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).

  • Plasmonic Transducer Having Two Metal Elements with a Gap Disposed Therebetween
    Publication number: 20130064051
    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 13, 2011
    Publication date: March 14, 2013
    Applicant: SEAGATE TECHNOLOGY LLC
    Inventors: Chubing Peng, Kaizhong Gao, Lien Lee, Amit Vasant Itagi, Michael Allen Seigler, Yimin Niu, Sethuraman Jayashankar
  • Hybrid near-field transducer for heat assisted magnetic recording
    Patent number: 8391108
    Abstract: An apparatus includes a planar waveguide having a core layer and a cladding layer adjacent to the core layer, the waveguide being shaped to direct light to a focal point; a magnetic pole adjacent to the cladding layer; and a near-field transducer positioned adjacent to the focal point, wherein the near-field transducer includes an enlarged portion and a peg having a first end positioned adjacent to an end of the waveguide and a second end positioned adjacent to a side of the enlarged portion. A data storage device that includes the apparatus is also provided.
    Type: Grant
    Filed: August 12, 2010
    Date of Patent: March 5, 2013
    Assignee: Seagate Technology LLC
    Inventors: Chubing Peng, Michael Allen Seigler, Jie Zou, Kaizhong Gao
  • Method for manufacturing a self-aligned bevel for a write pole
    Patent number: 8381392
    Abstract: A method, including depositing a layer of material onto a base portion of a wafer, is disclosed. The layer of material has a first surface adjacent the base portion. The method also includes depositing a pattern of masking material onto a portion of a second surface of the layer. Material from the layer of material that is unprotected by the pattern of masking material is removed from the layer of material. By removing such material a portion of the layer of material is suspended from the base portion.
    Type: Grant
    Filed: May 11, 2010
    Date of Patent: February 26, 2013
    Assignee: Seagate Technology LLC
    Inventors: Jie Zou, Kaizhong Gao
  • Near field transducer with shaped energy radiating end
    Patent number: 8385159
    Abstract: A magnetic recording head consists of a write pole and a near field transducer close to the write pole that focuses light energy to a focal point. A near field transducer is positioned to receive light energy from a waveguide. The near field transducer comprises an energy-receiving end and an energy-radiating end. The energy-receiving end is located near the focal point of the waveguide and the energy-radiating end is shaped such that it is narrower closer to the write pole and wider farther from the write pole.
    Type: Grant
    Filed: May 21, 2010
    Date of Patent: February 26, 2013
    Assignee: Seagate Technology LLC
    Inventors: Kaizhong Gao, Yongjun Zhao, William A. Challener, Xuhui Jin
  • SELF-ALIGNED BEVELS FOR WRITE POLES
    Publication number: 20130038965
    Abstract: A method, including depositing a layer of material onto a base portion of a wafer, is disclosed. The layer of material has a first surface adjacent the base portion. The method also includes depositing a pattern of masking material onto a portion of a second surface of the layer. Material from the layer of material that is unprotected by the pattern of masking material is removed from the layer of material. By removing such material a portion of the layer of material is suspended from the base portion.
    Type: Application
    Filed: August 27, 2012
    Publication date: February 14, 2013
    Applicant: SEAGATE TECHNOLOGY LLC
    Inventors: Jie Zou, Kaizhong Gao
  • Partial Magnetic Biasing of Magnetoresistive Sensor
    Publication number: 20130027032
    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: Application
    Filed: July 29, 2011
    Publication date: January 31, 2013
    Applicant: SEAGATE TECHNOLOGY LLC
    Inventors: Kaizhong Gao, Jiexuan He, Jiaoming Qiu
  • MAGNETIC MEMORY CELL CONSTRUCTION
    Publication number: 20130015543
    Abstract: A magnetic tunnel junction cell having a free layer, a ferromagnetic pinned layer, and a barrier layer therebetween. The free layer has a central ferromagnetic portion and a stabilizing portion radially proximate the central ferromagnetic portion. The construction can be used for both in-plane magnetic memory cells where the magnetization orientation of the magnetic layer is in the stack film plane and out-of-plane magnetic memory cells where the magnetization orientation of the magnetic layer is out of the stack film plane, e.g., perpendicular to the stack plane.
    Type: Application
    Filed: September 12, 2012
    Publication date: January 17, 2013
    Applicant: SEAGATE TECHNOLOGY LLC
    Inventors: Kaizhong Gao, Haiwen Xi
  • Shield with Continuously Concave Inner Sidewall
    Publication number: 20130004795
    Abstract: A write element for magnetic recording includes a main pole and a shield. The main pole has first and second sides with respect to a down-track direction. The shield at least partially surrounds the main pole with a continuously concave inner sidewall. The angle between the inner sidewall of the shield and the direction of motion of the write element is greater than the angle between the sides of the main pole and the direction of motion.
