Patents Examined by Jefferson Evans
  • Patent number: 10497384
    Abstract: A magnetic tape device includes a magnetic tape; and a Tunneling Magnetoresistive (PAR) head as a reproducing head, in which the center line average surface roughness Ra measured regarding a surface of the magnetic layer of the magnetic tape is equal to or smaller than 2.0 nm, the logarithmic decrement acquired by a pendulum viscoelasticity test performed regarding the surface of the magnetic layer is equal to or smaller than 0.050, and ?SFD in a longitudinal direction of the magnetic tape calculated by Expression 1: ?SFD=SFD25° C.?SFD?190° C. is equal to or smaller than 0.50, wherein, in Expression 1, the SFD25° C. is a switching field distribution SFD measured in a longitudinal direction of the magnetic tape at a temperature of 25° C., and the SFD?190° C. is a switching field distribution SFD measured in a longitudinal direction of the magnetic tape at a temperature of ?190° C.
    Type: Grant
    Filed: February 20, 2018
    Date of Patent: December 3, 2019
    Assignee: FUJIFILM Corporation
    Inventors: Norihito Kasada, Eiki Ozawa
  • Patent number: 10490211
    Abstract: Provided are a tape head module, tape drive, and method for moving a tape medium over a tape head having a recessed portion to provide air bearing between a tape medium and a tape bearing surface of the module. The tape head includes a tape bearing surface, an array of transducers, including read and/or write transducers, on the tape bearing surface, and a recessed portion formed on the tape bearing surface, wherein the array of transducers is located on the tape bearing surface between the recessed portion and an end of the module to perform read and/or write operations with respect to the tape medium.
    Type: Grant
    Filed: March 16, 2018
    Date of Patent: November 26, 2019
    Assignee: INTERNATIONAL BUSINESS MACHINES CORPORATION
    Inventors: Robert G. Biskeborn, Calvin S. Lo
  • Patent number: 10466315
    Abstract: A magnetic field detection device includes a Z-direction detection unit with magnetoresistive elements provided on inclined side surfaces of Z-direction detection recesses; an X-direction detection unit includes magnetoresistive elements provided on inclined side surfaces of X-direction detection recesses and a Y-detection unit includes magnetoresistive elements provided on inclined side surfaces of Y-direction detection recesses, each of the detection units having a bridge circuit comprising two element lines connected in parallel, each element line comprising two of the magnetoresistive elements connected in series.
    Type: Grant
    Filed: June 1, 2018
    Date of Patent: November 5, 2019
    Assignee: ALPS ALPINE CO., LTD.
    Inventor: Eiji Umetsu
  • Patent number: 10468954
    Abstract: A spindle motor includes a stationary unit and a rotating unit. The rotating unit is rotatable with respect to the stationary unit in a state in which the stationary unit is aligned with a central axis. The stationary unit includes a stator core and coils. The stator core includes a cylindrical core back and teeth units extending radially outward from an outer circumferential portion of the core back. The coils are defined by a conductive wire wound around each of the teeth units. The rotating unit includes a magnet located radially outside the teeth units. An axial length of the magnet is shorter than an axial length of the teeth unit. A first angle corresponding to a circumferential width of the teeth unit is smaller than a second angle corresponding to a circumferential gap between the adjacent teeth units.
    Type: Grant
    Filed: November 14, 2018
    Date of Patent: November 5, 2019
    Assignee: NIDEC CORPORATION
    Inventors: Kazuya Matsumura, Yoichi Sekii, Takuro Iguchi
  • Patent number: 10460756
    Abstract: A magnetic tape device includes: a magnetic tape including a servo pattern on a magnetic layer; and a Tunneling Magnetoresistive (TMR) head as a servo head, in which the center line average surface roughness Ra measured regarding a surface of the magnetic layer of the magnetic tape is equal to or smaller than 2.0 nm, the logarithmic decrement acquired by a pendulum viscoelasticity test performed regarding the surface of the magnetic layer is equal to or smaller than 0.050, and ?SFD in a longitudinal direction of the magnetic tape calculated by Expression 1: ?SFD=SFD25° C.?SFD?190° C. is equal to or smaller than 0.50, wherein the SFD25° C. is SFD measured in a longitudinal direction of the magnetic tape at a temperature of 25° C., and the SFD?190° C. is SFD measured in a longitudinal direction of the magnetic tape at a temperature of ?190° C.
