Magnetic recording write apparatus having a stepped conformal trailing shield

Patent metadata

Field	Value
Publication number	US-9754611-B1
Application number	US-201514953982-A
Country	US
Kind code	B1
Filing date	Nov 30, 2015
Priority date	Nov 30, 2015
Publication date	Sep 5, 2017
Grant date	Sep 5, 2017

Abstract

A magnetic write apparatus has a media-facing surface (MFS), a pole having leading and trailing surfaces, a trailing shield having a pole-facing surface, a write gap and coil(s). The pole's trailing surface has a portion adjoining the MFS and oriented at a nonzero, acute bevel angle from a direction perpendicular to the MFS. The pole-facing surface includes a first portion adjoining the MFS and oriented at a first angle substantially the same as the bevel angle, a second portion oriented at a second angle greater than the first trailing shield angle, and a third portion oriented at a third angle substantially the same as the first angle. The write gap has first, second and third thicknesses adjacent to the first, second and third portions of the pole-facing surface, respectively. The first thickness is constant. The second thickness varies. The third thickness is constant and greater than the first thickness.

First claim

What is claimed is:

1. A magnetic write apparatus having a media-facing surface (MFS) comprising:
a pole including a leading surface and a trailing surface opposite to the leading surface, the trailing surface having a first portion and a second portion adjoining the first portion of the trailing surface, the first portion of the trailing surface adjoining the MFS being oriented at a bevel angle from a direction perpendicular to the MFS, the bevel angle being greater than zero and less than ninety degrees, the first portion of the trailing surface being between the second portion of the trailing surface and the MFS, the second portion of the trailing surface commencing a trailing surface distance from the MFS, the second portion of the trailing surface being oriented substantially at the direction perpendicular to the MFS;
a trailing shield having a pole-facing surface, the pole-facing surface including a first portion, a second portion, a third portion and a fourth portion, the first portion of the pole-facing surface adjoining the MFS and being oriented at a first trailing shield angle from the direction perpendicular to the MFS, the first trailing shield angle being substantially the same as the bevel angle, the second portion of the pole-facing surface being oriented at a second trailing shield angle from the direction perpendicular to the MFS, the second trailing shield angle being greater than the first trailing shield angle, the third portion of the pole-facing surface being oriented at a third trailing shield angle from the direction perpendicular to the MFS, the third trailing shield angle being substantially the same as the first trailing shield angle, the fourth portion being oriented at a fourth trailing shield angle from the direction perpendicular to the MFS, the fourth trailing shield angle being greater than the third trailing shield angle and not more than ninety degrees, the second portion of the pole-facing surface being between the first portion of the pole-facing surface and the third portion of the pole-facing surface, the third portion being between the second portion of the pole-facing surface and the fourth portion of the pole-facing surface, the fourth portion adjoining the third portion of the pole-facing surface at a fourth portion distance from the MFS that is greater than the trailing surface distance;
a write gap between the trailing shield and the pole, the write gap having a first thickness adjacent to the first portion of the pole-facing surface, a second thickness adjacent to the second portion of the pole-facing surface and a third thickness adjacent to the third portion of the pole-facing surface, the first thickness being substantially constant, the second thickness being a variable thickness, the third thickness being substantially constant and greater than the first thickness; and
at least one coil for energizing the pole.

2. The magnetic write apparatus of claim 1 wherein the second trailing shield angle is at least forty-five degrees and not more than eighty-five degrees.

3. The magnetic write apparatus of claim 2 wherein the second trailing shield angle is at least sixty degrees and not more than seventy-five degrees.

4. The magnetic write apparatus of claim 1 wherein the bevel angle is at least twenty-two degrees and not more than twenty-eight degrees.

5. The magnetic write apparatus of claim 1 wherein the first portion of the pole-facing surface extends at least twenty nanometers and not more than one hundred nanometers from the MFS.

6. The magnetic write apparatus of claim 5 wherein the first portion of the pole-facing surface extends at least forty and not more than sixty nanometers from the MFS.

7. The magnetic write apparatus of claim 1 wherein the first thickness of the write gap is not more than twenty-five nanometers.

8. The magnetic write apparatus of claim 7 wherein the third thickness is at least fifteen nanometers greater than the first thickness and not more than fifty nanometers greater than the first thickness.

9. The magnetic write apparatus of claim 8 wherein the third thickness is at least twenty nanometers greater than the first thickness and not more than thirty nanometers greater than the first thickness.

10. The magnetic write apparatus of claim 1 wherein the fourth trailing shield angle is at least forty-five degrees and not more than ninety degrees.

11. The magnetic write apparatus of claim 10 wherein the trailing shield terminates at a location recessed from the MFS, the location being at least one hundred nanometers and not more than four hundred nanometers in the direction perpendicular to the MFS from an edge of the fourth portion of the pole-facing surface furthest from the MFS.

12. The magnetic write apparatus of claim 10 wherein the fourth portion of the pole facing surface extends a distance parallel to the MFS of at least fifteen nanometers and not more than one hundred nanometers.

13. The magnetic write apparatus of claim 12 wherein the distance parallel to the MFS is at least forty nanometers and not more than sixty nanometers.

14. The magnetic write apparatus of claim 11 wherein the second portion of the pole-facing surface adjoins the first portion of the pole-facing surface, the third portion of the pole-facing surface adjoins the second portion of the pole-facing surface, and the pole-facing surface further includes a fifth portion adjoining the fourth portion, the fourth portion being between the third portion and the fifth portion, the fifth portion of the pole-facing surface being oriented at a fifth trailing shield angle from the direction perpendicular to the MFS, the fifth trailing shield angle being less than the fourth trailing shield angle and not less than zero.

15. A data storage device comprising:
a media,
a substrate having a media-facing surface (MFS), and
a magnetic apparatus coupled with the substrate, the magnetic apparatus including a pole, a trailing shield, a write gap and at least one coil for energizing the pole, the pole including a leading surface and a trailing surface opposite to the leading surface, the trailing surface having a first portion and a second portion adjoining the first portion of the trailing surface, the first portion of the trailing surface adjoining the MFS being oriented at a bevel angle from a direction perpendicular to the MFS, the bevel angle being greater than zero and less than ninety degrees, the second portion of the trailing surface commencing a trailing surface distance from the MFS, the first portion of the trailing surface being between the second portion of the trailing surface and the MFS, the trailing shield having a pole-facing surface, the pole-facing surface including a first portion, a second portion, a third portion and a fourth portion, the first portion of the pole-facing surface adjoining the MFS and being oriented at a first trailing shield angle from the direction perpendicular to the MFS, the first trailing shield angle being substantially the same as the bevel angle, the second portion of the pole-facing surface being oriented at a second trailing shield angle greater than the first trailing shield angle, the third portion of the pole-facing surface being oriented at a third trailing shield angle substantially the same as the first trailing shield angle, the fourth portion being oriented at a fourth trailing shield angle from the direction perpendicular to the MFS, the second portion of the pole-facing surface being between the first portion of the pole-facing surface and the third portion of the pole-facing surface, the third portion being between the second portion of

Assignees

• Western Digital (Fremont) Llc

Inventors

• Liu Feng
• Li Zhanjie
• Bai Zhigang
• Wang Yi

Classifications

• 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

• G11B5/3146

  magnetic layers · CPC title

• 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

• G11B5/11

  Shielding of head against electric or magnetic fields · CPC title

• G11B5/315

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