Head Patents (Class 360/110)
  • Patent number: 10978636
    Abstract: According to one embodiment, a storage device includes a magnetoresistive effect element comprising a nonmagnetic layer and a stacked body on the nonmagnetic layer. The stacked body includes a first ferromagnetic layer on the nonmagnetic layer, a second ferromagnetic layer exchange-coupled with the first ferromagnetic layer, and a magnetic layer between the first ferromagnetic layer and the second ferromagnetic layer. The magnetic layer includes a magnetic material and at least one compound selected from among a carbide, a nitride, and a boride.
    Type: Grant
    Filed: March 1, 2019
    Date of Patent: April 13, 2021
    Assignee: TOSHIBA MEMORY CORPORATION
    Inventors: Takeshi Iwasaki, Akiyuki Murayama, Tadashi Kai, Tadaomi Daibou, Masaki Endo, Shumpei Omine, Taichi Igarashi, Junichi Ito
  • Patent number: 10901558
    Abstract: A capacitive touch-sensing device includes a substrate and a plurality of configurable resonant circuits. Each configurable resonant circuit includes at least one respective touch capacitor electrode and at least one inductor. The electrodes of the plurality of resonant circuits are distributed on the substrate, and the at least one inductor is a thin film inductor.
    Type: Grant
    Filed: June 21, 2018
    Date of Patent: January 26, 2021
    Assignee: International Business Machines Corporation
    Inventor: Bahman Hekmatshoartabari
  • Patent number: 10891977
    Abstract: A microwave assisted magnetic recording (MAMR) write head includes a main pole and a trailing shield. A spin torque oscillator device is disposed between the main pole and the trailing shield. The spin torque oscillator device includes a free layer. A trailing shield hot seed layer is disposed between the spin torque oscillator device and the trailing shield. The trailing shield hot seed layer includes a magnetic material doped with a rare earth element. In certain embodiments, the trailing shield hot seed layer includes the rare earth element in an atomic percent content from about 2% to about 10% atomic percent. In certain embodiments, the trailing shield hot seed layer has an intrinsic damping from about 0.02 to about 0.2.
    Type: Grant
    Filed: July 8, 2020
    Date of Patent: January 12, 2021
    Assignee: WESTERN DIGITAL TECHNOLOGIES, INC.
    Inventors: Alexander Goncharov, Muhammad Asif Bashir, Petrus Antonius Van Der Heijden
  • Patent number: 10867796
    Abstract: A method of forming a pattern includes forming a lower layer on a substrate, forming a mask pattern on the lower layer, the mask pattern extending in a first direction parallel to a top surface of the substrate, and performing an etching process using an ion beam on the substrate, such that the ion beam is irradiated in parallel to a plane defined by the first direction and a direction perpendicular to the top surface of the substrate, and is irradiated at a tilt angle with respect to the top surface of the substrate, wherein performing the etching process includes adjusting the tilt angle of the ion beam to selectively etch the lower layer or the mask pattern.
    Type: Grant
    Filed: July 17, 2019
    Date of Patent: December 15, 2020
    Assignee: SAMSUNG ELECTRONICS CO., LTD.
    Inventor: Jongchul Park
  • Patent number: 10832706
    Abstract: In one embodiment, an apparatus includes a module having an array of transducers, and a heating element having multiple parts positioned proximate to the array of transducers. The multiple parts of the heating element are distinct from each other, where the multiple parts include a first part, a second part, and a third part. In addition, the first part includes a center portion and the second and third parts include a second portion and a third portion, respectively, and are positioned on opposite ends and a center portion positioned therebetween. The heating element is configured to produce more heat per unit length along the second and third portions at the opposite ends than in the center portion.
    Type: Grant
    Filed: January 3, 2020
    Date of Patent: November 10, 2020
    Assignee: International Business Machines Corporation
    Inventors: Robert G. Biskeborn, Hugo E. Rothuizen
  • Patent number: 10692520
    Abstract: In one embodiment, an apparatus includes a module having an array of transducers, and a heating element having multiple parts positioned proximate to the array of transducers. The multiple parts of the heating element are distinct from each other, where the multiple parts include a first part, a second part, and a third part. In addition, the first part includes a center portion and the second and third parts include a second portion and a third portion, respectively, and are positioned on opposite ends and a center portion positioned therebetween. The heating element is configured to produce more heat per unit length along the second and third portions at the opposite ends than in the center portion.
    Type: Grant
    Filed: January 3, 2020
    Date of Patent: June 23, 2020
    Assignee: International Business Machines Corporation
    Inventors: Robert G. Biskeborn, Hugo E. Rothuizen
  • Patent number: 10665263
    Abstract: A data storage device is disclosed comprising a first head actuated over a first disk surface, wherein the first head comprises a write coil and a write-assist component. First data is written to the first disk surface using the write coil and the write-assist component of the first head. An electrical bias is applied to the write-assist component of the first head to physically damage the write-assist component, thereby rendering the first disk surface read-only.
