Combined With Inductive Write Head In Piggyback/merged Configuration Patents (Class 360/317)
  • Patent number: 10872625
    Abstract: The present disclosure generally relates to a magnetic media drive employing a magnetic recording head. The magnetic recording head comprises a first write head disposed adjacent to a second write head. The first write head comprises a first main pole coupled to a first yoke having a first length. The second write head comprises a second main pole coupled to a second yoke having a second length that is less than the first length of the first yoke. A first coil is wrapped around the first yoke, and a second coil is wrapped around the second yoke. The first coil is wrapped around the first yoke a greater number of times than the second coil is wrapped around the second yoke. Both the first and second coils comprise first portions comprised of a first material and second portions comprised of a second material different than the first material.
    Type: Grant
    Filed: November 21, 2019
    Date of Patent: December 22, 2020
    Assignee: WESTERN DIGITAL TECHNOLOGIES, INC.
    Inventors: Thao A. Nguyen, Michael Kuok San Ho, Zhigang Bai, Zhanjie Li, Quang Le
  • Patent number: 10164471
    Abstract: Provided is a transmission device for a wireless charger. A transmission device for a wireless charger in accordance with exemplary embodiments of the present invention comprises: a plurality of planar coils which transmit a wireless power signal for wireless charging and which are arranged so as to be at least partially overlapped with each other; a shielding sheet which has an attachment surface to which a part or all of the planar coils are fixed by the medium of an adhesive layer, and which shields a magnetic field generated from the planar coils; and a height deviation compensation means which is provided on the attachment surface and which compensates for individual height deviation between each planar coil and the attachment surface.
    Type: Grant
    Filed: November 6, 2015
    Date of Patent: December 25, 2018
    Assignee: AMOSENSE CO., LTD
    Inventors: Kil Jae Jang, Dong Hoon Lee, Min Sik Jang, Ki Chul Kim, Jong Ho Park
  • Patent number: 9899042
    Abstract: A data storage device data writer may arrange a write pole to be positioned uptrack from a front shield on an air bearing surface. The front shield can consist of a lamination of a first magnetic alloy material and a second magnetic alloy material. The second magnetic alloy material may be NiFe that has 80% iron by weight.
    Type: Grant
    Filed: February 8, 2016
    Date of Patent: February 20, 2018
    Assignee: Seagate Technology LLC
    Inventors: Vijayaharan A. Venugopal, Muhammad Asif Bashir, Peter McGeehin, Marcus B. Mooney, Mark Gubbins
  • Patent number: 9484048
    Abstract: According to one embodiment, a magnetic head includes a write element, a read element, and a heating element disposed between the write element and the read element. When power is applied to the heating element, either the read element or the write element projects beyond a plane of an air-bearing surface (ABS) of the magnetic head, and when power is not applied to the heating element, a portion of the ABS of the magnetic head facing a magnetic disk close to the heating element has a concave shape. In another embodiment, when power is applied to the heating element, at least one of a portion of the read element and a portion of the write element approaches a magnetic disk, and when power is not applied to the heating element, a portion of the ABS of the magnetic head facing a magnetic disk close to the heating element has a concave shape.
    Type: Grant
    Filed: November 20, 2009
    Date of Patent: November 1, 2016
    Assignee: HGST Netherlands B.V.
    Inventors: Shinji Sasaki, Takateru Seki, Masayuki Kurita, Toshiya Shiramatsu
  • Patent number: 9437146
    Abstract: Disclosed are a shift register, a gate driver and a display device, which relate the field of display technology and may eliminate the voltage coupled noise generated by a clock signal at an output terminal of the shift register effectively. The shift register comprises: a first input unit, a clock control unit, a second input unit, an inverting unit, a pulling-down unit and a first level selecting unit, a second level selecting unit, a third level selecting unit; the first input unit is connected with a first input signal terminal, the first level selecting unit and the second input unit, respectively, wherein a node at which the first input unit is connected with the second input unit is a pulling-up node, the first input unit is used for controlling a potential at the pulling-up node. The embodiments of the present disclosure may be applied to various display devices.
    Type: Grant
    Filed: August 31, 2015
    Date of Patent: September 6, 2016
    Assignees: BOE TECHNOLOGY GROUP CO., LTD., HEFEI BOE OPTOELECTRONICS TECHNOLOGY CO., LTD.
    Inventors: Xiaofang Gu, Rui Ma, Ming Hu
  • Patent number: 9336799
    Abstract: A perpendicular magnetic recording (PMR) head is fabricated with main pole and a trailing edge shield antiferromagnetically coupled across a write gap by either having the write gap layer formed as a synthetic antiferromagnetic tri-layer (SAF) or formed as a monolithic layer of antiferromagnetic material. The coupling improves the write performance of the writer by enhancing the perpendicular component of the write field and its gradient. Methods of fabricating the writer are provided.
    Type: Grant
    Filed: October 8, 2013
    Date of Patent: May 10, 2016
    Assignee: Headway Technologies, Inc.
