# US 10,770,104 B1 · Alternative designs for magnetic recording assisted by a single spin hall effect (SHE) layer in the write gap > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,770,104 B1 - Document ID: US10770104B1 - Status: Granted - Kind: B1 - Application number: 16/563,112 - Filed: 2019-09-06 - Granted: 2020-09-08 - Earliest claimed: 2019-09-06 - Assignees: Headway Technologies, Inc. - Applicants: Headway Technologies, Inc. - Inventors: Wenyu Chen; Yan Wu - Web page: https://patentgrep.com/patent/US10770104B1 ## CPC - G11B 5/3156: {providing interaction by induced or exchange coupling} - G11B 5/6082: {Design of the air bearing surface} - G11B 5/11: Shielding of head against electric or magnetic fields - G11B 5/1278: {specially adapted for magnetisations perpendicular to the surface of the record carrier} - G11B 5/187: 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) - G11B 5/315: {Shield layers on both sides of the main pole, e.g. in perpendicular magnetic heads} - G11B 5/37: using galvano-magnetic devices, e.g. Hall-effect devices (G11B5/39 takes precedence){using Hall or Hall-related effect, e.g. planar-Hall effect or pseudo-Hall effect} - G11B 5/372: {in magnetic thin films} - G11B 5/374: {Integrated structures} - G11B 5/4826: {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)} - G11B 2005/0005: {Arrangements, methods or circuits} - 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 Spin Hall Effect (SHE) assisted magnetic recording device is disclosed wherein a SHE layer comprising a giant Spin Hall Angle material is formed between a main pole (MP) trailing side and trailing shield (TS) bottom surface. The SHE layer may contact one or both of the MP and TS, and has a front side at the air bearing surface (ABS) or recessed therefrom. A first current (I1) is applied between the MP trailing side and SHE layer and is spin polarized to generate a first spin transfer torque that tilts a local MP magnetization to a direction that enhances a MP write field. A second current (I2) is applied between the SHE layer and TS and is spin polarized to generate a second spin transfer torque that tilts a local TS magnetization to a direction that increases the TS return field and improves bit error rate. ## Claims ### Claim 1 A Spin Hall Effect (SHE) assisted magnetic recording (SHAMR) device, comprising: (a) a main pole (MP) configured to generate a magnetic (write) field in a MP tip with a front side at an air bearing surface (ABS), and having a local magnetization that is proximate to a MP trailing side and substantially in a direction of a write gap (WG) flux field that is between the MP tip and a trailing shield, and across an adjoining WG; (b) the trailing shield (TS) with a front side at the ABS, and a local magnetization proximate to a bottom surface that faces the MP, and that is substantially in a direction of the WG flux field; and (c) a Spin Hall Effect (SHE) layer formed in the WG and having a bottom surface that contacts the MP trailing side and a top surface adjoining the TS bottom surface, and comprised of a Spin Hall Angle (SHA) material, wherein the SHE layer is configured to generate a first transverse spin transfer torque that tilts the local MP magnetization to a direction that is more orthogonal to the ABS thereby enhancing the write field when a first current (I1) is applied between the MP trailing side and the SHE layer, and is configured to generate a second transverse spin transfer torque that tilts the local TS magnetization to a direction that is more orthogonal to the ABS to increase a TS return field when a second current (I2) is applied between the TS and the SHE layer. ### Claim 2 (depends on 1) The SHAMR device of claim 1 wherein the SHE layer has a down-track thickness less than 12 nm between the MP trailing side and TS bottom surface. ### Claim 3 (depends on 1) The SHAMR device of claim 1, wherein said SHAMR device is configured to apply I1 from the MP trailing side to the SHE layer, and to apply I2 from the TS to the SHE layer when the SHE layer is comprised of a positive giant SHA material having an absolute value for SHA that is >0.05. ### Claim 4 (depends on 1) The SHAMR device of claim 1, wherein said SHAMR device is configured to apply I1 from the SHE layer to the MP trailing side, and to apply I2 from the SHE layer to the TS when the SHE layer is comprised of a negative giant SHA material having an absolute value for SHA that is >0.05. ### Claim 5 (depends on 1) The SHAMR device of claim 1, wherein the SHE layer has a front side at the ABS. ### Claim 6 (depends on 5) The SHAMR device of claim 5, wherein the SHE layer contacts a portion of the MP trailing side from the ABS to a height (h), and the SHE layer contacts a portion of the TS bottom surface from the ABS to a height (h1) where both of h and h1 are from 10 nm to 70 nm. ### Claim 7 (depends on 1) The SHAMR device of claim 1 wherein the SHE layer has a front side that is recessed from the ABS, and is separated from the ABS by a portion of the write gap. ### Claim 8 (depends on 1) The SHAMR device of claim 1, wherein said SHAMR device is configured such that I1 and I2 have no threshold current density requirement in order to generate the first and second transverse spin transfer torque, respectively. ### Claim 9 (depends on 1) The SHAMR device of claim 1 wherein the SHE layer is comprised of at least first and second sub-layers wherein the first SHE sub-layer is made of a different giant SHA material than the second SHE sub-layer, and wherein the first SHE sub-layer contacts the MP trailing side and is configured to generate the first transverse spin transfer torque, and the second SHE sub-layer adjoins the TS bottom surface and is configured to generate the second transverse spin transfer torque. ### Claim 10 (depends on 9) The SHAMR device of claim 9, wherein said SHAMR device is configured so that the first SHE sub-layer has a greater absolute value for SHA than the second SHE sub-layer, and the first transverse spin torque is larger than the second transverse spin transfer torque when an I1 current density is equal to an I2 current density. ### Claim 11 (depends on 1) The SHAMR device of claim 1, wherein the I1 and I2 are applied from a direct current (dc) source, and flow through a first lead and second lead between the dc source and the MP and TS, respectively, and flow through a third lead between a back portion of the SHE layer and the dc source. ### Claim 12 (depends on 1) The SHAMR device of claim 1 wherein the SHE layer has a backside that is a greater distance from the ABS than a throat height of the trailing shield. ### Claim 13 (depends on 1) A head gimbal assembly (HGA), comprising: (a) the SHAMR device of claim 1; and (b) a suspension that elastically supports the SHAMR device, wherein the suspension has a flexure to which the SHAMR device 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 14 (depends on 13) A magnetic recording apparatus, comprising: (a) the HGA of claim 13; (b) a magnetic recording medium positioned opposite to a slider on which the SHAMR device 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.