of the second write pole are substantially different.

16. The transducer head of claim 12, wherein surfaces of the first write pole and the second write pole are paddle-shaped and have side shield gaps of a different size.

17. The transducer head of claim 12, wherein the second writer has side shields and a break point, and the first writer does not have side shields and has a break point.

18. The transducer head of claim 12, wherein the second writer has side shields and a break point, and the first writer does not have side shields and does not have a break point.

19. The transducer head of claim 12, wherein the second writer has side shields and a break point, and the first writer has side shields and does not have a break point.