    Type: Grant
    Filed: February 10, 2019
    Date of Patent: May 26, 2020
    Assignee: Western Digital Technologies, Inc.
    Inventors: Shaomin Xiong, Toshiki Hirano, Na Wang, William B. Boyle
  • 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: 10424322
    Abstract: This magnetic head, which reads and writes magnetic information, prevents a signal from being read between the magnetic head and the write circuit during reading of magnetic information. A card reader 1 is provided with a magnetic head 6 which reads and writes magnetic information. Bidirectional diodes 54A, 54B are arranged inside of a head case 21 of the magnetic head 6. A write signal from a write circuit 72 is inputted via the bidirectional diodes 54A, 54B to a writing coil 34 wound around a core 32 of the magnetic head 6. The bidirectional diodes 54A, 54B and a demodulation IC 61 are mounted on a first board surface 62A of a control circuit board 62, and the control circuit board 62 is fixed to the head case 21 so that the bidirectional diodes 54A, 54B and the demodulation IC 61 are covered by the head case 21.
    Type: Grant
    Filed: March 8, 2017
    Date of Patent: September 24, 2019
    Assignee: NIDEC SANKYO CORPORATION
    Inventors: Katsuhisa Higashi, Yohei Shimizu
  • Patent number: 10416000
    Abstract: A magnetoresistive element is provided with a plurality of magnetoresistive laminated bodies arranged in an array and a plurality of lead electrodes that electrically connect the plurality of magnetoresistive laminated bodies in series. A first lead electrode electrically connected to a first surface in the lamination direction of a first magnetoresistive laminated body among the plurality of magnetoresistive laminated bodies and a second lead electrode electrically connected to a first surface in the lamination direction of a second magnetoresistive laminated body adjacent in the series direction are electrically connected without a magnetoresistive laminated body being interposed in between.
    Type: Grant
    Filed: July 18, 2017
    Date of Patent: September 17, 2019
    Assignee: TDK Corporation
    Inventor: Naoki Ohta
  • Patent number: 10193057
    Abstract: A magnetic memory device includes a stacked structure including a magnetic element, a protective insulating film covering the stacked structure, and an interface layer provided at an interface between the stacked structure and the protective insulating film. The interface layer contains a predetermined element which is not contained in the magnetic element or the protective insulating film.
    Type: Grant
    Filed: January 6, 2017
    Date of Patent: January 29, 2019
    Assignee: TOSHIBA MEMORY CORPORATION
    Inventors: Masatoshi Yoshikawa, Hiroaki Yoda, Shuichi Tsubata, Kenji Noma, Tatsuya Kishi, Satoshi Seto, Kazuhiro Tomioka
  • Patent number: 9886976
    Abstract: Disclosed herein is a hard disk drive slider having an extended three-dimensional air-bearing surface (ABS). The slider has an ABS and a back surface opposite the ABS, where at least a portion of the back surface defines a plane (i.e., if the back surface is substantially flat, the back surface itself defines the plane). Defined herein is an ABS function, which describes the characteristics of a portion of the ABS in a two-dimensional plane made by taking a cross-section of the slider perpendicular to the plane defined by the at least a portion of the back surface. The cross-section of the slider taken perpendicular to the plane has an ABS function that is a multi-valued function, which is defined herein as a relation for which, for at least one possible input value along the selected axis in the plane, the relation evaluates to two or more distinct nonzero values.
    Type: Grant
    Filed: May 25, 2016
    Date of Patent: February 6, 2018
    Assignee: Western Digital Technologies, Inc.
    Inventor: Weidong Huang
  • Patent number: 9837239
    Abstract: Optimization techniques are disclosed for producing sharp and stable tips/nanotips relying on liquid Taylor cones created from electrically conductive materials with high melting points. A wire substrate of such a material with a preform end in the shape of a regular or concave cone, is first melted with a focused laser beam. Under the influence of a high positive potential, a Taylor cone in a liquid/molten state is formed at that end. The cone is then quenched upon cessation of the laser power, thus freezing the Taylor cone. The tip of the frozen Taylor cone is reheated by the laser to allow its precise localized melting and shaping. Tips thus obtained yield desirable end-forms suitable as electron field emission sources for a variety of applications. In-situ regeneration of the tip is readily accomplished. These tips can also be employed as regenerable bright ion sources using field ionization/desorption of introduced chemical species.
