Magnetic recording head front shield formation

Patent metadata

Field	Value
Publication number	US-9495979-B1
Application number	US-201514871597-A
Country	US
Kind code	B1
Filing date	Sep 30, 2015
Priority date	Sep 30, 2015
Publication date	Nov 15, 2016
Grant date	Nov 15, 2016

Abstract

Implementations disclosed herein provide a method of forming a first layer of a front shield in a magnetic recording head, depositing an active shield control (ASC) device on the first layer, and forming a second layer of the front shield on top of the ASC device and the first layer of the front shield. In another implementation, an apparatus includes a write pole, and a two layer front shield formed on the write pole, including an ASC device between the two layers of the front shield.

First claim

What is claimed is:

1. A method comprising:
forming a first layer of a front shield in a magnetic recording head;
depositing a first dielectric material onto the first layer of the front shield;
forming an active shield control (ASC) device on the first dielectric material configured to synchronize the response to a magnetomotive force (MMF) of a write pole and the front shield; depositing a second dielectric material on the ASC device; and
forming a second layer of the front shield directly on top of the second dielectric material, and the first layer of the front shield.

2. The method of claim 1 , further comprising forming an amorphous carbon mold on the first layer of the front shield.

3. The method of claim 2 , further comprising removing the amorphous carbon mold on the first layer of the front shield.

4. The method of claim 1 , further comprising one or both of milling or dryetching the ASC device.

5. The method of claim 4 , wherein the one or both of milling or dryetching the ASC device is performed at predetermined angles selected based on selectivity for a specific material of the ASC device.

6. The method of claim 5 , further comprising depositing a third dielectric material on a write pole adjacent to the first layer of the front shield and a fourth dielectric material on the third dielectric material adjacent to the second layer of the front shield.

7. The method of claim 1 , wherein depositing the first dielectric material is performed by at least one of atomic layer deposition, chemical vapor deposition, metal organic chemical vapor deposition, sputtering, and electrical beam deposition/vaporization.

8. A method comprising:
forming a first layer of a front shield in a magnetic recording head;
depositing a first alumina onto the first layer of the front shield;
depositing an active shield control (ASC) device on the alumina, the ASC device including a copper wire and configured to synchronize the response to a magnetomotive force (MMF) of a write pole and the front shield;
depositing a second alumina onto the copper wire; and
forming a second layer of the front shield directly on top of the second alumina and the first layer of the front shield.

9. The method of claim 8 , further comprising one or both of milling or dryetching the copper wire.

10. The method of claim 8 , forming an amorphous carbon mold on the first layer of the front shield.

11. The method of claim 10 , further comprising removing the amorphous carbon mold on the first layer of the front shield.

Assignees

• Seagate Technology Llc

Inventors

• Zhang Xiaohong
• Tian Wei
• Shen Zhe
• Lin Dong
• Mundenar Joseph

Classifications

• G11B5/11 Primary

  Shielding of head against electric or magnetic fields · CPC title

• G11B5/1272 Primary

  Assembling or shaping of elements (G11B5/1278 takes precedence) · CPC title

• G11B5/3912 Primary

  Arrangements in which the active read-out elements are transducing in association with active magnetic shields, e.g. magnetically coupled shields (G11B5/3916 takes precedence) · CPC title

• G11B5/3116

  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) · CPC title

• G11B5/1278

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