    Type: Grant
    Filed: February 20, 2018
    Date of Patent: October 29, 2019
    Assignee: FUJIFILM Corporation
    Inventors: Norihito Kasada, Eiki Ozawa
  • Patent number: 10460752
    Abstract: A magnetic recording write head and system has a spin-torque oscillator (STO) located between the write head's write pole and trailing shield. The STO's ferromagnetic free layer is located near the write pole with a multilayer seed layer between the write pole and the free layer. The STO's nonmagnetic spacer layer is between the free layer and the STO's ferromagnetic polarizer. The polarizer may be the trailing shield of the write head or a separate polarizer layer. The STO electrical circuitry causes electron flow from the write pole to the trailing shield. The multilayer seed layer removes the spin polarization of electrons from the write pole, which enables electrons reflected from the polarizer layer to become spin polarized, which creates the spin transfer torque on the magnetization of the free layer. The multilayer seed layer includes Mn or a Mn-alloy layer between one or more metal or metal alloy films.
    Type: Grant
    Filed: May 10, 2018
    Date of Patent: October 29, 2019
    Assignee: WESTERN DIGITAL TECHNOLOGIES, INC.
    Inventors: James Mac Freitag, Zheng Gao, Masahiko Hashimoto, Sangmun Oh
  • Patent number: 10460750
    Abstract: A magnetic recording head having an air bearing surface (ABS) includes a main pole, a side shield laterally spaced from the main pole by a first side gap and a second side gap, an electrically conductive non-magnetic gap material layer disposed between the main pole and the side shield in the first side gap, and a dielectric non-magnetic gap material matrix and a conformal dielectric spacer layer disposed between the main pole and the side shield in the second side gap. The dual side gap recording head can improve on track performance on write gap peak field, on track performance on write field gradient, ATI off track performance, WATER reliability and can provide advantageous writer and side shield saturation properties.
    Type: Grant
    Filed: May 14, 2018
    Date of Patent: October 29, 2019
    Assignee: SanDisk Technologies LLC
    Inventors: Jinqiu Zhang, Ming Sun, Feng Liu, Xiaojun Zhang
  • Patent number: 10446176
    Abstract: A lateral spin valve reader includes a detector located proximate to a bearing surface of the reader, and a spin injector located away from the bearing surface. The lateral spin valve reader also includes a channel that extends from the detector to the spin injector. The channel includes a two-dimensional semiconducting layer that extends from the detector to the spin injector.
    Type: Grant
    Filed: February 21, 2018
    Date of Patent: October 15, 2019
    Assignee: SEAGATE TECHNOLOGY LLC
    Inventors: David A. Deen, Thomas Roy Boonstra
  • Patent number: 10446181
    Abstract: A transducing head having a media-facing surface includes a transducer element, a bottom shield positioned below the transducer element, a heater element positioned below the bottom shield, a heat transfer block positioned below the heater element, and a push block assembly. A first portion of the push block assembly is positioned below a bottom edge of the bottom shield, and a second portion of the push block assembly is located behind the bottom shield relative to the media-facing surface of the transducing head and extends above the bottom edge of the bottom shield, with the first and second portions of the push block assembly spaced from each other. The second portion of the push block assembly overlaps the heater element, and the heater element is positioned between the heat transfer block and at least the second portion of the push block assembly.
    Type: Grant
    Filed: February 21, 2018
    Date of Patent: October 15, 2019
    Assignee: SEAGATE TECHNOLOGY LLC
    Inventor: Erik J. Hutchinson
  • Patent number: 10446175
    Abstract: A spin transfer torque (STT) device is formed on an electrically conductive substrate and includes a ferromagnetic free layer near the substrate, a ferromagnetic polarizing layer and a nonmagnetic spacer layer between the free layer and the polarizing layer. A multilayer structure is located between the substrate and the free layer. The multilayer structure includes a metal or metal alloy seed layer for the free layer and an intermediate oxide layer below and in contact with the seed layer. The intermediate oxide layer reflects spin current from the free layer and thus reduces undesirable damping of the oscillation of the free layer's magnetization by the seed layer.
    Type: Grant
    Filed: May 16, 2017
    Date of Patent: October 15, 2019
    Assignee: WESTERN DIGITAL TECHNOLOGIES, INC.