    Type: Grant
    Filed: November 28, 2016
    Date of Patent: December 5, 2017
    Inventor: Gregory Hirsch
  • Patent number: 9835692
    Abstract: A magnetic field component in a Z direction is guided by a magnetic field guide layer and applied to a magnetic sensor in an X direction that is the same as a sensitivity axis direction thereof, and a detection output is obtained. A bridge circuit is formed with a plurality of magnetic sensors and configured such that an output is not provided for a magnetic field component in the X direction. However, when an external magnetic field in the X direction is drawn to the magnetic field guide layer, variation of sensitivity for the X direction may occur. Thus, soft magnetic characteristics of a first portion of the magnetic field guide layer are deteriorated to decrease the magnetic permeability of the first portion.
    Type: Grant
    Filed: November 5, 2014
    Date of Patent: December 5, 2017
    Assignee: ALPS ELECTRIC CO., LTD.
    Inventors: Masayuki Obana, Hideto Ando, Tsutomu Takeya, Kazuaki Kaneko
  • Patent number: 9805746
    Abstract: A magnetic field-assisted magnetic recording (MAMR) head is provided, which includes a recording main pole, a seed layer, and a spin torque oscillator (STO) positioned over the main pole, in this order, in a stacking direction from a leading side to a trailing side of the recording head. The STO comprises a spin polarized layer (SPL), an interlayer with fcc structure, and a field generating layer (FGL), in this order in the stacking direction. The FGL comprises a low magnetic flux density interface (LMFDI) layer with bcc structure that directly contacts the interlayer.
    Type: Grant
    Filed: June 28, 2016
    Date of Patent: October 31, 2017
    Assignee: Western Digital Technologies, Inc.
    Inventors: Susumu Okamura, Masashige Sato, Keiichi Nagasaka, Yo Sato
  • Patent number: 9773513
    Abstract: A chromium oxide film is formed at room temperature. The chromium oxide film has at least one partially polycrystalline portion and/or at least one amorphous portion depending upon the substrate(s) over which the chromium oxide film is formed. Partially polycrystalline portion(s) of the chromium oxide film are exposed, at room temperature, to an electron beam that has an accelerating voltage of at least 100 kilovolts to further crystallize the partially polycrystalline portion(s). Amorphous portion(s) of the chromium oxide film are exposed, at room temperature, to an electron beam that has an accelerating voltage of more than 100 kilovolts to crystallize the amorphous portion(s).
    Type: Grant
    Filed: June 18, 2015
    Date of Patent: September 26, 2017
    Assignee: International Business Machines Corporation
    Inventors: Robert G. Biskeborn, Calvin S. Lo, Charles T. Rettner, Philip M. Rice, Teya Topuria, Kumar R. Virwani
  • Patent number: 9747930
    Abstract: In one general embodiment, an apparatus includes a magnetic tunnel junction device having a reference layer, a free layer, and a tunnel barrier layer between the free and reference layers. The tunnel barrier layer is primarily crystalline alumina. In another general embodiment, a method includes forming a first magnetic layer, forming a tunnel barrier layer above the first magnetic layer, and forming a second magnetic layer above the tunnel barrier layer. The tunnel barrier layer includes crystalline alumina. The tunnel barrier layer is formed at a temperature of less than 100 degrees centigrade.
    Type: Grant
    Filed: December 7, 2015
    Date of Patent: August 29, 2017
    Assignee: International Business Machines Corporation
    Inventors: Robert G. Biskeborn, Calvin S. Lo, Teya Topuria
  • Patent number: 9569121
    Abstract: Method and apparatus for managing a data storage system that utilizes heat assisted magnetic recording (HAMR). In some embodiments, the method includes recording data to a storage medium using the HAMR system, accumulating a usage statistic indicative of actual elapsed operation of the HAMR system, and setting an indication value in a memory indicative of an estimate of remaining available elapsed operation of the HAMR system. The estimate of remaining available elapsed operation is determined in relation to the usage statistic and an estimated total elapsed operation value.
    Type: Grant
    Filed: November 25, 2015
    Date of Patent: February 14, 2017
    Assignee: Seagate Technology LLC
    Inventors: Tim Rausch, Douglas Murphy, John W. Dykes, Jason Zimmerman, James C. Hatfield
  • Patent number: 9443648
    Abstract: A magnetic sheet of an embodiment includes a laminate of a plurality of magnetic thin plates. The laminate constituting the magnetic sheet includes a first magnetic thin plate and a second magnetic thin plate different in kind from the first magnetic thin plate. The first magnetic thin plate has a magnetostriction constant exceeding 5 ppm in an absolute value, and the second magnetic thin plate has a magnetostriction constant of 5 ppm or less in an absolute value. Alternatively, the first magnetic thin plate has a thickness of from 50 to 300 ?m, and the second magnetic thin plate has a thickness of from 10 to 30 ?m.
