Patents by Inventor Kaizhong Gao

Kaizhong Gao 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).

  • Protected transducer for dead layer reduction
    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
  • Partial magnetic biasing of magnetoresistive sensor
    Patent number: 9041391
    Abstract: Various embodiments can be generally directed to a magnetoresistive stack with a first stripe height and a biasing magnet positioned adjacent the magnetoresistive stack. The biasing magnet can have a second stripe height that is less than the first stripe height. The first and second stripe heights may correspond to a minimum signal to noise ratio in the magnetoresistive stack.
    Type: Grant
    Filed: July 29, 2011
    Date of Patent: May 26, 2015
    Assignee: Seagate Technology LLC
    Inventors: Kaizhong Gao, Jiexuan He, Jiaoming Qiu
  • DERIVING AN OPERATIONAL STATE OF A DATA CENTER USING A PREDICTIVE COMPUTER ANALYSIS MODEL
    Publication number: 20150120636
    Abstract: Performance of a data center is predicted using a computer analysis model. Operational measurements of components of computing nodes of the data center are received as input to the computer analysis model. An operational state of the data center is derived via the computer analysis model responsive to the operational measurements.
    Type: Application
    Filed: October 29, 2013
    Publication date: April 30, 2015
    Applicant: Seagate Technology LLC
    Inventor: Kaizhong Gao
  • Perpendicular magnetic recording media with magnetic anisotropy gradient and local exchange coupling
    Patent number: 8962164
    Abstract: A perpendicular magnetic recording medium adapted for high recording density and high data recording rate comprises a non-magnetic substrate having at least one surface with a layer stack formed thereon, the layer stack including a perpendicular recording layer containing a plurality of columnar-shaped magnetic grains extending perpendicularly to the substrate surface for a length, with a first end distal the surface and a second end proximal the surface, wherein each of the magnetic grains has: (1) a gradient of perpendicular magnetic anisotropy field Hk extending along its length between the first end and second ends; and (2) predetermined local exchange coupling strengths along the length.
    Type: Grant
    Filed: August 6, 2013
    Date of Patent: February 24, 2015
    Assignee: Seagate Technology LLC
    Inventors: Shaoping Li, Kaizhong Gao, Lei Wang, Wenzhong Zhu, Xiaobin Wang
  • Plasmonic transducer having two metal elements with a gap disposed therebetween
    Patent number: 8953272
    Abstract: An apparatus includes a waveguide configured to deliver light to a transducer region. The apparatus also includes a plasmonic transducer that has two metal elements configured as side-by-side plates on a substrate-parallel plane with a gap therebetween. The gap is disposed along the substrate-parallel plane and has an input end disposed proximate the transducer region and an output end. The transducer is configured to provide a surface plasmon-enhanced near-field radiation pattern proximate the output end in response to the light received by the waveguide.
    Type: Grant
    Filed: September 2, 2014
    Date of Patent: February 10, 2015
    Assignee: Seagate Technology LLC
    Inventors: Chubing Peng, Kaizhong Gao, Lien Lee, Amit Itagi, Michael Allen Seigler, Yimin Niu, Sethuraman Jayashankar
  • Transducer head temperature monitoring
    Patent number: 8937853
    Abstract: Changes in the thermal boundary condition near a close point of an ABS to a media indicate proximity of the ABS with the media. Before contact, heat conduction from the ABS is primarily through convective and/or ballistic heat transfer to air between the ABS and the media. After contact, heat flux primarily flows from the ABS to the media through solid-solid conductive contact. Further, a light source within a HAMR transducer head may create additional thermal variations within the transducer head. These thermal variations create temperature variations within the transducer head. Two resistance temperature sensors on the transducer head at varying distances from the close point and/or light source measure these temperature variations. A temperature difference between the two resistance temperature sensors indicates proximity of the close point to the media and/or light output.
