# US 8,786,984 B2 · Perpendicular magnetic write head having a current carrying element for in-plane field assisted magnetic recording > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 8,786,984 B2 - Document ID: US8786984B2 - Status: Granted - Kind: B2 - Application number: 13/297,106 - Filed: 2011-11-15 - Published: 2013-05-16 - Granted: 2014-07-22 - Earliest claimed: 2011-11-15 - Assignees: HGST Netherlands B.V. - Applicants: Sarbanoo Das; Masafumi Mochizuki - Inventors: Sarbanoo Das; Masafumi Mochizuki - Web page: https://patentgrep.com/patent/US8786984B2 ## CPC - G11B 5/1278: {specially adapted for magnetisations perpendicular to the surface of the record carrier} - G11B 5/3116: {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)} - G11B 5/314: {where the layers are extra layers normally not provided in the transducing structure, e.g. optical layers (G11B5/3196 takes precedence)} - G11B 5/315: {Shield layers on both sides of the main pole, e.g. in perpendicular magnetic heads} - G11B 2005/0002: {Special dispositions or recording techniques} - 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 In one embodiment, a magnetic head includes a main pole configured to produce a magnetic writing field applied to a magnetic medium at an overall angle with respect to a magnetic anisotropy axis which is oriented in a direction perpendicular to a plane of a surface of the magnetic medium, and at least one current carrying element positioned near a media facing surface of the main pole configured to produce an assisting magnetic field applied in a cross-track direction parallel to the plane of the surface of the magnetic medium. In another embodiment, a method includes applying a writing magnetic field to write data to a magnetic medium and applying an assisting magnetic field to the magnetic medium for assisting the writing magnetic field, the assisting magnetic field being applied in a cross-track direction of the magnetic medium and parallel to a plane of a surface of the magnetic medium. ## Claims ### Claim 1 A system, comprising: a magnetic recording medium; and a magnetic head, comprising: a main pole configured to produce a magnetic writing field applied to a magnetic medium at an overall angle with respect to a magnetic anisotropy axis, the magnetic anisotropy axis being oriented in a direction perpendicular to a plane of a surface of the magnetic medium; and at least one current carrying element positioned near a media facing surface of the main pole configured to produce an assisting magnetic field applied in a cross-track direction parallel to the plane of the surface of the magnetic medium. ### Claim 2 (depends on 1) The system as recited in claim 1, wherein a portion of the magnetic writing field emanates from a center portion of the main pole and is applied to the magnetic medium in a direction about perpendicular to the surface of the magnetic medium. ### Claim 3 (depends on 1) The system as recited in claim 1, wherein a portion of the magnetic writing field emanates from edges of the main pole and is applied to the magnetic medium at an angle to perpendicular to the surface of the magnetic medium, wherein the angle to perpendicular is greater than 0°. ### Claim 4 (depends on 3) The system as recited in claim 3, wherein the angle to perpendicular is between about 10° and about 90° and the overall angle is between about 25° and about 45°. ### Claim 5 (depends on 3) The system as recited in claim 3, wherein the angle to perpendicular is between about 25° and about 45° and the overall angle is about 30°. ### Claim 6 (depends on 1) The system as recited in claim 1, wherein the at least one current carrying element comprises a bundle of wires, the wires comprising a conductive material, wherein each wire in the bundle is oriented in about a same direction. ### Claim 7 (depends on 6) The system as recited in claim 6, wherein the conductive material comprises carbon nanotubes. ### Claim 8 (depends on 1) The system as recited in claim 1, wherein an entire portion of two current carrying elements positioned near the media facing surface of the main pole are positioned longitudinally inline with a down-track direction on either side of the main pole in a cross-track direction. ### Claim 9 (depends on 8) The system as recited in claim 8, the magnetic head further comprising: an insulator layer between the two current carrying elements and the main pole; electro-conductive connectors positioned on each longitudinal end of the two current carrying elements; a trailing shield positioned on a trailing side of the main pole; a leading shield positioned on a leading side of the main pole; and side shields positioned