    Type: Grant
    Filed: May 7, 2014
    Date of Patent: September 13, 2016
    Assignees: KABUSHIKI KAISHA TOSHIBA, TOSHIBA MATERIALS CO., LTD.
    Inventors: Takao Sawa, Katsuhiko Yamada, Tadao Saito, Kiyoshi Nagasaki
  • Patent number: 9368133
    Abstract: A data writer may be configured with at least a write pole and a continuous coil with the continuous coil having a first turn with a first cross-sectional shape and a second turn with a second cross-sectional shape that differs from the first cross-sectional shape. The second turn may be positioned proximal a leading edge of the write pole and an air bearing surface while the first turn is positioned distal the air bearing surface.
    Type: Grant
    Filed: July 16, 2015
    Date of Patent: June 14, 2016
    Assignee: Seagate Technology LLC
    Inventors: Kirill Rivkin, Mourad Benakli, Huaqing Yin
  • Patent number: 9311945
    Abstract: Embodiments of the present invention generally relate to a MAMR head. The MAMR head includes an STO and an embedded contact sensor (ECS). The STO and the ECS are electrically connected in series and are connected to the same terminals. During operation, the current applied to the STO is controlled with respect to a change in resistance of the ECS.
    Type: Grant
    Filed: November 6, 2013
    Date of Patent: April 12, 2016
    Assignee: HGST NETHERLANDS B.V.
    Inventors: Kenichiro Takahashi, Junguo Xu, Jianhua Li, Masaru Furukawa
  • Patent number: 9280989
    Abstract: An apparatus having at least an air bearing surface (ABS), the apparatus including a near field transducer (NFT) positioned adjacent the ABS of the apparatus, wherein the NFT includes a plasmonic material; and not greater than about 200 ppm of one or more microalloy dopants.
    Type: Grant
    Filed: June 21, 2013
    Date of Patent: March 8, 2016
    Assignee: Seagate Technology LLC
    Inventors: Philip G. Pitcher, Sami C. Antrazi
  • Patent number: 9190094
    Abstract: Aspects of the present invention relate to a perpendicular magnetic recording (PMR) media stack and methods for fabricating the same. The PMR media stack has a novel grain isolation initiation layer (GIIL) and/or a novel exchange-break layer (EBL) that can improve the signal-to-noise performance of the PMR media stack. The PMR media stack includes a substrate, a soft underlayer on the substrate, an interlayer positioned on the soft underlayer, and a grain isolation initiation layer (GIIL) positioned on the interlayer, a magnetic layer positioned on the GIIL, and an exchange break layer (EBL) positioned on the magnetic layer. The GIIL and/or EBL includes a CoCrRu-oxide.
    Type: Grant
    Filed: June 6, 2013
    Date of Patent: November 17, 2015
    Assignee: Western Digital (Fremont)
    Inventors: Daehoon Hong, Sy Vu, Kyongha Kang, B. Ramamurthy Acharya
  • Patent number: 9165581
    Abstract: A thermally assisted magnetic recording head has a generator end surface facing an air bearing surface (ABS), and includes: a near-field light (NF light) generator that generates an NF light on the generator end surface and irradiates a magnetic recording medium with the NF light, and a main magnetic pole end surface positioned in the vicinity of the generator end surface; a main magnetic pole that emits a magnetic flux from the main magnetic pole end surface to the magnetic recording medium and a shield end surface positioned in the vicinity of the generator end surface; and a return shield that is magnetically linked to the main magnetic pole, and that absorbs the magnetic flux returning from the magnetic recording medium at the shield end surface.
    Type: Grant
    Filed: March 11, 2014
    Date of Patent: October 20, 2015
    Assignee: TDK Corporation
    Inventors: Susumu Aoki, Takafumi Kobayashi, Kei Hirata, Eiji Komura, Tsutomu Chou
  • Patent number: 9142226
    Abstract: An apparatus and associated method provides a magnetic writing element that may have at least a write pole tuned to a predetermined first grain size with a cryogenic substrate temperature. A magnetic shield can be formed with a predetermined second grain size that is tuned with the cryogenic substrate temperature.
    Type: Grant
    Filed: June 29, 2012
    Date of Patent: September 22, 2015
    Assignee: Seagate Technology LLC
    Inventors: Venkateswara Rao Inturi, Wei Tian, Huaqing Yin, Michael C. Kautzky, Mark Thomas Kief, Meng Zhu, Eliot Lewis Cuthbert Estrine
  • Patent number: 9099111
    Abstract: The present invention generally relates to a HAMR head. An insulating layer isolates the NFT from the magnetic lip of the magnetic pole. A noble metal alloy diffusion barrier layer is present between the insulating layer and the magnetic lip to prevent diffusion from the insulating layer into the magnetic lip. The noble metal alloy has a melting point of greater than about 1065 degrees Celsius, and the noble metals may be selected from Au, Pt, Ir, Re and Ru. The alloying elements comprise less than 10 percent of the alloy. The alloying elements can include Rh, W, Mo, Ni, Pt, Co, B, Ru and combinations thereof. The diffusion barrier layer may surround the magnetic lip, may surround the insulating layer, or may simply be at the interface of the insulating layer and the magnetic lip.
