Patents by Inventor Changqing Shi

Changqing Shi has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Publication number: 20200327900
    Abstract: A magnetic recording write head has an electrically-conductive structure in the write gap between the write pole and the trailing shield and electrical circuitry for directing current through the write gap. The current through the electrically-conductive structure generates a circular Ampere field which, at the disk-facing end of the write pole, is substantially parallel to the disk-facing end of the write pole. The electrically-conductive structure in the write gap may be a STO or an electrically-conductive layer that is not part of a STO. The current direction through the electrically-conductive structure in the write gap is selected so that the generated Ampere field at the write pole end is in substantially the same direction as the magnetization direction of the write head side shields, which has been discovered to result in minimization of cross-track interference.
    Type: Application
    Filed: June 24, 2020
    Publication date: October 15, 2020
    Inventors: Zhigang BAI, Alexander TARATORIN, Anna ZHENG, Venkatesh CHEMBROLU, Supradeep NARAYANA, Suping SONG, Yaguang WEI, Terence LAM, Michael Kuok San HO, Changqing SHI, Lijie GUAN
  • Patent number: 10777219
    Abstract: Embodiments of the present disclosure generally relate to data storage devices, and more specifically, to storage devices employing an energy-assisted magnetic recording write head. The write head may comprise a main pole, a trailing shield, a conducting gap disposed between the main pole and the trailing shield, and one or more current blockers. The conducting gap may be conformal with the main pole. The one or more current blockers may be configured to direct the current from the main pole to the trailing shield through the conducting gap. The one or more current blockers may be further configured to recess the conducting gap away from the media facing surface. The one or more current blockers may be configured to direct the current away from a media facing surface of the write head.
    Type: Grant
    Filed: June 24, 2019
    Date of Patent: September 15, 2020
    Assignee: Western Digital Technologies, Inc.
    Inventors: Muhammad Asif Bashir, Yaguang Wei, Petrus Antonius Van Der Heijden, Xinjiang Shen, Terence Lam, Zhigang Bai, Youfeng Zheng, Changqing Shi, Michael Kuok San Ho, Jian-Gang Zhu, Lijie Guan, Venkatesh Chembrolu
  • Patent number: 10699734
    Abstract: A magnetic recording write head has an electrically-conductive structure in the write gap between the write pole and the trailing shield and electrical circuitry for directing current through the write gap. The current through the electrically-conductive structure generates a circular Ampere field which, at the disk-facing end of the write pole, is substantially parallel to the disk-facing end of the write pole. The electrically-conductive structure in the write gap may be a STO or an electrically-conductive layer that is not part of a STO. The current direction through the electrically-conductive structure in the write gap is selected so that the generated Ampere field at the write pole end is in substantially the same direction as the magnetization direction of the write head side shields, which has been discovered to result in minimization of cross-track interference.
    Type: Grant
    Filed: February 15, 2019
    Date of Patent: June 30, 2020
    Assignee: WESTERN DIGITAL TECHNOLOGIES, INC.
    Inventors: Zhigang Bai, Alexander Taratorin, Anna Zheng, Venkatesh Chembrolu, Supradeep Narayana, Suping Song, Yaguang Wei, Terence Lam, Michael Kuok San Ho, Changqing Shi, Lijie Guan
  • Publication number: 20190267029
    Abstract: A magnetic recording write head has an electrically-conductive structure in the write gap between the write pole and the trailing shield and electrical circuitry for directing current through the write gap. The current through the electrically-conductive structure generates a circular Ampere field which, at the disk-facing end of the write pole, is substantially parallel to the disk-facing end of the write pole. The electrically-conductive structure in the write gap may be a STO or an electrically-conductive layer that is not part of a STO. The current direction through the electrically-conductive structure in the write gap is selected so that the generated Ampere field at the write pole end is in substantially the same direction as the magnetization direction of the write head side shields, which has been discovered to result in minimization of cross-track interference.
