Thermomagnetic Recording Or Transducers Patents (Class 360/59)
  • Patent number: 11508402
    Abstract: Aspects of the present disclosure generally relate to slider assemblies for magnetic heads of magnetic recording devices. In one aspect, a slider assembly for magnetic recording devices includes a slider and an anti-reflection coating (ARC) structure disposed on the slider. The ARC structure includes an outer surface facing away from the slider, and a recess extending into the outer surface to define a recessed surface. The slider assembly includes a soldered structure disposed on the recessed surface and at least partially in the recess of the ARC structure. In one aspect, a method of forming a slider assembly includes forming an anti-reflection coating (ARC) structure on a slider. The ARC structure includes an outer surface facing away from the slider. The method includes forming a recess in the ARC structure, and forming a solder structure on a recessed surface and at least partially in the recess of the ARC structure.
    Type: Grant
    Filed: September 16, 2021
    Date of Patent: November 22, 2022
    Assignee: Western Digital Technologies, Inc.
    Inventors: Artorn Pokaipisit, Krisda Siangchaew, Sakthavorn Phongwanitchaya
  • Patent number: 11488623
    Abstract: According to one embodiment, an evaluation method of a magnetic head is disclosed. The method can include acquiring an electrical signal obtained from a magnetic element when supplying a first alternating current to a coil of a magnetic head and supplying a second current to the magnetic element. The magnetic head includes a first magnetic pole, a second magnetic pole, and a coil. The magnetic element is provided between the first magnetic pole and the second magnetic pole, and includes a first magnetic layer. The method can include detecting a time required for a change of an electrical resistance of the magnetic element based on a time when a polarity of the first alternating current is reversed based on the electrical signal.
    Type: Grant
    Filed: July 30, 2021
    Date of Patent: November 1, 2022
    Assignees: KABUSHIKI KAISHA TOSHIBA, Toshiba Electronic Devices & Storage Corporation
    Inventors: Hirofumi Suto, Tazumi Nagasawa, Masayuki Takagishi, Naoyuki Narita, Tomoyuki Maeda
  • Patent number: 11456011
    Abstract: An apparatus comprises a slider configured to facilitate heat assisted magnetic recording and a submount affixed to the slider. A laser unit is affixed to the submount and comprises a laser operable in a non-lasing state and a lasing state. A heater is embedded in the laser unit or the submount. The heater is configured to generate preheat for heating the laser during the non-lasing state and to generate steering heat for heating the laser during the lasing state.
    Type: Grant
    Filed: August 20, 2021
    Date of Patent: September 27, 2022
    Assignee: Seagate Technology LLC
    Inventors: James Gary Wessel, Roger L. Hipwell, Jr.
  • Patent number: 11437069
    Abstract: According to one embodiment, a magnetic recording and reproducing device includes a perpendicular magnetic recording medium, a perpendicular magnetic recording head, a thermal assisted magnetic recording medium, and a thermal assisted magnetic recording head.
    Type: Grant
    Filed: July 16, 2021
    Date of Patent: September 6, 2022
    Assignees: KABUSHIKI KAISHA TOSHIBA, TOSHIBA ELECTRONIC DEVICES & STORAGE CORPORATION
    Inventors: Takuya Matsumoto, Hiroshi Isokawa
  • Patent number: 11393493
    Abstract: According to one embodiment, a magnetic recording head includes a first magnetic pole, a second magnetic pole, and a stacked body provided between the first magnetic pole and the second magnetic pole. The stacked body includes a first magnetic layer, a second magnetic layer provided between the first magnetic layer and the second magnetic pole, a first non-magnetic layer provided between the first magnetic layer and the second magnetic layer, a second non-magnetic layer provided between the second magnetic layer and the second magnetic pole, and a third non-magnetic layer provided between the first magnetic pole and the first magnetic layer. The first magnetic layer includes a first element including at least one of Fe, Co, or Ni. The second magnetic layer includes the first element, and a second element including at least one selected from the group consisting of Cr, V, Mn, Ti, and Sc.