    Type: Grant
    Filed: December 18, 2013
    Date of Patent: August 4, 2015
    Assignee: HGST NETHERLANDS B.V.
    Inventors: Hamid Balamane, Vijay Prakash Singh Rawat, Matteo Staffaroni, Barry C. Stipe
  • Patent number: 9099110
    Abstract: Embodiments disclosed herein generally relate to a magnetic write head. The magnetic write head includes a write pole, a shield and a first coil disposed around the write pole. The magnetic write head further includes a magnetic circuit and the magnetic circuit includes a loop of magnetic material and a second coil disposed around the loop of magnetic material. The magnetic circuit magnetically resets the shield to improve far track interference.
    Type: Grant
    Filed: July 15, 2014
    Date of Patent: August 4, 2015
    Assignee: HGST NETHERLANDS, B.V.
    Inventors: Venkatesh Chembrolu, Wen-Chien David Hsiao, Quan-Chiu Harry Lam, Supradeep Narayana
  • Patent number: 9082427
    Abstract: A write head having reduced dimensions. In one implementation, the write head has a main pole having a leading side and a trailing side, a leading yoke on the leading side of the main pole, and a coil wrapped around the main pole and the leading yoke. The coil on the leading side and the leading yoke having a distance of no greater than 300 nm therebetween, and the coil on the trailing side and the main pole having a distance of no greater than 350 nm therebetween. In an alternate implementation, the write head has a trailing yoke, with the coil on the trailing side and the trailing yoke having a distance of no greater than 350 nm therebetween.
    Type: Grant
    Filed: September 25, 2014
    Date of Patent: July 14, 2015
    Assignee: SEAGATE TECHNOLOGY LLC
    Inventors: John M. Wolf, Jianhua Xue, Kevin Heim, Kirill Rivkin, Huaqing Yin
  • Patent number: 9067793
    Abstract: The present invention provides a method for producing a carbon nanotube having a high purity and a method for purifying an unpurified carbon nanotube or a carbon nanotube having a low purity. The method for producing a carbon nanotube comprises a step of providing a carbonaceous material containing a carbon nanotube and a step of adding an iron material and hydrogen peroxide to the carbonaceous material to thereby purity a carbon nanotube. It is preferred that an iron powder is used as the iron material. The iron powder is preferably used in a proportion of 0.5 to 20 parts by mass relative to 100 parts by mass of the whole carbonaceous material.
    Type: Grant
    Filed: September 6, 2011
    Date of Patent: June 30, 2015
    Assignee: Meijo University
    Inventors: Yoshinori Ando, Xinluo Zhao, Sakae Inoue
  • Patent number: 9069034
    Abstract: An apparatus, system, and method for phase detection of electromagnetic signals are presented. The apparatus may include a magnetic element, one or more first signal contacts coupled to the magnetic element for receiving a first signal, and one or more output contacts coupled to the magnetic element for providing a variable level voltage generated by the magnetic element, the level of the voltage being responsive to a phase difference between the first signal and a second signal. In a further embodiment, the apparatus may include a substrate for mechanically supporting the magnetic element. Additionally, the apparatus may include a conductor mechanically supported by substrate, the conductor configured to receive the second signal.
    Type: Grant
    Filed: June 17, 2011
    Date of Patent: June 30, 2015
    Assignee: University of Manitoba
    Inventors: Can-Ming Hu, Andre Wirthmann, Xiaolong Fan, Yongsheng Gui
  • Patent number: 9019658
    Abstract: Systems and methods that serve to limit the generation of stray magnetic fields by moving domain walls of magnetic shields of a magnetic head that would otherwise be received and interpreted as noise at the read sensor of the magnetic head. The utilities disclose use of first and second magnetic “closure” layers (e.g., soft magnetic layers) disposed about but spaced (i.e., magnetically isolated) from the first and second magnetic shields of the read portion of a magnetic head by first and second respective “closure” gaps (e.g., provided by any appropriate non-magnetic, high magnetic permeability material(s)). The closure layers create a magnetic environment for the shield edges that more closely resembles the interior of the shield, thereby minimizing or at least reducing the number of unstable edge domains and limiting subsequent domain wall movement.