    Type: Application
    Filed: September 12, 2012
    Publication date: January 3, 2013
    Applicant: Seagate Technology LLC
    Inventors: Kaizhong Gao, Mourad Benakli
  • Discrete Track Media (DTM) Design and Fabrication for Heat Assisted Magnetic Recording (HAMR)
    Publication number: 20130003511
    Abstract: An apparatus includes a recording media including a substrate, a plurality of tracks of magnetic material on the substrate, and a non-magnetic material between the tracks; a recording head having an air bearing surface positioned adjacent to the recording media, and including a magnetic pole, an optical transducer, and a near-field transducer, wherein the near-field transducer directs electromagnetic radiation onto tracks to heat portions of the tracks and a magnetic field from the magnetic pole is used to create magnetic transitions in the heated portions of the tracks; and a plasmonic material positioned adjacent to the magnetic material to increase coupling between the electromagnetic radiation and the magnetic material.
    Type: Application
    Filed: September 10, 2012
    Publication date: January 3, 2013
    Applicant: Seagate Technology LLC
    Inventors: Kaizhong Gao, Michael Allen Seigler, Xuhui Jin, Ganping Ju, Bin Lu
  • Shield with continuously concave inner sidewall
    Patent number: 8345385
    Abstract: A write element for magnetic recording includes a main pole and a shield. The main pole has first and second sides with respect to a down-track direction. The shield at least partially surrounds the main pole with a continuously concave inner sidewall. The angle between the inner sidewall of the shield and the direction of motion of the write element is greater than the angle between the sides of the main pole and the direction of motion.
    Type: Grant
    Filed: October 29, 2010
    Date of Patent: January 1, 2013
    Assignee: Seagate Technology LLC
    Inventors: Kaizhong Gao, Mourad Benakli
  • Magnetic writer for patterned stack with increased write field
    Patent number: 8339735
    Abstract: A magnetic writer writes to a magnetic medium including a plurality of tracks that each includes a plurality of isolated magnetic elements for storage of information. The magnetic writer includes a write element having a write element tip having a leading edge, a trailing edge, and first and second side edges extending between the leading edge and the trailing edge. A side shield is proximate the first side edge and no shield is proximate the second side edge.
    Type: Grant
    Filed: June 29, 2007
    Date of Patent: December 25, 2012
    Assignee: Seagate Technology LLC
    Inventors: Michael L. Mallary, Ching He, Kaizhong Gao
  • Recording layer and multilayered soft underlayer
    Patent number: 8338005
    Abstract: A media for perpendicular recording and a method of creating the media is provided. The media includes a hard recording layer and a soft underlayer (SUL). The SUL is composed of at least two anti-ferromagnetically coupled (AFC) sub-underlayers. The sub-underlayers respond to a magnetic field established during dynamic reversal with respective magnetic fields. The sub-underlayers are formed and disposed to differ in one or more magnetic moment, anisotropy, and thickness, so that their respective magnetic fields constructively interfere in one or more points in the hard recording layer, thereby reducing a total SUL magnetic field response to the dynamic reversal field approximately to zero at one or more points in the hard recording layer, which reduces side track erasure.
    Type: Grant
    Filed: January 13, 2009
    Date of Patent: December 25, 2012
    Assignee: Seagate Technology LLC
    Inventors: Kaizhong Gao, Qixu Chen, Chung-Hee Chang, Thomas Patrick Nolan
  • Wire-assisted magnetic write device with low power consumption
    Patent number: 8339736
    Abstract: A magnetic device includes a write element having a write element tip and a conductive coil that carries current to induce a first field in the write element. A first conductor is proximate a leading edge of the write pole tip for carrying current to generate a second field that augments the first field.
    Type: Grant
    Filed: June 20, 2007
    Date of Patent: December 25, 2012
    Assignee: Seagate Technology LLC
    Inventors: Kaizhong Gao, Sining Mao, Eric S. Linville, Xuebing Feng, Shaoping Li, Steven Paul Bozeman
  • Recording head for heat assisted magnetic recording with diffusion barrier surrounding a near field transducer
    Patent number: 8339740
    Abstract: An apparatus includes a near field transducer positioned adjacent to an air bearing surface, a first magnetic pole, a heat sink positioned between the first magnetic pole and the near field transducer, and a diffusion barrier positioned between the near field transducer and the first magnetic pole. The diffusion barrier can be positioned adjacent to the magnetic pole or the near field transducer.