    Inventors: Tai Min, Yuhui Tang, Lijie Guan, Min Li
  • Patent number: 9324341
    Abstract: A magnetic head includes a main pole, an expansion member, and a heater. The main pole has an end face located in a medium facing surface. The expansion member is located farther from the medium facing surface than is the main pole and adjacent to the main pole in a direction perpendicular to the medium facing surface. The heater heats the expansion member. The expansion member has a linear expansion coefficient higher than that of the main pole.
    Type: Grant
    Filed: November 18, 2013
    Date of Patent: April 26, 2016
    Assignees: HEADWAY TECHNOLOGIES, INC., SAE MAGNETICS (H.K.) LTD.
    Inventors: Yoshitaka Sasaki, Hiroyuki Ito, Shigeki Tanemura, Kazuki Sato, Tatsuya Shimizu
  • Patent number: 9251828
    Abstract: In a method for operating a tape storage system, while a tape is being moved in a tape drive across a tape head for one or more of reading and writing user data from/to a data track of the tape, a read element of the tape head, which read element is assigned to the data track, is moved transverse to a moving direction of the tape for a distance of more than a width of the data track. A transverse position of one or more of the following elements is subject to a signal supplied by the read element during its transverse move: The read element; another read element assigned to the data track; and a write element assigned to the data track.
    Type: Grant
    Filed: July 4, 2012
    Date of Patent: February 2, 2016
    Assignee: International Business Machines Corporation
    Inventors: Giovanni Cherubini, Jens Jelitto, Mark A. Lantz
  • Patent number: 9236565
    Abstract: Embodiments of the invention provide a method for fabricating a magnetoresistive device. The method comprises: releasing a multi-layer magnetoresistive structure for forming the magnetoresistive device from a first substrate to relax an intrinsic stress in the multi-layer magnetoresistive structure such that the magnetic and/or magnetoresistive properties of the magnetoresistive device can be improved. The magnetic and/or magnetoresistive properties include, but are not limited to coercivity, squareness or abruptness of switching, magnetoresistance (MR) and resistance of the magnetoresistive device.
    Type: Grant
    Filed: April 28, 2015
    Date of Patent: January 12, 2016
    Assignees: National University of Singapore, Yonsei University
    Inventors: Li Ming Loong, Hyunsoo Yang, Wonho Lee, Jong-Hyun Ahn, Charanjit Singh Bhatia
  • Patent number: 9183851
    Abstract: A set of lateral positions, of the magnetic medium with respect to the tape reel and a set of longitudinal positions of the magnetic medium with respect to the beginning of the magnetic medium as the magnetic medium comes off the first tape reel, are identified. A record is stored, on a non-volatile storage medium, of the set of lateral positions of the magnetic medium and the set of longitudinal positions of the magnetic medium. The record, of the set of lateral positions of the magnetic medium and the set of longitudinal positions of the magnetic medium as the magnetic medium comes off a second tape reel, is read. A tape head is moved laterally, to the lateral positions in response to the reading of the record of the set of lateral positions of the magnetic medium and the set of longitudinal positions of the magnetic medium.
    Type: Grant
    Filed: October 9, 2013
    Date of Patent: November 10, 2015
    Assignee: GLOBALGOUNDRIES U.S. 2 LLC
    Inventors: Allen K. Bates, Nhan X. Bui, Daniel J. Winarski
  • Patent number: 9171556
    Abstract: A magnetic head includes a medium facing surface, a read head unit, a write head unit, and a protrusion device. The protrusion device causes part of the medium facing surface to protrude toward a recording medium. The read head unit has a first end face located in the medium facing surface and includes a first contact sensor for detecting contact of the first end face with the recording medium. The write head unit has a second end face located in the medium facing surface and includes a second contact sensor for detecting contact of the second end face with the recording medium. The first end face and the second end face are located at positions different from each other in a direction of travel of the recording medium.
    Type: Grant
    Filed: February 18, 2014
    Date of Patent: October 27, 2015
    Assignees: HEADWAY TECHNOLOGIES, INC., SAE MAGNETICS (H.K.) LTD.
    Inventors: Yoshitaka Sasaki, Hiroyuki Ito, Shigeki Tanemura, Kazuki Sato, Tatsuya Shimizu
  • Patent number: 9123372
    Abstract: A transducer is configured to interact with a magnetic storage medium, a first channel comprises a first sensor and first circuitry configured to adjust a plurality of first channel parameters, and a second channel comprises a second sensor and second circuitry configured to adjust a plurality of second channel parameters. The first and second channel parameters are independently adjustable by the first and second circuitry, respectively. A detector is coupled to the first and second channels, and configured to detect a head-medium interface event.
    Type: Grant
    Filed: August 12, 2014
    Date of Patent: September 1, 2015
    Assignee: SEAGATE TECHNOLOGY LLC
    Inventors: Housan Dakroub, Edward Charles Gage, Tim Rausch
  • Patent number: 9058823
    Abstract: A transducer includes magnetic material formed on a substrate that is shaped to include a trailing edge, a leading edge and a pair of opposing sidewalls extending between the trailing edge and the leading edge. A layer of protective material is positioned in contact with each of the pair of sidewalls of the shaped magnetic material. Backfill material surrounds the protective material on each of the pair of sidewalls of the shaped magnetic material.
