Scissor reader with side shield decoupled from bias material

Patent metadata

Field	Value
Publication number	US-9230576-B1
Application number	US-201414479767-A
Country	US
Kind code	B1
Filing date	Sep 8, 2014
Priority date	Sep 8, 2014
Publication date	Jan 5, 2016
Grant date	Jan 5, 2016

Abstract

Embodiments disclosed herein generally relate to a magnetic head having a sensor stack and a bias material that is aligned in a direction perpendicular to a media facing surface. The sensor stack and a first portion of the bias material are laterally bookended by synthetic antiferromagnetic (SAF) structures, and a second portion of the bias material is laterally bookended by a dielectric material. In this configuration, the SAF structures are decoupled from the bias material, which minimizes the disturbance to the bias material.

First claim

What is claimed is:

1. A magnetic head, comprising:
a sensor stack;
side shields laterally bookending the sensor stack, wherein the side shields extend to a media facing surface, wherein the side shields each comprises an antiferromagnetic layer, a first magnetic layer, a second magnetic layer, and a nonmagnetic layer disposed between the first and second magnetic layers;
a first multilayer shield disposed under the sensor stack and the side shields;
a sensor shield disposed under the first multilayer shield;
a second multilayer shield disposed over the sensor stack and the side shields;
a first insulating layer disposed between the first multilayer shield and the side shields; and
a second insulating layer disposed between the second multilayer shield and the side shields.

2. The magnetic head of claim 1 , wherein the antiferromagnetic layer is disposed adjacent the first magnetic layer.

3. The magnetic head of claim 1 , wherein the antiferromagnetic layer is disposed adjacent the second magnetic layer.

4. A magnetic head, comprising:
a sensor stack;
a dielectric material laterally bookending the sensor stack, wherein the dielectric material extends to a media facing surface;
a first multilayer shield disposed under the sensor stack and the dielectric material;
a sensor shield disposed under the first multilayer shield;
a second multilayer shield disposed over the sensor stack and the dielectric material; and
two insulating layers each disposed between the dielectric material and the sensor stack, wherein the two insulating layers are distinct from the dielectric material.

5. The magnetic head of claim 4 , wherein the first and second multilayer shields each comprises an antiferromagnetic layer and a first magnetic layer.

6. The magnetic head of claim 5 , wherein the first or second multilayer shields each further comprises a second magnetic layer and a nonmagnetic layer.

7. A magnetic head, comprising:
a sensor stack;
a dielectric material laterally bookending the sensor stack, wherein the dielectric material extends to a media facing surface;
a first multilayer shield disposed under the sensor stack and the dielectric material;
a sensor shield disposed under the first multilayer shield;
a second multilayer shield disposed over the sensor stack and the dielectric material; and
a first nonmagnetic layer and a first magnetic layer disposed over the sensor stack, wherein the first nonmagnetic layer and the first magnetic layer are laterally bookended by the dielectric material.

8. The magnetic head of claim 7 , further comprising a second nonmagnetic layer and a second magnetic layer disposed under the sensor stack, wherein the second nonmagnetic layer and the second magnetic layer are laterally bookended by the dielectric material.

Assignees

• HGST Netherlands BV

Inventors

• Gill Hardayal Singh
• Huang Shiwen
• Le Quang
• Liu Guangli
• Liu Xiaoyong
• Song Suping

Classifications

• G11B5/3932

  Magnetic biasing films · CPC title

• G11B2005/3996

  large or giant magnetoresistive effects [GMR], e.g. as generated in spin-valve [SV] devices · 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

• G11B5/3146

  magnetic layers · CPC title

• G11B5/11

  Shielding of head against electric or magnetic fields · CPC title