# US 10,770,103 B1 · Perpendicular magnetic recording (PMR) writer with narrow high moment trailing shield > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,770,103 B1 - Document ID: US10770103B1 - Status: Granted - Kind: B1 - Application number: 16/423,910 - Filed: 2019-05-28 - Granted: 2020-09-08 - Earliest claimed: 2019-05-28 - Assignees: Headway Technologies, Inc. - Applicants: Headway Technologies, Inc. - Inventors: Ying Liu; Jiun-Ting Lee; Min Li; Yuhui Tang - Web page: https://patentgrep.com/patent/US10770103B1 ## CPC - G11B 5/315: {Shield layers on both sides of the main pole, e.g. in perpendicular magnetic heads} - G11B 5/6082: {Design of the air bearing surface} - G11B 5/1278: {specially adapted for magnetisations perpendicular to the surface of the record carrier} - G11B 5/3912: {Arrangements in which the active read-out elements are transducing in association with active magnetic shields, e.g. magnetically coupled shields (G11B5/3916 takes precedence)} - G11B: INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER (recording measured values in a way that does not require playback through a transducer G01D9/00; recording or playback apparatus using mechanically marked tape, e.g. punched paper tape, or using unit records, e.g. punched or magnetically marked cards G06K; transferring data from one type of record carrier to another G06K1/18; circuits for coupling output of reproducer to radio receiver H04B1/20; gramophone pick-ups or like acoustic electromechanical transducers or circuits therefor H04R) ## Abstract A PMR writer is disclosed wherein the trailing shield (TS) structure has a high moment trailing shield (HMTS) with a saturation (Bs) from 19 kiloGauss (kG) to 24 kG and a width (w) from 10 nm to 500 nm and is separated from the main pole (MP) trailing side at an air bearing surface (ABS) by a first write gap (WG) portion of thickness t1. A second WG portion of thickness t2 where t2>t1 adjoins the sides of the first WG portion, and has an outer side at a cross-track distance ½ w1 from a center plane that bisects the MP trailing side where w1>w. A first TS layer is formed on the HMTS and on the second WG portion, and has an outer side coplanar with the second WG portion outer side. Accordingly, there is improvement in tracks per inch capability and adjacent track interference. ## Claims ### Claim 1 A perpendicular magnetic recording (PMR) writer, comprising: (a) a main pole with a leading side and a trailing side at an air bearing surface (ABS), and two sides that connect the leading side and trailing side and are formed equidistant from a center plane that is orthogonal to the ABS; (b) a side shield on each side of the center plane that is separated from one of the MP sides by a side gap, and wherein an inner section of a top surface of each side shield is at a first plane that includes the MP trailing side and a side gap top surface at the ABS; (c) a trailing shield structure, comprising; (1) a high moment trailing shield (HMTS) having a saturation (Bs) value from 19 kiloGauss (kG) to 24 kG and a first cross-track width (w), and wherein the HMTS has a bottom surface separated from the MP trailing side by a first portion of a write gap (WG) having a first thickness (t1) and width w; (2) a first trailing shield (TS) layer having a width w1 where w1 is substantially greater than w, and wherein the first TS layer is formed on a top surface of the HMTS and on a top surface of a second portion of WG where a side of the second WG portion adjoins a side of the first WG portion on each side of the center plane, the second WG portion has a thickness t2 where t2>t1; and (3) a second TS layer formed on a top surface of the first TS layer, and that contacts an outer section of each side shield top surface at a cross-track distance from ½ w1 from the center plane to a far side of the trailing shield structure, and (d) the second WG portion that is formed on a top surface of each inner SS section, and has an outer side that is coplanar with a first TS layer side at the cross-track distance of ½ w1 from the center plane. ### Claim 2 (depends on 1) The PMR writer of claim 1 wherein the first TS layer has a Bs value from 4 kG to 22 kG. ### Claim 3 (depends on 1) The PMR writer of claim 1 wherein the second TS layer has a Bs value from 16 kG to 24 kG. ### Claim 4 (depends on 1) The PMR writer of claim 1 wherein the first width is from 10 nm to 500 nm. ### Claim 5 (depends on 1) The PMR writer of claim 1 wherein the MP trailing side is tapered and connects with a MP top surface at a first height (h1) from the ABS. ### Claim 6 (depends on 5) The PMR writer of claim 5 wherein the trailing shield structure has a backside at a second height (h2) from the ABS where h2>h1. ### Claim 7 (depends on 1) The PMR writer of claim 1 wherein t1 is from 5 nm to 50 nm, and t2 is from 5 nm to 100 nm. ### Claim 8 (depends on 1) The PMR writer of claim 1 wherein the HMTS has a thickness between 5 nm and 200 nm. ### Claim 9 (depends on 1) The PMR writer of claim 1 wherein the top surface of the first TS layer is non-planar such that a first section thereof above the HMTS is a greater distance from the first plane than a second section above the second portion of WG on each side of the center plane. ### Claim 10 (depends on 1) The PMR writer of claim 1 wherein one or more of the HMTS, first TS layer, and second TS layer is comprised of a high damping (HD) material with a damping parameter ≥0.04. ### Claim 11 (depends on 1) A head gimbal assembly (HGA), comprising: (a) the PMR writer of claim 1; and (b) a suspension that elastically supports the PMR writer, wherein the suspension has a flexure to which the PMR writer 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. ### Claim 12 (depends on 11) A magnetic recording apparatus, comprising: (a) the HGA of claim 11; (b) a magnetic recording medium positioned opposite to a slider on which the PMR writer 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.