Patents by Inventor Ganping Ju

Ganping Ju 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: 20210175417
    Abstract: A memristor may include an exchange-coupled composite (ECC) portion to provide three or more nonvolatile magneto-resistive states. The ECC portion may include a continuous layer and a granular layer magnetically exchange coupled to the continuous layer. A plurality of memristors may be used in a system to, for example, define a neural network.
    Type: Application
    Filed: February 22, 2021
    Publication date: June 10, 2021
    Inventors: Cheng Wang, Pin-Wei Huang, Ganping Ju, Kuo-Hsing Hwang
  • Patent number: 10930840
    Abstract: A memristor may include an exchange-coupled composite (ECC) portion to provide three or more nonvolatile magneto-resistive states. The ECC portion may include a continuous layer and a granular layer magnetically exchange coupled to the continuous layer. A plurality of memristors may be used in a system to, for example, define a neural network.
    Type: Grant
    Filed: January 23, 2019
    Date of Patent: February 23, 2021
    Assignee: Seagate Technology LLC
    Inventors: Cheng Wang, Pin-Wei Huang, Ganping Ju, Kuo-Hsing Hwang
  • Patent number: 10438614
    Abstract: An apparatus comprises a magnet housing dimensioned to receive a heat-assisted magnetic recording (HAMR) medium or a hard disk drive comprising at least one HAMR medium. A degausser is disposed in the magnet housing and is configured to generate at least one field sufficient to erase the HAMR medium, where the HAMR medium has a coercivity of between about 20 and 100 kOe at room temperature.
    Type: Grant
    Filed: April 11, 2017
    Date of Patent: October 8, 2019
    Assignee: Seagate Technology LLC
    Inventors: Kangkang Wang, Ganping Ju, Edward Charles Gage
  • Patent number: 10373637
    Abstract: Provided herein is an apparatus including a layer stack. A first granular metal layer overlies the layer stack, wherein the first granular metal layer includes first metal grains separated by voids. A first granular non-metal layer overlies the first granular metal layer, wherein the first granular non-metal layer includes first non-metal grains separated by a first segregant. A second granular non-metal layer overlies the first granular non-metal layer, wherein the second granular non-metal layer includes second non-metal grains separated by a second segregant. A second granular metal layer overlies the second granular non-metal layer, wherein the second granular metal layer includes second metal grains separated by a third segregant.
    Type: Grant
    Filed: March 2, 2017
    Date of Patent: August 6, 2019
    Assignee: Seagate Technology LLC
    Inventors: Bin Lu, Jan-Ulrich Thiele, Ganping Ju, Xiaoding Ma, YingGuo Peng, YinFeng Ding
  • Publication number: 20190229260
    Abstract: A memristor may include an exchange-coupled composite (ECC) portion to provide three or more nonvolatile magneto-resistive states. The ECC portion may include a continuous layer and a granular layer magnetically exchange coupled to the continuous layer. A plurality of memristors may be used in a system to, for example, define a neural network.
    Type: Application
    Filed: January 23, 2019
    Publication date: July 25, 2019
    Inventors: Cheng Wang, Pin-Wei Huang, Ganping Ju, Kuo-Hsing Hwang
  • Patent number: 10310182
    Abstract: The embodiments disclose a stack feature of a stack configured to confine optical fields within and to a patterned plasmonic underlayer in the stack configured to guide light from a light source to regulate optical coupling.
    Type: Grant
    Filed: October 16, 2013
    Date of Patent: June 4, 2019
    Assignee: Seagate Technology LLC
    Inventors: Ganping Ju, Chubing Peng, Xiaobin Zhu, Yingguo Peng, Yukiko Kubota, Timothy J Klemmer, Jan-Ulrich Thiele, Michael A. Seigler, Werner Scholz, Kim Y. Lee, David S. Kuo, Koichi Wago
  • Patent number: 10249335
    Abstract: A heat-assisted magnetic recording media structure with exchange-coupled composite layer structure may be utilized in a data storage device. The heat-assisted magnetic recording disk structure can have a FePt-based layer as a storage layer and a FePt-based or a CoPt-based magnetic layer with higher Curie temperature as a write layer. The interface between the write layer and the storage layer may be separated by an exchange control layer. The composite structure can be optimized to reduce jitter for high density data storage by tuning the exchange coupling between the write layer and storage layer.
