Patents Assigned to Seagate Technology
  • Heat source management in data storage device
    Patent number: 8537644
    Abstract: An apparatus and associated method is presently disclosed for a control circuitry capable of managing a heat source used in data storage applications. Various embodiments of the present invention are generally directed to a heat source directed at a data storage medium with a synchronization signal and a serial interface that are each selectively activated via a demultiplexed write gate signal. The selective activation allows for pulsed operation of the heat source resulting in reduced duty cycle and temperature during a write operation.
    Type: Grant
    Filed: March 25, 2011
    Date of Patent: September 17, 2013
    Assignee: Seagate Technology LLC
    Inventors: Michael Henry Lennard, Robert Matousek
  • Compensation for vibration in a data storage system
    Patent number: 8537485
    Abstract: A plurality of sensors are used to sense disturbances in a data storage system. An adaptive gain component is associated with each of the sensors and provides a gain for each of the sensor signals. The gain of each sensor signal is adapted, individually, based on a correlation of each given sensor signal to the position error signal. This adaptation produces a position correction signal. The position correction signal is applied to a position signal that is used to position the reading and writing components and the storage medium relative to one another. This compensates for both rotary and linear vibration disturbances at the same time.
    Type: Grant
    Filed: June 30, 2011
    Date of Patent: September 17, 2013
    Assignee: Seagate Technology LLC
    Inventors: Jeffrey Vincent DeRosa, Bin Huang, Chiyun Xia, John Lowell Zeller, Peng Yan
  • Staggered magnetic tunnel junction
    Patent number: 8537607
    Abstract: A staggered magnetic tunnel junction includes a free magnetic layer extending in a lateral direction between a first end portion and an opposing second end portion and a tunneling barrier disposed between a reference magnetic layer and the first end portion and forming a magnetic tunnel junction. Current flows through the free magnetic layer in the lateral direction to switch the magnetic tunnel junction between a high resistance state and a low resistance state.
    Type: Grant
    Filed: May 22, 2012
    Date of Patent: September 17, 2013
    Assignee: Seagate Technology LLC
    Inventor: Xiaohua Lou
  • Dual stage sensing for non-volatile memory
    Patent number: 8537587
    Abstract: A method and apparatus for accessing a non-volatile memory cell. In some embodiments, a memory block provides a plurality of memory cells arranged into rows and columns. A read circuit is configured to read a selected row of the memory block by concurrently applying a control voltage to each memory cell along the selected row and, for each column, using a respective local sense amplifier and a column sense amplifier to successively differentiate a voltage across the associated memory cell in said column to output a programmed content of the row.
    Type: Grant
    Filed: September 23, 2011
    Date of Patent: September 17, 2013
    Assignee: Seagate Technology LLC
    Inventors: Hai Li, Yiran Chen, Yuan Yan, Brian Lee, Ran Wang
  • Apparatus for fluid recirculation
    Patent number: 8534919
    Abstract: A system, method and means is provided for withstanding mechanical shock for use with fluid dynamic bearings. A sealing system is provided that withstands 1000 G shock events. In an aspect, a grooved pumping seal employed between a thrust plate and a shield, a thrust plate having spiral grooves, a fluid recirculation passageway, and a reservoir creates an asymmetric pressure gradient. In an aspect, fluid is retained and air is purged utilizing an enlarged fluid reservoir, axial channels and an angled fill hole. In an aspect, a shaft is attached to a top cover supplying radial stiffness, and an enlarged single-sided thrust plate improves dynamic parallelism.
    Type: Grant
    Filed: September 15, 2012
    Date of Patent: September 17, 2013
    Assignee: Seagate Technology LLC
    Inventors: Lynn Bich-Quy Le, Alan Lyndon Grantz
  • HAMR NFT MATERIALS WITH IMPROVED THERMAL STABILITY
    Publication number: 20130235707
    Abstract: A near field transducer includes gold and at least one dopant. The dopant can include at least one of: Cu, Rh, Ru, Ag, Ta, Cr, Al, Zr, V, Pd, Ir, Co, W, Ti, Mg, Fe, or Mo. The dopant concentration may be in a range from 0.5% and 30%. The dopant can be a nanoparticle oxide of V, Zr, Mg, Ca, Al, Ti, Si, Ce, Y, Ta, W, or Th, or a nitride of Ta, Al, Ti, Si, In, Fe, Zr, Cu, W or B.
    Type: Application
    Filed: April 22, 2013
    Publication date: September 12, 2013
    Applicant: SEAGATE TECHNOLOGY LLC
    Inventors: Tong Zhao, Michael Christopher Kautzky, William Albert Challener, Michael Allen Seigler
  • MAGNETIC SENSOR WITH COMPOSITE MAGNETIC SHIELD
    Publication number: 20130233823
    Abstract: A magneto-resistive reader includes a first magnetic shield element, a second magnetic shield element and a magneto-resistive sensor stack separating the first magnetic shield element from the second magnetic shield element. The first shield element includes two ferromagnetic anisotropic layers separated by a grain growth suppression layer.