    Type: Grant
    Filed: July 23, 2014
    Date of Patent: January 20, 2015
    Assignee: Seagate Technology LLC
    Inventors: Xuan Zheng, Timothy William Stoebe, Jorge Hanchi, Kaizhong Gao
  • PLASMONIC FUNNEL FOR FOCUSED OPTICAL DELIVERY TO A METALLIC MEDIUM
    Publication number: 20150016234
    Abstract: An apparatus includes a transducer including a plasmonic funnel having first and second ends with the first end having a smaller cross-sectional area than the second end, and a first section positioned adjacent to the first end of the plasmonic funnel, and a first waveguide having a core, positioned to cause light in the core to excite surface plasmons on the transducer.
    Type: Application
    Filed: October 3, 2014
    Publication date: January 15, 2015
    Inventors: Amit Vasant Itagi, Jie Zou, Kaizhong Gao, Michael Allen Seigler
  • Recording head including NFT and heatsink
    Patent number: 8934198
    Abstract: An apparatus including a near field transducer positioned adjacent to an air bearing surface, the near field transducer comprising silver (Ag) and at least one other element or compound; a first magnetic pole; and a heat sink positioned between the first magnetic pole and the near field transducer, wherein the heat sink includes: rhodium (Rh) or an alloy thereof; ruthenium (Ru) or an alloy thereof; titanium (Ti) or an alloy thereof; tantalum (Ta) or an alloy thereof; tungsten (W) or an alloy thereof; borides; nitrides; transition metal oxides; or palladium (Pd) or an alloy thereof.
    Type: Grant
    Filed: October 24, 2013
    Date of Patent: January 13, 2015
    Assignee: Seagate Technology LLC
    Inventors: Jie Zou, Kaizhong Gao, William Albert Challener, Mark Henry Ostrowski, Vankateswara Rao Inturi, Tong Zhao, Michael Christopher Kautzky
  • Heater assembly and method of heating
    Patent number: 8929016
    Abstract: A magnetic recording head includes a magnetic writer comprising a main write pole and a return write pole. The magnetic recording head includes a write heater assembly comprising at least one first heater subassembly and at least one second heater subassembly. At least part of the magnetic write head is disposed between the first heater subassembly and the second heater subassembly. When the first heater subassembly, the second heater subassembly, and the magnetic writer are energized, a variation in the thermal protrusion of the head media interface of the magnetic recording head may be less than about 20 nm along the down track and/or cross track directions.
    Type: Grant
    Filed: March 14, 2013
    Date of Patent: January 6, 2015
    Assignee: Seagate Technology LLC
    Inventors: Kaizhong Gao, Raul Horacio Andruet, Xiaobin Wang
  • Plasmonic transducer with reduced cross section at media-reading surface
    Patent number: 8929698
    Abstract: A plasmonic transducer includes at least two metal elements with a gap therebetween. The metal elements are placed along a plasmon-enhanced, near-field radiation delivery axis. Cross sections of the metal elements in a plane normal to the delivery axis vary in shape along the delivery axis. The metal elements have a reduced cross section portion at a media-facing surface oriented normal to the delivery axis. A dielectric material surrounds the reduced cross section portion of the plasmonic transducer at the media-facing surface, and reduces deformation of the metal elements proximate the media-facing surface at elevated temperatures.
    Type: Grant
    Filed: November 13, 2012
    Date of Patent: January 6, 2015
    Assignee: Seagate Technology LLC
    Inventors: Chubing Peng, Kaizhong Gao, Yongjun Zhao
  • Multi-layer magnetoresistive shield with transition metal layer
    Patent number: 8922950
    Abstract: A magnetic shield that is capable of enhancing magnetic reading. In accordance with various embodiments, a magnetic element has a magnetically responsive stack shielded from magnetic flux and biased to a predetermined default magnetization by at least one lateral side shield that has a transition metal layer disposed between first and second ferromagnetic layers.
