Ultimate double yoke (uDY) combined with one turn coil designs for perpendicular magnetic recording (PMR)

• US 10,643,640 B1
• Filed: 01/23/2019
• Issued: 05/05/2020
• Est. Priority Date: 01/23/2019
• Status: Active Grant

• Current Assignee: Headway Technologies Incorporated (TDK Corporation)
• Original Assignee: Headway Technologies Incorporated (TDK Corporation)
• Inventors: Liu, Yue, Liu, Ying, Tang, Yuhui, Lee, Jiun-Ting
• Primary Examiner(s): Miller, Brian E
• Application Number:
  US16/254,755
• Time in Patent Office: 468 Days
• CPC Class Codes: G11B 5/00826 comprising a plurality of single poles or gaps or groups thereof operative at the same time
• CPC Class Codes: G11B 5/012 Recording on, or reproducing or erasing from, magnetic disks G11B17/00, G11B19/00 take precedence
• CPC Class Codes: G11B 5/02 Recording, reproducing, or erasing methods; Read, write or erase circuits therefor
• CPC Class Codes: G11B 5/1278 specially adapted for magnetisations perpendicular to the surface of the record carrier
• CPC Class Codes: G11B 5/17 Construction or disposition of windings
• CPC Class Codes: G11B 5/23 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 Class Codes: G11B 5/3977 from different information tracks

Abstract

A PMR writer is disclosed wherein a top yoke (TY) is extended toward the air bearing surface (ABS) and below a top coil for faster saturation speed and better frequency extendibility without wide adjacent track erasure trade-off. The TY extension has a front side recessed 0.9-1.3 microns from the ABS, and has a backside below an inner corner of a PP3 trailing shield that is 2-2.6 microns from the ABS. TY thickness is from 0.3-0.8 micron and the TY is preferably used with a 1+1T coil design, and a PP3 trailing shield apex angle of 60° to 80° for better high data rate performance. Magnetic modeling shows rise time is shorter than for a conventional TY. The top yoke design is compatible with various base writer structures. When used in selectable double writers or selectable triple writers, each writer has a separate TY, main pole, and bottom yoke.

Claims

1. A perpendicular magnetic recording (PMR) writer structure comprised of a first PMR writer, the first PMR writer comprises:

(a) a main pole layer (MP) that has a top surface contacting a top yoke (TY), and a bottom surface adjoining a tapered bottom yoke (tBY), and a main pole (MP) tip at an air bearing surface (ABS);

(b) a bucking coil below the MP, and a driving coil above the MP that are configured in a 1+1T coil design;

(c) a trailing shield structure comprised of a hot seed (HS) layer and overlying write shield (WS) at the ABS, and an uppermost (PP3) trailing shield (TS) with a middle portion having a top surface that arches over the driving coil, and wherein the PP3 TS has a front portion that contacts a top surface of the WS, and a back portion that adjoins a top surface of the TY; and

(d) the TY with a configuration, comprising;

(1) a front portion having a backside below an inner corner of the PP3 TS back portion and at a yoke length (YL) from the ABS, and wherein a front side thereof is at a first height (TYd) from the ABS, and is below the driving coil; and

(2) a back portion with a front side adjoining the TY front portion backside and wherein both of the TY back portion and TY front portion have a thickness t, and the TY back portion has a top surface that adjoins the PP3 TS back portion.

2. The PMR writer structure of claim 1 further comprising a second PMR writer on a slider in a selectable dual writer (SDW), or second and third PMR writers on a slider in a selectable triple writer (STW).

3. The PMR writer structure of claim 2 wherein the first and second PMR writers in the SDW, or the first, second, and third PMR writers in the STW have shared trailing shield structures but separate main poles, separate top yokes, and separate tapered bottom yokes.

4. The PMR writer structure of claim 2 wherein the first and second PMR writers in the SDW, or the first, second, and third PMR writers in the STW share all magnetic components in a leading loop and a trailing loop for magnetic flux return but have separate main poles, separate top yokes, and separate tapered bottom yokes.

5. The PMR writer structure of claim 1 wherein the first PMR writer has a non-dual write shield (nDWS) design comprising a leading loop for magnetic flux return from a magnetic medium to the MP wherein the leading loop is terminated at a leading shield, and comprises a trailing loop for magnetic flux return that is comprised of the trailing shield structure at the ABS, the PP3 TS, and the TY back portion.

6. The PMR writer structure of claim 1 wherein the first PMR writer has a recessed dual write shield with no back gap connection (rDWS no BGC) design comprising a leading loop for magnetic flux return from a magnetic medium to the MP wherein the leading loop is terminated at a return path (RTP), and is comprised of a leading shield at the ABS, the RTP, and a magnetic connection between the leading shield and RTP, and comprises a trailing loop for magnetic flux return that is comprised of the trailing shield structure at the ABS, the PP3 TS, and the TY back portion.

7. The PMR writer structure of claim 1 wherein the first PMR writer has a rDWS BGC design comprising a leading loop for magnetic flux return from a magnetic medium to the MP wherein the leading loop is comprised of a leading shield at the ABS, a return path (RTP), a magnetic connection between the leading shield and RTP, a lower back gap (LBG) layer on the RTP, and a back gap connection (BGC) on the LBG layer wherein the BGC adjoins a bottom of the MP, and comprises a trailing loop for magnetic flux return that is comprised of the trailing shield structure at the ABS, the PP3 TS, and the TY back portion.

8. The PMR writer structure of claim 1 wherein the first PMR writer has a DWS BGC design comprising a leading loop for magnetic flux return from a magnetic medium to the MP wherein the leading loop is comprised of a leading shield and a magnetic connection to a return path (RTP) at the ABS, the RTP that is recessed from the ABS, a lower back gap (LBG) layer on the RTP, and a back gap connection (BGC) on the LBG layer wherein the BGC adjoins a bottom of the MP, and comprises a trailing loop for magnetic flux return that is comprised of the trailing shield structure at the ABS, the PP3 TS, and the TY back portion.

9. The PMR writer structure of claim 1 wherein the PP3 TS front portion has an inner side that forms an apex angle θ

from 60 degrees to 80 degrees with respect to a plane that is orthogonal to the ABS and comprises the TY back portion top surface.

10. The PMR writer structure of claim 1 wherein the thickness t is from 0.3 micron to 0.8 micron.

11. The PMR writer structure of claim 1 wherein the YL is from 2 microns to 2.6 microns.

12. The PMR writer structure of claim 1 wherein the first height (TYd) is from 0.9 micron to 1.3 microns.

13. The PMR writer structure of claim 7 further comprised of a second PMR writer in a selectable dual writer (SDW), or second and third PMR writers in a selectable triple writer (STW), and wherein each of the first and second PMR writers in the SDW, or each of the first, second and third PMR writers in the STW are formed on a slider and have a shared leading shield (LS), shared return path (RTP), and shared magnetic connection between the LS and RTP, but have separate LBG, BGC, main poles, top yokes, and tapered bottom yokes.

14. A head gimbal assembly (HGA) comprising:

(a) the PMR writer structure of claim 1; and

(b) a suspension that elastically supports the PMR writer structure, wherein the suspension has a flexure to which the PMR writer structure is joined, a load beam with one end connected to the flexure, and a base plate connected to the other end of the load beam.

15. A magnetic recording apparatus, comprising:

(a) the HGA of claim 14;

(b) a magnetic recording medium positioned opposite to a slider on which the PMR writer structure is formed;

(c) a spindle motor that rotates and drives the magnetic recording medium; and

(d) a device that supports the slider, and that positions the slider relative to the magnetic recording medium.