Perpendicular magnetic recording (PMR) writer with hybrid shield layers

Patent metadata

Field	Value
Publication number	US-9626990-B2
Application number	US-201615361726-A
Country	US
Kind code	B2
Filing date	Nov 28, 2016
Priority date	Sep 9, 2015
Publication date	Apr 18, 2017
Grant date	Apr 18, 2017

Abstract

A perpendicular magnetic recording writer with an all wrap around (AWA) shield design wherein one or more of the leading shield, trailing shield, and side shields comprises a magnetic hot seed layer made of a >19 kG to 24 kG material that adjoins a gap layer, and a side of the hot seed layer opposite the gap layer adjoins a high damping magnetic layer made of a 10-16 kG material (or a 16-19 kG material in the trailing shield) having a Gilbert damping parameter a >0.04. In one embodiment, the high damping magnetic layer is FeNiRe with a Re content of 3 to 15 atomic %. The main pole leading and trailing sides may be tapered. Side shields may have a single taper or dual taper structure. Higher writer speed with greater areal density capability is achieved.

First claim

We claim:

1. A perpendicular magnetic recording (PMR) writer, comprising:
(a) a main pole with a leading side and a trailing side, the leading side adjoins a lead gap at an air bearing surface (ABS) and the trailing side adjoins a write gap at the ABS;
(b) a gap layer surrounding the main pole, the gap layer includes the lead gap, the write gap, and a side gap which contacts a side of the main pole formed between the trailing side and leading side on each side of a center plane that bisects the main pole in a direction orthogonal to the ABS; and
(c) an all wrap around (AWA) shield structure wherein one or more of a leading shield, side shields, and trailing shield have a composite structure, comprising:
(1) a hot seed layer made of a >19 to 24 kG material having a first side that faces the main pole and adjoins the gap layer, and a second side that is opposite the first side; and
(2) a high damping (HD) magnetic layer made of a 10-16 kG material in the side shields and leading shield, and a 16-19 kG material in the trailing shield, the HD magnetic layer has a Gilbert damping parameter α>0.04 and a first side that adjoins the second side of the hot seed layer.

2. The PMR writer of claim 1 wherein the trailing shield has the composite structure and further comprises a 16-19 kG magnetic layer that adjoins a second side of the HD magnetic layer in the trailing shield, the second side is opposite the first side of the HD magnetic layer.

3. The PMR writer of claim 1 wherein the high damping magnetic layer is comprised of an alloy that is one of FeNiM, FeCoM, or FeCoNiM wherein M is one of Re, Os, Ir, Rh, Ti, Ta, V, Cr, W, Mn, Mo, Cu, Zr, Nb, Hf, Ru, Pd, Pt, Ag, and Au, and a M content is about 3 to 15 atomic % in the alloy.

4. The PMR writer of claim 1 wherein the main pole leading side and main pole trailing side each have a tapered portion with a front end at the ABS, the leading side tapered portion extends to a second end that connects with a second main pole leading side aligned orthogonal to the ABS, and the trailing side tapered portion extends to a second end that connects with a second main pole trailing side aligned orthogonal to the ABS.

5. The PMR writer of claim 4 wherein the leading shield has the composite structure, and wherein each of the hot seed layer, and the HD magnetic layer in the leading shield have the first side formed substantially parallel to the leading side tapered portion, and have a back side that is formed at a first height from the ABS.

6. The PMR writer of claim 4 wherein the trailing shield has the composite structure, and wherein each of the hot seed layer, and the HD magnetic layer in the trailing shield have a first portion with the first side formed substantially parallel to the trailing side tapered portion, and have a back side that is formed at a third height from the ABS.

7. The PMR writer of claim 5 wherein each of the hot seed layer and the HD magnetic layer in the leading shield are further comprised of a second portion that adjoins the back side of the first portion thereof at the first height and extends orthogonal to the ABS and to a second height greater than the first height.

8. The PMR writer of claim 6 wherein each of the hot seed layer and the HD magnetic layer in the trailing shield are further comprised of a second portion that adjoins the back side of the first portion thereof at the third height and extends orthogonal to the ABS and to a fourth height greater than the third height.

