# US 10,121,495 B2 · Magnetic recording write apparatus having a stepped conformal trailing shield

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- Number: US 10,121,495 B2
- Document ID: US10121495B2
- Status: Granted
- Kind: B2
- Application number: 15/677,145
- Filed: 2017-08-15
- Published: 2018-01-25
- Granted: 2018-11-06
- Earliest claimed: 2015-11-30
- Assignees: Western Digital (Fremont), LLC
- Applicants: Western Digital (Fremont), LLC
- Inventors: Feng Liu; Zhanjie Li; Zhigang Bai; Yi Wang
- Web page: https://patentgrep.com/patent/US10121495B2

## CPC

- G11B 5/3116: {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)}
- G11B 5/11: Shielding of head against electric or magnetic fields
- G11B 5/1278: {specially adapted for magnetisations perpendicular to the surface of the record carrier}
- G11B 5/23: Gap features {(G11B5/1871, G11B5/1875, G11B5/265, G11B5/29, G11B5/488 and subgroups, G11B5/4907 and subgroups, G11B5/4969 and subgroups take precedence)}
- G11B 5/3146: {magnetic layers}
- G11B 5/315: {Shield layers on both sides of the main pole, e.g. in perpendicular magnetic heads}
- G11B: INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER (recording measured values in a way that does not require playback through a transducer G01D9/00; recording or playback apparatus using mechanically marked tape, e.g. punched paper tape, or using unit records, e.g. punched or magnetically marked cards G06K; transferring data from one type of record carrier to another G06K1/18; circuits for coupling output of reproducer to radio receiver H04B1/20; gramophone pick-ups or like acoustic electromechanical transducers or circuits therefor H04R)

## 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.

## Claims

### Claim 1

A magnetic write apparatus comprising:
a pole comprising a pole tip that occupies a portion of a media facing surface and a pole trailing surface of the pole tip extends from the media facing surface in a yoke direction at a pole bevel angle, wherein the yoke direction extends perpendicular to the media facing surface; and
a trailing shield adjacent to the pole trailing surface of the pole tip, wherein the trailing shield comprises a pole-facing surface comprising a first portion, a second portion, a third portion, a fourth portion, a fifth portion, and a sixth portion,
wherein the first portion extends from the media facing surface in the yoke direction at a first trailing shield angle that is substantially equal to the pole bevel angle;
wherein the second portion extends from the first portion in the yoke direction at a second trailing shield angle that is greater than the first trailing shield angle;
wherein the third portion extends from the second portion in the yoke direction at a third trailing shield angle that is substantially equal to the first trailing shield angle;
wherein the fourth portion extends from the third portion in the yoke direction at a fourth trailing shield angle that is greater than the third trailing shield angle;
wherein the fifth portion extends substantially parallel to the yoke direction away from the media facing surface; and
wherein the sixth portion extends between the fourth portion and the fifth portion.

### Claim 2 (depends on 1)

The magnetic write apparatus of claim 1, wherein the sixth portion extends at a sixth trailing shield angle that is smaller than the fourth trailing shield angle.

### Claim 3 (depends on 1)

The magnetic write apparatus of claim 1, wherein the pole trailing surface comprises a first trailing surface portion having the pole bevel angle and a second trailing surface portion extending substantially parallel to the yoke direction from the first trailing surface portion, wherein the first trailing surface portion extends to a first distance from the media facing surface, and wherein a combined width of the first portion, the second portion, and the third portion is less than the first distance.

### Claim 4 (depends on 1)

The magnetic write apparatus of claim 1, wherein a write gap between the pole trailing surface and the pole-facing surface increases from the media facing surface in the yoke direction.

### Claim 5

A magnetic write apparatus comprising:
a pole comprising a pole tip occupying a portion of a media facing surface and a yoke extending from the pole tip in a yoke direction that extends in a direction perpendicular to the media facing surface, wherein the pole tip comprises a pole trailing surface having a first trailing surface portion that extends to a first distance from the media facing surface in the yoke direction at a pole bevel angle; and
a trailing shield adjacent to the pole trailing surface of the pole tip, wherein the trailing shield comprises a pole-facing surface of the trailing shield facing the pole trailing surface, and wherein the pole-facing surface comprises a first portion, a second portion, and a third portion extending in the yoke direction,
wherein the third portion extends beyond the first distance in the yoke direction,
wherein the first portion of the pole-facing surface extends from the media facing surface in the yoke direction at a first trailing shield angle that is substantially equal to the pole bevel angle, wherein the second portion of the pole-facing surface extends from the first portion in the yoke direction at a second trailing shield angle that is greater than the first trailing shield angle; and wherein the third portion of the pole-facing surface extends from the second portion in the yoke direction at a third trailing shield angle that is substantially equal to the first trailing shield angle,
wherein the pole-facing surface further comprises a fourth portion that extends from the third portion in the yoke direction at a fourth trailing shield angle that is greater than the third trailing shield angle and a fifth portion that extends in the yoke direction substantially perpendicular to the media facing surface.

### Claim 6 (depends on 5)

The magnetic write apparatus of claim 5, further comprising a write gap between the pole trailing surface and the pole-facing surface, wherein the write gap comprises a first thickness between the first portion of the pole-facing surface and the pole trailing surface, a second thickness between the second portion of the pole-facing surface and the pole trailing surface, and a third thickness between the third portion of the pole-facing surface and the pole trailing surface,
wherein the first thickness is substantially constant;
wherein the third thickness is substantially constant and greater than the first thickness; and
wherein the second thickness varies between the first thickness and the third thickness.

### Claim 7 (depends on 6)

The magnetic write apparatus of claim 6, 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.

### Claim 8 (depends on 6)

The magnetic write apparatus of claim 6, wherein the first thickness is not more than about twenty-five nanometers.

### Claim 9 (depends on 5)

The magnetic write apparatus of claim 5, wherein the pole bevel angle is at least fifteen degrees and not more than forty degrees.

### Claim 10 (depends on 5)

The magnetic write apparatus of claim 5, wherein a width of the first portion in the yoke direction is at least twenty nanometers and not more than one hundred nanometers from the media facing surface.

### Claim 11 (depends on 5)

The magnetic write apparatus of claim 5, wherein the fourth trailing shield angle is at least forty-five degrees and not more than ninety degrees.

### Claim 12 (depends on 5)

The magnetic write apparatus of claim 5, wherein the fourth portion extends at least fifteen nanometers and not more than one hundred nanometers in a direction substantially parallel to the media facing surface.

### Claim 13 (depends on 5)

The magnetic write apparatus of claim 5, further comprising a sixth portion that extends between the fourth portion and the fifth portion at a sixth trailing shield angle that is smaller than the fourth trailing shield angle.

### Claim 14 (depends on 13)

The magnetic write apparatus of claim 13, wherein a combined width of the fourth portion, the fifth portion, and the sixth portion in the yoke direction is at least one hundred nanometers and not more than four hundred nanometers.

### Claim 15 (depends on 5)

The magnetic write apparatus of claim 5, wherein a combined width of the first portion and the second portion in the yoke direction is less than the first distance.

### Claim 16 (depends on 5)

The magnetic write apparatus of claim 5, wherein the trailing shield extends no more than six hundred nanometers from the media facing surface.