Magnetic head with assisted magnetic recording and method of making thereof

Patent metadata

Field	Value
Publication number	US-11017802-B2
Application number	US-202016998989-A
Country	US
Kind code	B2
Filing date	Aug 20, 2020
Priority date	Oct 9, 2018
Publication date	May 25, 2021
Grant date	May 25, 2021

Abstract

A magnetic head includes a main pole configured to serve as a first electrode, an upper pole containing a trailing magnetic shield configured to a serve as a second electrode, and a record element located in a trailing gap between the main pole and the trailing magnetic shield. The record element includes an electrically conductive, non-magnetic material portion which is not part of a spin torque oscillator stack. The main pole and the trailing magnetic shield are electrically shorted by the record element across the trailing gap between the main pole and the trailing magnetic shield such that an electrically conductive path is present between the main pole and the trailing magnetic shield through the record element.

First claim

What is claimed is:

1. A magnetic head, comprising:
a main pole configured to serve as a first electrode, wherein the main pole has a surface at an air bearing surface (ABS);
a trailing shield configured to serve as a second electrode, wherein the trailing shield has a surface at the ABS and wherein a trailing gap is disposed between the main pole and the trailing shield; and
a record element disposed in the trailing gap, the record element comprising:
a spin torque oscillator (STO) stack, wherein the STO stack has a surface at the ABS; and
a conductive layer stack spaced from the ABS, wherein the STO stack and the conductive layer stack comprises a same set of component layers.

2. The magnetic head of claim 1 , further comprising a dielectric spacer disposed between the STO stack and the conductive layer stack.

3. The magnetic head of claim 1 , wherein the STO stack comprises a conductive seed layer, a spin polarized layer, and a nonmagnetic spacer layer.

4. The magnetic head of claim 3 , wherein the STO stack additionally comprises a field generating layer.

5. A hard disk drive comprising the magnetic head of claim 1 .

6. A magnetic head, comprising:
a main pole configured to serve as a first electrode, wherein the main pole has a surface at an air bearing surface (ABS);
a trailing shield configured to serve as a second electrode, wherein the trailing shield has a surface at the ABS and wherein a trailing gap is disposed between the main pole and the trailing shield; and
a record element disposed in the trailing gap, the record element comprising:
a spin torque oscillator (STO) stack, wherein the STO stack has a surface at the ABS;
a conductive layer stack spaced from the ABS; and
a conductive material portion spaced from the ABS and disposed between the main pole and the trailing shield.

7. The magnetic head of claim 6 , wherein the conductive material portion is in contact with the conductive layer stack.

8. The magnetic head of claim 6 , wherein the conductive material portion spaced from the ABS by a portion of the trailing shield.

9. The magnetic head of claim 6 , wherein the conductive material portion comprises a non-magnetic metal.

10. The magnetic head of claim 9 , wherein the non-magnetic material comprises copper, tungsten, ruthenium, chromium, or a non-magnetic metallic alloy.

11. A magnetic head, comprising:
a main pole configured to serve as a first electrode, wherein the main pole has a surface at an air bearing surface (ABS);
a trailing shield configured to serve as a second electrode, wherein the trailing shield has a surface at the ABS and wherein a trailing gap is disposed between the main pole and the trailing shield; and
a record element disposed in the trailing gap, the record element comprising:
a spin torque oscillator (STO) stack, wherein the STO stack has a surface at the ABS; and
a first conductive material portion spaced from the ABS and in contact with the STO stack, the first conductive material portion contacting a trailing sidewall of the main pole.

12. The magnetic head of claim 11 , wherein the record element further comprises a second conductive material portion spaced from the ABS.

13. The magnetic head of claim 11 , wherein the first conductive material portion contacts a rear sidewall of the STO stack.

14. A hard disk drive comprising the magnetic head of claim 11 .

15. A magnetic head, comprising:
a main pole configured to serve as a first electrode, wherein the main pole has a surface at an air bearing surface (ABS);
a trailing shield configured to serve as a second electrode, wherein the trailing shield has a surface at the ABS and wherein a trailing gap is disposed between the main pole and the trailing shield; and
a conductive material portion disposed in the trailing gap in contact with the main pole and the trailing shield, wherein the conductive material portion has a surface at the ABS and is distinct from a spin torque oscillator (STO).

16. The magnetic head of claim 15 , wherein the conductive material portion comprises copper, gold, platinum, ruthenium, chromium, tungsten, or a non-magnetic metallic alloy layer.

17. The magnetic head of claim 15 , wherein the conductive material portion does not include a material that generates an alternating magnetic field upon application of an electrical current.

18. A hard disk drive comprising the magnetic head of claim 15 .

19. A magnetic head, comprising:
a main pole configured to serve as a first electrode, wherein the main pole has a surface at an air bearing surface (ABS);
a trailing shield configured to serve as a second electrode, wherein the trailing shield has a surface at the ABS and wherein a trailing gap is disposed between the main pole and the trailing shield; and
a conductive material portion disposed in the trailing, wherein the conductive material portion has a surface at the ABS and is distinct from a spin torque oscillator (STO), wherein the conductive material portion comprises a multilayer stack of non-magnetic layers.

20. A magnetic head, comprising:
a main pole configured to serve as a first electrode, wherein the main pole has a surface at an air bearing surface (ABS);
a trailing shield configured to serve as a second electrode, wherein the trailing shield has a surface at the ABS and wherein a trailing gap is disposed between the main pole and the trailing shield; and
a conductive material portion disposed in the trailing, wherein the conductive material portion has a surface at the ABS and is distinct from a spin torque oscillator (STO), wherein the conductive material portion comprises a multilayer layer stack of electrically conductive magnetic and non-magnetic layer.

Assignees

• Western Digital Tech Inc

Inventors

• Chembrolu Venkatesh
• Bai Zhigang
• Wei Yaguang
• Zheng Anna
• Narayana Supradeep
• Song Suping
• Lam Terence
• Ho Michael Kouk San
• Shi Changqing
• Guan Lijie
• Zhu Jian-Gang

Classifications

• G11B5/1875

  "Composite" pole pieces, i.e. poles composed in some parts of magnetic particles and in some other parts of magnetic metal layers · CPC title

• G11B5/115 Primary

  Shielding devices arranged between heads or windings ({G11B5/265} , G11B5/29 take precedence) · CPC title

• G11B2005/0024

  Microwave assisted recording · CPC title

• G11B2005/0008

  Magnetic conditionning of heads, e.g. biasing · CPC title

• G11B5/314

  where the layers are extra layers normally not provided in the transducing structure, e.g. optical layers (G11B5/3196 takes precedence) · CPC title