Magnetic recording head with non-magnetic conductive structure

Patent metadata

Field	Value
Publication number	US-11276422-B2
Application number	US-202117229560-A
Country	US
Kind code	B2
Filing date	Apr 13, 2021
Priority date	Jun 23, 2017
Publication date	Mar 15, 2022
Grant date	Mar 15, 2022

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 trailing shield, a main pole, an STO disposed between the trailing shield and the main pole, and a non-magnetic conductive structure (or non-magnetic conductive layers) adjacent to the main pole and in contact with the STO. The non-magnetic conductive structure provides additional paths for electrical currents to flow to the STO. The non-magnetic conductive structure enables higher current density to the STO without creating hot spots at the MFS. Maximum current efficiency and uniformity can be achieved with the non-magnetic conductive structure.

First claim

The invention claimed is:

1. A magnetic recording head, comprising:
a main pole;
a spin torque oscillator in contact with the main pole, the spin torque oscillator having a first width in a cross-track direction; and
a non-magnetic conductive structure in contact with the main pole and the spin torque oscillator at a media facing surface, wherein the first width of the spin torque oscillator is greater than a collective width in the cross-track direction of the main pole and the non-magnetic conductive structure where the main pole and the non-magnetic conductive structure contact the spin torque oscillator.

2. The magnetic recording head of claim 1 , wherein the non-magnetic conductive structure comprises NiTa, Cr, Cu, Rh, NiTa/Ru, Cr/Cu, or Cr/Rh.

3. The magnetic recording head of claim 1 , wherein the main pole includes a first surface at the media facing surface, a second surface adjacent to the first surface, a third surface connected to the second surface, and a fourth surface opposite the third surface, wherein the second surface of the main pole is in contact with the spin torque oscillator.

4. The magnetic recording head of claim 3 , wherein the non-magnetic conductive structure includes a first portion and second portion, wherein the first portion is in contact with the fourth surface of the main pole and the second portion is in contact with the third surface of the main pole.

5. The magnetic recording head of claim 4 , wherein the first portion of the non-magnetic conductive structure includes a first surface and a second surface opposite the first surface, wherein the first surface of the first portion of the non-magnetic conductive structure is in contact with the spin torque oscillator, and the second portion of the non-magnetic conductive structure includes a first surface and a second surface opposite the first surface, wherein the first surface of the second portion of the non-magnetic conductive structure is in contact with the spin torque oscillator.

6. The magnetic recording head of claim 5 , wherein the first surface of the first portion of the non-magnetic conductive structure, the first surface of the second portion of the non-magnetic conductive structure, and the second surface of the main pole are co-planar, and the second surface of the first portion of the non-magnetic conductive structure and the second surface of the second portion of the non-magnetic conductive structure are co-planar.

7. The magnetic recording head of claim 1 , wherein the spin torque oscillator comprises:
a first magnetic layer;
a second magnetic layer;
an interlayer disposed between the first magnetic layer and the second magnetic layer; and
a cap layer.

8. The magnetic recording head of claim 7 , wherein the first magnetic layer is disposed adjacent the main pole.

9. The magnetic recording head of claim 7 , wherein the first magnetic layer is a spin polarization layer.

10. The magnetic recording head of claim 9 , wherein the spin polarization layer comprises CoNi, CoPt, CoCrPt, CoPd, FePt, CoFePd, TbFeCo, CoMnGe, or combinations thereof.

11. The magnetic recording head of claim 7 , wherein the second magnetic layer is a field generating layer.

12. The magnetic recording head of claim 11 , wherein the field generation layer comprises a CoFe layer, or Co and Fe laminations.

13. The magnetic recording head of claim 7 , wherein the interlayer comprises Au, Ag, Cu, or AgSn.

14. The magnetic recording head of claim 7 , wherein the cap layer is an electrically conductive layer.

15. The magnetic recording head of claim 14 , wherein the electrically conductive layer comprises a Ru/Ta/Ru multi-layer stack.

16. The magnetic recording head of claim 1 , wherein the spin torque oscillator further has a second width at the media facing surface that is greater than a width of the main pole at the media facing surface.

17. The magnetic recording head of claim 1 , further comprising a trailing shield in contact with the spin torque oscillator.

18. The magnetic recording head of claim 1 , further comprising a dielectric layer disposed in contact with the non-magnetic conductive structure, the dielectric layer contacting the spin torque oscillator.

19. A magnetic media device comprising:
a magnetic recording head, comprising:
a main pole;
a spin torque oscillator in contact with the main pole, the spin torque oscillator having a first width in a cross-track direction; and
a non-magnetic conductive structure in contact with the main pole and the spin torque oscillator at a media facing surface, wherein the first width of the spin torque oscillator is greater than a collective width in the cross-track direction of the main pole and the non-magnetic conductive structure where the main pole and the non-magnetic conductive structure contact the spin torque oscillator.

20. The magnetic media device of claim 19 , further comprising a dielectric layer disposed in contact with the non-magnetic conductive structure, the dielectric layer contacting the spin torque oscillator.

Assignees

• Western Digital Tech Inc

Inventors

• Le Quang
• Ho Michael Kuok San
• Song Suping
• Baião De Albuquerque Goncalo Marcos

Classifications

• G11B5/1278 Primary

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

• G11B5/3133

  including layers not usually being a part of the electromagnetic transducer structure and providing additional features, e.g. for improving heat radiation, reduction of power dissipation, adaptations for measurement or indication of gap depth or other properties of the structure (G11B5/3106 takes precedence) · CPC title

• G11B5/3909

  Arrangements using a magnetic tunnel junction · CPC title

• G11B2005/0024

  Microwave assisted recording · CPC title

• G11B5/3146

  magnetic layers · CPC title