    Type: Grant
    Filed: July 13, 2009
    Date of Patent: June 16, 2015
    Assignee: Seagate Technology LLC
    Inventors: Alexey V. Nazarov, Vladyslav Alexandrovich Vasko, Olle Gunnar Heinonen, Lijuan Zou, Thomas R. Boonstra, Xilin Peng, Kaizhong Gao
  • Patent number: 9053715
    Abstract: A method and system for providing a magnetic recording head is described. The magnetic recording head has an air-bearing surface (ABS) configured to reside in proximity to a media during use. The magnetic recording head includes a main pole, at least one auxiliary pole, a nonmagnetic spacer, and at least one coil. The main pole includes a first main pole piece and a second main pole piece. The first main pole piece includes a pole tip occupying a portion of the ABS and a back edge distal from the ABS. The second main pole piece has a front surface. The auxiliary pole(s) have a front recessed from the ABS and are magnetically coupled with the main pole. The nonmagnetic spacer is between the back edge of the first main pole piece and the front surface of the second main pole piece. The coil(s) are for energizing the main pole.
    Type: Grant
    Filed: March 29, 2011
    Date of Patent: June 9, 2015
    Assignee: Western Digital (Fremont), LLC.
    Inventors: Lisha Wang, Tao Pan, Sining Mao, Zhigang Bai, Feng Liu, Zhanjie Li
  • Patent number: 9047885
    Abstract: Embodiments of the present invention provide a perpendicular magnetic recording head which can suppress reduction in recording field and efficiently reduce a fringe field. According to one embodiment, a side shield disposed at a side of each side face in a cross track direction of a main pole is arranged at a far leading side compared with the main pole.
    Type: Grant
    Filed: November 21, 2008
    Date of Patent: June 2, 2015
    Assignee: HGST Netherlands B.V.
    Inventors: Mikito Sugiyama, Isao Nunokawa, Hiroyuki Hoshiya
  • Patent number: 9015927
    Abstract: A method for fabricating a synthetic antiferromagnetic device, includes depositing a reference layer on a first tantalum layer and including depositing a first cobalt iron boron layer, depositing a second cobalt iron boron layer on the first cobalt iron boron layer, depositing a second Ta layer on the second cobalt iron boron layer, depositing a magnesium oxide spacer layer on the reference layer and depositing a cap layer on the magnesium oxide spacer layer.
    Type: Grant
    Filed: August 3, 2012
    Date of Patent: April 28, 2015
    Assignee: International Business Machines Corporation
    Inventors: David W. Abraham, Michael C. Gaidis
  • Patent number: 9001463
    Abstract: A magnetic head according to one embodiment includes a module, the module having both read and write transducers positioned towards a media facing side of the module, wherein the read and write transducers are selected from a group consisting of piggyback read-write transducers, merged read-write transducers, interleaved read and write transducers, and an array of write transducers flanked by servo read transducers; wherein the write transducers include write poles having media facing sides with negative, zero or near-zero recession from a plane extending along the media facing side of a substrate of the module; wherein the read transducers each have at least one shield, wherein a media facing side of the at least one shield is more recessed from the plane than the write poles.
    Type: Grant
    Filed: August 31, 2012
    Date of Patent: April 7, 2015
    Assignee: International Business Machines Corporaton
    Inventors: Robert G. Biskeborn, Jason Liang, Calvin S. Lo, Andrew C. Ting
  • Patent number: 8984740
    Abstract: A method for providing a magnetic recording transducer is provided. The method includes providing a substrate, and a magnetic shield having a top surface above the substrate. The top surface is treated by a first plasma treatment performed at a first power. An amorphous ferromagnetic (FM) layer is deposited on and in contact with the top surface to a thickness of at least 5 Angstroms and not more than 50 Angstroms. A second plasma treatment is performed at a second power. A magnetic seed layer is provided on and contact with the amorphous FM layer. The magnetic seed layer may comprise a bilayer. A nonmagnetic spacer layer is provided above the magnetic seed layer, an antiferromagnetic (AFM) layer provided above the spacer layer, and a read sensor provided above the AFM layer.
    Type: Grant
    Filed: November 30, 2012
    Date of Patent: March 24, 2015
    Assignee: Western Digital (Fremont), LLC
    Inventors: Yuankai Zheng, Qunwen Leng, Cheng-Han Yang, Zhitao Diao
  • Patent number: 8914969
    Abstract: A method fabricates a magnetic transducer. A sacrificial leading shield is provided on an etch stop layer. A nonmagnetic layer is provided on the sacrificial leading shield. A pole trench is formed in the nonmagnetic layer and on the sacrificial leading shield. A pole is formed. The pole has a bottom and a top wider than the bottom in a pole tip region. Part of the pole in the pole tip region is in the pole trench and at the ABS location. The sacrificial leading shield and part of the nonmagnetic layer adjacent to the pole are removed. An air bridge thus resides in place of the sacrificial leading shield between the portion of the pole and the etch stop layer. As least one shield layer is provided. The at least one shield layer substantially fills the air bridge and form a monolithic shield including a leading and side shields.
