Enhanced write pole and return pole for improved areal density

Patent metadata

Field	Value
Publication number	US-9805753-B2
Application number	US-201615078963-A
Country	US
Kind code	B2
Filing date	Mar 23, 2016
Priority date	Mar 23, 2016
Publication date	Oct 31, 2017
Grant date	Oct 31, 2017

Abstract

A system, according to one embodiment, includes: a main pole; and a trailing shield. A first distance D 1 is defined in a track direction between the trailing shield and a pole tip region of the main pole; and a second distance D 2 is defined in the track direction between the trailing shield and a second region of the main pole located behind the pole tip region, where D 2 is greater than D 1 . Other systems, and methods are described in additional embodiments.

First claim

What is claimed is:

1. A system, comprising:
a main pole;
a trailing shield; and
a lower bump on the main pole between the main pole and a leading shield, the lower bump comprising a magnetic material,
wherein a first distance D 1 is defined in a track direction between the trailing shield and a pole tip region of the main pole;
wherein a second distance D 2 is defined in the track direction between the trailing shield and a second region of the main pole located behind the pole tip region,
wherein D 2 is greater than D 1 .

2. The system as recited in claim 1 , wherein a third distance D 3 is defined in the track direction in a side gap between the trailing shield and a plane extending along an upper surface of the second region of the main pole, wherein D 3 is less than D 2 .

3. The system as recited in claim 2 , wherein D 3 is greater than D 1 .

4. The system as recited in claim 2 , wherein D 3 is substantially the same as D 1 .

5. The system as recited in claim 1 , further comprising an upper bump on the main pole between the main pole and the trailing shield, the upper bump comprising a magnetic material.

6. The system as recited in claim 1 , wherein the lower bump tapers in the track direction toward a media facing side thereof.

7. The system as recited in claim 6 , wherein an average angle of the tapering is between about 10 and about 21 degrees.

8. The system as recited in claim 1 , wherein the lower bump tapers less therealong toward a media facing side thereof than the main pole directly thereover tapers.

9. The system as recited in claim 1 , wherein sidewalls of the lower bump positioned opposite each other in a cross-track direction form a relatively smaller angle than an angle formed by sidewalls of the main pole positioned opposite each other in the cross-track direction.

10. A magnetic data storage system, comprising:
at least one magnetic head having the main pole as recited in claim 1 ;
a magnetic medium;
a drive mechanism for passing the magnetic medium over the at least one magnetic head; and
a controller electrically coupled to the at least one magnetic head for controlling operation of the at least one magnetic head.

11. A system, comprising:
a main pole;
a trailing shield; and
an upper bump on the main pole between the main pole and the trailing shield, the upper bump comprising a magnetic material,
wherein a first distance D 1 is defined in a track direction between the trailing shield and a pole tip region of the main pole;
wherein a second distance D 2 is defined in the track direction between the trailing shield and a second region of the main pole located behind the pole tip region,
wherein D 2 is greater than D 1 , wherein the upper bump tapers in the track direction toward a media facing side thereof.

12. The system as recited in claim 11 , wherein an average angle of the tapering is between about 10 and about 21 degrees.

13. The system as recited in claim 11 , wherein the upper bump tapers less therealong in a cross-track direction toward a media facing side thereof than the main pole directly thereunder tapers.

14. The system as recited in claim 11 , wherein sidewalls of the upper bump positioned opposite each other in a cross-track direction form a relatively smaller angle than an angle formed by sidewalls of the main pole positioned opposite each other in the cross-track direction.

15. The system as recited in claim 11 , wherein the upper bump tapers less therealong toward a media facing side thereof than the main pole directly thereunder tapers.

Assignees

• HGST Netherlands BV
• Western Digital Tech Inc

Inventors

• Ho Kuok San
• Song Suping
• Van Der Heijden Petrus Antonius

Classifications

• G11B5/1278 Primary

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

• G11B5/6082 Primary

  Design of the air bearing surface · CPC title

• G11B5/60 Primary

  Fluid-dynamic spacing of heads from record-carriers · CPC title

• G11B5/23

  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 title

• G11B5/315

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