    Inventors: James Mac Freitag, Susumu Okamura, Masahiko Hashimoto, Zheng Gao
  • Patent number: 10446178
    Abstract: A microwave assisted magnetic recording (MAMR) writer has a recessed spin flipping element formed in the write gap between the MP tapered trailing side and a first trailing shield, a thickness ? to the write gap thickness, and a width ? to a maximum width of the MP tapered trailing side. The spin flipping element has a lower non-spin preserving layer, a middle flux guiding layer (FGL), and an upper spin preserving layer. The FGL has a magnetization that flips to a direction substantially anti-parallel to the write gap field when a current of sufficient magnitude is applied from the trailing shield towards the MP thereby increasing reluctance in the write gap and forcing additional flux out of the MP at the air bearing surface to enhance writability and tracks per inch capability on a recording medium while maintaining bits per inch capability compared with conventional MAMR writers.
    Type: Grant
    Filed: November 14, 2018
    Date of Patent: October 15, 2019
    Assignee: Headway Technologies, Inc.
    Inventors: Yuhui Tang, Ying Liu
  • Patent number: 10438628
    Abstract: The magnetic tape device includes: a magnetic tape; and a reproducing head, in which a magnetic tape transportation speed of the magnetic tape device is equal to or lower than 18 m/sec, the reproducing head is a magnetic head including a tunnel magnetoresistance effect type element as a reproducing element, the magnetic tape includes a non-magnetic support, and a magnetic layer including ferromagnetic powder and a binding agent on the non-magnetic support, the magnetic layer includes one or more components selected from the group consisting of fatty acid and fatty acid amide, and a C—H derived C concentration calculated from a C—H peak area ratio of C1s spectra obtained by X-ray photoelectron spectroscopic analysis performed on the surface of the magnetic layer at a photoelectron take-off angle of 10 degrees is 45 to 65 atom %.
    Type: Grant
    Filed: December 26, 2017
    Date of Patent: October 8, 2019
    Assignee: FUJIFILM Corporation
    Inventors: Norihito Kasada, Eiki Ozawa, Tetsuya Kaneko
  • Patent number: 10438618
    Abstract: According to one embodiment, a magnetic head includes a magnetic pole, a first shield, and a stacked body provided between the magnetic pole and the first shield. The stacked body includes a first layer, the first layer being nonmagnetic, a second layer provided between the first layer and the first shield, the second layer being nonmagnetic, and a third layer contacting the first layer and the second layer, being provided between the first layer and the second layer, and being electrically connected to the first layer and the second layer. The third layer includes a first magnetic region, and a second magnetic region contacting the first magnetic region and being provided between the first magnetic region and the second layer. A second saturation magnetization of the second magnetic region is higher than a first saturation magnetization of the first magnetic region.
    Type: Grant
    Filed: March 6, 2018
    Date of Patent: October 8, 2019
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Naoyuki Narita, Tomoyuki Maeda
  • Patent number: 10431245
    Abstract: A piezoelectric element easily and surely forms polymer coatings on peripheral end faces of the piezoelectric element without deteriorating a yield of the piezoelectric element. The piezoelectric element is manufactured by a method including steps of cutting a piezoelectric element out from a base piezoelectric material plate so that peripheral end faces are formed to define a peripheral shape of the piezoelectric element, and forming polymer coatings on at least objective areas of the peripheral end faces of the piezoelectric element by vapor deposition polymerization.
    Type: Grant
    Filed: March 16, 2016
    Date of Patent: October 1, 2019
    Assignee: NHK Spring Co., Ltd.
    Inventor: Akira Nojima
  • Patent number: 10423334
    Abstract: Embodiments for predetermining optimal demount position for demounting data storage cartridges in an automated data storage library by a processor. A selected demount position may be predetermined, while performing one of a plurality of robotic movements by an accessor, for each mounted data storage cartridge for demounting data storage cartridges in the automated data storage library such that each predetermined selected demount position is stored in a lookup table of predetermined selected demount positions for a subsequent demount operation. The idle time of the accessor during a demount operation may be reduced.
