Magnetic recording sensor with AFM exchange coupled shield stabilization

• US 8,797,692 B1
• Filed: 09/07/2012
• Issued: 08/05/2014
• Est. Priority Date: 09/07/2012
• Status: Active Grant

• Current Assignee: Western Digital Technologies Incorporated (Western Digital Corporation)
• Original Assignee: Western Digital (Fremont) LLC (Western Digital Corporation)
• Inventors: Guo, Yimin, Xiao, Rongfu, Zheng, Yuankai
• Primary Examiner(s): EVANS, JEFFERSON A
• Application Number:
  US13/607,593
• Time in Patent Office: 697 Days
• Field of Search: 360/319, 360/324.1, 360/324.11, 360/324.12, 360/324.2
• US Class Current: 360/319
• CPC Class Codes: B82Y 10/00 Nanotechnology for information processing, storage or transmission, e.g. quantum computing or single electron logic
• CPC Class Codes: G11B 2005/3996 large or giant magnetoresistive effects [GMR], e.g. as generated in spin-valve [SV] devices
• CPC Class Codes: G11B 5/3909 Arrangements using a magnetic tunnel junction
• CPC Class Codes: G11B 5/3912 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

Abstract

A magnetic recording sensor with AFM exchange coupled shield stabilization for use in a data storage device includes a read sensor positioned between a bottom shield and a top shield. The top shield comprises a first ferromagnetic (FM) layer, a coupling layer, and a second FM layer. An exchange coupling insertion layer is provided between the second FM layer and an antiferromagnetic (AFM) layer above. In an embodiment of the invention, the exchange coupling insertion layer comprises CoFe with a Fe content from about 35-45 at. %, and thickness from about 1 nm to about 3 nm. In another embodiment of the invention, the exchange coupling insertion layer comprises a bi-layer, including first sub-layer comprising CoFe with Fe content from about 8-12 at. %, and second sub-layer comprising CoFe with Fe content from about 35-45 at. %, and the bi-layer has a thickness less than about 4 nm.

Claims

1. A magnetic recording sensor for use in a data storage device, the magnetic recording sensor comprising:

a read sensor positioned between a magnetic bottom shield and a magnetic top shield;

wherein the magnetic top shield comprises;

a first ferromagnetic (FM) layer above a nonmagnetic layer, the first FM layer comprising a first soft magnetic material;

an antiferromagnetic coupling (AFC) layer above the first FM layer;

a second FM layer above the AFC layer, the second FM layer comprising a second soft magnetic material;

an exchange coupling insertion layer above the second FM layer, and

an antiferromagnetic (AFM) layer above the exchange coupling insertion layer;

wherein the AFC layer comprises a first AFC enhancing layer above the first FM layer, a nonmagnetic spacer layer above the first AFC enhancing layer, and

a second AFC enhancing layer above the nonmagnetic spacer layer.

2. The magnetic recording sensor of claim 1 wherein the soft magnetic material comprises NiFe.

3. The magnetic recording sensor of claim 1 wherein the AFM layer comprises IrMn, PtMn, RuMn, NiMn, FeMn, or PdMn.

4. The magnetic recording sensor of claim 1 wherein the first AFC enhancing layer and the second AFC enhancing layer comprise CoFe, wherein the Fe content comprises from about 10 at. % to about 70 at. %.

5. The magnetic recording sensor of claim 1 wherein the first AFC enhancing layer has a thickness less than 2 nm and the second AFC enhancing layer has a thickness less than 2 nm.

6. The magnetic recording sensor of claim 1 wherein the first FM layer and second FM layer each have a thickness from about 10 nm to about 35 nm, and

the AFM layer has a thickness from about 5 nm to about 20 nm.

7. The magnetic recording sensor of claim 1 wherein the first soft magnetic material and the second soft magnetic material comprise the same soft magnetic material.