    Type: Grant
    Filed: September 22, 2017
    Date of Patent: April 2, 2019
    Assignees: Seagate Technology LLC, Regents of the University of Minnesota
    Inventors: Randall Victora, Zengyuan Liu, Pin-wei Huang, Ganping Ju, Jan-Ulrich Thiele
  • Publication number: 20190027173
    Abstract: An apparatus is disclosed. The apparatus includes a first write layer, a second write layer, and a storage layer. The first write layer is disposed over the storage layer. The second write layer is disposed over the first write layer. The anisotropy field of the storage layer is greater than anisotropy field of the first write layer. The anisotropy field of the first write layer is greater than anisotropy field of the second write layer. The Curie temperature of the second write layer is greater than the Curie temperature of the first write layer. The Curie temperature of the first write layer is greater than a Curie temperature of the storage layer.
    Type: Application
    Filed: July 19, 2017
    Publication date: January 24, 2019
    Inventors: YinFeng DING, Pin-Wei HUANG, Ganping JU, Yingguo PENG, Li GAO, Timothy J. KLEMMER, Kai-Chieh CHANG, Yukiko KUBOTA, Florin ZAVALICHE, Xiaobin ZHU, Qihong WU, Hassib AMINI, Jan-Ulrich THIELE
  • Patent number: 10134446
    Abstract: An apparatus comprises a spindle to rotate a magnetic recording medium and a magnetic field generator to expose a track of the medium to a DC magnetic field. The magnetic field generator is configured to saturate the track during an erase mode and reverse the DC magnetic field impinging the track during a writing mode. A laser arrangement heats the track during the erase mode and, during the writing mode, heats the track while the track is exposed to the reversed DC magnetic field so as to write a magnetic pattern thereon. A reader reads the magnetic pattern and generates a read signal. A processor is coupled to the reader and configured to determine an anisotropy parameter using the read signal. The apparatus can further comprise a Kerr sensor that generates a Kerr signal using the magnetic pattern.
    Type: Grant
    Filed: March 12, 2018
    Date of Patent: November 20, 2018
    Assignee: Seagate Technology LLC
    Inventors: Kangkang Wang, Xiaobin Zhu, Ganping Ju, Kai Chieh Chang, Yingguo Peng, Timothy J. Klemmer, Jan-Ulrich Thiele, Pin-Wei Huang
  • Publication number: 20180254061
    Abstract: Provided herein is an apparatus including a layer stack. A first granular metal layer overlies the layer stack, wherein the first granular metal layer includes first metal grains separated by voids. A first granular non-metal layer overlies the first granular metal layer, wherein the first granular non-metal layer includes first non-metal grains separated by a first segregant. A second granular non-metal layer overlies the first granular non-metal layer, wherein the second granular non-metal layer includes second non-metal grains separated by a second segregant. A second granular metal layer overlies the second granular non-metal layer, wherein the second granular metal layer includes second metal grains separated by a third segregant.
    Type: Application
    Filed: March 2, 2017
    Publication date: September 6, 2018
    Inventors: Bin LU, Jan-Ulrich THIELE, Ganping JU, Xiaoding MA, YingGuo PENG, YinFeng DING
  • Patent number: 10006884
    Abstract: Determining a Curie temperature (Tc) distribution of a sample comprising magnetic material involves subjecting the sample to an electromagnetic field, heating the sample over a range of temperatures, generating a signal representative of a parameter of the sample that changes as a function of changing sample temperature while the sample is subjected to the electromagnetic field, and determining the Tc distribution of the sample using the generated signal and a multiplicity of predetermined parameters of the sample.