    Type: Grant
    Filed: May 6, 2011
    Date of Patent: December 30, 2014
    Assignee: Seagate Technology LLC
    Inventors: Eric W. Singleton, Jae-Young Yi, Kaizhong Gao, Dimitar V. Dimitrov, Dian Song, Vladyslav A. Vas′ko
  • PLASMONIC TRANSDUCER HAVING TWO METAL ELEMENTS WITH A GAP DISPOSED THEREBETWEEN
    Publication number: 20140369174
    Abstract: An apparatus includes a waveguide configured to deliver light to a transducer region. The apparatus also includes a plasmonic transducer that has two metal elements configured as side-by-side plates on a substrate-parallel plane with a gap therebetween. The gap is disposed along the substrate-parallel plane and has an input end disposed proximate the transducer region and an output end. The transducer is configured to provide a surface plasmon-enhanced near-field radiation pattern proximate the output end in response to the light received by the waveguide.
    Type: Application
    Filed: September 2, 2014
    Publication date: December 18, 2014
    Inventors: Chubing Peng, Kaizhong Gao, Lien Lee, Amit Itagi, Michael Allen Seigler, Yimin Niu, Sethuraman Jayashankar
  • Magnetic read head with a read function feature
    Patent number: 8896972
    Abstract: In some examples, a system comprising a data storage member including a magnetic storage medium, the magnetic storage medium having a plurality of magnetic bit domains aligned on at least one data track, where a transition boundary between respective magnetic bit domains defines a transition curvature. The system may further comprise a magnetic read head including a first shield layer, a second shield layer, and a read sensor stack provided proximate to the first and second shield layers, where the magnetic read head senses a magnetic field of each of the plurality of magnetic bit domains according to a read playback sensitivity function. In some examples, the shield layers and read sensor stack may be configured to provide a reader playback sensitivity function that substantially corresponds to the shape of the respective magnetic bit domains.
    Type: Grant
    Filed: February 8, 2010
    Date of Patent: November 25, 2014
    Assignee: Seagate Technology LLC
    Inventors: Kaizhong Gao, Xilin Peng, Zhongyan Wang, Yonghua Chen
  • TRANSDUCER HEAD TEMPERATURE MONITORING
    Publication number: 20140334275
    Abstract: Changes in the thermal boundary condition near a close point of an ABS to a media indicate proximity of the ABS with the media. Before contact, heat conduction from the ABS is primarily through convective and/or ballistic heat transfer to air between the ABS and the media. After contact, heat flux primarily flows from the ABS to the media through solid-solid conductive contact. Further, a light source within a HAMR transducer head may create additional thermal variations within the transducer head. These thermal variations create temperature variations within the transducer head. Two resistance temperature sensors on the transducer head at varying distances from the close point and/or light source measure these temperature variations. A temperature difference between the two resistance temperature sensors indicates proximity of the close point to the media and/or light output.
    Type: Application
    Filed: July 23, 2014
    Publication date: November 13, 2014
    Inventors: Xuan Zheng, Timothy William Stoebe, Jorge Hanchi, Kaizhong Gao
  • Perpendicular write head with laminated side shields
    Patent number: 8848316
    Abstract: A perpendicular write head, the write head having an air bearing surface, the write head including a magnetic write pole, wherein at the air bearing surface, the write pole has a trailing side, a leading side that is opposite the trailing side, and first and second sides; side gaps, wherein the side gaps are proximate the write pole along the first and second side edges; and side shields proximate the side gaps, wherein the side shields have gap facing surfaces and include at least one set of alternating layers of magnetic and non-magnetic materials, wherein only one kind of material makes up the gap facing surfaces at the air bearing surfaces.
    Type: Grant
    Filed: September 28, 2010
    Date of Patent: September 30, 2014
    Assignee: Seagate Technology LLC
    Inventors: Mark Thomas Kief, Alexandru Cazacu, Kaizhong Gao, Mark Anthony Gubbins, Ibro Tabakovic, Christina Laura Hutchinson, David Christopher Seets, James Gary Wessel
  • Recording head including a near field transducer
    Patent number: 8842391
    Abstract: An apparatus including a near field transducer positioned adjacent to an air bearing surface, the near field transducer including an electrically conductive nitride; a first magnetic pole; and a heat sink, a diffusion barrier layer, or both positioned between the first magnetic pole and the near field transducer, wherein the heat sink, the diffusion barrier or both include rhodium (Rh) or an alloy thereof; ruthenium (Ru) or an alloy thereof titanium (Ti) or an alloy thereof tantalum (Ta) or an alloy thereof tungsten (W) or an alloy thereof borides; nitrides; transition metal oxides; or palladium (Pd) or an alloy thereof.