    Type: Grant
    Filed: December 17, 2012
    Date of Patent: December 23, 2014
    Assignee: Western Digital (Fremont), LLC
    Inventors: Xiaotian Zhou, Hongzhou Jiang, Donghong Li, Lien-Chang Wang, Ching-Huang Lu, Wencheng Su, Lieping Zhong, Tao Pan
  • Patent number: 8893376
    Abstract: A method of forming a magnetic recording head is provided. The method comprises the steps of forming a damascene trench comprising a lower region having a substantially trapezoidal cross-section and an upper region having a substantially rectangular cross-section, and providing a magnetic material within the damascene trench.
    Type: Grant
    Filed: August 7, 2012
    Date of Patent: November 25, 2014
    Assignee: Western Digital(Fremont), LLC
    Inventors: Changqing Shi, Ming Jiang
  • Patent number: 8844120
    Abstract: A method for providing a magnetic transducer including an underlayer is provided. The method comprises providing a recessed region in the underlayer. The recessed region includes a front having an angle from horizontal. The angle is greater than zero and less than ninety degrees. The method further comprises providing an assist pole layer in the recessed region, providing a main pole layer, a portion of the main pole layer residing on the assist pole layer, and defining a main pole from the assist pole layer and the main pole layer.
    Type: Grant
    Filed: October 26, 2012
    Date of Patent: September 30, 2014
    Assignee: Western Digital (Fremont), LLC
    Inventors: Yong Shen, Zhigang Bai
  • Patent number: 8760807
    Abstract: A method fabricates a magnetic transducer having a nonmagnetic layer and an ABS location corresponding to an ABS. Etch stop and nonmagnetic etchable layers are provided. A side shield layer is provided between the ABS location and the etch stop and etchable layers. A pole trench is formed in the side shield and etchable layers. The pole trench has a pole tip region in the side shield layer and a yoke region in the etchable layer. A nonmagnetic side gap layer, at least part of which is in the pole trench, is provided. A remaining portion of the pole trench has a location and profile for a pole and in which at least part of the pole is formed. A write gap and trailing shield are provided. At least part of the write gap is on the pole. At least part of the trailing shield is on the write gap.
    Type: Grant
    Filed: September 28, 2012
    Date of Patent: June 24, 2014
    Assignee: Western Digital (Fremont), LLC
    Inventors: Jinqiu Zhang, Ying Hong, Feng Liu, Zhigang Bai
  • Patent number: 8720044
    Abstract: A method for manufacturing a magnetic transducer is described. The method includes providing a negative mask having a bottom, a plurality of sides, and a top wider than the bottom. The method also includes depositing a nonmagnetic layer on the negative mask. The nonmagnetic layer has a plurality of portions covering the plurality of sides of the negative mask. The method also includes providing a first mask having a first trench therein. The negative mask resides in the first trench. The method further includes depositing side shield material(s), at least a portion of which resides in the first trench. The method further includes removing the negative mask to create a second trench between the plurality of portions of the nonmagnetic layer and form a pole, at least a portion of which resides in the second trench.
    Type: Grant
    Filed: February 27, 2013
    Date of Patent: May 13, 2014
    Assignee: Western Digital (Fremont), LLC
    Inventors: Ut Tran, Zhigang Bai, Kevin K. Lin, Li He
  • Patent number: 8701274
    Abstract: A manner for stabilizing the shield domain structure is described that employs the magnetic field of a hard bias layer. More particularly, it has been found that the shield domain structure is stabilized when the height of the hard bias layer in the depth direction is made substantially half the height of upper shield layer. In another embodiment of the invention, a stabilizing structure is provided at approximately the midpoint of the shield in order to fix the closure domain of the shield to the desired two-domain structure. In an embodiment of the invention, the stabilizing structure is made convex or concave as viewed from the air-bearing surface.
    Type: Grant
    Filed: December 30, 2011
    Date of Patent: April 22, 2014
    Assignee: HGST Netherlands B.V.
    Inventors: Koji Kataoka, Takashi Wagatsuma
  • Patent number: 8685757
    Abstract: A method for fabricating a magnetic tunnel junction element includes forming a magneto resistance layer including a first magnetic layer, an insulation layer and a second magnetic layer on a substrate, forming a magnetic loss area by doping a magnetic loss impurity into a region of the magneto resistance layer to cause a magnetic loss, and etching the magnetic loss area to form a magnetic tunnel junction element.
    Type: Grant
    Filed: December 20, 2011
    Date of Patent: April 1, 2014
    Assignee: SK Hynix Inc.
    Inventors: Dong Ha Jung, Gyu An Jin, Su Ryun Min
  • Patent number: 8646168
    Abstract: A method for manufacturing a magnetic write pole of a magnetic write head for perpendicular magnetic recording. A magnetic write pole material is deposited, followed by union milling hard mask, a polymer mask under-layer followed by a dielectric hard mask material, followed by a photoresist. The photoresist is patterned to define a write pole shape and the shape of the patterned photoresist is transferred onto the underlying dielectric hard mask by a novel reactive ion etching that is performed in a chemistry that includes one or more fluorine containing gases and He. The presence of He in the reactive ion etching tool helps to improve the profile of the patterned dielectric hard mask. In addition, RIE parameters such a gas ratio (e.g. CF4 to CHF3 gas ratio) and power ratio (e.g. source power to bias power) are adjusted to optimize the profile of the patterned dielectric mask.
