Energy assisted magnetic recording head having improved areal density capability

Patent metadata

Field	Value
Publication number	US-11557315-B2
Application number	US-202117644231-A
Country	US
Kind code	B2
Filing date	Dec 14, 2021
Priority date	Jul 19, 2019
Publication date	Jan 17, 2023
Grant date	Jan 17, 2023

Abstract

The present disclosure generally relates to a magnetic media drive employing a magnetic recording head. The magnetic recording head comprises a main pole, an EAMR stack disposed on the main pole, and a trailing shield disposed on the EAMR stack. The EAMR stack comprises a seed layer disposed on the main pole, a spin torque layer disposed on the seed layer, and a spacer layer disposed on the spin torque layer. At least one surface of the spacer layer in contact with the spin torque layer has a smaller or reduced area than the spin torque layer. The at least one surface of the spacer layer in contact with the spin torque layer is recessed from a media facing surface and has a smaller cross-track width than the spin torque layer and a smaller width in the stripe height direction than the spin torque layer.

First claim

What is claimed is:

1. A magnetic recording head, comprising:
a main pole disposed at a media facing surface;
a seed layer disposed on the main pole, the seed layer being disposed at the media facing surface;
a spin torque layer disposed on the seed layer, the spin torque layer having a first cross-track width, wherein the spin torque layer is disposed at the media facing surface; and
a spacer layer disposed on the spin torque layer, the spacer layer having a first surface recessed from a media facing surface.

2. The magnetic recording head of claim 1 , wherein the spacer layer has a second cross-track width that is less than the first cross-track width.

3. The magnetic recording head of claim 1 , wherein the spacer layer has a rectangular shape.

4. The magnetic recording head of claim 1 , wherein a first surface of the spin torque layer is disposed at the media facing surface.

5. The magnetic recording head of claim 1 , wherein the spin torque layer has a first stripe height, wherein the spacer layer has a second stripe height, and wherein the first stripe height is greater than the second stripe height.

6. The magnetic recording head of claim 1 , wherein the spacer layer is centered on the spin torque layer such that a second surface of the spacer layer opposite the first surface and the media facing surface is unaligned or non-conformal with a second surface of the spin torque layer opposite the first surface and the media facing surface.

7. A data storage device comprising the magnetic recording head of claim 1 .

8. A magnetic recording head, comprising:
a main pole;
a seed layer disposed on the main pole, the seed layer being disposed at a media facing surface;
a spin torque layer disposed on the seed layer, the spin torque layer having a first height in a stripe height direction, wherein a first surface of the spin torque layer is disposed at the media facing surface;
a spacer layer disposed on the spin torque layer, the spacer layer having a first surface and a second surface; and
a trailing shield disposed on the first surface of the spacer layer, wherein:
the second surface of the spacer layer is disposed on the spin torque layer, and
an end of the second surface is recessed from the media facing surface.

9. The magnetic recording head of claim 8 , wherein a first surface of the trailing shield is disposed at the media facing surface, and wherein an end of the first surface of the spacer layer is disposed at the media facing surface.

10. The magnetic recording head of claim 9 , wherein the spacer layer comprises a third surface connecting the first and second surfaces, wherein the third surface connects to the first surface at the media facing surface, and wherein the third surface connects to the second surface at a location recessed from the media facing surface.

11. The magnetic recording head of claim 8 , wherein the first surface has a height that is equal to the first height of the spin torque layer in the stripe height direction.

12. The magnetic recording head of claim 8 , wherein a second surface of the spin torque layer disposed opposite the media facing surface is aligned with at least a portion of a second surface of the trailing shield.

13. The magnetic recording head of claim 8 , wherein a second surface of the spin torque layer disposed opposite the media facing surface is conformal or aligned with a surface of the spacer layer.

14. The magnetic recording head of claim 8 , a surface of the seed layer that is opposite the media facing surface is at least partially aligned with a surface of the trailing shield that is opposite the media facing surface.

15. A data storage device comprising the magnetic recording head of claim 8 .

16. A magnetic recording head, comprising:
a main pole;
a seed layer disposed on the main pole;
a spin torque layer disposed on the seed layer; and
a spacer layer disposed on the spin torque layer, the spacer layer having a trapezoidal shape, wherein:
a first surface of the spacer layer disposed adjacent to and in contact with the spin torque layer has a first cross-track width less than a second cross-track width of a second surface of the spacer layer disposed opposite the first surface of the spacer layer,
a surface of the spin torque layer opposite a media facing surface is aligned with a surface of the seed layer that is opposite the media facing surface,
the surface of the spin torque layer opposite the media facing surface is aligned with a surface of the spacer layer that is opposite the media facing surface, and
a cross-track width of the spin torque layer is equal to the second cross-track width of the second surface of the spacer layer.

17. The magnetic recording head of claim 16 , wherein a third surface of the spacer layer is recessed from the media facing surface.

18. The magnetic recording head of claim 16 , wherein a stripe height of the spin torque layer is equal to the second cross-track width of the second surface of the spacer layer.

19. The magnetic recording head of claim 16 , wherein the spin torque layer is disposed at the media facing surface, and wherein the first surface of the spacer layer is recessed from the media facing surface.

20. A data storage device comprising the magnetic recording head of claim 16 .

Assignees

• Western Digital Tech Inc

Inventors

• Song Suping
• Li Zhanjie
• Lam Terence
• Shi Changqing
• Guan Lijie

Classifications

• 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

• G11B2005/0018

  by current biasing control or regulation · CPC title

• G11B5/1278 Primary

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

• G11B5/23

  Gap features {(G11B5/1871, G11B5/1875, G11B5/265, G11B5/29, G11B5/488 and subgroups, G11B5/4907 and subgroups, G11B5/4969 and subgroups take precedence)} · CPC title

• G11B2005/0024

  Microwave assisted recording · CPC title