    Type: Grant
    Filed: August 10, 2021
    Date of Patent: July 19, 2022
    Assignees: KABUSHIKI KAISHA TOSHIBA, TOSHIBA ELECTRONIC DEVICES & STORAGE CORPORATION
    Inventors: Yuji Nakagawa, Naoyuki Narita, Masayuki Takagishi, Tomoyuki Maeda, Tazumi Nagasawa, Hitoshi Iwasaki, Hirofumi Suto
  • Patent number: 11380354
    Abstract: A recording head includes a nanorod configured to heat a hotspot on a recording media, a plasmonic plate configured to concentrate an electric field to excite the nanorod, and a heat sink configured to dissipate heat from the nanorod. The recording head includes a first diffusion barrier plate configured to resist diffusion of materials between the plasmonic plate and the nanorod and a second diffusion barrier plate configured to resist diffusion of materials between the heat sink and the nanorod. The first diffusion barrier plate is disposed between the nanorod and the plasmonic plate and is coupled to a bottom surface of the nanorod. The second diffusion barrier plate is disposed between the heat sink and the nanorod and is coupled to the top surface of the nanorod.
    Type: Grant
    Filed: April 22, 2021
    Date of Patent: July 5, 2022
    Assignee: SEAGATE TECHNOLOGY LLC
    Inventor: Chubing Peng
  • Patent number: 11355049
    Abstract: An electronic device may include an electronic display having multiple pixels to display an image based on processed image data. Each of the pixels may include multiple sub-pixels. The electronic device may also include image processing circuitry to receive first image data for a sub-pixel of the and second image data for a group of sub-pixels surrounding the sub-pixel. The first image data may include a luminance value for the sub-pixel and the second image data may include luminance values for each sub-pixel of the group. The image processing circuitry may also determine a compensation value, to compensate the luminance value for lateral current leakage between the sub-pixel and the group of sub-pixels, based on the luminance value of the sub-pixel and the luminance values for each sub-pixel of the group of sub-pixels.
    Type: Grant
    Filed: August 26, 2020
    Date of Patent: June 7, 2022
    Assignee: Apple, Inc.
    Inventors: Chaohao Wang, Sheng Zhang, Yingying Tang, Yunhui Hou
  • Patent number: 11348604
    Abstract: The magnetic recording and reproducing device includes a magnetic recording medium, a recording element, and a reproducing element. The recording element is an inductive recording element having a first magnetic pole which generates a magnetic field, and a second magnetic pole which is spaced apart from the first magnetic pole with a write gap interposed therebetween, a tip width of the first magnetic pole is substantially the same as a tip width of the second magnetic pole, and a reproducing element width of the reproducing element is 0.5 ?m to 0.8 ?m. The magnetic recording medium has a non-magnetic support, and a magnetic layer containing a ferromagnetic powder, and the number of recesses, which are present in a surface of the magnetic layer and have an equivalent circle diameter of 0.20 ?m to 0.50 ?m, is 10 to 500 per area of 40 ?m×40 ?m.
    Type: Grant
    Filed: June 4, 2021
    Date of Patent: May 31, 2022
    Assignee: FUJIFILM Corporation
    Inventors: So Matsuyama, Norihito Kasada, Takuto Kurokawa
  • Patent number: 11335373
    Abstract: 3D optical data storage refers to forms of optical data storage in which information can be recorded and/or read with 3D resolution. 3D optical media are generally limited in areal density by the diffraction limit of laser light used to read and/or write data to and/or from the optical media. It is thus advantageous to find ways to store data on 3D optical media with a spot size below the diffraction limit of an associated laser reader to further increase areal density of the optical media. A hybrid approach that utilizes plasmon technology to access a surface layer of the 3D optical media with an extremely small spot size and photon technology to access interior layers of the 3D optical media with a larger spot size may substantially increase overall data density of the 3D optical media.
    Type: Grant
    Filed: February 22, 2021
    Date of Patent: May 17, 2022
    Assignee: SEAGATE TECHNOLOGY LLC
    Inventors: Krishnan Subramanian, Aditya Jain, Riyan Alex Mendonsa, Anil J. Reddy, Edward Charles Gage
  • Patent number: 11289119
    Abstract: A recording head has a near-field transducer proximate a media-facing surface of the recording head. A write pole has a leading edge proximate to and facing the near-field transducer at the media-facing surface. A magnetic shield faces the leading edge of the write pole at the media-facing surface and is magnetically coupled to the write pole. The magnetic shield has a notch centered over the near-field transducer.