    Type: Grant
    Filed: September 30, 2011
    Date of Patent: February 11, 2014
    Assignee: HGST Netherlands B.V.
    Inventors: Guomin Mao, Sue Siyang Zhang, Yi Zheng
  • Patent number: 8634167
    Abstract: A magnetic head for data recording having a pair of heating elements that self regulate in response to temperature to distribute heat for thermal actuation. The head includes a first heating element located adjacent to the read sensor and away from the writer, and a second heating element located adjacent to the writer. The first and second heating elements have different coefficients of thermal resistance that cause the heating of the second heating element to increase relative to that of the first heating element when the overall temperature increases or when power provided by a power source increases. There, thereby prevents the read sensor from extending too much and possibly contacting the disk.
    Type: Grant
    Filed: May 27, 2011
    Date of Patent: January 21, 2014
    Assignee: HGST Netherlands B.V.
    Inventors: Wen-Chien D. Hsiao, Xinjiang Shen
  • Patent number: 8631561
    Abstract: The present invention generally relates to fabricating a bond pad for electrically connecting a laser diode to a slider and a TAR head in a HDD. The bond pad is deposited on a surface of the head that is perpendicular to the air bearing surface (ABS). The head is diced and lapped to expose the bond pad on a top surface of the head and mounted on a slider. The laser diode and a sub-mount may be coupled to the top surface of the slider—i.e., the surface opposite the ABS—by connecting to the bond pads. Specifically, both the laser diode and the sub-mount have electrodes thereon that are perpendicular to the bond pads. Conductive bonding material is used to bond the laser diode and the sub-mount to the bond pads.
    Type: Grant
    Filed: November 30, 2011
    Date of Patent: January 21, 2014
    Assignee: HGST Netherlands B.V.
    Inventors: Christian René Bonhôte, Linden James Crawforth, Toshiki Hirano, Fu-Ying Huang, Neil Leslie Robertson, Barry Cushing Stipe
  • Patent number: 8629519
    Abstract: A tunneling magnetoresistance sensor including a substrate, an insulating layer, a tunneling magnetoresistance component and an electrode array is provided. The insulating layer is disposed on the substrate. The tunneling magnetoresistance component is embedded in the insulating layer. The electrode array is formed in a single metal layer and disposed in the insulating layer either below or above the TMR component. The electrode array includes a number of separate electrodes. The electrodes are electrically connected to the tunneling magnetoresistance component to form a current-in-plane tunneling conduction mode. The tunneling magnetoresistance sensor in this configuration can be manufactured with a reduced cost and maintain the high performance at the same time.
    Type: Grant
    Filed: December 21, 2011
    Date of Patent: January 14, 2014
    Assignee: Voltafield Technology Corporation
    Inventors: Chien-Min Lee, Kuang-Ching Chen, Fu-Tai Liou
  • Publication number: 20130342937
    Abstract: A magnetic write head having a main magnetic write pole and a magnetic sub-pole that are configured to maximize magnetic performance. The main magnetic write pole has a flared portion located near the air bearing surface and a non-flared portion removed from the air bearing surface. A magnetic sub-pole is formed adjacent to the main magnetic write pole and terminates at a front endpoint that is recessed from the air bearing surface but is closer to the air bearing surface than the non-flared portion.
    Type: Application
    Filed: June 21, 2012
    Publication date: December 26, 2013
    Applicant: HITACHI GLOBAL STORAGE TECHNOLOGIES NETHERLANDS B.V.
    Inventors: Mikito Sugiyama, Kazuhiko Hosomi, Kaori Suzuki
  • Patent number: 8607442
    Abstract: A disk drive device includes a hub, a base plate, and a bearing unit. The bearing unit includes a shaft housing member, joined to the hub, having a through-hole in the center, a shaft having a smaller diameter section and a larger diameter section, a radial dynamic pressure grooves, and a lubricant agent. The opening shape of bearing hole of the base plate is so formed as to be larger than the outer shape of the larger diameter section. In the bearing unit, the larger diameter section of the bearing unit is fixed by a hardening resin present between the bearing unit and the bearing hole.
    Type: Grant
    Filed: October 7, 2011
    Date of Patent: December 17, 2013
    Assignee: Samsung Electro-Mechanics Japan Advanced Technology Co., Ltd.
    Inventors: Mitsuo Kodama, Ryusuke Sugiki, Akira Aoi
  • Patent number: 8607439
    Abstract: A method and system for providing an energy assisted magnetic recording (EAMR) head are described. The method and system include providing a slider, an EAMR transducer coupled with the slider, and a top layer on the slider. The top layer includes a mirror well therein and has a substantially flat top surface. The method and system further includes providing a laser including a light-emitting surface and providing a mirror optically coupled with the laser. The laser is coupled to the top surface of the top layer external to the mirror well. The mirror has a bottom surface and a reflective surface facing the light-emitting surface of the laser. A portion of the bottom surface of the mirror is affixed to the top surface of the top layer. A portion of the mirror resides in the mirror well.