    Type: Application
    Filed: February 15, 2019
    Publication date: August 29, 2019
    Inventors: Zhigang BAI, Alexander TARATORIN, Anna ZHENG, Venkatesh CHEMBROLU, Supradeep NARAYANA, Suping SONG, Yaguang WEI, Terence LAM, Michael Kuok San HO, Changqing SHI, Lijie GUAN
  • Patent number: 9087537
    Abstract: A system for providing transducer(s) including a disk structure and having an air-bearing surface (ABS) are described. The disk structure resides a distance from the ABS and has a disk dimension substantially perpendicular to the ABS. Lapping control and disk windage ELGs are provided. The lapping control ELG has first and second edges first and second distances from the ABS. The disk windage ELG has edges different distances from the ABS. A difference between these edges corresponds to the disk dimension. A windage resistance of the disk windage ELG is measured and a disk windage determined. The disk windage corresponds to a difference between designed and actual disk dimensions perpendicular to the ABS. A lapping ELG target resistance is determined based on the disk windage. The transducer is lapped. Lapping is terminated based on a resistance of the lapping control ELG and the lapping ELG target resistance.
    Type: Grant
    Filed: May 12, 2014
    Date of Patent: July 21, 2015
    Assignee: Western Digital (Fremont), LLC
    Inventors: Steven C. Rudy, Changqing Shi, Yufeng Hu, Mark D. Moravec, Eric R. McKie, Nurul Amin
  • 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: 8826515
    Abstract: A write head includes a first pole P1, a P1 pedestal, a first back gap layer plated on top of the first pole P1 leaving a region between the P1 pedestal and the first back gap layer for plating a coil. Further, a first insulation layer is applied on top of the P1 pedestal and the first back gap layer and the region between the P1 pedestal and the first back gap layer. The write head further includes a coil, patterned at least partially on top of the P1 pedestal and the first back gap layer and the region between the P1 pedestal and the first back gap layer, copper plated in the coil patterns, and a second insulation layer is applied to fill the spaces in between the coil turns. The resulting structure is planarized via chemical mechanical polishing.
    Type: Grant
    Filed: April 2, 2010
    Date of Patent: September 9, 2014
    Assignee: HGST Netherlands B.V.
    Inventors: Terence Tin-Lok Lam, David Kaimon Lee, Edward Hin Pong Lee, Changqing Shi
  • Patent number: 8758083
    Abstract: A method and system for providing transducer(s) including a disk structure and having an air-bearing surface (ABS) are described. The disk structure resides a distance from the ABS and has a disk dimension substantially perpendicular to the ABS. Lapping control and disk windage ELGs are provided. The lapping control ELG has first and second edges first and second distances from the ABS. The disk windage ELG has edges different distances from the ABS. A difference between these edges corresponds to the disk dimension. A windage resistance of the disk windage ELG is measured and a disk windage determined. The disk windage corresponds to a difference between designed and actual disk dimensions perpendicular to the ABS. A lapping ELG target resistance is determined based on the disk windage. The transducer is lapped. Lapping is terminated based on a resistance of the lapping control ELG and the lapping ELG target resistance.
    Type: Grant
    Filed: September 13, 2010
    Date of Patent: June 24, 2014
    Assignee: Western Digital (Fremont), LLC
    Inventors: Steven C. Rudy, Changqing Shi, Yufeng Hu, Mark D. Moravec, Eric R. McKie, Nurul Amin
  • Patent number: 8717709
    Abstract: A wafer comprises a transducer having an air-bearing surface (ABS) and including a magnetic structure characterized by a desired thickness, and having a bevel and a flare point a first distance from the ABS. The wafer further comprises a first electronic lapping guide (ELG), a second ELG, and a third ELG. The first ELG has a first edge a first distance from the ABS and a second edge a second distance from the ABS. The second ELG has a third edge a third distance from the ABS and a fourth edge the second distance from the ABS. The third ELG has a fifth edge a fourth distance from the ABS and a sixth edge the second distance from the ABS. At least one of the first distance and the second distance, at least one of the third distance and the second distance, and at least one of the fourth distance and the second distance correspond to an intersection between the bevel and the desired thickness.