    Type: Grant
    Filed: March 24, 2020
    Date of Patent: March 29, 2022
    Assignee: Seagate Technology LLC
    Inventors: Mourad Benakli, Kirill Alexander Rivkin, Hua Zhou, Martin Giles Blaber, TaeWoo Lee, Michael Allen Seigler, Huaqing Yin
  • Patent number: 11264053
    Abstract: A recording head has a near-field transducer proximate a media-facing surface of the recording head. The near-field transducer extends a first distance away from the media-facing surface. A waveguide overlaps and delivers light to the near-field transducer. Two subwavelength focusing mirrors are at an end of the waveguide proximate the media-facing surface. The subwavelength mirrors are on opposite crosstrack sides of the near-field transducer and separated from each other by a crosstrack gap. The subwavelength focusing mirrors each include a first material at the media-facing surface and a liner that covers an edge of the mirror.
    Type: Grant
    Filed: March 29, 2021
    Date of Patent: March 1, 2022
    Assignee: Seagate Technology LLC
    Inventors: Weibin Chen, Nan Zhou, Ruoxi Yang, Michael Allen Seigler
  • Patent number: 11257525
    Abstract: A data storage device is disclosed comprising a head actuated over a magnetic media, wherein the head comprises a laser and a near field transducer (NFT). A thermal gradient produced in the magnetic media by the NFT is periodically measured, and a failure of the NFT is predicted based on a slope of the thermal gradient measurements.
    Type: Grant
    Filed: February 16, 2021
    Date of Patent: February 22, 2022
    Assignee: WESTERN DIGITAL TECHNOLOGIES, INC.
    Inventors: Sukumar Rajauria, Pierre-Olivier Jubert, Richard M. Brockie
  • Patent number: 11222657
    Abstract: A recording head has a waveguide that delivers optical energy from an energy source and a write pole extending to a media-facing surface of the recording head. The recording head also has a near-field transducer coupled to receive the optical energy from the waveguide and emit surface plasmons from the media-facing surface towards a recording medium while the write pole applies a magnetic field to the recording medium. The near-field transducer has an extended portion that, as-manufactured, protrudes beyond the media-facing surface by a first distance.
    Type: Grant
    Filed: December 30, 2020
    Date of Patent: January 11, 2022
    Assignee: Seagate Technology LLC
    Inventors: Michael A. Seigler, Peng Zhang, David James Ellison, James D. Kiely, Edwin F. Rejda
  • Patent number: 11221354
    Abstract: Embodiments of the invention include a resonant sensing system comprising driving circuitry to generate a drive signal during excitation time periods, a first switch coupled to the driving circuitry, and a sensing device coupled to the driving circuitry via the first switch during the excitation time periods. The sensing device includes beams to receive the drive signal during a first excitation time period that causes the beams to mechanically oscillate and generate a first induced electromotive force (emf) in response to the drive signal. The first switch decouples the sensing device and the driving circuitry during measurement time periods for measurement of the induced emf.
    Type: Grant
    Filed: July 1, 2016
    Date of Patent: January 11, 2022
    Assignee: Intel Corporation
    Inventors: Georgios C. Dogiamis, Sasha N. Oster, Feras Eid, Ian A. Young
  • Patent number: 11127421
    Abstract: A heat-assisted magnetic recording (HAMR) write head has a write pole with a chemically-passivated end that substantially prevents oxidation and thus improves corrosion resistance of the write pole. The write pole and near-field transducer (NFT) are supported on a slider and have their ends in a window region of the slider's disk-facing surface. The outer surface region of the write pole is chemically-passivated, preferably by exposure to a nitrogen plasma. The nitrogen plasma has no effect on the NFT end or on the magnetoresistive read head, which is protected because it is located in a non-window region of the slider's disk-facing surface. An optically transparent protective film is formed in the window over the passivated write pole end and NFT end.
