Writer with narrower high moment trailing shield

Patent metadata

Field	Value
Publication number	US-11355141-B2
Application number	US-202017115065-A
Country	US
Kind code	B2
Filing date	Dec 8, 2020
Priority date	Jul 10, 2019
Publication date	Jun 7, 2022
Grant date	Jun 7, 2022

Abstract

A PMR (perpendicular magnetic recording) write head configured for microwave assisted magnetic recording (MAMR) in the form of spin assisted writing (SAW) or spin torque oscillation (STO) includes a spin-torque oscillator (STO) or SAW device and trailing shield formed of high moment magnetic material (HMTS). By patterning the STO or SAW and the HMTS in a simultaneous process the HMTS and the STO or SAW layers are precisely aligned and have very similar cross-track widths. In addition, the write gap at an off-center location has a thickness that is independent from its center-track thickness and the write gap total width can have a flexible range whose minimum value is the same width as the STO or SAW width.

First claim

We claim:

1. A perpendicular magnetic writer (PMR) configured for spin assisted magnetic writing (SAW), comprising:
a magnetic main pole (MP) emerging at an air-bearing surface (ABS) and having a trapezoidal ABS face that is wider at a trailing edge surface than at a leading-edge surface and wherein said trailing and leading-edge surfaces are connected by symmetrically formed side edge surfaces;
a dielectric layer conformally surrounding said MP and forming a uniform gap adjacent to both side edge surfaces of said MP and said leading edge surface of said MP; wherein
said dielectric layer has an upper planar surface that is coplanar with said trailing edge surface of said MP and that extends symmetrically away from said MP from said uniform gaps;
a spin-assisted writing device (SAW) formed on the trailing edge side of said MP and having the same width as said trailing edge side and aligned with it; wherein
said SAW is configured to provide a magnetization opposite to the direction of a gap field and, thereby, enhances the magnetic field of said MP when said magnetic field is impinging on an adjacent recording media;
a high-moment trailing shield (HMTS) formed on said SAW and having the same width of said SAW and aligned with it;
a write gap (WG) layer formed on said upper planar surface of said dielectric layer and having a uniform thickness, said layer extending symmetrically from contiguity with left and right edges of the combined SAW and HMTS.

2. The PMR of claim 1 further comprising a trailing shield formed contacting top and side edges of said write gap layer, the top edge of said HMTS, and the top planar surface of said dielectric layer that extends symmetrically and laterally beyond said WG layer.

3. The PMR of claim 2 wherein said HMTS is a layer of magnetic material having a Bs between approximately 18 kG and 24 kG and having a width between 10 nm and 360 nm.

4. The PMR of claim 1 wherein said HMTS is a layer of magnetic material having a Bs between approximately 18 kG and 24 kG and having a width between 10 nm and 360 nm.

5. The PMR of claim 1 wherein said WG has a wider cross-track width than PWA, the maximum width of the pole, said width ranging between approximately 100 nm and 1 μm.

6. The PMR of claim 1 wherein said WG layer is a layer of non-magnetic material and wherein the minimum total width of said WG layer is the width of said SAW and the maximum width can vary between approximately 1 Onm and 1 μm.

7. The PMR of claim 1 wherein off-center WG thickness can range between approximately 2 nm and 50 nm.

8. The PMR of claim 1 wherein said HMTS has a narrower width than the WG and is preferably aligned with said STO, but wherein said HMTS width can range between approximately 10 nm and 500 nm.

9. The PMR of claim 1 wherein said HMTS has a thinner down-track thickness than said prior-art structure used for comparison purposes, said thickness ranging from between approximately 5 nm and 500 nm.

10. A head gimbal assembly, comprising
the PMR write head of claim 1 mounted on a slider;
a suspension that elastically supports said slider-mounted PMR read/write head, wherein
said suspension has a flexure to which said slider-mounted PMR read/write head is joined, a load beam with one end connected to said flexure and a base plate connected to the other end of said load beam.

11. A HDD (Hard Disk Drive), comprising:
the head gimbal assembly of claim 10 ;
a magnetic recording medium positioned opposite to said slider-mounted TAMR;
a spindle motor that rotates and drives said magnetic recording medium;
a device that supports the slider and that positions said slider relative to said magnetic recording medium.

Assignees

• Headway Tech Inc

Inventors

• Tang Yuhui
• Liu Ying

Classifications

• G11B5/1278 Primary

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

• G11B5/3146

  magnetic layers · 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

• G11B5/4826

  Mounting, aligning or attachment of the transducer head relative to the arm assembly, e.g. slider holding members, gimbals, adhesive (G11B5/484 takes precedence; details of head housings or structures G11B5/10, G11B5/127; adjustment relative to the record carrier G11B5/56) · CPC title

• G11B5/11

  Shielding of head against electric or magnetic fields · CPC title