    Type: Grant
    Filed: August 10, 2015
    Date of Patent: June 26, 2018
    Assignee: Seagate Technology LLC
    Inventors: Ganping Ju, Jason L Presseky, Roy W. Chantrell, Xiaowei Wu, Xi Chen, Xiaobin Zhu, Yingguo Peng
  • Patent number: 9984709
    Abstract: An apparatus is disclosed. The apparatus includes a storage layer, a thermal exchange control layer disposed over the storage layer, and a write layer disposed over the thermal exchange control layer. A Curie temperature of the thermal exchange control layer is lower than a Curie temperature of the storage layer. The Curie temperature of the thermal exchange control layer is lower than a Curie temperature of the write layer.
    Type: Grant
    Filed: March 22, 2017
    Date of Patent: May 29, 2018
    Assignee: Seagate Technology LLC
    Inventors: Pin-Wei Huang, YinFeng Ding, YingGuo Peng, Xiaobin Zhu, Kai-Chieh Chang, Yukiko Kubota, Timothy J. Klemmer, QiHong Wu, Ganping Ju, Jan-Ulrich Thiele, Florin Zavaliche
  • Patent number: 9940962
    Abstract: In some embodiments, a thermally assisted data recording medium has a recording layer formed of iron (Fe), platinum (Pt) and a transition metal T selected from a group consisting of Rhodium (Rh), Ruthenium (Ru), Osmium (Os) and Iridium (Ir) to substitute for a portion of the Pt content as FeYPtY-XTX with Y in the range of from about 20 at % to about 80 at % and X in the range of from about 0 at % to about 20 at %.
    Type: Grant
    Filed: August 28, 2015
    Date of Patent: April 10, 2018
    Assignee: Seagate Technology LLC
    Inventors: Jan-Ulrich Thiele, Yinfeng Ding, YingGuo Peng, Kai-Chieh Chang, Timothy John Klemmer, Li Gao, Yukiko Kubota, Ganping Ju
  • Publication number: 20180082713
    Abstract: A heat-assisted magnetic recording media structure with exchange-coupled composite layer structure may be utilized in a data storage device. The heat-assisted magnetic recording disk structure can have a FePt-based layer as a storage layer and a FePt-based or a CoPt-based magnetic layer with higher Curie temperature as a write layer. The interface between the write layer and the storage layer may be separated by an exchange control layer. The composite structure can be optimized to reduce jitter for high density data storage by tuning the exchange coupling between the write layer and storage layer.
    Type: Application
    Filed: September 22, 2017
    Publication date: March 22, 2018
    Inventors: Randall Victora, Zengyuan Liu, Pin-wei Huang, Ganping Ju, Jan-Ulrich Thiele
  • Patent number: 9916868
    Abstract: An apparatus comprises a spindle to rotate a magnetic recording medium and a magnetic field generator to expose a track of the medium to a DC magnetic field. The magnetic field generator is configured to saturate the track during an erase mode and reverse the DC magnetic field impinging the track during a writing mode. A laser arrangement heats the track during the erase mode and, during the writing mode, heats the track while the track is exposed to the reversed DC magnetic field so as to write a magnetic pattern thereon. A reader reads the magnetic pattern and generates a read signal. A processor is coupled to the reader and configured to determine an anisotropy parameter using the read signal. The apparatus can further comprise a Kerr sensor that generates a Kerr signal using the magnetic pattern.