9. The PMR writer of claim 1 wherein each side shield has the composite structure and wherein each of the hot seed layer and the HD magnetic layer in each side shield have the first side formed substantially parallel to a nearest side of the main pole, and have a back side that is formed a first distance from the ABS.

10. The PMR writer of claim 6 wherein the HD magnetic layer in the trailing shield has a thickness from about 30 to 300 nm.

11. A perpendicular magnetic recording (PMR) writer, comprising:
(a) a main pole with a leading side and a trailing side, the leading side adjoins a lead gap at an air bearing surface (ABS) and the trailing side adjoins a write gap at the ABS;
(b) a gap layer surrounding the main pole, the gap layer includes the lead gap, the write gap, and a side gap which contacts a side of the main pole formed between the trailing side and leading side on each side of a center plane that bisects the main pole in a direction orthogonal to the ABS; and
(c) an all wrap around (AWA) shield structure wherein a leading shield and side shields each have a high damping (HD) magnetic layer made of a 10-16 kG material with a Gilbert damping parameter α>0.04 and having a first side that adjoins the lead gap and side gaps, respectively, and wherein a trailing shield has a composite structure, comprising:
(1) a hot seed layer made of a >19 to 24 kG material having a first side that adjoins a side of the write gap layer that faces away from the main pole, and a second side that is opposite the first side;
(2) a HD magnetic layer made of a 16-19 kG material with a Gilbert damping parameter α>0.04 and a first side that adjoins the second side of the hot seed layer, and having a second side that is opposite the first side of the HD magnetic layer; and
(3) a magnetic layer made of a 16-19 kG material with a first side that adjoins the second side of the HD magnetic layer.

12. The PMR writer of claim 11 wherein the high damping magnetic layer is comprised of an alloy that is one of FeNiM, FeCoM, or FeCoNiM where M is one of Re, Os, Ir, Rh, Ti, Ta, V, Cr, W, Mn, Mo, Cu, Zr, Nb, Hf, Ru, Pd, Pt, Ag, and Au, and a M content is about 3 to 15 atomic % in the alloy.

13. The PMR writer of claim 11 wherein the main pole leading side and main pole trailing side each have a tapered portion with a front end at the ABS, the leading side tapered portion extends to a second end that connects with a second main pole leading side aligned orthogonal to the ABS, and the trailing side tapered portion extends to a second end that connects with a second main pole trailing side aligned orthogonal to the ABS.

14. The PMR writer of claim 11 wherein the leading shield contacts each of the two side shields, and has a back side at a first height from the ABS.

15. The PMR writer of claim 11 wherein each of the hot seed layer, and the HD magnetic layer in the trailing shield have a first portion with the first side formed substantially parallel to the trailing side tapered portion, and have a back side that is formed at a third height from the ABS.

16. The PMR writer of claim 14 wherein the leading shield is further comprised of a second portion that adjoins the back side of the first portion at the first height and extends orthogonal to the ABS and to a second height.

17. The PMR writer of claim 15 wherein each of the hot seed layer and the HD magnetic layer in the trailing shield are further comprised of a second portion that adjoins the back side of the first portion thereof at the third height and extends orthogonal to the ABS and to a fourth height greater than the third height.

18. The PMR writer of claim 11 wherein the HD magnetic layer in the trailing shield has a thickness from about 30 to 300 nm.

Assignees

• Headway Tech Inc

Inventors

• Tang Yuhui
• Wei Yaguang
• Lee Jiun-Ting

Classifications

• G11B5/187

  Structure or manufacture of the surface of the head in physical contact with, or immediately adjacent to the recording medium; Pole pieces; Gap features (G11B5/265, {G11B5/29} , G11B5/31 take precedence) · CPC title

• G11B5/3169

  Working or finishing the interfacing surface of heads, e.g. lapping of heads · CPC title

• G11B5/112 Primary

  Manufacture of shielding device · CPC title

• G11B5/3116

  Shaping of layers, poles or gaps for improving the form of the electrical signal transduced, e.g. for shielding, contour effect, equalizing, side flux fringing, cross talk reduction between heads or between heads and information tracks (G11B5/3113, G11B5/245 take precedence) · CPC title

• G11B5/315

  Shield layers on both sides of the main pole, e.g. in perpendicular magnetic heads · CPC title