    Type: Grant
    Filed: February 8, 2021
    Date of Patent: September 21, 2021
    Assignee: Western Digital Technologies, Inc.
    Inventors: Krisda Siangchaew, Barry Cushing Stipe, Nattaporn Khamnualthong
  • Patent number: 11114127
    Abstract: According to one embodiment, a magnetic disk device includes: a disk; a head including a main magnetic pole, a write shield that faces the main magnetic pole in a first direction and is separated from the main magnetic pole by a gap, a first assist element that is disposed in the gap and a second assist element that is disposed in the gap and is positioned relative to the first assist element in a second direction intersecting the first direction; and a controller configured to: cause a first assist energy from the first assist element to be applied to the disk and affect a coercive force of the disk; and cause a second assist energy from the second assist element to be applied to the disk and affect a coercive force of the disk, wherein the first assist energy is different from the second assist energy.
    Type: Grant
    Filed: March 2, 2020
    Date of Patent: September 7, 2021
    Assignees: KABUSHIKI KAISHA TOSHIBA, TOSHIBA ELECTRONIC DEVICES & STORAGE CORPORATION
    Inventors: Hiroyuki Suzuki, Akihiko Takeo
  • Patent number: 11107497
    Abstract: A recording head includes a near-field transducer proximate a media-facing surface of the recording head and a waveguide that overlaps and delivers light to the near-field transducer. The recording head includes subwavelength-sized focusing mirror comprising first and second reflectors disposed on cross track sides of the near-field transducer. Each of the first and second reflectors is spaced apart from the media-facing surface by a distance, D, measured along an axis normal to the media-facing surface.
    Type: Grant
    Filed: December 23, 2019
    Date of Patent: August 31, 2021
    Assignee: Seagate Technology LLC
    Inventors: Ruoxi Yang, YongJun Zhao, Nan Zhou, Weibin Chen, Huaqing Yin, Michael Allen Seigler
  • Patent number: 11100951
    Abstract: An apparatus comprises a slider configured to facilitate heat assisted magnetic recording and a submount affixed to the slider. A laser unit is affixed to the submount and comprises a laser operable in a non-lasing state and a lasing state. A heater is embedded in the laser unit or the submount. The heater is configured to generate preheat for heating the laser during the non-lasing state and to generate steering heat for heating the laser during the lasing state.
    Type: Grant
    Filed: July 24, 2020
    Date of Patent: August 24, 2021
    Assignee: Seagate Technology LLC
    Inventors: James Gary Wessel, Roger L. Hipwell, Jr.
  • Patent number: 10984822
    Abstract: The present disclosure describes aspects of pulse-based writing for magnetic storage media. In some aspects, a pulse-based writer of magnetic storage media determines that a string of data bits having a same polarity corresponds to a magnet longer than a threshold associated with a magnetic media writer. The pulse-based writer inserts, into the string of data bits, a transition to a polarity opposite to the same polarity of the string of data bits. The string of data bits including the inserted transition is then transmitted to the magnetic media writer to cause a write head of the writer to pulse while writing the magnet to magnetic storage media. Various aspects may also implement a control signal to mask a transition or control polarity of the magnetic media writer. By so doing, magnets may be written to the magnetic storage media more efficiently or with less distortion to neighboring tracks.
    Type: Grant
    Filed: July 14, 2020
    Date of Patent: April 20, 2021
    Assignee: Marvell Asia PTE, Ltd.
    Inventors: Mats Oberg, Hao Fang
  • Patent number: 10943613
    Abstract: A thermally assisted magnetic head including a slider and a light source-unit. The slider includes a slider substrate and a magnetic head part. The light source-unit includes a laser diode and a sub-mount. The magnetic head part includes a medium-opposing surface, a light source-opposing surface and a waveguide which guides laser light from the light source-opposing surface to the medium-opposing surface. The slider substrate includes a light source-cavity formed in a light source-placing surface on which the light source-unit is placed. The light source-cavity includes an opening concave part being formed larger than a mount bottom surface of the sub-mount. The mount bottom surface of the sub-mount is inserted into the opening concave part to be joined to the light source-cavity.
