Data writer front shield with varying throat height

Patent metadata

Field	Value
Publication number	US-9601136-B2
Application number	US-201615132876-A
Country	US
Kind code	B2
Filing date	Apr 19, 2016
Priority date	Feb 27, 2015
Publication date	Mar 21, 2017
Grant date	Mar 21, 2017

Abstract

A data storage device employing a data writer may configure the data writer with at least a write pole that is separated from a front shield on an air bearing surface. The front shield can be arranged to continuously extend from the air bearing surface a first throat height distal the write pole and a second throat height proximal the write pole with the first and second throat heights being different.

First claim

What is claimed is:

1. An apparatus comprising a write pole disposed between first and second side shields and positioned uptrack from a front shield on an air bearing surface (ABS), the front shield continuously extending from the first side shield to the second side shield with a varying throat height that defines a shaped notch proximal a write pole tip of the write pole, the shaped notch separated from the ABS and having a first shield sidewall overlapping a first body sidewall of the write pole and a second shield sidewall overlapping a second body sidewall of the write pole, the first and second shield sidewalls each respectively overlapping only one body sidewall of the write pole.

2. The apparatus of claim 1 , wherein the first shield sidewall continuously extends from a first throat height to a second throat height.

3. The apparatus of claim 1 , wherein the first shield sidewall is oriented perpendicular to the ABS while overlapping the first body sidewall.

4. The apparatus of claim 1 , wherein the first shield sidewall has a different shape than the first body sidewall of the write pole.

5. The apparatus of claim 4 , wherein the first body sidewall connects a body portion of the write pole with the write pole tip.

6. The apparatus of claim 4 , wherein the pole first body sidewall defines a body portion of the write pole.

7. The apparatus of claim 1 , wherein the second shield sidewall overlaps a different body sidewall of the write pole than the first shield sidewall.

8. The apparatus of claim 7 , wherein the first and second shield sidewalls are connected by a tip surface that is oriented parallel to the ABS.

9. The apparatus of claim 8 , wherein the tip surface continuously extends to opposite sides of the write pole tip.

10. The apparatus of claim 8 , wherein the tip surface crosses first and second non-magnetic gap regions between the write pole and the respective side shields.

11. An apparatus comprising a write pole disposed between first and second side shields and positioned uptrack from a front shield on an air bearing surface (ABS), the front shield continuously extending from the first side shield to the second side shield with a varying throat height that defines a shaped notch proximal a write pole tip of the write pole, the shaped notch aligned with a longitudinal axis of the write pole, separated from the ABS, and having first and second shield sidewalls respectively overlapping different first and second body sidewalls of the write pole, the first and second shield sidewalls each oriented perpendicular to the ABS when overlapping the respective first and second body sidewalls.

12. The apparatus of claim 11 , wherein the first shield sidewall crosses a non-magnetic gap between the write pole and first side shield.

13. The apparatus of claim 11 , wherein the notch has a first width that is greater than a second width of the write pole tip and smaller than a third width of the write pole between the first and second body sidewalls.

14. The apparatus of claim 11 , wherein the second shield sidewall is curvilinear.

15. The apparatus of claim 14 , wherein the first shield sidewall is connected to the second shield sidewall by a linear shoulder sidewall oriented parallel to the ABS.

16. The apparatus of claim 11 , wherein the first shield sidewall extends from the first side shield to a body portion of the write pole.

17. An apparatus comprising a write pole disposed between first and second side shields and positioned uptrack from a front shield on an air bearing surface (ABS), the front shield continuously extending from the first side shield to the second side shield with a first throat height uptrack from a write pole tip of the write pole and a second throat height uptrack from the first side shield, the first and second throat heights each extending from the ABS to define a shaped notch proximal the write pole tip of the write pole, the shaped notch separated from the ABS and having a first shield sidewall overlapping a first body sidewall of the write pole and a second shield sidewall overlapping a second body sidewall of the write pole, the first and second sidewalls each being continuously linear, oriented perpendicular to the ABS, and overlapping only one body sidewall of the write pole.

18. The apparatus of claim 17 , wherein the first throat height is present uptrack from the second side shield.

19. The apparatus of claim 17 , wherein the first side shield has a side shield sidewall that faces the write pole and has a matching shape as a pole sidewall of the write pole tip.

20. The apparatus of claim 19 , wherein the shield and pole sidewalls have a different shape than the first shield sidewall.

Assignees

• Seagate Technology Llc

Inventors

• Bashir Muhammad Asif
• Xue Jianhua
• Mcconnell Beverley R
• Liao Shengzhou
• Tian Wei
• Gangmei Prim
• Basu Swaraj
• Gubbins Mark A

Classifications

• G11B5/10

  Structure or manufacture of housings or shields for heads · CPC title

• G11B5/315 Primary

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

• G11B5/3116

  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 title