    Type: Application
    Filed: April 23, 2013
    Publication date: September 12, 2013
    Applicant: SEAGATE TECHNOLOGY LLC
    Inventors: Vladyslav Alexandrovich Vas'ko, Venkateswara Rao Inturi, Michael C. Kautzky, Zhihong Lu, Mark T. Kief, Yifan Zhang
  • SEAL-TYPE LABEL TO CONTAIN PRESSURIZED GAS ENVIRONMENT
    Publication number: 20130235488
    Abstract: In accordance with certain embodiments, a housing includes a first housing component having a through hole covered by a first seal at one end of the through hole. The housing also includes a second seal that covers the first seal. In accordance with certain embodiments, a housing maintains a low density gas. The housing includes a fastening means for attaching a cover to a base, a first sealing means for sealing a through hole in the housing, and a second sealing means for inhibiting diffusion of the low-density gas through the first sealing means.
    Type: Application
    Filed: April 19, 2013
    Publication date: September 12, 2013
    Applicant: Seagate Technology LLC
    Inventors: Thomas G. Andrikowich, Michael C. Strzepa
  • DYNAMIC STORAGE PARAMETER TRACKING
    Publication number: 20130238834
    Abstract: A method or system comprising iteratively updating a value of an operating parameter of a storage region of a storage device based on dynamic characterization of the storage region during operation of the storage device and using the updated value of the operating parameter during access to the storage region.
    Type: Application
    Filed: March 12, 2012
    Publication date: September 12, 2013
    Applicant: SEAGATE TECHNOLOGY LLC
    Inventors: Timothy Richard Feldman, Jonathan Williams Haines, James Joseph Touchton
  • Semiconductor laser with test pads
    Patent number: 8532156
    Abstract: A laser diode includes a junction surface configured to interface with an integrated optics slider. Cathode and anode electrical junctions are disposed on the junction surface. The cathode and anode electrical junctions are configured for electrical and mechanical coupling to the integrated optics slider. At least one test pad is disposed on the junction surface that is physically separate from and electrically coupled to one of the cathode and anode electrical junctions. The test pad is configured to be contacted by a test probe and is not configured for electrical or mechanical coupling to the integrated optics slider.
    Type: Grant
    Filed: September 13, 2011
    Date of Patent: September 10, 2013
    Assignee: Seagate Technology LLC
    Inventor: Scott Olson
  • Unipolar spin-transfer switching memory unit
    Patent number: 8531876
    Abstract: A memory unit includes a magnetic tunnel junction data cell electrically coupled to a bit line and a word line. The magnetic tunnel junction data cell is configured to switch between a high resistance state and a low resistance state by passing a unipolar voltage across the magnetic tunnel junction data cell. A diode is electrically coupled between the magnetic tunnel junction data cell and the word line or bit line. A voltage source provides the unipolar voltage across the magnetic tunnel junction data cell that writes the high resistance state and the low resistance state.
    Type: Grant
    Filed: June 20, 2012
    Date of Patent: September 10, 2013
    Assignee: Seagate Technology LLC
    Inventors: Xiaohua Lou, Haiwen Xi
  • Head gimbal assembly with contact detection
    Patent number: 8531799
    Abstract: An apparatus and associated method for a head gimbal assembly (HGA) that detects a contact event. Various embodiments of the present invention are generally directed to a load beam coupled to a plate via a gimbal. The plate has a cantilevered ramp limiter which extends forward from the gimbal to engage a ramp load/unload structure. A slider is affixed to a lower surface of the plate opposite the gimbal while a strain gage is affixed to the ramp limiter.
    Type: Grant
    Filed: October 22, 2009
    Date of Patent: September 10, 2013
    Assignee: Seagate Technology LLC
    Inventor: Michael Allen Greminger
  • Capping method for laser diode protection
    Patent number: 8532157
    Abstract: A method includes: positioning a laser in the cavity in an end of a slider, wherein the laser has an output facet positioned adjacent to a first wall of the cavity to define a first gap between the output facet and the first wall of the cavity, and filling at least a portion of the first gap adjacent to the output facet. An apparatus including a slider including a cavity in a trailing end of the slider, a laser positioned in the cavity and having an output facet positioned adjacent to a first wall of the cavity to define a first gap between the output facet and the first wall of the cavity, and a sealing material filling at least a portion of the first gap adjacent to the output facet is also provided.
    Type: Grant
    Filed: February 22, 2011
    Date of Patent: September 10, 2013
    Assignee: Seagate Technology LLC
    Inventors: Douglas Cole, Lijuan Zhong, Roger Lee Hipwell, Jr., Joseph Michael Stephan, Scott Eugene Olson, Tanya Jegeris Snyder, Yongjun Zhao
  • Magnetic structure free layer stabilization
    Patent number: 8531802
    Abstract: A magnetic layered structure is presently disclosed comprising a pinned layer, a first anti-ferromagnetic layer that defines a magnetic orientation of the pinned layer, a free layer, a second anti-ferromagnetic layer that biases the free layer to a magnetic orientation approximately perpendicular to the magnetic orientation of the pinned layer, and a tuning layer positioned between and in contact with the second anti-ferromagnetic layer and the free layer that tunes free layer bias to a desired level.