    Type: Grant
    Filed: March 13, 2020
    Date of Patent: March 9, 2021
    Assignees: SAE Magnetics (H.K.) Ltd., Headway Technologies, Inc.
    Inventors: Ryo Hosoi, Takashi Honda, Seiichi Takayama, Sik Fun Chan, Tai Boon Lee, Dayu Zhou
  • Patent number: 10923145
    Abstract: A microwave-assisted magnetic recording (MAMR) write head has a spin-torque oscillator (STO) and a ferromagnetic compensation layer between the write pole and trailing shield. The compensation layer is separated from a free layer by a nonmagnetic barrier layer that prevents spin-polarized electrons from the free layer from reaching the compensation layer. The compensation layer may be located between the write pole and the free layer. Electrons become spin-polarized by the compensation layer and are reflected back from the write pole across a nonmagnetic spacer layer. This causes the magnetization of the compensation layer to flip and become antiparallel to the magnetization of the free layer. The compensation layer thus generates a DC offset field that compensates for the negative effect of the DC shunting field from the free layer.
    Type: Grant
    Filed: March 30, 2020
    Date of Patent: February 16, 2021
    Assignee: WESTERN DIGITAL TECHNOLOGIES, INC.
    Inventors: Alexander Goncharov, Muhammad Asif Bashir
  • Patent number: 10839833
    Abstract: A spin transfer torque (STT) device is formed on an electrically conductive substrate and includes a ferromagnetic polarizer layer near the substrate, a ferromagnetic free layer, and a nonmagnetic spacer layer between the ferromagnetic polarizer layer and the ferromagnetic free layer. A multilayer structure is located between the substrate and the ferromagnetic polarizer layer. The multilayer structure includes a metal or metal alloy seed layer for the ferromagnetic polarizer layer and an intermediate oxide layer below and in contact with the seed layer. The intermediate oxide layer reflects spin current from the write pole and thus reduces undesirable spin pumping of the ferromagnetic polarizer layer.
    Type: Grant
    Filed: February 27, 2020
    Date of Patent: November 17, 2020
    Assignee: WESTERN DIGITAL TECHNOLOGIES, INC
    Inventors: James Mac Freitag, Masahiko Hashimoto, Zheng Gao, Susumu Okamura
  • Patent number: 10832704
    Abstract: A method includes generating, during manufacture of a heat-assisted magnetic recording (HAMR) disk drive, a temperature compensation equation for a compensation factor using initial operating currents supplied to a laser diode of the disk drive at different initial operating temperatures and an efficiency value based on the initial operating temperatures. The operating currents are representative of currents for recording data to or erasing data from a magnetic recording medium. The temperature compensation equation is stored in the disk drive. A subsequent efficiency value is determined based on at least one of the initial operating temperatures and an operating temperature differing from the initial operating temperatures. An updated compensation factor at the operating temperature is determined during field operation using the temperature compensation equation and the subsequent efficiency value. An updated operating current is calculated using the updated compensation factor and the operating temperature.
    Type: Grant
    Filed: December 17, 2019
    Date of Patent: November 10, 2020
    Assignee: Seagate Technology LLC
    Inventor: Drew Michael Mader
  • Patent number: 10825478
    Abstract: According to one embodiment, a magnetic recording apparatus measures and stores recording signal quality of a disk at an initial stage, inspects the recording signal quality before data is recorded, determines whether or not the recording signal quality obtained in the inspection satisfies a standard when compared to the stored recording signal quality at the initial stage, adjusts, based on a result of the determination, light irradiation power of a light irradiation element so as to satisfy the standard, determines a read offset amount based on a result of the adjustment, and performs control so that a position of a read head is shifted based on the determined read offset amount.
