Varying data writer side shield gap distal the ABS

Patent metadata

Field	Value
Publication number	US-9437220-B2
Application number	US-201314036698-A
Country	US
Kind code	B2
Filing date	Sep 25, 2013
Priority date	Sep 25, 2013
Publication date	Sep 6, 2016
Grant date	Sep 6, 2016

Abstract

A data writing element may be configured at least with a write pole positioned adjacent a first shield along a first axis and adjacent a second shield along a second axis. The second shield may be separated from the write pole by a first gap distance on an air bearing surface (ABS) and by a second gap distance distal the ABS with the first and second gap distances meeting at a transition surface oriented parallel to the ABS.

First claim

What is claimed is:

1. An apparatus comprising a write pole adjacent a side shield along a first axis, the side shield having first and second shield sub-layers having different magnetic flux densities and contacting at a first transition surface oriented parallel to an air bearing surface (ABS), the first transition surface separating the first shield sub-layer from the second shield sub-layer, the second sub-layer being separated from the ABS and comprising a lower magnetic flux density than the first shield sub-layer.

2. The apparatus of claim 1 , wherein a trailing shield is separated from the write pole along a second axis and is positioned downtrack from the write pole.

3. The apparatus of claim 2 , wherein the side shield is positioned laterally adjacent the write pole and uptrack from the trailing shield.

4. The apparatus of claim 3 , wherein the write pole is disposed between matching side shields.

5. The apparatus of claim 1 , wherein the write pole comprises a first sidewall extending from the ABS with a first shape, the side shield comprising a second sidewall extending from the ABS with a second shape, the first and second shapes being different.

6. The apparatus of claim 1 , wherein the side shield comprises a second transition surface oriented parallel to the ABS, the first and second transition surfaces separated from the ABS by different distances.

7. The apparatus of claim 6 , wherein the first and second transition surfaces have different lengths as measured parallel to the ABS.

8. The apparatus of claim 1 , wherein the first transition surface is continuously linear.

9. A magnetic element comprising a write pole adjacent a side shield along a first axis, the side shield configured as a horizontal lamination with first, second, and third shield sub-layers having different magnetic flux densities meeting at a first transition surface oriented parallel to the air bearing surface (ABS), the first and second shield sub-layers each contacting the ABS, the third shield sub-layer separated from the ABS by the first shield sub-layer.

10. The magnetic element of claim 9 , wherein the first and second sub-layers continuously extend from the ABS.

11. The magnetic element of claim 9 , wherein the first sub-layer comprises the first transition surface and the second sub-layer comprises a second transition surface oriented parallel to the ABS.

12. The magnetic element of claim 11 , wherein the first and second transition surfaces are positioned at different distances from the ABS.

13. The magnetic element of claim 11 , wherein the first and second transition surfaces are positioned at a common distance from the ABS.

14. The magnetic element of claim 9 , wherein the first sub-layer has a greater magnetic flux density than the second and third sub-layers.

15. The magnetic element of claim 9 , wherein the first sub-layer extends no farther than the first transition surface in a direction perpendicular to the ABS.

16. The magnetic element of claim 11 , wherein the side shield comprises a third sub-layer that continuously extends from the second transition surface without contacting the ABS.

17. The magnetic element of claim 16 , wherein the side shield comprises a fourth sub-layer that continuously extends from the first transition surface without contacting the ABS.

18. The magnetic element of claim 16 , wherein the side shield comprises a fourth sub-layer that has a different magnetic moment than the first sub-layer.

19. The magnetic element of claim 9 , wherein the first sub-layer comprises a write pole facing sidewall configured with a matching shape as a side shield facing sidewall of the write pole.

20. A method comprising:
positioning a write pole adjacent a side shield along a first axis, the side shield comprising first and second sub-layers having different magnetic flux densities; and
configuring the first and second sub-layers to contact at a transition surface oriented parallel to the ABS, the transition surface separating the first shield sub-layer from the second shield sub-layer, the second sub-layer being separated from the ABS and comprising a lower magnetic flux density than the first shield sub-layer.

Assignees

• Seagate Technology Llc

Inventors

• Bashir Muhammad Asif
• Gubbins Mark
• Basu Swaraj
• Mooney Marcus B

Classifications

• G11B5/3116 Primary

  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 title