    Type: Grant
    Filed: September 24, 2012
    Date of Patent: May 6, 2014
    Assignee: Western Digital (Fremont), LLC
    Inventors: Changqing Shi, Ming Jiang
  • Patent number: 8444866
    Abstract: A method for fabricating a magnetic transducer having a nonmagnetic intermediate layer is described. A trench is provided in the intermediate layer. The trench has a profile and location corresponding to a pole. A first nonmagnetic gap layer is provided. At least part of the first nonmagnetic gap layer resides in the trench. A pole including magnetic material(s) is provided. At least part of the pole resides in the trench and on the part of the nonmagnetic layer in the trench. At least part of the intermediate layer adjacent to the pole is removed and a second nonmagnetic gap layer provided. The second nonmagnetic gap layer is thicker than the first nonmagnetic gap layer. Part of the second nonmagnetic layer and part of the first nonmagnetic layer adjacent to the pole form a side gap. A side shield, a gap, and a top shield are also provided.
    Type: Grant
    Filed: September 21, 2010
    Date of Patent: May 21, 2013
    Assignee: Westen Digital (Fremont), LLC
    Inventors: Lijie Guan, Changqing Shi, Ming Jiang, Yun-Fei Li, Ying Hong
  • 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: 8409453
    Abstract: A method and system for fabricating magnetic recording transducer are described. The magnetic recording transducer has a main pole, a nonmagnetic gap covering the main pole, and a field region distal from the main pole. A portion of the nonmagnetic gap resides on the top of the main pole. The method and system include providing a patterned seed layer. A thick portion of the patterned seed layer is thicker than a thin portion of the patterned seed layer. At least part of the thick portion of the patterned seed layer resides on a portion of the field region. A wrap-around shield is on the patterned seed layer. At least part of the thin portion of the patterned seed layer is in proximity to and exposed by the wrap-around shield. The method and system also include field etching the field region distal from the wrap-around shield.
    Type: Grant
    Filed: May 12, 2010
    Date of Patent: April 2, 2013
    Assignee: Western Digital (Fremont), LLC
    Inventors: Ming Jiang, Changqing Shi
  • Patent number: 8331058
    Abstract: A method and apparatus for providing a write head with an improved pole tip to improve overwrite and/or adjacent track interference. A cross pole tip writer is provided with a shape that is designed to reduce the saturation on the pole tip and aid in the concentration of flux to the down track.
    Type: Grant
    Filed: May 28, 2004
    Date of Patent: December 11, 2012
    Assignee: Hitachi Global Storage Technologies Netherlands B.V.
    Inventors: Savas Gider, Wen-Chien David Hsiao, Quan-chiu Harry Lam, Terence Tin-Lok Lam, Edward Hin Pong Lee, Yansheng Luo, Vladimir Nikitin, Changqing Shi, Xiaoyu Sui
  • Patent number: 8291743
    Abstract: A method and system for calibrating an electronic lapping guide (ELG) for transducer(s) having an ABS and a magnetic structure are described. The magnetic structure has a desired thickness, a bevel, and a flare point a distance from the ABS. The method and system include providing at least three ELGs. A first ELG has first and second edges first and second distances from the ABS. A second ELG has third and fourth edges third and second distances from the ABS. A third ELG has fifth and sixth edges fourth and second distances from the ABS. The first, third, and fourth distances correspond to a stripe height and an offset. The first, third, and fourth distance and/or the second distance corresponds to an intersection between the bevel and the desired thickness. The method and system also include measuring resistances of the ELGs, and calibrating the ELG(s) utilizing the offset and resistances.
    Type: Grant
    Filed: May 27, 2009
    Date of Patent: October 23, 2012
    Assignee: Western Digital (Fremont), LLC
    Inventors: Changqing Shi, Ming Jiang
  • Patent number: 8276257
    Abstract: A method and apparatus for providing a write head having well-defined, precise write head pole tips. A coplanar write head pole tip processing method provides a thin-film magnetic write head pole tip layer and defines first and second pole tips from the pole tip layer. When the pole tips are provided on a write head, a write gap can be defined using ion milling, E-beam lithography, FAB or can be deposited. The write head pole tips can be used in conjunction with read heads by merging a read head with a write head or a read head can be bonded to a write head in a piggybacked fashion.
    Type: Grant
    Filed: July 30, 2004
    Date of Patent: October 2, 2012
    Assignee: Hitachi Global Storage Technologies Netherlands B.V.