    Type: Grant
    Filed: January 27, 2020
    Date of Patent: November 3, 2020
    Assignees: Kabushiki Kaisha Toshiba, Toshiba Electronic Devices & Storage Corporation
    Inventor: Takuya Matsumoto
  • Patent number: 10818492
    Abstract: The present invention provides a method for manufacturing a thin film transistor including processing of irradiating an amorphous silicon film 8 deposited on a substrate with laser light. The method comprises: a laser annealing step for forming a polysilicon film 9 including a channel region 52 by irradiating an area including a formation region of the region 52 in the film 8 with the laser light such that the area including the formation region is heated, melted, and recrystallized; and a removing step for etching off an area outside the region 52 from the polysilicon film 9. Thus, the present invention can provide a method for manufacturing a thin film transistor and a mask for use in the manufacturing method that are capable of promoting the recrystallization of the film 8 and thereby improving its electron mobility even when laser irradiation has to be performed under restricted irradiation conditions.
    Type: Grant
    Filed: August 28, 2018
    Date of Patent: October 27, 2020
    Assignee: V TECHNOLOGY CO., LTD.
    Inventor: Michinobu Mizumura
  • Patent number: 10811042
    Abstract: A thermally assisted magnetic recording head and a thermally assisted magnetic recording disk drive are disclosed. The thermally assisted magnetic recording head includes a slider body, a laser substrate, a laser and a magnetic head, wherein the laser substrate is provided on the slider body, the laser is provided on the laser substrate, and the magnetic head is provided at a front end of the slider body. The magnetic head includes an optical waveguide facing the laser. The angle between a light incident surface of the optical waveguide and an incident direction of a laser light incident on the optical waveguide is less than 90 degrees. The thermally assisted magnetic recording disk drive includes a plurality of magnetic disks and a magnetic head suspending frame. A front end of the magnetic head suspending frame is provided with the thermally assisted magnetic recording heads mentioned above.
    Type: Grant
    Filed: December 24, 2018
    Date of Patent: October 20, 2020
    Assignee: SAE Magnetics (H.K.) Ltd.
    Inventors: Ryuji Fujii, Jian Hui Huang, Natsuo Nishijima, Lin Huang, Shi Xiong Chen, Bin Qi, Wen Rong Guo
  • Patent number: 10788547
    Abstract: A magnetoresistive memory device includes a magnetic-exchange-coupled layer stack containing a free layer, a reference layer and an electrically conductive, non-magnetic interlayer exchange coupling layer located between the free layer and the reference layer, and an insulating spacer layer located in a series connection with the magnetic-exchange-coupled layer stack between a first electrode and a second electrode. The first electrode and the second electrode are configured to provide a programming voltage across the magnetic-exchange-coupled layer stack and the insulating spacer layer.
    Type: Grant
    Filed: January 17, 2019
    Date of Patent: September 29, 2020
    Assignee: SANDISK TECHNOLOGIES LLC
    Inventors: Alan Kalitsov, Derek Stewart, Gerardo Bertero
  • Patent number: 10783918
    Abstract: An apparatus comprises a slider configured to facilitate heat assisted magnetic recording and a submount affixed to the slider. A laser unit is affixed to the submount and comprises a laser operable in a non-lasing state and a lasing state. A heater is embedded in the laser unit or the submount. The heater is configured to generate preheat for heating the laser during the non-lasing state and to generate steering heat for heating the laser during the lasing state.
    Type: Grant
    Filed: October 3, 2019
    Date of Patent: September 22, 2020
    Assignee: Seagate Technology LLC
    Inventors: James Gary Wessel, Roger L. Hipwell, Jr.
  • Patent number: 10773972
    Abstract: Embodiments of synthetic garnet materials having advantageous properties, especially for below resonance frequency applications, are disclosed herein. In particular, embodiments of the synthetic garnet materials can have high Curie temperatures and dielectric constants while maintaining low magnetization. These materials can be incorporated into isolators and circulators, such as for use in telecommunication base stations.
    Type: Grant
    Filed: July 10, 2017
    Date of Patent: September 15, 2020
    Assignee: Skyworks Solutions, Inc.
    Inventors: David Bowie Cruickshank, Michael David Hill
  • Patent number: 10777219
    Abstract: Embodiments of the present disclosure generally relate to data storage devices, and more specifically, to storage devices employing an energy-assisted magnetic recording write head. The write head may comprise a main pole, a trailing shield, a conducting gap disposed between the main pole and the trailing shield, and one or more current blockers. The conducting gap may be conformal with the main pole. The one or more current blockers may be configured to direct the current from the main pole to the trailing shield through the conducting gap. The one or more current blockers may be further configured to recess the conducting gap away from the media facing surface. The one or more current blockers may be configured to direct the current away from a media facing surface of the write head.
