# US 2014/0272471 A1 · Non-magnetic seed layer method and apparatus > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2014/0272471 A1 - Document ID: US20140272471A1 - Status: Published application - Kind: A1 - Application number: 13/797,165 - Filed: 2013-03-12 - Published: 2014-09-18 - Earliest claimed: 2013-03-12 - Assignees: Seagate Technology LLC - Applicants: Seagate Technology LLC - Inventors: Wei Tian; Venkateswara Rao Inturi; Doug Lin; Huaqing Yin; Jiaoming Qiu - Web page: https://patentgrep.com/patent/US20140272471A1 ## CPC - G11B 5/235: Selection of material for gap filler {(G11B5/232 takes precedence)} - 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 5/23: Gap features {(G11B5/1871, G11B5/1875, G11B5/265, G11B5/29, G11B5/488 and subgroups, G11B5/4907 and subgroups, G11B5/4969 and subgroups take precedence)} - G11B 5/232: {Manufacture of gap} - G11B 5/3143: {including additional layers for improving the electromagnetic transducing properties of the basic structure, e.g. for flux coupling, guiding or shielding (G11B5/3116, G11B5/312 take precedence)} - G11B 5/3163: {Fabrication methods or processes specially adapted for a particular head structure, e.g. using base layers for electroplating, using functional layers for masking, using energy or particle beams for shaping the structure or modifying the properties of the basic layers} - G11B 5/332: {using thin films (G11B5/372, G11B5/3903 take precedence)} - G11B 5/6082: {Design of the air bearing surface} - 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)} - Y10T 428/115: Magnetic layer composition - Y10T 428/1193: with interlaminar component [e.g., adhesion layer, etc.] - 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) - Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION ## Abstract In accordance with one embodiment, an apparatus can be configured that includes a main pole layer of magnetic material; a second layer of magnetic material; a first gap layer of non-magnetic material disposed between the main pole layer and the second layer of magnetic material; a second gap layer of non-magnetic material disposed between the main pole layer and the second layer of magnetic material; and wherein the second gap layer of non-magnetic material is disposed directly adjacent to the second layer of magnetic material. In accordance with one embodiment, this allows the gap to serve as a non-magnetic seed for the second layer of magnetic material. In accordance with one embodiment, this allows the gap to serve as a non-magnetic seed for the second layer of magnetic material. In accordance with one embodiment, a method of manufacturing such a device may also be utilized. ## Claims ### Claim 1 1) An apparatus comprising: a main pole layer of magnetic material; a second layer of magnetic material; a first gap layer of non-magnetic material disposed between the main pole layer and the second layer of magnetic material; a second gap layer of non-magnetic material disposed between the main pole layer and the second layer of magnetic material; wherein the second gap layer of non-magnetic material is disposed directly adjacent to the second layer of magnetic material. ### Claim 2 (depends on 1) 2) The apparatus as claimed in claim 1 wherein the second gap layer of non-magnetic material comprises Ruthenium. ### Claim 3 (depends on 1) 3) The apparatus as claimed in claim 1 wherein the first layer of non-magnetic material comprises Al2O3 and the second gap layer of non-magnetic material comprises Ruthenium. ### Claim 4 (depends on 1) 4) The apparatus as claimed in claim 1 wherein the magnetic moment on a first side of a write gap and a magnetic moment on a second side of the write gap are substantially equivalent. ### Claim 5 (depends on 1) 5) The apparatus as claimed in claim 1 wherein the second layer of magnetic material forms a front shield. ### Claim 6 (depends on 1) 6) The apparatus as claimed in claim 1 wherein the first gap layer of non-magnetic material comprises Ruthenium. ### Claim 7 (depends on 1) 7) The apparatus as claimed in claim 1 wherein the first gap layer of non-magnetic material is disposed adjacent to the main pole layer of magnetic material; and wherein the second gap layer of non-magnetic material is disposed on top of the first layer of non-magnetic material; the apparatus further comprising: a third gap layer of non-magnetic material disposed directly between the second gap layer of non-magnetic material and the second layer of magnetic material. ### Claim 8 (depends on 1) 8) The apparatus as claimed in claim 1 wherein the first gap layer of non-magnetic material comprises Ruthenium disposed directly adjacent to the main pole layer of magnetic material; and wherein the second gap layer of non-magnetic material comprises Ruthenium disposed directly adjacent the second layer of magnetic material; the apparatus further comprising: a layer of Al2O3 disposed directly between the first gap layer of non-magnetic material and the second gap layer of non-magnetic material. ### Claim 9 (depends on 1) 9) The apparatus as claimed in claim 1 wherein the second gap layer of non-magnetic material serves as a seed layer for the second layer of magnetic material. ### Claim 10 (depends on 1) 10) The apparatus as claimed in claim 1 wherein the second layer of magnetic material comprises FeCo. ### Claim 11 11) A method comprising: depositing a main pole layer of magnetic material; depositing a first gap layer of non-magnetic material; depositing a second gap layer of non-magnetic material; depositing a second layer of magnetic material directly adjacent to the second gap layer of non-magnetic material so that the second gap layer of non-magnetic material is disposed between the main pole layer of magnetic material and the second layer of magnetic material. ### Claim 12 (depends on 11) 12) The method as claimed in claim 11 wherein the second gap layer of non-magnetic material comprises Ruthenium. ### Claim 13 (depends on 11) 13) The method as claimed in claim 11 wherein the first gap layer of non-magnetic material comprises a layer of Al2O3 and wherein the second gap layer of non-magnetic material comprises Ruthenium. ### Claim 14 (depends on 11) 14) The method as claimed in claim 11 and further comprising: forming a first magnetic moment on a first side of a write gap and a second magnetic moment on a second side of the write gap wherein the first magnetic moment and the second magnetic moment are substantially equivalent. ### Claim 15 (depends on 11) 15) The method as claimed in claim 11 and further comprising: forming a front shield from the second layer of magnetic material. ### Claim 16 (depends on 11) 16) The method as claimed in claim 11 wherein the first gap layer of non-magnetic material comprises Ruthenium. ### Claim 17 (depends on 11) 17) The method as claimed in claim 11 wherein the first gap layer of non-magnetic material is disposed adjacent to the main pole layer of magnetic material; wherein the second gap layer of non-magnetic material is disposed adjacent to the first gap layer of non-magnetic material; the method further comprising: depositing a third gap layer of non-magnetic material disposed directly between the second gap layer of non-magnetic material and the second layer of magnetic material. ### Claim 18 (depends on 11) 18) The method as claimed in claim 11 wherein depositing a first gap layer of non-magnetic material comprises depositing a first gap layer of Ruthenium disposed adjacent to the main pole layer of magnetic material; wherein depositing a second gap layer of non-magnetic material comprises depositing a layer of Al2O3 disposed on top of the first layer of Ruthenium; the method further comprising: depositing a second layer of Ruthenium disposed directly between the layer of Al2O3 and the second layer of magnetic material. ### Claim 19 (depends on 11) 19) The method as claimed in claim 11 and further comprising: utilizing the second gap layer of non-magnetic material as a seed layer for the second layer of magnetic material. ### Claim 20 (depends on 11) 20) The method as claimed in claim 11 and further comprising: utilizing FeCo as the second layer of magnetic material.