    Inventors: Terence Tin-Lok Lam, Vladimir Nikitin, Changqing Shi, Samuel Yuan
  • Patent number: 8262919
    Abstract: A method and system for providing a pole of magnetic transducer having an intermediate layer are described. The method and system include providing a trench in the intermediate layer and depositing a nonmagnetic liner. A portion of the nonmagnetic liner resides in the trench. At least one seed layer is deposited. A portion of the at least one seed layer resides in the trench. The method and system include depositing at least one main pole layer. The at least one main pole layer is magnetic. A portion of the main pole layer(s) reside in the trench. The method and system also include performing a first chemical mechanical planarization (CMP). An excess portion of the seed layer(s) external to the trench are removed through an ion beam etch. The method and system further include performing a second CMP to remove an excess portion of the nonmagnetic liner external to the trench.
    Type: Grant
    Filed: June 25, 2010
    Date of Patent: September 11, 2012
    Assignee: Western Digital (Fremont), LLC
    Inventors: Guanghong Luo, Changqing Shi, Danning Yang, Jinwen Wang, Ming Jiang
  • Patent number: 8257597
    Abstract: Methods of forming a write pole are disclosed. A first photomask having a first opening over one of a yoke region and a pole tip region of the write pole is formed over an insulation layer having an insulator material. A first etch process is performed on the insulation layer via the first opening, the first etch process removing the insulator material from a corresponding one of the yoke region and the pole tip region. A second photomask having a second opening over the other one of the yoke region and the pole tip region is formed over the insulation layer. A second etch process is performed on the insulation layer via the second opening, the second etch process removing the insulator material from a corresponding one of the yoke region and the pole tip region.
    Type: Grant
    Filed: March 3, 2010
    Date of Patent: September 4, 2012
    Assignee: Western Digital (Fremont), LLC
    Inventors: Lijie Guan, Changqing Shi, Ming Jiang, Yun-Fei Li
  • Patent number: 8254060
    Abstract: A magnetic recording head includes a write pole comprising a throat region. The throat region includes a lower portion having a substantially trapezoidal cross-section, and an upper portion having a substantially rectangular cross-section. In a beveled region of the write pole, the substantially rectangular cross-section of the upper portion decreases in height towards an air bearing surface of the magnetic recording head.
    Type: Grant
    Filed: April 17, 2009
    Date of Patent: August 28, 2012
    Assignee: Western Digital (Fremont), LLC
    Inventors: Changqing Shi, Ming Jiang
  • Patent number: 8179634
    Abstract: Methods and structures for the fabrication of a thin film, perpendicular recording write head are disclosed. The structure provides a pole tip separated from a rear pole by a non-magnetic separation layer located adjacent the flare point. The rear pole contains an imbedded non-magnetic layer. The separated pole tip and imbedded layer aid in the high data rate recording as well as the erasure performance of the write pole structure. The fabrication involves the deposition of two different oxide layers which have mutually high etch selectivities. This characteristic allows a write pole structure to be built wherein the track width is independent of the location of the flare point. The process also produces a structure wherein the placement of the throat height of the shield is self aligned to the flare point of the write pole.
    Type: Grant
    Filed: December 27, 2007
    Date of Patent: May 15, 2012
    Assignee: Hitachi Global Storage Technologies Netherlands B.V.
    Inventors: Wen-Chien David Hsiao, Ming Jiang, Changqing Shi
  • Patent number: 8111479
    Abstract: A magnetic write head for perpendicular magnetic data recording having a trailing shield with a two step throat height. The trailing shield is formed over a non-magnetic bump that forms a notch in the leading edge of the trailing shield. This notch defines a first, smaller throat height closest to the write pole and a larger throat height away from the write pole. The smaller throat height near the write pole prevents excess magnetic flux from leaking to the write pole, thereby ensuring efficient strong write field. The larger trailing shield throat height away from the write pole prevents magnetic saturation of the trailing shield and also greatly facilitates manufacturing avoiding problems related to variations and deviations in manufacturing processes used to define the trailing shield.
    Type: Grant
    Filed: October 23, 2007
    Date of Patent: February 7, 2012
    Assignee: Hitachi Global Storage Technologies Netherlands B.V.
    Inventors: Tsung Yuan Chen, Wen-Chien David Hsiao, Yimin Hsu, Vladimir Nikitin, Changqing Shi