    Type: Grant
    Filed: June 4, 2014
    Date of Patent: April 28, 2015
    Assignee: Oracle International Corporation
    Inventors: Terence Schemmel, Kevin McKinstry
  • Patent number: 9001462
    Abstract: A module according to one embodiment includes an array of N piggyback or merged first data transducers positioned towards a media facing surface of the module; and M second data transducers interleaved with the array of piggyback or merged data transducers, wherein the second data transducers are single data transducers, at least some of the data transducers being coupled to pads. A module according to another embodiment includes an array of N first data transducers positioned towards a media facing surface of the module, the first data transducers including at least one of data readers, data writers, and combinations thereof; and M second data transducers interleaved with the array of first data transducers, the second data transducers including at least one of data readers, data writers, and combinations thereof, wherein less than all of the first and/or second data transducers are coupled to pads.
    Type: Grant
    Filed: November 14, 2012
    Date of Patent: April 7, 2015
    Assignee: International Business Machines Corporation
    Inventors: Robert G. Biskeborn, Calvin S. Lo, Kevin T. Luong
  • Publication number: 20150055249
    Abstract: Systems and methods relating generally to sensing information, and more particularly to systems and methods for utilizing multiple readers to sense information.
    Type: Application
    Filed: September 16, 2013
    Publication date: February 26, 2015
    Applicant: LSI Corporation
    Inventor: Bruce A. Wilson
  • Patent number: 8953282
    Abstract: In a Spin Torque Oscillator (STO) comprising an underlayer, a first magnetic layer disposed on the underlayer, a non-magnetic intermediate layer disposed on the first magnetic layer, and a second magnetic layer disposed on the non-magnetic intermediate layer, the non-magnetic intermediate layer is a non-magnetic alloy containing 50 at % or more of at least one kind of element selected from a first group consisting of Cu, Ag, and Au, and further at least 0.1 at % or more in total of at least one kind of element selected from a second group consisting of Cu, Ag, Au, Cr, Ti, Zr, Hf, V, Nb, Ta, Ru, Os, Pd, Pt, Rh, and Ir that does not overlap with the element from the first group.
    Type: Grant
    Filed: August 6, 2013
    Date of Patent: February 10, 2015
    Assignee: Hitachi, Ltd.
    Inventors: Yoshihiro Shiroishi, Katsuro Watanabe, Yo Sato
  • Patent number: 8947807
    Abstract: A writer assembly having two separately driven write coils allows a combined write field generated by the writer assembly to be fine turned and optimized for a particular application. Two preamplifiers may be incorporated into a printed circuit board in order to separately drive the write coils. In other implementations, there may be more than two write coils and corresponding preamplifiers.
    Type: Grant
    Filed: December 20, 2012
    Date of Patent: February 3, 2015
    Assignee: Seagate Technology LLC
    Inventors: Kevin Richard Heim, Kirill A. Rivkin, Eric Meloche, John Wolf
  • Patent number: 8935132
    Abstract: A spectral simulation method during a noise testing for a magnetic head, includes steps of (a1) detecting several first noise profiles for several magnetic head samples under a first frequency bandwidth range by a dynamic testing machine; (b1) separating each first noise profile into at least two noise curves including a first noise curve and a second noise curve at a predetermined frequency bandwidth, wherein the first noise curve has a frequency bandwidth range lower than that of the second noise curve; (c1) fitting several mathematical equations according to the second noise curves; and (d1) establishing a correlative equation among the mathematical equations, so as to simulate the second noise curve for each magnetic head. The present invention can simulate a second noise curve of the noise profile in a higher frequency bandwidth and establishing the correlative equation according to the second noise curve.
    Type: Grant
    Filed: February 8, 2012
    Date of Patent: January 13, 2015
    Assignee: SAE Magnetics (H.K.) Ltd.
    Inventors: Hokei Lam, Cheukman Lui, Chiuming Lueng, Kaichiu Cheung, Wahchun Chan, Juren Ding, Rongkwang Ni
  • Publication number: 20140376127
    Abstract: A magnetic recording medium includes a substrate, a magnetic layer including a FePt alloy having a L10 type structure, and a plurality of underlayers arranged between the substrate and the magnetic layer, wherein at least one of the plurality of underlayers includes TiO2.
    Type: Application
    Filed: June 16, 2014
    Publication date: December 25, 2014
    Inventors: Tetsuya KANBE, Kazuya NIWA, Yuji MURAKAMI, Lei ZHANG
  • Patent number: 8913345
    Abstract: Systems and methods for reading data from a magnetic medium are provided. A system for reading data from a magnetic medium includes an electromagnetic head array, where the electromagnetic head array includes a plurality of read sensors. Each read sensor of the plurality of read sensors is configured to sense a magnetic field of the magnetic medium and to generate a signal based on the magnetic field. Circuitry is configured to combine the signals of the plurality of read sensors to generate a resulting signal. The resulting signal defines an effective read width of the electromagnetic head array, where the effective read width is narrower than a read width of any of the plurality of read sensors.
