Data writer with flux density insert

Patent metadata

Field	Value
Publication number	US-9343085-B2
Application number	US-201514938585-A
Country	US
Kind code	B2
Filing date	Nov 11, 2015
Priority date	Jun 28, 2013
Publication date	May 17, 2016
Grant date	May 17, 2016

Abstract

A data writer may be generally configured at least with a write pole adjacent to and separated from a side shield and a trailing shield. The side shield may be formed of a first material and configured with a trailing box region that is at least partially filled with a flux density insert formed of a second material that is different than the first material.

First claim

What is claimed is:

1. An apparatus comprising a write pole adjacent to and separated from a side shield comprising a first magnetic material and configured with a trailing box region defined by a reduced thickness notch in the side shield, a vertical lamination of first and second layers contained in the trailing box region, the first layer comprising a second material and the second layer comprising a third material, the first, second, and third materials having different saturation flux densities.

2. The apparatus of claim 1 , wherein the vertical lamination further comprises third and fourth layers.

3. The apparatus of claim 2 , wherein the third layer comprises a fourth material and the fourth layer comprises a fifth material, the first, second, third, fourth, and fifth materials each having different saturation flux densities.

4. The apparatus of claim 3 , wherein the first material has a greater saturation flux density than the second, third, fourth, and fifth materials, the second material has a greater saturation flux density than the third, fourth, and fifth materials, the third material has a greater saturation flux density than the fourth and fifth materials, and the fourth material has a greater saturation flux density than the fifth material.

5. The apparatus of claim 3 , wherein the second material is position proximal the write pole and the fifth material is positioned distal to the write pole.

6. The apparatus of claim 3 , wherein the fifth material is positioned proximal the write pole and the second material is positioned distal the write pole.

7. The apparatus of claim 1 , wherein the trailing box region extends from a downtrack position to an uptrack plane parallel with a trailing edge of the write pole.

8. The apparatus of claim 7 , wherein the uptrack plane is positioned between a leading tip of the write pole and the trailing edge of the write pole.

9. The apparatus of claim 1 , wherein the vertical lamination contacts the side shield and a trailing shield.

10. An apparatus comprising a write pole separated from and disposed between first and second side shields, the first and second side shields each comprising a first magnetic material and configured with a trailing box region defined by a reduced thickness notch in the respective side shields, each trailing box region is filled with a vertical lamination of first and second layers contained in the trailing box region, the first layer comprising a second material and the second layer comprising a third material, the first, second, and third materials having different saturation flux densities.

11. The apparatus of claim 10 , wherein the vertical laminations of the first and second side shields are physically separated by a non-magnetic gap material and the write pole.

12. The apparatus of claim 10 , wherein the first and second shields are symmetric about a longitudinal axis of the write pole.

13. The apparatus of claim 10 , wherein each vertical lamination and side shield form an asymmetric shield.

14. The apparatus of claim 10 , wherein each vertical lamination has a lower saturation flux density than the first or second side shields and a higher saturation flux density than a non-magnetic gap material that surrounds the write pole.

15. The apparatus of claim 10 , wherein the side shields do not physically touch and are separated by a non-magnetic gap material.

16. The apparatus of claim 10 , wherein each side shield contacts a trailing shield adjacent to the respective trailing box regions.

17. An apparatus comprising a write pole adjacent to and separated from a first side shield and a trailing shield, the first side shield comprising a first magnetic material and configured with a trailing box region defined by a reduced thickness notch in the side shield, a vertical lamination of first and second layers contained in the trailing box region, each layer extending from a non-magnetic material to a trailing box sidewall along a direction perpendicular to a longitudinal axis of the write pole, the first layer comprising a second material and the second layer comprising a third material, the first, second, and third materials having different saturation flux densities.

18. The apparatus of claim 17 , wherein the side shield sidewall is oriented at a non-zero angle with respect to the longitudinal axis of the write pole.

19. The apparatus of claim 18 , wherein each layer of the vertical lamination has a tapered edge oriented parallel to the side shield sidewall.

Assignees

• Seagate Technology Llc

Inventors

• Basu Swaraj
• Gubbins Mark
• Bashir Muhammad Asif
• Gangmei Prim

Classifications

• G11B5/11 Primary

  Shielding of head against electric or magnetic fields · CPC title

• G11B5/112

  Manufacture of shielding device · CPC title

• G11B5/3143

  including additional layers for improving the electromagnetic transducing properties of the basic structure, e.g. for flux coupling, guiding or shielding (G11B5/3116, G11B5/312 take precedence) · CPC title

• G11B5/1278

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