    Type: Grant
    Filed: June 24, 2019
    Date of Patent: September 15, 2020
    Assignee: Western Digital Technologies, Inc.
    Inventors: Muhammad Asif Bashir, Yaguang Wei, Petrus Antonius Van Der Heijden, Xinjiang Shen, Terence Lam, Zhigang Bai, Youfeng Zheng, Changqing Shi, Michael Kuok San Ho, Jian-Gang Zhu, Lijie Guan, Venkatesh Chembrolu
  • Patent number: 10714129
    Abstract: A microwave assisted magnetic recording writer has a main pole (MP) with a write gap formed between the MP trailing side and a trailing shield, a side gap between each MP side and a side shield, and a leading gap between the MP leading side and a leading shield. A spin torque oscillator (STO) is formed in at least each side gap and recessed from the air bearing surface to reduce wear. Each STO has a flux guiding layer (FGL) with a magnetization that flips to a direction substantially opposite to the gap field when a current of sufficient density is applied from the adjacent shield towards the MP thereby forcing additional flux out of the MP at the ABS to enhance writability on a magnetic recording medium. Accordingly, the gap between the recessed STO and ABS is reduced to provide enhanced area density capability without sacrificing overwrite.
    Type: Grant
    Filed: April 2, 2019
    Date of Patent: July 14, 2020
    Assignee: Headway Technologies, Inc.
    Inventors: Yuhui Tang, Ying Liu
  • Patent number: 10658101
    Abstract: A transformer includes a magnetic core, a first coil unit and a second coil unit. The first coil unit is disposed within the magnetic core and includes a laminated board having layers laminated therein and conductive patterns. Respective ones of the conductive patterns are disposed on the laminated layers. The second coil unit includes a conductive wire spaced apart from the conductive patterns of the laminated board by an insulating distance. The conductive wire includes a triple-insulated wire surrounded by three sheets of insulating paper to maintain the insulating distance from the conductive patterns.
    Type: Grant
    Filed: April 22, 2019
    Date of Patent: May 19, 2020
    Assignee: SOLUM CO., LTD.
    Inventors: Jae Gen Eom, Young Seung Noh, Heung Gyoon Choi, Geun Young Park, Sung Yun Han, Seh Hoon Jang, Nak Jun Jeong, Young Min Lee, Jong Woo Kim, Tae Won Heo
  • Patent number: 10650854
    Abstract: A heat-assisted magnetic recording (HAMR) medium has a heat-sink layer, a chemically-ordered FePt (or CoPt) alloy magnetic layer and a MgNiO intermediate layer between the heat-sink layer and the magnetic layer. The intermediate layer is a solid substitution crystalline alloy of the form (Mg(100-y)Niy)O, where y is less than 10 and greater than or equal to 0.5. The magnetic layer may be formed directly on the MgNiO intermediate layer, in which case the MgNiO intermediate layer functions as both a seed layer and a thermal barrier layer. The HAMR medium may also include an optional layer of crystalline “pure” MgO directly below or directly above the MgNiO intermediate layer. If the MgO layer is located directly above the MgNiO intermediate layer then the MgNiO intermediate layer functions primarily as a thermal barrier layer. The HAMR medium with the MgNiO intermediate layer provides a substantial improvement in corrosion resistance.
    Type: Grant
    Filed: April 17, 2017
    Date of Patent: May 12, 2020
    Assignee: Western Digital Technologies, Inc.
    Inventors: Hua Yuan, Paul Christopher Dorsey, Fenghua Zong, Shahid Ali Pirzada, Allen Joseph Bourez, Zhaoqiang Bai
  • Patent number: 10636444
    Abstract: An apparatus includes a first magnetic layer. A second magnetic layer overlies the first magnetic layer and is magnetically softer than the first magnetic layer. An exchange control layer is between the first magnetic layer and the second magnetic layer. The includes a higher Ms (saturation magnetization) than the first magnetic layer at room temperature.