    Type: Grant
    Filed: March 31, 2010
    Date of Patent: December 17, 2013
    Assignee: Western Digital (Fremont), LLC
    Inventors: Lei Wang, Dujiang Wan
  • Patent number: 8567045
    Abstract: As track densities increase, it becomes increasingly important, while writing in a given track, not to inadvertently write data in adjoining tracks. This problem has been overcome by limiting the width of material in the ABS plane to what it is at the write gap. The part of the lower pole that is wider than this is recessed back away from the ABS, thereby greatly reducing its magnetic influence on adjacent tracks. Four different embodiments of write heads that incorporate this notion are described together with a description of a general process for their manufacture.
    Type: Grant
    Filed: February 6, 2012
    Date of Patent: October 29, 2013
    Assignee: Headway Technologies, Inc.
    Inventors: Moris Dovek, Glen Garfunkel, Po Kang Wang
  • Patent number: 8564910
    Abstract: An apparatus and associated method for a magnetic shield structure for data transduction from a recordable media in a data storage device. Various embodiments of the present invention are generally directed to a data transducer and a magnetic shield structure comprising a write shield magnetic material constructed of exchange decoupled material.
    Type: Grant
    Filed: November 12, 2009
    Date of Patent: October 22, 2013
    Assignee: Seagate Technology LLC
    Inventors: Mourad Benakli, Kirill Rivkin, Kaizhong Gao, James Wessel, Ming Sun, Ibro Tabakovic, Mark Thomas Kief
  • Patent number: 8547665
    Abstract: In one embodiment, a magnetic head includes a substrate having a media support surface; a gap coupled to the substrate, the gap having at least one of a magnetoresistive (MR) sensor and a writer; a closure coupled to the gap on a side thereof opposite the substrate, said closure forming a portion of the media support surface; and a material formed in one or more recesses extending into the media support surface of at least one of the substrate and the closure.
    Type: Grant
    Filed: January 3, 2008
    Date of Patent: October 1, 2013
    Assignee: International Business Machines Corporation
    Inventors: Robert Glenn Biskeborn, Calvin Shyhjong Lo, Gary Miles McClelland
  • Patent number: 8533937
    Abstract: A method or forming a wrapped-around shielded perpendicular magnetic recording writer pole is disclosed. A structure comprising a leading shield layer and an intermediate layer disposed over the leading shield layer is provided, the intermediate layer comprising a pole material and a dielectric material. A trench is formed in the dielectric material. A non-magnetic layer in the trench is removed via an ion beam etching process. A seed layer is deposited in the trench and over the pole material. A magnetic material comprising a side shield layer is deposited on at least a portion of the seed layer.
    Type: Grant
    Filed: October 18, 2011
    Date of Patent: September 17, 2013
    Assignee: Western Digital (Fremont), LLC
    Inventors: Jinwen Wang, Weimin Si, Jianxin Fang, Ying Hong, Hongzhou Jiang, Ching-Huang Lu, Yan Chen, Donghong Li, Lien-Chang Wang, Lieping Zhong, Tao Pan
  • Patent number: 8533934
    Abstract: A method of assembling a hard disk drive comprises steps of: sealing an interface of the base and the cover of an enclosed housing with an infrared-transmissive tape; filling the enclosed housing with a desired gaseous medium; optionally, testing the hard disk drive; and, optionally; re-working the hard disk drive. Preferably, the enclosed housing is free of rubber gasket materials between the base and the cover. A hermetically sealed hard disk drive of the invention comprises: a housing comprising a base and a cover; and disk drive components enclosed within the housing for facilitating reading and recording of data at any desired location on at least one disk contained within the housing, wherein the hard disk drive is free of rubber gasket materials between the base and the cover.
    Type: Grant
    Filed: April 28, 2011
    Date of Patent: September 17, 2013
    Assignee: entrotech, inc.
    Inventors: James E. McGuire, Jr., Andrew C. Strange
  • Patent number: 8499435
    Abstract: A thin-film magnetic head is constructed such that a main magnetic pole layer, a lower shield layer, an upper shield layer and a thin-film coil are laminated on a substrate. A method of manufacturing the thin-film magnetic head has a lower shield layer forming step. This step comprises a step of forming a first lower shield part in a lower shield planned area, including a planned line along the medium-opposing surface, a step of forming a partial lower seed layer having a partial arrangement structure in which the partial lower seed layer is arranged on a lower formation zone except a lower exception zone including the planned line, a step of forming a second lower shield part on the partial lower seed layer.
    Type: Grant
    Filed: October 24, 2011
    Date of Patent: August 6, 2013
    Assignees: Headway Technologies, Inc., SAE Magnetics (H.K.) Ltd.