8. A magnetic recording sensor for use in a data storage device, the magnetic recording sensor comprising:

a read sensor positioned between a magnetic bottom shield and a magnetic top shield;

wherein the magnetic to shield comprises;

a first ferromagnetic (FM) layer above a nonmagnetic layer, the first FM layer comprising a first soft magnetic material;

an antiferromagnetic coupling (AFC) layer above the first FM layer;

a second FM layer above the AFC layer, the second FM layer comprising a second soft magnetic material;

an exchange coupling insertion layer above the second FM layer, and

an antiferromagnetic (AFM) layer above the exchange coupling insertion layer; and

wherein the exchange coupling insertion layer comprises CoFe with a Fe content from about 35 at. % to about 45 at. %, and has a thickness from about 1 nm to about 3 nm.

9. A magnetic recording sensor for use in a data storage device, the magnetic recording sensor comprising:

a read sensor positioned between a magnetic bottom shield and a magnetic top shield;

wherein the magnetic to shield comprises;

a first ferromagnetic (FM) layer above a nonmagnetic layer, the first FM layer comprising a first soft magnetic material;

an antiferromagnetic coupling (AFC) layer above the first FM layer;

a second FM layer above the AFC layer, the second FM layer comprising a second soft magnetic material;

an exchange coupling insertion layer above the second FM layer, and

an antiferromagnetic (AFM) layer above the exchange coupling insertion layer; and

wherein the exchange coupling insertion layer comprises a bi-layer, the bi-layer comprising a first sub-layer above the second FM layer and a second sub-layer above the first sub-layer, wherein;

the first sub-layer comprises CoFe with a Fe content from about 8 at. % to about 12 at. %;

the second sub-layer comprise CoFe with a Fe content from about 35 at. % to about 45 at. %, and

the bilayer has a thickness less than about 4 nm.

10. A disk drive comprising:

a slider including a magnetic recording sensor, the magnetic recording sensor configured to reside in proximity to a recording medium during use, the magnetic sensor comprising;

a read sensor positioned between a magnetic bottom shield and a magnetic top shield;

wherein the magnetic top shield comprises;

a first ferromagnetic (FM) layer above a nonmagnetic layer, the first FM layer comprising a first soft magnetic material;

an antiferromagnetic coupling (AFC) layer above the first FM layer;

a second FM layer above the AFC layer, the second FM layer comprising a second soft magnetic material;

an exchange coupling insertion layer above the second FM layer, and

an antiferromagnetic (AFM) layer above the exchange coupling insertion layer, wherein;

the exchange coupling insertion layer comprises CoFe with a Fe content from about 35 at. % to about 45 at. %, and a thickness from about 1 nm to about 3 nm.

11. The magnetic recording sensor of claim 10 wherein the first soft magnetic material and the second soft magnetic material comprise the same soft magnetic material.

12. A disk drive comprising:

a slider including a magnetic recording sensor, the magnetic recording sensor configured to reside in proximity to a recording medium during use, the magnetic sensor comprising;

a read sensor positioned between a magnetic bottom shield and a magnetic top shield;

wherein the magnetic top shield comprises;

a first ferromagnetic (FM) layer above a nonmagnetic layer, the first FM layer comprising a first soft magnetic material;

an antiferromagnetic coupling (AFC) layer above the first FM layer;

a second FM layer above the AFC layer, the second FM layer comprising a second soft magnetic material;

an exchange coupling insertion layer above the second FM layer, and

an antiferromagnetic (AFM) layer above the exchange coupling insertion layer, wherein;

the exchange coupling insertion layer comprises a bi-layer, the bi-layer comprising a first sub-layer above the second FM layer and a second sub-layer above the first sub-layer, wherein;

the first sub-layer comprises CoFe with a Fe content from about 8 at. % to about 12 at. %;

the second sub-layer comprise CoFe with a Fe content from about 35 at. % to about 45 at. %, and

the bilayer has a thickness less than about 4 nm.

13. The disk drive of claim 12 wherein the first soft magnetic material and the second soft magnetic material comprise the same soft magnetic material.