    Type: Grant
    Filed: January 3, 2017
    Date of Patent: September 24, 2019
    Assignee: INTERNATIONAL BUSINESS MACHINES CORPORATION
    Inventors: Illarion Borisevich, Shawn M. Nave, Khanh V. Ngo, Timothy K. Pierce
  • Patent number: 10418054
    Abstract: A dual PMR writer is disclosed wherein a first main pole (MP1) in writer 1 is a mirror image of a second main pole (MP2) in writer 2 with respect to a center plane aligned orthogonal to the air bearing surface (ABS). MP1 and MP2 may have an asymmetrical top-down shape to reduce writer-writer spacing (WWS) and read write offset (RWO) when a single or double reader is positioned down-track at the center plane. Accordingly, there is less track misregistration and better area density capability. Each of MP1 and MP2 as well as a top yoke (TY), and a tapered bottom yoke (tBY) have a rectangular back portion of width “w” from 4 to 10 microns. Spacing between MP1 and MP2 back portions may be ?4 microns to prevent cross-talk. RWO is reduced from ?4 microns for symmetrical TY/MP/tBY shapes to 3 microns or less for asymmetrical shapes.
    Type: Grant
    Filed: March 6, 2018
    Date of Patent: September 17, 2019
    Assignee: Headway Technologies, Inc.
    Inventor: Yue Liu
  • Patent number: 10407775
    Abstract: A base plate is arranged to define a portion of a housing of a hard disk drive, and includes a base body defined by casting, and an electrodeposition coating film arranged to cover a surface of the base body. The surface of the base body includes a coated surface covered with the electrodeposition coating film, and a flat worked surface exposed from the electrodeposition coating film. The worked surface may include a gate position to which a gate has been connected at the time of the casting. At least a portion of the worked surface is covered with an impregnant.
    Type: Grant
    Filed: January 25, 2018
    Date of Patent: September 10, 2019
    Assignee: NIDEC CORPORATION
    Inventors: Kunio Sakurada, Tomohiro Yoneda
  • Patent number: 10403322
    Abstract: The present description is directed to moving a car within a shuttle connection that connects a first library string and a second library string contained in a shuttle complex. The shuttle complex determines a first library string data chunk count of a first library string, determines a second library string data chunk count of a second library string, and moves the car within the shuttle connection to the first library string if the first library string data chunk count is greater than the second library string data chunk count. A library string data chunk count is generally the sum of respective cartridge data chunk counts of each cartridge located within the library string. The library string data chunk count may be updated after a data chunk write to a cartridge located within the library string, may be updated after a cartridge is moved from the library string, and may be updated after a cartridge is moved to the library string.
    Type: Grant
    Filed: November 22, 2016
    Date of Patent: September 3, 2019
    Assignee: International Business Machines Corporation
    Inventors: Tohru Hasegawa, Yuhko Hasegawa
  • Patent number: 10395679
    Abstract: A data storage system can employ at least one transducing head that is suspended above a data storage medium to access data. The transducing head suspension can be configured with a resonance system where a gimbal flexure is mounted to a load beam via a physical connection. The gimbal flexure may support a transducing head and contact the load beam via the physical connection, a dimple, and a first contact feature concurrently while the physical connection, dimple, and first contact feature are each separate and different points of physical contact.
    Type: Grant
    Filed: December 8, 2017
    Date of Patent: August 27, 2019
    Assignee: Seagate Technology LLC
    Inventors: Ravishankar Ajjanagadde Shivarama, Bradley J. Ver Meer, Razman Zambri
  • Patent number: 10381032
    Abstract: Magnetic sensors with effectively shaped side shields and their fabrication processes are provided. One such sensor includes a substrate, a sensor stack disposed on the substrate and having a stripe height, where the sensor stack further includes a front edge disposed at an air bearing surface (ABS) of the magnetic sensor, a back edge opposite of the front edge, and two side edges, and a side shield adjacent to each of the two side edges of the sensor stack, each side shield having a side shield height defined as a distance from the ABS to a back edge of the side shields, where the side shield height is greater than the stripe height, and where substantially no residue from materials used to form the side shield are disposed at the back edge of the sensor stack.
    Type: Grant
    Filed: January 12, 2018
    Date of Patent: August 13, 2019
    Assignee: WESTERN DIGITAL TECHNOLOGIES, INC.
    Inventors: Quang Le, Yongchul Ahn, Xiaoyong Liu, Jui-Lung Li, Hongquan Jiang