on either side of the main pole in the cross-track direction. ### Claim 10 (depends on 1) The system as recited in claim 1, wherein the at least one current carrying element comprises a bundle of wires positioned longitudinally inline with a down-track direction on a trailing side of the main pole. ### Claim 11 (depends on 10) The system as recited in claim 10, the magnetic head further comprising: an electro-conductive connector positioned on each longitudinal end of the bundle of wires; an insulator layer positioned between one electro-conductive connector and the main pole; a trailing shield positioned on a trailing side of the main pole; and an insulator layer positioned between another electro-conductive connector and the trailing shield. ### Claim 12 (depends on 1) The system as recited in claim 1, wherein a magnitude and/or a direction of current passed through a plurality of current carrying elements is individually controllable for each current carrying element. ### Claim 13 (depends on 1) The system as recited in claim 1, further comprising: a drive mechanism for passing the magnetic recording medium over the magnetic head; and a controller electrically coupled to the magnetic head for controlling operation of the magnetic head. ### Claim 14 A method, comprising: applying a writing magnetic field to a magnetic medium for writing data to the magnetic medium; and applying an assisting magnetic field to the magnetic medium for assisting the writing magnetic field, wherein the assisting magnetic field is only applied in a cross-track direction of the magnetic medium and parallel to a plane of a surface of the magnetic medium. ### Claim 15 (depends on 14) The method as recited in claim 14, wherein the writing magnetic field is produced by a main pole of a magnetic head and a portion thereof is applied to the magnetic medium in a direction about perpendicular to the surface of the magnetic medium. ### Claim 16 (depends on 14) The method as recited in claim 14, wherein the writing magnetic field is produced by a main pole of a magnetic head and a portion thereof is applied to the magnetic medium at an angle with respect to a direction about perpendicular to the surface of the magnetic medium. ### Claim 17 (depends on 14) The method as recited in claim 14, wherein the assisting magnetic field is produced by at least one current carrying element positioned near a media facing surface of a main pole of a magnetic head. ### Claim 18 (depends on 17) The method as recited in claim 17, wherein the at least one current carrying element comprises two bundles of carbon nanotubes being positioned on either side of the main pole in the cross-track direction. ### Claim 19 (depends on 17) The method as recited in claim 17, wherein the at least one current carrying element comprises at least one bundle of carbon nanotubes being positioned on a trailing side of the main pole in a down-track direction. ### Claim 20 A magnetic data storage system, comprising: a magnetic medium; at least one magnetic head; a drive mechanism for passing the magnetic medium over the at least one magnetic head; and a controller electrically coupled to the at least one magnetic head for controlling operation of the at least one magnetic head, wherein the at least one magnetic head comprises: a main pole configured to produce a magnetic writing field applied to the magnetic medium at an overall angle with respect to a magnetic anisotropy axis which is in a direction perpendicular to a plane of a surface of the magnetic medium; two bundles of carbon nanotubes capable of carrying current substantially positioned longitudinally inline with a down-track direction on either side of the main pole in a cross-track direction near a media facing surface of the main pole, the bundles of carbon nanotubes being configured to produce an assisting magnetic field applied only in a cross-track direction parallel to the plane of the surface of the magnetic medium, wherein the overall angle is between about 25° and about 45°, an insulator layer positioned between each bundle of carbon nanotubes and the main pole; electro-conductive connectors positioned on each longitudinal end of each bundle of carbon nanotubes; a trailing shield positioned on a trailing side of the main pole; a leading shield positioned on a leading side of the main pole; and side shields positioned on either side of the main pole in the cross-track direction, wherein a portion of the magnetic writing field emanates from edges of the main pole and is applied at an angle to perpendicular to the plane of the surface of the magnetic medium, wherein the angle to perpendicular is between about 10° and about 90°.