    Type: Grant
    Filed: August 19, 2013
    Date of Patent: December 16, 2014
    Assignee: Marvell International Ltd.
    Inventor: Richard Travis Behrens
  • Publication number: 20140362472
    Abstract: A perpendicular magnetic recording medium includes a nonmagnetic substrate, an underlayer provided above the nonmagnetic substrate, and a perpendicular recording layer provided above the underlayer. The perpendicular recording layer includes a first magnetic layer including Co and Pt and having a granular structure, and a second magnetic layer having magnetic and ferroelectric properties.
    Type: Application
    Filed: June 6, 2014
    Publication date: December 11, 2014
    Inventors: Akira SAKAWAKI, Akira Yamane
  • Patent number: 8879205
    Abstract: In one embodiment, a MAMR head includes a main magnetic pole, a STO positioned near the main magnetic pole, the STO including a first perpendicular magnetic layer positioned above the main magnetic pole, wherein the first perpendicular magnetic layer is a first spin polarization layer having an axis of magnetic anisotropy in a direction perpendicular to a film surface, a first non-magnetic transmission layer positioned above the first perpendicular magnetic layer, a magnetic layer effectively having a plane of easy magnetization in the film surface positioned above the first non-magnetic transmission layer, the magnetic layer being a FGL, a second non-magnetic transmission layer positioned above the magnetic layer, and a second perpendicular magnetic layer positioned above the second non-magnetic transmission layer, wherein the second perpendicular magnetic layer is a second spin polarization layer having magnetic anisotropy in the direction perpendicular to the film plane.
    Type: Grant
    Filed: November 13, 2012
    Date of Patent: November 4, 2014
    Assignee: HGST Netherlands B.V.
    Inventors: Masato Shiimoto, Keiichi Nagasaka, Masukazu Igarashi
  • Patent number: 8871102
    Abstract: A method for fabricating a structure in magnetic recording head is described. First and second hard mask layers are provided on the layer(s) for the structure. A BARC layer and photoresist mask having a pattern are provided on the second hard mask layer. The pattern includes a line corresponding to the structure. The pattern is transferred to the BARC layer and the second hard mask layer in a single etch using an etch chemistry. At least the second hard mask layer is trimmed using substantially the same first etch chemistry. A mask including a hard mask line corresponding to the line and less than thirty nanometers wide is thus formed. The pattern of the second hard mask is transferred to the first hard mask layer. The pattern of the first hard mask layer is transferred to the layer(s) such that the structure has substantially the width.
    Type: Grant
    Filed: May 25, 2011
    Date of Patent: October 28, 2014
    Assignee: Western Digital (Fremont), LLC
    Inventor: Wei Gao
  • Publication number: 20140313615
    Abstract: Provided herein is an apparatus, including a magnetically soft underlayer (SUL); an interlayer stack overlying the SUL, wherein the interlayer stack comprises a seed layer of an fcc material; and a perpendicular magnetic recording layer overlying the interlayer stack, wherein a thickness of the SUL in combination with a distance of the SUL from the perpendicular recording layer is sufficient to orient a total magnetic field corresponding to a magnetic transducer head at an angle of about 45°.
    Type: Application
    Filed: March 28, 2014
    Publication date: October 23, 2014
    Applicant: SEAGATE TECHNOLOGY LLC
    Inventors: Thomas P. Nolan, Li Tang, Yong-Chang Feng, Zhong (Stella) Wu, Samuel D. Harkness, Hans J. Richter, Youfeng Zheng
  • Patent number: 8867157
    Abstract: The present disclosure relates to a perpendicular pole head for creating a perpendicular magnetic moment in a concentrated pattern for writing the pattern on perpendicular magnetic media, such as BaFe based media. The pole head can have flux concentrators in the shape of the written pattern, which can be repeatedly applied to a moving magnetic medium to create a timing pattern on the media, e.g., a servo timing pattern.
    Type: Grant
    Filed: January 30, 2013
    Date of Patent: October 21, 2014
    Assignee: Imation Corp.
    Inventors: Douglas W. Johnson, Larold Olson, Yung Yip, Stephen J. Rothermel
  • Publication number: 20140300994
    Abstract: Aspects of the present invention relate to a perpendicular magnetic recording (PMR) media stack and methods for fabricating the same. The PMR media stack has a novel grain isolation initiation layer (GIIL) and/or a novel exchange-break layer (EBL) that can improve the signal-to-noise performance of the PMR media stack. The PMR media stack includes a substrate, a soft underlayer on the substrate, an interlayer positioned on the soft underlayer, and a grain isolation initiation layer (GIIL) positioned on the interlayer, a magnetic layer positioned on the GIIL, and an exchange break layer (EBL) positioned on the magnetic layer. The GIIL and/or EBL includes a CoCrRu-oxide.