    Type: Grant
    Filed: February 23, 2011
    Date of Patent: December 25, 2012
    Assignee: Seagate Technology LLC
    Inventors: Jie Zou, Kaizhong Gao, William Albert Challener, Mark Henry Ostrowski, Venkateswara Rao Inturi, Tong Zhao, Michael Christopher Kautzky
  • Magnetic sensor including a free layer having perpendicular to the plane anisotropy
    Patent number: 8335058
    Abstract: A magnetic sensor includes a reference layer having a first magnetization direction and a free layer assembly having an effective magnetization direction substantially perpendicular to the first magnetization direction and substantially perpendicular to a plane of each layer of the free layer assembly. A spacer layer is between the reference layer and the free layer, and a signal enhancement layer is exchange coupled to the free layer assembly on a side opposite the spacer layer.
    Type: Grant
    Filed: March 15, 2011
    Date of Patent: December 18, 2012
    Assignee: Seagate Technology LLC
    Inventors: Song S. Xue, Zheng Gao, Shaoping Li, Kaizhong Gao, Dimitar V. Dimitrov, Konstantin Nikolaev, Patrick J. Ryan
  • Near-Field Transducers for Focusing Light
    Publication number: 20120314549
    Abstract: An apparatus includes a waveguide shaped to direct light to a focal point, and a near-field transducer positioned adjacent to the focal point, wherein the near-field transducer includes a dielectric component and a metallic component positioned adjacent to at least a portion of the dielectric component. An apparatus includes a waveguide shaped to direct light to a focal point, and a near-field transducer positioned adjacent to the focal point, wherein the near-field transducer includes a first metallic component, a first dielectric layer positioned adjacent to at least a portion of the first metallic component, and a second metallic component positioned adjacent to at least a portion of the first dielectric component.
    Type: Application
    Filed: August 21, 2012
    Publication date: December 13, 2012
    Applicant: SEAGATE TECHNOLOGY LLC
    Inventors: Lien Lee, Xuhui Jin, Kaizhong Gao, Amit Vasant Itagi, William Albert Challener
  • Magnetoresistive Shield
    Publication number: 20120281319
    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: Application
    Filed: May 6, 2011
    Publication date: November 8, 2012
    Applicant: SEAGATE TECHNOLOGY LLC
    Inventors: Eric W. Singleton, Jae-Young Yi, Kaizhong Gao, Dimitar V. Dimitrov, Dian Song, Vladyslav A. Vas'ko
  • Magnetic Element With Varying Stripe Heights
    Publication number: 20120275062
    Abstract: A magnetically responsive magnetic stack with a first stripe height is positioned laterally adjacent first and second side stacks that respectively extend a second and third distance from an air bearing surface (ABS). The second distance is greater than the third distance capable of biasing the magnetic stack to a predetermined magnetization.
    Type: Application
    Filed: April 26, 2011
    Publication date: November 1, 2012
    Applicant: SEAGATE TECHNOLOGY LLC
    Inventor: Kaizhong Gao
  • Magnetic memory cell construction
    Patent number: 8287944
    Abstract: A magnetic tunnel junction cell having a free layer, a ferromagnetic pinned layer, and a barrier layer therebetween. The free layer has a central ferromagnetic portion and a stabilizing portion radially proximate the central ferromagnetic portion. The construction can be used for both in-plane magnetic memory cells where the magnetization orientation of the magnetic layer is in the stack film plane and out-of-plane magnetic memory cells where the magnetization orientation of the magnetic layer is out of the stack film plane, e.g., perpendicular to the stack plane.
    Type: Grant
    Filed: March 28, 2011
    Date of Patent: October 16, 2012
    Assignee: Seagate Technology LLC
    Inventors: Kaizhong Gao, Haiwen Xi
  • Magnetic memory cell construction
    Patent number: 8288023
    Abstract: A magnetic tunnel junction cell having a free layer, a ferromagnetic pinned layer, and a barrier layer therebetween. The free layer has a central ferromagnetic portion and a stabilizing portion radially proximate the central ferromagnetic portion. The construction can be used for both in-plane magnetic memory cells where the magnetization orientation of the magnetic layer is in the stack film plane and out-of-plane magnetic memory cells where the magnetization orientation of the magnetic layer is out of the stack film plane, e.g., perpendicular to the stack plane.
    Type: Grant
    Filed: December 23, 2010
    Date of Patent: October 16, 2012
    Assignee: Seagate Technology LLC
    Inventors: Kaizhong Gao, Haiwen Xi