Data writer with laminated front shield

Patent metadata

Field	Value
Publication number	US-9899042-B1
Application number	US-201615018311-A
Country	US
Kind code	B1
Filing date	Feb 8, 2016
Priority date	Feb 8, 2016
Publication date	Feb 20, 2018
Grant date	Feb 20, 2018

Abstract

A data storage device data writer may arrange a write pole to be positioned uptrack from a front shield on an air bearing surface. The front shield can consist of a lamination of a first magnetic alloy material and a second magnetic alloy material. The second magnetic alloy material may be NiFe that has 80% iron by weight.

First claim

What is claimed is:

1. An apparatus comprising a write pole positioned uptrack from a front shield on an air bearing surface (ABS), the front shield comprising a lamination of first and second magnetic alloys, the second magnetic alloy comprising NiFe with 80% iron by weight, the front shield disposed between and in contact with first and second side shields each side shield continuously extending from the front shield to a position uptrack from a leading edge of the write pole.

2. The apparatus of claim 1 , wherein the first magnetic alloy comprises CoFe.

3. The apparatus of claim 1 , wherein the first magnetic alloy is disposed between and contacts both a non-magnetic material and the second magnetic alloy.

4. The apparatus of claim 1 , wherein the lamination has a magnetic moment of 2.2-2.3 T.

5. The apparatus of claim 1 , wherein the first magnetic alloy has a thickness of 30 nm, the thickness measured parallel to a longitudinal axis of the write pole on the ABS.

6. The apparatus of claim 1 , wherein the second magnetic alloy has a thickness of 30 nm, the thickness measured parallel to a longitudinal axis of the write pole on the ABS.

7. The apparatus of claim 1 , wherein the front shield contacts a trailing edge of the write pole.

8. The apparatus of claim 1 , wherein the front shield is disposed between and contacts opposite sides of a letterbox region defined by the first and second side shields.

9. The apparatus of claim 1 , wherein the first and second magnetic alloys respectively have uniform thicknesses that continuously extend from the first side shield to the second side shield.

10. An apparatus comprising a write pole positioned uptrack from a front shield on an air bearing surface (ABS), the front shield comprising a lamination of a first magnetic alloy and a second magnetic alloy, the second magnetic alloy comprising NiFe with 80% iron by weight, a third magnetic ally continuously extends from a first side of the front shield to an opposite second side of the front shield to concurrently contact first and second side shields and the front shield on the ABS, the front shield separated from the write pole by a cap lamination and separated from a leading surface of a letterbox region by a non-magnetic region.

11. The apparatus of claim 10 , wherein a transition metal material of the cap lamination has a thickness of 1 nm, the thickness measured parallel to a longitudinal axis of the write pole on the ABS.

12. The apparatus of claim 10 , wherein the third magnetic alloy comprises a NiFe material with 80% iron by weight.

13. The apparatus of claim 10 , wherein the third magnetic alloy has a varying thickness proximal the front shield, the thickness measured parallel to a longitudinal axis of the write pole on the ABS.

14. The apparatus of claim 10 , wherein the front shield is wider than the write pole on the ABS, the width of the front shield measured perpendicular to a longitudinal axis of the write pole.

15. An apparatus comprising a write pole separated from a front shield by a cap lamination on an air bearing surface (ABS), the front shield positioned downtrack of the write pole and comprises a shield lamination of a first magnetic alloy and a second magnetic alloy, the second magnetic alloy comprising NiFe with 80% iron by weight, the cap lamination contacting the write pole and a first surface of a letterbox region of a side shield, the cap lamination separated from a leading surface of the letterbox region by a non-magnetic region.

16. The apparatus of claim 15 , wherein the cap lamination comprises first and second non-magnetic layers.

17. The apparatus of claim 16 , wherein the first non-magnetic layer comprises a transition metal material and the second non-magnetic layer comprises Alumina.

18. The apparatus of claim 16 , wherein the first and second non-magnetic layers each have uniform thicknesses on the ABS, the respective thicknesses being different and each measured parallel to a longitudinal axis of the write pole.

19. The apparatus of claim 16 , wherein the first and second non-magnetic layers comprise different materials.

Assignees

• Seagate Technology Llc

Inventors

• Venugopal Vijayaharan A
• Bashir Muhammad Asif
• Mcgeehin Peter
• Mooney Marcus B
• Gubbins Mark

Classifications

• G11B5/1278

  specially adapted for magnetisations perpendicular to the surface of the record carrier · CPC title

• G11B5/315 Primary

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

• G11B5/11

  Shielding of head against electric or magnetic fields · CPC title

• G11B5/235

  Selection of material for gap filler {(G11B5/232 takes precedence)} · CPC title

• G11B5/3146

  magnetic layers · CPC title