    Type: Grant
    Filed: October 24, 2013
    Date of Patent: September 23, 2014
    Assignee: Seagate Technology LLC
    Inventors: Jie Zou, Kaizhong Gao, William Albert Challener, Mark Henry Ostrowski, Venkateswara Rao Inturi, Tong Zhao, Michael Christopher Kautzky
  • Plasmonic transducer having two metal elements with a gap disposed therebetween
    Patent number: 8824086
    Abstract: An apparatus includes a waveguide configured to deliver light to a transducer region. The apparatus also includes a plasmonic transducer that has two metal elements configured as side-by-side plates on a substrate-parallel plane with a gap therebetween. The gap is disposed along the substrate-parallel plane and has an input end disposed proximate the transducer region and an output end. The transducer is configured to provide a surface plasmon-enhanced near-field radiation pattern proximate the output end in response to the light received by the waveguide.
    Type: Grant
    Filed: May 28, 2013
    Date of Patent: September 2, 2014
    Assignee: Seagate Technology LLC
    Inventors: Chubing Peng, Kaizhong Gao, Lien Lee, Amit Itagi, Michael Allen Seigler, Yimin Niu, Sethuraman Jayashankar
  • Light source power control for heat assisted magnetic recording (HAMR)
    Patent number: 8824249
    Abstract: Apparatus and method for light source power control during the writing of data to a storage medium. In accordance with various embodiments, a data recording head is provided having a magnetic transducer and a light source. The light source is driven at a first power level to irradiate an adjacent storage medium prior to the writing if data to the medium using the magnetic transducer. The first power level is insufficient to alter a magnetization state of the medium. The light source is subsequently transitioned to a higher, second power level to irradiate the storage medium during the writing of data to said medium using the magnetic transducer, the second power level being sufficient to alter said magnetization state of the medium.
    Type: Grant
    Filed: July 1, 2013
    Date of Patent: September 2, 2014
    Assignee: Seagate Technology LLC
    Inventors: Mehmet Fatih Erden, Edward Charles Gage, Darren W. Karns, Yimin Niu, Kaizhong Gao
  • Magnetic recording head having a pole tip shield and a pole-shield gap region
    Patent number: 8810964
    Abstract: A write element including a pole tip shield is disclosed. In embodiments disclosed, for example, the pole tip shield includes side shield portions fabricated of a graded magnetic moment material to form graded side shield portions having a magnetic moment that decreases in the down-track direction along a length of the side shield portions. In another embodiment, the pole tip shield includes side shield portions having a shortened length extending along a partial length of side edges of the pole tip. In illustrated embodiments, the side shield portions are formed of a contoured body having an indented portion forward of the leading edge of the pole tip. The indented portion has a rounded indented surface contour forming a rounded profile for a gap region between a leading edge portion of the pole tip shield forward of the leading edge of the pole tip.
    Type: Grant
    Filed: September 15, 2010
    Date of Patent: August 19, 2014
    Assignee: Seagate Technology LLC
    Inventors: Kaizhong Gao, Eric Meloche, Jianhua Xue, Eric S. Linville, Dehua Han, Huaqing Yin
  • REDUCED SPACING RECORDING APPARATUS
    Publication number: 20140212690
    Abstract: Aspects include recording media with enhanced areal density through reduction of head media spacing, head keeper spacing, or head to soft underlayer spacing. Such aspects comprise replacing currently non-magnetic components of devices, such as interlayers and overcoats with components and compositions comprising magnetic materials. Other aspects relate to magnetic seed layers deposited within a recording medium. Preferably, these aspects, embodied as methods, systems and/or components thereof reduce effective magnetic spacing without sacrificing physical spacing.
    Type: Application
    Filed: January 22, 2014
    Publication date: July 31, 2014
    Applicant: Seagate Technology LLC
    Inventors: Kaizhong Gao, Bin Lu, Bogdan Florin Valcu, Xiaoding Ma