    Inventors: Yoshitaka Sasaki, Hiroyuki Ito, Shigeki Tanemura, Kazuki Sato, Atsushi Iijima
  • Patent number: 8474127
    Abstract: A method for enhancing thermal stability, improving biasing and reducing damage from electrical surges in self-pinned abutted junction heads. The method includes forming a free layer, forming first hard bias layers abutting the free layer and forming second hard bias layers over the first hard bias layers discontiguous from the free layer, the second hard bias layers being anti-parallel to the first hard bias layers, the first and second hard bias layers providing a net longitudinal bias on the free layer.
    Type: Grant
    Filed: July 27, 2006
    Date of Patent: July 2, 2013
    Assignee: HGST Netherlands B.V.
    Inventors: Hardayal Singh Gill, Wen-Chien Hsiao, Jih-Shiuan Luo
  • Patent number: 8468683
    Abstract: Methods of making write poles for perpendicular magnetic recording write heads. The bevel angle of the write pole for a perpendicular magnetic recording write head affects the performance of the write head. By forming reinforcement layer on the polymeric underlayer mask to enhance the mask durability during ion mill and tapering the polymeric underlayer above the non-magnetic mill mask layer using oxygen and nitrogen based reactive ion etch process, the bevel angle of the magnetic write pole can be increased greatly to meet the demands of the next and future generations of magnetic recording write heads.
    Type: Grant
    Filed: October 31, 2011
    Date of Patent: June 25, 2013
    Assignee: HGST Netherlands B.V.
    Inventors: Guomin Mao, Yi Zheng
  • Patent number: 8468682
    Abstract: A method for providing a perpendicular magnetic recording transducer is described. The method and system include providing a metallic underlayer and providing an insulator, at least a portion of which is on the metallic underlayer. The method and system also include forming a trench in the insulator. The bottom of the trench is narrower than the top of the trench and includes a portion of the metallic underlayer. The method and system also include providing a nonmagnetic seed layer that substantially covers at least the bottom and sides of the trench. The method and system also include plating a perpendicular magnetic pole material on at least a portion of the seed layer and removing a portion of the perpendicular magnetic pole material. A remaining portion of the perpendicular magnetic pole material forms a perpendicular magnetic recording pole.
    Type: Grant
    Filed: March 6, 2012
    Date of Patent: June 25, 2013
    Assignee: Western Digital (Fremont), LLC
    Inventor: Lei Larry Zhang
  • Patent number: 8453316
    Abstract: A method of forming a magnetic head comprises the steps of: selectively exposing through the use of a photomask a photoresist layer unpatterned; forming a pattern for forming a pole layer by developing the photoresist layer after the exposure; and forming the pole layer through the use of the pattern. The photomask includes first to third regions. The first region has such a perimeter that a projection image thereof is shaped along a perimeter of an ideal shape of the top surface of the pole layer. The second region touches the perimeter of the first region, and is located outside the first region. The third region is located inside the first region without touching the perimeter of the first region. The third region suppresses deviation of the pole layer from its desired shape which may be caused by the effect of light reflected while the photoresist layer is exposed.
    Type: Grant
    Filed: July 2, 2009
    Date of Patent: June 4, 2013
    Assignee: Headway Technologies, Inc.
    Inventors: Yoshitaka Sasaki, Kazuo Ishizaki, Hiroyuki Itoh
  • Patent number: 8453317
    Abstract: Methods of fabricating magnetic write heads and electrical lapping guides (ELG's) using a split gap deposition process is described. A removal process is performed on a magnetic material to define a main write pole and to define a corresponding ELG for the main write pole. A first non-magnetic gap layer is deposited. A mask and liftoff process is performed to deposit an electrically conductive material on the first gap layer disposed along a front edge of the ELG. A second non-magnetic gap layer is then deposited and a shield is fabricated for the write pole.
    Type: Grant
    Filed: October 14, 2010
    Date of Patent: June 4, 2013
    Assignee: HGST Netherlands, B.V.
    Inventors: Donald Allen, Jennifer Ai-Ming Leung, Aron Pentek, Thomas Roucoux
  • Patent number: 8443510
    Abstract: A method for providing at least one transducer including magnetic structure and having an air-bearing surface (ABS) are described. The method includes providing a lapping electronic lapping guide (lapping ELG) and a targeting ELG. The lapping ELG and targeting ELG each are coplanar with the desired thickness of the magnetic structure and have a back edge at the distance from the ABS such that the ELG back edges are substantially aligned with the flare point. The targeting ELG has a front edge at a front edge distance from the ABS corresponding to an intersection of the bevel and the desired thickness. The method further includes lapping the transducer and terminating the lapping based on a first resistance of the lapping ELG and a second resistance of the targeting ELG.
    Type: Grant
    Filed: May 28, 2009
    Date of Patent: May 21, 2013
    Assignee: Western Digital (Fremont), LLC
    Inventors: Changqing Shi, Ming Jiang, Lijie Guan
  • Patent number: 8444865
    Abstract: A method for encapsulating a magnetic recording head including coating at least a portion of a magnetic recording head containing a recording gap with a first layer of at least one coating material, including silicon nitride, the first layer of at least one coating material having a first removal rate, coating at least a portion of the magnetic recording head containing a recording gap and coated with the first layer of at least one coating material with a second layer of at least one coating material, including aluminum oxide, the second layer of at least one coating material having a second removal rate higher than the first removal rate, and removing at least a portion of the second layer of at least one coating material via a removal process, including chemical-mechanical polishing, lapping, or vacuum processing to at least partially planarize the surface of the recording gap.