    Type: Grant
    Filed: December 17, 2010
    Date of Patent: September 10, 2013
    Assignee: Seagate Technology LLC
    Inventors: Antonia Tsoukatos, Eric Walter Singleton
  • PROGRAMMABLE RESISTIVE MEMORY CELL WITH SACRIFICIAL METAL
    Publication number: 20130228734
    Abstract: Programmable metallization memory cells include an electrochemically active electrode and an inert electrode and an ion conductor solid electrolyte material between the electrochemically active electrode and the inert electrode. A sacrificial metal is disposed between the electrochemically active electrode and the inert electrode.
    Type: Application
    Filed: April 17, 2013
    Publication date: September 5, 2013
    Applicant: SEAGATE TECHNOLOGY LLC
    Inventors: Venkatram Venkatasamy, Ming Sun, Dadi Setiadi
  • LIGHT DELIVERY WAVEGUIDE
    Publication number: 20130230279
    Abstract: A light source and a waveguide are mounted on a recording head slider. Light rays are emitted from the light source into the waveguide. The waveguide may include two core layers for light ray transmission. The first core layer enhances light coupling efficiency from the light source to the second core layer. The second core layer transforms a profile of the light. The waveguide may include a tapered portion with a narrow opening near the light source and a wider opening near the tapered portion exit. The light rays passing through the waveguide may be directed toward a collimating mirror. The collimating mirror makes the light rays parallel or nearly parallel and re-directs the light rays to a focusing mirror. The focusing mirror focuses the collimated light rays to a spot on a magnetic media disc.
    Type: Application
    Filed: February 22, 2013
    Publication date: September 5, 2013
    Applicant: SEAGATE TECHNOLOGY LLC
    Inventors: Chubing Peng, Edward Charles Gage, Kalman Pelhos
  • MAGNETIC STACK HAVING ASSIST LAYERS
    Publication number: 20130228884
    Abstract: A magnetic tunnel junction having a ferromagnetic free layer and a ferromagnetic pinned reference layer, each having an out-of-plane magnetic anisotropy and an out-of-plane magnetization orientation, the ferromagnetic free layer switchable by spin torque. The magnetic tunnel junction includes a ferromagnetic assist layer proximate the free layer, the assist layer having a low magnetic anisotropy less than 700 Oe and positioned to apply a magnetic field on the free layer.
    Type: Application
    Filed: April 5, 2013
    Publication date: September 5, 2013
    Applicant: SEAGATE TECHNOLOGY LLC
    Inventors: Yuankai Zheng, Zheng Gao, Wonjoon Jung, Xuebing Feng, Xiaohue Lou, Haiwen Xi
  • Transfer Command with Specified Sense Threshold Vector Component
    Publication number: 20130232291
    Abstract: Various embodiments of the present disclosure are generally directed to the accessing of data in a memory, such as but not limited to a flash memory array. In accordance with some embodiments, a transfer command is received to transfer selected data between a control module and a memory module. The transfer command specifies a target address in the memory module and a sense threshold vector associated with the selected data. The sense threshold vector in the received transfer command is used to sense a programmed state of at least one solid-state memory cell at the target address responsive to the received transfer command. The transfer command may be a read or write command.
    Type: Application
    Filed: March 1, 2012
    Publication date: September 5, 2013
    Applicant: SEAGATE TECHNOLOGY LLC
    Inventors: Ara Patapoutian, Bernie Rub
  • Compound cell spin-torque magnetic random access memory
    Patent number: 8526224
    Abstract: A compound magnetic data storage cell, applicable to spin-torque random access memory (ST-RAM), is disclosed. A magnetic data storage cell includes a magnetic storage element and two terminals communicatively connected to the magnetic storage element. The magnetic storage element is configured to yield any of at least three distinct magnetoresistance output levels, corresponding to stable magnetic configurations, in response to spin-momentum transfer inputs via the terminals.
    Type: Grant
    Filed: October 29, 2012
    Date of Patent: September 3, 2013
    Assignee: Seagate Technology LLC
    Inventors: Thomas William Clinton, Werner Scholz
  • Reverse flow preventer unit
    Patent number: 8526140
    Abstract: Disclosed are a slider for a memory device and a memory device having the same. The slider for a memory device includes a slider body configured to fly over the surface of a medium at a particular height; and a reverse flow preventing unit disposed at part of the slider body adjacent to a trailing edge of the slider body and configured to prevent a reverse flow of air between the medium and the slider body.
    Type: Grant
    Filed: March 30, 2012
    Date of Patent: September 3, 2013
    Assignee: Seagate Technology LLC
    Inventor: Hyun Ki Kim