    Type: Grant
    Filed: August 5, 2016
    Date of Patent: March 13, 2018
    Assignee: SEAGATE TECHNOLOGY LLC
    Inventors: Kangkang Wang, Xiaobin Zhu, Ganping Ju, Kai Chieh Chang, Yingguo Peng, Timothy J. Klemmer, Jan-Ulrich Thiele, Pin-Wei Huang
  • Patent number: 9911446
    Abstract: A three dimensional magnetic recording media can consist of a coupling layer disposed between first and second vertically stacked recording layers. The coupling layer can provide exchange or antiferromagnetic coupling and allow the respective recording layers to be individually heat selected to different first and second coupling strengths through application of heat from a heat source.
    Type: Grant
    Filed: July 3, 2017
    Date of Patent: March 6, 2018
    Assignee: Seagate Technology LLC
    Inventors: Joachim Ahner, David M. Tung, Ganping Ju, Philip L. Steiner, Thomas P. Nolan, Thomas Y. Chang, Pin-Wei Huang, Kaizhong Gao, Timothy Klemmer, David S. Kuo
  • Patent number: 9899050
    Abstract: One embodiment described herein is directed to a method involving depositing a seed layer on a substrate, the seed layer comprising A1 phase FePt with a ratio of Pt of Fe greater than 1:1. A main layer is deposited on the seed layer, the main layer comprising A1 phase FePt with a ratio of Pt to Fe of approximately 1:1. A cap layer is deposited on the main layer, the cap layer comprising A1 phase FePt with a ratio of Pt to Fe of less than 1:1. The seed, main and cap layers are annealed to convert the A1 phase FePt to L10 phase FePt having a graded FePt structure of varying stoichimetry from approximately Fe50Pt50 adjacent a lower portion of the structure proximate the substrate to Fe>50Pt<50 adjacent an upper portion of the structure opposite the lower portion.
    Type: Grant
    Filed: December 12, 2016
    Date of Patent: February 20, 2018
    Assignee: Seagate Technology LLC
    Inventors: Jiaoming Qiu, Yonghua Chen, Ganping Ju, Thomas P. Nolan
  • Patent number: 9799363
    Abstract: A magnetic stack includes a substrate and a magnetic recording layer disposed over the substrate. The magnetic recording layer comprises magnetic crystalline grains and a segregant disposed between grain boundaries of the crystalline grains. One or both of the magnetic crystalline grains and the segregant are doped with a rare earth or transition metal dopant in an amount that provides the magnetic recording layer with a magnetic damping value, ?, between about 0.1 to about 1.
    Type: Grant
    Filed: March 13, 2013
    Date of Patent: October 24, 2017
    Assignee: SEAGATE TECHNOLOGY, LLC
    Inventors: Xi Chen, Yingguo Peng, Jan-Ulrich Thiele, Ganping Ju, Thomas Roscamp
  • Publication number: 20170301366
    Abstract: A stack includes a substrate, a magnetic recording layer having a columnar structure, and an interlayer disposed between the substrate and the magnetic recording layer. The columnar structure includes magnetic grains separated by a crystalline segregant or a combination of crystalline and amorphous segregants.
    Type: Application
    Filed: June 27, 2017
    Publication date: October 19, 2017
    Inventors: Jingsheng Chen, Kaifeng Dong, Ganping Ju, Yingguo Peng
  • Patent number: 9779771
    Abstract: A stack includes a substrate, a magnetic recording layer comprising FePtX disposed over the substrate, and a capping layer disposed on the magnetic recording layer. The capping layer comprises Co; at least one rare earth element; one or more elements selected from a group consisting of Fe and Pt; and an amorphizing agent comprising one to three elements selected from a group consisting of B, Zr, Ta, Cr, Nb, W, V, and Mo.
    Type: Grant
    Filed: March 29, 2016
    Date of Patent: October 3, 2017
    Assignee: SEAGATE TECHNOLOGY LLC
    Inventors: Kangkang Wang, Yingguo Peng, Ganping Ju, Xiaobin Zhu, Li Gao, Yinfeng Ding, Kai Chieh Chang, Timothy J. Klemmer, Yukiko Kubota, Jan-Ulrich Thiele, Thomas P. Nolan