    Type: Grant
    Filed: August 18, 2008
    Date of Patent: May 21, 2013
    Assignee: International Busines Machines Corporation
    Inventors: Robert G. Biskeborn, Calvin S. Lo, Gary M. Decad, Cherngye Hwang
  • Patent number: 8437102
    Abstract: Embodiments in accordance with the present invention provide a magnetic head having a narrow track width and excellent in productivity for the purpose of realizing a disk storage unit having a large capacity. In a magnetic head having a plurality of flairs on a main magnetic pole, a side shield is formed via a non-magnetic film on both sides of the flair disposed close to an air bearing surface in such a fashion as to be aligned with the flair.
    Type: Grant
    Filed: October 31, 2006
    Date of Patent: May 7, 2013
    Assignee: HGST Netherlands B.V.
    Inventors: Yoji Maruyama, Takayuki Iwakura, Ichiro Ohdake, Masafumi Mochizuku
  • Patent number: 8424192
    Abstract: A method and system for manufacturing a pole on a recording head is disclosed. The method and system include sputtering at least one ferromagnetic layer and fabricating a hard mask on the ferromagnetic layer. The method and system also include defining the pole and depositing a write gap on the pole. A portion of the pole is encapsulated in an insulator.
    Type: Grant
    Filed: August 8, 2005
    Date of Patent: April 23, 2013
    Assignee: Western Digital (Fremont), LLC
    Inventors: Danning Yang, Lei Wang, Yingjian Chen, Brant Nease, Kyusik Sin
  • Patent number: 8407882
    Abstract: According to one embodiment, a method for manufacturing a thin film magnetic head includes forming on a substrate magnetic head portions having a magnetoresistive element and resistance detection elements for measuring an amount of polishing; slicing the substrate to form at least one row bar; polishing the ABS of each row bar; forming rails on the polished ABS; and cutting each row bar to separate each magnetic head portion. The step of polishing the ABS includes measuring a resistance of each resistance detection element and a resistance of each magnetoresistive element; calculating an offset value between the resistance detection element and the magnetoresistive element; and calculating a final resistance of the resistance detection element by using the calculated offset value. When the resistance of the resistance detection element reaches the final resistance, polishing of the ABS of the row bar is terminated. Other methods are presented as well.
    Type: Grant
    Filed: September 14, 2009
    Date of Patent: April 2, 2013
    Assignee: HGST Netherlands B.V.
    Inventors: Takateru Seki, Zhou Wenjun, Kazuo Takeda, Takefumi Kubota
  • Patent number: 8393074
    Abstract: A method of manufacturing a thermally-assisted magnetic recording head includes: providing a light source unit including a laser diode; providing a slider having a thermally-assisted magnetic recording head section thereon, the thermally-assisted magnetic recording head section including a magnetic pole, an optical waveguide, and a plasmon generator, the magnetic pole and the optical waveguide both extending toward an air bearing surface, the plasmon generator being located between the magnetic pole and the optical waveguide; driving the laser diode to allow a light beam to be emitted therefrom, the light beam including both a TE polarization component and a TM polarization component; performing an alignment between the light source unit and the thermally-assisted magnetic recording head section, based on a light intensity distribution of the TE polarization component in the light beam which has been emitted from the laser diode and then passed through the optical waveguide; and bonding the light source unit
    Type: Grant
    Filed: October 6, 2011
    Date of Patent: March 12, 2013
    Assignees: TDK Corporation, Sae Magnetics (H.K) Ltd.
    Inventors: Seiichi Takayama, Koji Shimazawa, Shinji Hara, Yasuhiro Ito, Nobuyuki Mori, Ryo Hosoi, Kazuaki Takanuki, Youichi Ando, Chimoto Sugiyama
  • Patent number: 8381391
    Abstract: A method for providing a magnetic recording transducer is described. The method includes providing a pinned layer for a magnetic element. In one aspect, a portion of a tunneling barrier layer for the magnetic element is provided. The magnetic recording transducer annealed is after the portion of the tunneling barrier layer is provided. The annealing is at a temperature higher than room temperature. A remaining portion of the tunneling barrier layer is provided after the annealing. In another aspect, the magnetic transducer is transferred to a high vacuum annealing apparatus before annealing the magnetic transducer. In this aspect, the magnetic transducer may be annealed before any portion of the tunneling barrier is provided or after at least a portion of the tunneling barrier is provided. The annealing is performed in the high vacuum annealing apparatus. A free layer for the magnetic element is also provided.
    Type: Grant
    Filed: June 26, 2009
    Date of Patent: February 26, 2013
    Assignee: Western Digital (Fremont), LLC
    Inventors: Chando Park, Qunwen Leng, Mahendra Pakala