Magnetic recording head soft error rate improvement with compact main pole

Patent metadata

Field	Value
Publication number	US-11087783-B1
Application number	US-202016917521-A
Country	US
Kind code	B1
Filing date	Jun 30, 2020
Priority date	Jun 30, 2020
Publication date	Aug 10, 2021
Grant date	Aug 10, 2021

Abstract

The present disclosure is generally related to a magnetic media drive employing a magnetic recording head. The magnetic recording head comprises a main pole extending to a media facing surface (MFS). The main pole has a gradually increasing cross-section area with a low aspect ratio from the MFS to a surface recessed from and parallel to the MFS. The main pole comprises a first leading edge taper angle (LETA), a second LETA less than the first LETA, a first trailing edge taper angle (TETA), and a second TETA less than the first TETA. The main pole further comprises a first flare recessed a first distance from the MFS, the first flare having a first angle, and a second flare recessed a second distance from the MFS greater than the first distance, the second flare having a second angle greater than the first angle.

First claim

What is claimed is:

1. A magnetic recording head, comprising:
a return pole;
a main pole disposed adjacent to the return pole, the main pole extending to a media facing surface; and
a coil disposed around a portion of the main pole, the coil being recessed from the media facing surface,
wherein the main pole has a first leading edge taper angle, the first leading edge taper angle being an angle a first surface of the main pole is disposed at with respect to a first plane perpendicular to the media facing surface, the first surface being disposed adjacent to the media facing surface,
wherein the main pole has a first trailing edge taper angle, the first trailing edge taper angle being an angle a second surface of the main pole is disposed at with respect to a second plane perpendicular to the media facing surface, the second surface being disposed adjacent to the media facing surface opposite to the first surface,
wherein the first trailing edge taper angle is less than the first leading edge taper angle,
wherein the first surface of the main pole has a greater length than the second surface of the main pole, and
wherein the main pole has a gradually increasing cross-sectional area from the media facing surface to a third plane recessed from and parallel to the media facing surface towards the coil such that a ratio of a thickness of the main pole to a width of the main pole is about 1:4.

2. The magnetic recording head of claim 1 , wherein the first leading edge taper angle is between about 30 degrees to about 40 degrees, the first trailing edge taper angle is between about 25 degrees to about 30 degrees, and wherein the main pole has a second leading edge taper angle between about 10 degrees to about 30 degrees and a second trailing edge taper angle between about 10 degrees to about 30 degrees.

3. The magnetic recording head of claim 2 , wherein the second leading edge taper angle is an angle a third surface of the main pole is disposed at with respect to a fourth plane perpendicular to the media facing surface, the third surface being disposed adjacent to the first surface;
wherein the second leading edge taper angle is recessed from the media facing surface a first distance;
wherein the second trailing edge taper angle is an angle a fourth surface of the main pole is disposed at with respect to a fifth plane perpendicular to the media facing surface, the fourth surface being disposed adjacent to the second surface; and
wherein the second trailing edge taper angle is recessed a second distance from the media facing surface less than the first distance of the second leading edge taper angle.

4. The magnetic recording head of claim 3 , wherein the first distance is between about 0.10 μm to about 0.50 μm, and wherein the second distance is between about 0.09 μm to about 0.49 μm.

5. The magnetic recording head of claim 1 , wherein the main pole further comprises a first flare having a first flare angle, and a second flare having a second flare angle greater than the first angle.

6. The magnetic recording head of claim 5 , wherein the first flare angle is between about 20 degrees to about 35 degrees, and wherein the second flare angle is between about 30 degrees to about 45 degrees.

7. A data storage device comprising the magnetic recording head of claim 1 .

8. The magnetic recording head of claim 1 , wherein the first surface of the main pole is coupled to a third surface of the main pole, the first and third surfaces forming a second leading edge taper angle, and wherein the second surface of the main pole is coupled to a fourth surface of the main pole, the second and fourth surfaces forming a second trailing edge taper angle.

9. A magnetic recording head, comprising:
a return pole;
a trailing shield coupled to the return pole; and
a main pole disposed adjacent to the trailing shield, the main pole extending to a media facing surface, wherein the main pole comprises:
a first leading edge taper angle disposed at the media facing surface;
a second leading edge taper angle disposed adjacent to the first leading edge taper angle, the second leading edge taper angle being between about 10 degrees to about 30 degrees, wherein the second leading edge taper angle is less than the first leading edge taper angle;
a first surface extending from the first leading edge taper angle to the second leading edge taper angle;
a first trailing edge taper angle disposed at the media facing surface adjacent to the trailing shield, the first trailing edge taper angle being less than the first leading edge taper angle;
a second trailing edge taper angle disposed adjacent to the first trailing edge taper angle, the second trailing edge taper angle being between about 10 degrees to about 30 degrees, wherein the second trailing edge taper angle is less than the first trailing edge taper angle; and
a second surface extending from the first trailing edge taper angle to the second trailing edge taper angle.

10. The magnetic recording head of claim 9 , wherein the main pole has a gradually increasing cross-section area with a low aspect ratio from the media facing surface to a plane recessed from and parallel to the media facing surface such that a ratio of a thickness of the main pole to a width of the main pole is about 1:4.

11. The magnetic recording head of claim 9 , wherein the main pole further comprises a first flare recessed a fifth distance from the media facing surface and a second flare recessed a sixth distance from the media facing surface, the sixth distance being greater than the fifth distance.

12. The magnetic recording head of claim 11 , wherein the first flare has an angle of about 20 degrees to about 35 degrees, and wherein the second flare has an angle of about 30 degrees for about 45 degrees.

13. A data storage device comprising the magnetic recording head of claim 9 .

14. A magnetic recording head, comprising:
a return pole;
a trailing shield coupled to the return pole; and
a main pole disposed adjacent to the trailing shield, the main pole extending to a media facing surface, wherein the main pole comprises:
a first leading edge taper angle disposed at the media facing surface;
a second leading edge taper angle disposed adjacent to the first leading edge taper angle, the second leading edge taper angle being between about 10 degrees to about 30 degrees, wherein the second leading edge taper angle is less than the first leading edge taper angle;
a first trailing edge taper angle disposed at the media facing surface adjacent to the trailing shield, the first trailing edge taper angle being less than the first leading edge taper angle; and
a second trailing edge taper angle disposed adjacent to the first trailing edge taper angle, the second trailing edge taper angle being between about 10 degrees to about 30 degrees, wherein the second trailing edge taper angle is less than the first trailing edge taper angle,

wherein the first leading edge taper angle is between about 30 degrees to about 40 degrees and the first trailing edge taper angle is between about 25 degrees to about 30 degrees;
wherein the second leading edge taper angle is recessed a first distance from the media facing surface; and
wherein the second trailing edge taper angle is recessed a second distance from the media facing surface, the second distance being less than the first distance.

15. The magnetic recording head of claim 14 , wherein the first distance is about 0.14 μm and the second distance is about 0.11 μm.

16. The magnetic recording head of claim 14 , wherein the main pole further comprises:
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Assignees

• Western Digital Tech Inc

Inventors

• Song Suping
• Lam Terence
• Shi Changqing
• Guan Lijie

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

• G11B5/1278

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

• G11B2005/0018

  by current biasing control or regulation · CPC title