    Type: Application
    Filed: June 6, 2013
    Publication date: October 9, 2014
    Inventors: DAEHOON HONG, SY VU, KYONGHA KANG, B. RAMAMURTHY ACHARYA
  • Patent number: 8848309
    Abstract: A high frequency, AC-modulated heater current is applied to a heater of a magnetic head. A resistance change of a temperature sensor located at a region of proximity to a magnetic media is determined. The resistance change occurs in response to the heater current. At least one of a spacing and contact between the magnetic head and the magnetic media is determined based on a frequency-domain signature of the resistance change.
    Type: Grant
    Filed: July 9, 2012
    Date of Patent: September 30, 2014
    Assignee: Seagate Technology LLC
    Inventor: Richard A. Budde
  • Patent number: 8842387
    Abstract: In one embodiment, a high-frequency magnetic field-assisted magnetic recording (MAMR) head includes: a yoke adapted for facilitating magnetic flux through the MAMR head; a main pole magnetically coupled to the yoke and adapted for producing a writing magnetic field; a return pole spaced from the main pole; a spin torque oscillator (STO) positioned above the main pole; and a back gap layer positioned between the yoke and the return pole, where at least one of the yoke, the main pole, the return pole, and the back gap layer comprises a highly resistive magnetic material.
    Type: Grant
    Filed: March 14, 2013
    Date of Patent: September 23, 2014
    Assignee: HGST Netherlands B.V.
    Inventors: Tomoya Horide, Tomohiro Okada
  • Publication number: 20140268414
    Abstract: There is provided a magnetic recording medium including a magnetic layer. The magnetic layer has a servo signal recorded thereon by magnetizing a part of the magnetic layer in a first direction. The first direction contains a component of a perpendicular direction that is perpendicular to a top surface of the magnetic layer. The magnetic layer is pre-magnetized in a second direction before recording of the servo signal. The second direction contains the component of the perpendicular direction. The second direction is opposite to the first direction.
    Type: Application
    Filed: March 12, 2014
    Publication date: September 18, 2014
    Applicant: Sony Corporation
    Inventors: Eiji NAKASHIO, Hiroshi MORITA, Kiyoyuki MIYATA
  • Patent number: 8837081
    Abstract: A method and system provide a touchdown sensor for use in disk drive. The touchdown sensor includes a sensor layer including a plurality of magnetic layers interleaved with at least one nonmagnetic layer. The plurality of magnetic layers are magnetically coupled and single domain. Further, the sensor has a temperature coefficient of resistivity (TCR) of at least 0.15%/° C.
    Type: Grant
    Filed: December 6, 2011
    Date of Patent: September 16, 2014
    Assignee: Western Digital (Fremont), LLC
    Inventors: Chengtao R. Yu, Dehua Han, Ying Hong, Feng Liu, Laurence L. Chen, Zhanjie Li, Zhigang Bai, Yu Lo, Yunfei Ding
  • Patent number: 8830623
    Abstract: In one embodiment, a magnetic head includes a main magnetic pole, a trailing shield positioned on a trailing side of the main magnetic pole, a trailing gap positioned between the trailing shield and the main magnetic pole, side shields positioned on either side of the main magnetic pole in a cross-track direction, side gaps positioned between the side shields and the main magnetic pole on either side of the main magnetic pole in the cross-track direction, and trailing shield gaps positioned on either side of the main magnetic pole in the cross-track direction between the trailing shield and the side shields, wherein the trailing shield gaps extend beyond the side gaps in a direction parallel to the cross-track direction. In addition, a method for producing a magnetic head as described above is also disclosed, according to one embodiment.
    Type: Grant
    Filed: December 19, 2011
    Date of Patent: September 9, 2014
    Assignee: HGST Netherlands B.V.
    Inventors: Tomoaki Hamasaki, Hiroyuki Katada, Isao Nunokawa, Kimitoshi Etoh
  • Publication number: 20140247519
    Abstract: According to one embodiment, there is provided a magnetic recording medium which includes a base, a magnetic recording layer having convex-shaped magnetic layers, which is formed on the base, and a protective film formed on the magnetic recording layer. There are gaps in a region surrounded by the protective film, the surface of the base, and each side wall of each magnetic layer.
    Type: Application
    Filed: July 17, 2013
    Publication date: September 4, 2014
    Inventors: Kazutaka Takizawa, Akira Watanabe, Kaori Kimura, Tsuyoshi Onitsuka, Takeshi Iwasaki, Masahiro Takashita, Akihiko Takeo