# US 2021/0280208 A1 · Areal Density Capability Improvement With A Main Pole Skin

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- Number: US 2021/0280208 A1
- Document ID: US20210280208A1
- Status: Published application
- Kind: A1
- Application number: 17/330,176
- Filed: 2021-05-25
- Published: 2021-09-09
- Earliest claimed: 2017-06-23
- Assignees: Western Digital Technologies, Inc.
- Applicants: Western Digital Technologies, Inc.
- Inventors: Suping SONG; Zhanjie LI; Michael Kuok San HO; Quang LE; Alexander M. ZELTSER
- Web page: https://patentgrep.com/patent/US20210280208A1

## CPC

- 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 5/3116: {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 5/315: {Shield layers on both sides of the main pole, e.g. in perpendicular magnetic heads}
- G11B 2005/0024: {Microwave assisted recording}
- 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

The present disclosure generally relates to data storage devices, and more specifically, to a magnetic media drive employing a magnetic recording head. The head includes a main pole at a media facing surface (MFS), a trailing shield at the MFS, and a heavy metal layer disposed between the main pole and the trailing shield at the MFS. Spin-orbit torque (SOT) is generated from the heavy metal layer and transferred to a surface of the main pole as a current passes through the heavy metal layer in a cross-track direction. The SOT executes a torque on the surface magnetization of the main pole, which reduces the magnetic flux shunting from the main pole to the trailing shield. With the reduced magnetic flux shunting from the main pole to the trailing shield, write-ability is improved.

## Claims

### Claim 1

A magnetic recording head, comprising:
a main pole;
a trailing shield; and
a heavy metal layer disposed between the main pole and the trailing shield, wherein the heavy metal layer is in contact with the main pole, wherein the heavy metal layer has a first surface at a media facing surface, and the main pole has a first surface at the media facing surface, wherein a width of the first surface of the heavy metal layer is substantially the same as the width of the first surface of the main pole.

### Claim 2 (depends on 1)

The magnetic recording head of claim 1, wherein the heavy metal layer has a second surface opposite the first surface, wherein a width of the second surface of the heavy metal layer is substantially greater than the width of the first surface of the heavy metal layer.

### Claim 3 (depends on 1)

The magnetic recording head of claim 1, wherein the main pole has a second surface adjacent the first surface, wherein the heavy metal layer is in contact with the second surface.

### Claim 4 (depends on 1)

The magnetic recording head of claim 1, wherein the heavy metal layer has an isosceles trapezoidal shape.

### Claim 5 (depends on 1)

The magnetic recording head of claim 1, wherein a write gap is formed between the main pole and the trailing shield at the media facing surface, wherein the write gap is less than 20 nm.

### Claim 6 (depends on 1)

The magnetic recording head of claim 1, wherein the heavy metal layer has a thickness ranging from about 5 nm to less than about 20 nm.

### Claim 7 (depends on 1)

The magnetic recording head of claim 1, wherein the heavy metal layer comprises a material selected from the group consisting of beta phase tantalum, beta phase tungsten, and platinum.

### Claim 8 (depends on 1)

The magnetic recording head of claim 1, wherein the heavy metal layer has a second surface opposite the first surface, a third surface connecting the first and second surfaces, and a fourth surface connecting the first and second surfaces, wherein the third surface and the fourth surface have different lengths.

### Claim 9 (depends on 1)

A magnetic media device comprising the magnetic recording head of claim 1.

### Claim 10

A magnetic recording head, comprising:
a main pole;
a trailing shield;
an intermediate layer disposed between the main pole and the trailing shield, wherein the intermediate layer is in contact with the main pole; and
a heavy metal layer in contact with the intermediate layer, wherein a shape of the intermediate layer is the same as a shape of the heavy metal layer, wherein the heavy metal layer has a rectangular shape or an isosceles trapezoidal shape.

### Claim 11 (depends on 10)

The magnetic recording head of claim 10, wherein the intermediate layer comprises a material selected from the group consisting of Fe—Co—M, Fe—Co—M—MeOx granular film, (Fe—Co—M—MeOx)n multilayer film, Ni—Mn—Mg—Zn—FeOx soft ferrites, Fe—Co—M—(Ni—Mn—Mg—Zn—FeOx) granular film, and Fe—Co—M—(Ni—Mn—Mg—Zn—FeOx)n multilayer film, wherein M is one or more of the following: B, Si, P, Al, Hf, Zr, Nb, Ti, Ta, Mo, Mg, Y, Cu, Cr, and Ni, and Me is Si, Al, Hf, Zr, Nb, Ti, Ta, Mg, Y, or Cr.

### Claim 12 (depends on 10)

The magnetic recording head of claim 10, wherein the intermediate layer comprises Co19.5Fe53Hf8O19.5.

### Claim 13 (depends on 10)

The magnetic recording head of claim 10, further comprising a trailing shield hot seed layer coupled to the trailing shield.

### Claim 14 (depends on 13)

The magnetic recording head of claim 13, wherein the heavy metal layer is in contact with the trailing shield hot seed layer.

### Claim 15 (depends on 10)

The magnetic recording head of claim 10, wherein the heavy metal layer comprises a material selected from the group consisting of beta phase tantalum, beta phase tungsten, and platinum.

### Claim 16 (depends on 10)

The magnetic recording head of claim 10, wherein a write gap is formed between the main pole and the trailing shield at a media facing surface, wherein the write gap is less than 20 nm.

### Claim 17 (depends on 10)

The magnetic recording head of claim 10, wherein the heavy metal layer has a thickness ranging from about 5 nm to less than about 20 nm.

### Claim 18 (depends on 10)

The magnetic recording head of claim 10, wherein a width of the main pole at a media facing surface (MFS) is equal to a width of the heavy metal layer at the MFS.

### Claim 19 (depends on 18)

The magnetic recording head of claim 18, wherein a width of the intermediate layer at the MFS is equal to a width of the heavy metal layer at the MFS.

### Claim 20 (depends on 10)

A magnetic media device comprising the magnetic recording head of claim 10.