MAMR writer with low resistance MAMR stack

Patent metadata

Field	Value
Publication number	US-11049514-B2
Application number	US-202016932468-A
Country	US
Kind code	B2
Filing date	Jul 17, 2020
Priority date	Oct 5, 2017
Publication date	Jun 29, 2021
Grant date	Jun 29, 2021

Abstract

The present disclosure generally relates to a magnetic media drive employing a magnetic recording head. The head includes a main pole at a media facing surface (MFS), a trailing shield at the MFS, and a MAMR stack disposed between the main pole and the trailing shield at the MFS. The MAMR stack includes a seed layer and at least one magnetic layer. The seed layer is fabricated from a thermally conductive material having electrical resistivity lower than that of the main pole. The seed layer has a stripe height greater than a stripe height of the at least one magnetic layer. With the extended seed layer, the bias current from the trailing shield to the main pole spreads further away from the MFS along the extended seed layer before flowing into the main pole, reducing temperature rise at or near the MAMR stack, leading to improved write head reliability.

First claim

The invention claimed is:

1. A magnetic recording head, comprising:
a main pole;
a trailing shield;
a stack disposed between the main pole and the trailing shield, wherein the stack includes a seed layer comprising a first portion disposed at a media facing surface and a second portion recessed from the media facing surface, the first portion having a first stripe height, and at least one magnetic layer having a second stripe height, wherein the first stripe height is equal to the second stripe height, and wherein the second portion of the seed layer has a third stripe height greater than the first and second stripe heights; and
a current blocking layer disposed between the main pole and the seed layer.

2. The magnetic recording head of claim 1 , wherein the current blocking layer comprises MgO, AlOx, TaOx, or SiN.

3. The magnetic recording head of claim 1 , wherein the seed layer comprises a first layer comprising Cu, a second layer comprising W or Cr, and a third layer comprising Ru.

4. A magnetic recording head, comprising:
a main pole;
a trailing shield; and
a stack disposed between the main pole and the trailing shield, wherein the stack includes a seed layer comprising a first portion disposed at a media facing surface and a second portion recessed from the media facing surface, the first portion having a first stripe height, and at least one magnetic layer having a second stripe height, wherein the first stripe height is equal to the second stripe height, wherein the second portion of the seed layer has a third stripe height greater than the first and second stripe heights, and wherein the first portion of the seed layer comprises a different material than the second portion of the seed layer.

5. The magnetic recording head of claim 4 , wherein the first portion of the seed layer is disposed between the at least one magnetic layer and the main pole, and the second portion of the seed layer is disposed between the main pole and a dielectric layer.

6. The magnetic recording head of claim 4 , wherein the stack further comprises a spacer layer, the spacer layer comprising Cu or AgSn.

7. The magnetic recording head of claim 4 , wherein the second portion of the seed layer has a lower electrical resistivity than that of the main pole.

8. The magnetic recording head of claim 4 , wherein the at least one magnetic layer comprises NiFe, CoMnGe, or CoFe.

9. The magnetic recording head of claim 4 , wherein the at least one magnetic layer comprises a spin torque layer (STL).

10. The magnetic recording head of claim 4 , further comprising a trailing shield hot seed layer disposed between the stack and the trailing shield.

11. The magnetic recording head of claim 10 , wherein the trailing shield hot seed layer comprises FeCo, CoFeN, or FeXN where X includes at least one of Rh, Al, Ta, Zr, and Ti.

12. The magnetic recording head of claim 4 , wherein the seed layer and the at least one magnetic layer have a same width at the media facing surface.

13. The magnetic recording head of claim 4 , wherein the seed layer has a lower electrical resistivity than tantalum.

14. The magnetic recording head of claim 4 , wherein the at least one magnetic layer comprises a spin polarization layer (SPL), a field generation layer (FGL), and an interlayer disposed between the SPL and FGL.

15. The magnetic recording head of claim 4 , wherein the seed layer has a first width at the media facing surface, wherein the at least one magnetic layer has a second width at the media facing surface, and wherein the first width is greater than the second width.

16. The magnetic recording head of claim 4 , wherein the main pole does not include a leading taper.

17. The magnetic recording head of claim 4 , wherein the seed layer comprises non-magnetic metal.

18. The magnetic recording head of claim 4 , wherein the seed layer comprises at least one of copper, gold, silver, platinum, chromium, ruthenium, tungsten, tin, molybdenum, iridium, and rhodium.

19. A magnetic media drive comprising the magnetic recording head of claim 1 .

Assignees

• Western Digital Tech Inc

Inventors

• Ho Michael Kuok San
• Ding Yunfei
• Bai Zhigang
• Wei Yaguang
• Lam Terence
• Baião De Albuquerque Goncalo Marcos
• Shen Xinjiang
• Liu Feng Q

Classifications

• G11B2005/0024

  Microwave assisted recording · CPC title

• G11B5/3146

  magnetic layers · 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

• G11B5/1278

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

• G11B2005/0008

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