    Type: Grant
    Filed: February 20, 2019
    Date of Patent: April 28, 2020
    Assignee: SEAGATE TECHNOLOGY LLC
    Inventors: Thomas Young Chang, Thomas P. Nolan
  • Patent number: 10614944
    Abstract: A transformer includes a magnetic core, a first coil unit and a second coil unit. The first coil unit is disposed within the magnetic core and includes a laminated board having layers laminated therein and conductive patterns. Respective ones of the conductive patterns are disposed on the laminated layers. The second coil unit includes a conductive wire spaced apart from the conductive patterns of the laminated board by an insulating distance. The conductive wire includes a triple-insulated wire surrounded by three sheets of insulating paper to maintain the insulating distance from the conductive patterns.
    Type: Grant
    Filed: April 22, 2019
    Date of Patent: April 7, 2020
    Assignee: SOLUM CO., LTD.
    Inventors: Jae Gen Eom, Young Seung Noh, Heung Gyoon Choi, Geun Young Park, Sung Yun Han, Seh Hoon Jang, Nak Jun Jeong, Young Min Lee, Jong Woo Kim, Tae Won Heo
  • Patent number: 10614850
    Abstract: Systems and methods for coating a near field transducer in a dielectric material are described. In one embodiment, the method may include forming a liquid solution comprising at least a first dielectric and a disk surface lubricant, forming a coating of the liquid solution on an outer surface of a storage medium based at least in part on dipping the storage medium in the liquid solution, and accumulating a first set of molecules of the first dielectric on a near field transducer (NFT) of a HAMR head based at least in part on evaporating a first portion of the first dielectric in the coating by performing a first HAMR writing operation that shines a laser on the coating.
    Type: Grant
    Filed: March 12, 2019
    Date of Patent: April 7, 2020
    Assignee: SEAGATE TECHNOLOGY LLC
    Inventors: Paul M. Jones, Martin Blaber, Xiaoding Ma, Yuhang Cheng
  • Patent number: 10545287
    Abstract: A manufacturing method for a waveguide includes forming a core including a first and a second layer. The first layer has a top surface including a first region opposed to a bottom surface of the second layer, and a second region not opposed to the bottom surface of the second layer. Forming the core includes a step of forming an initial first layer, an etching stopper layer on the second region of the top surface of the initial first layer, an initial second layer on the initial first layer and the etching stopper layer, and a step of etching the initial second layer until the etching stopper layer is exposed, to make the initial second layer into the second layer. A difference between the refractive index of the etching stopper layer and the core is smaller than or equal to 10% of the refractive index of the core.
    Type: Grant
    Filed: November 30, 2018
    Date of Patent: January 28, 2020
    Assignee: HEADWAY TECHNOLOGIES, INC.
    Inventors: Yukinori Ikegawa, Yoshitaka Sasaki, Hiroyuki Ito, Shigeki Tanemura, Hironori Araki
  • Patent number: 10529362
    Abstract: A magnet structure for a magnetic data storage medium erasing apparatus includes a first half comprising a first plurality of magnets arranged symmetrically, having polarization direction of adjacent magnets in quadrature and at an oblique angle with respect to a plane of symmetry. A second half comprises a second plurality of magnets arranged symmetrically, having polarization direction of adjacent magnets in quadrature and at an oblique angle with respect to the plane of symmetry. The second half is arranged symmetrically with respect to the first half, wherein the first half and the second half are separated by an air gap disposed about the plane of symmetry.
    Type: Grant
    Filed: February 7, 2019
    Date of Patent: January 7, 2020
    Assignee: Dexter Magnetic Technologies, Inc.
    Inventor: Chun Li
  • Patent number: 10522184
    Abstract: Bottom tracks are written to a recording medium using a first setting of a spin-torque oscillator of a single microwave assisted magnetic recording (MAMR) head. Top tracks are written interlaced between and partially overlapping the bottom tracks using the single MAMR head at a second setting of the MAMR head, the first and second settings resulting in different bit aspect ratios for the top and bottom tracks.
    Type: Grant
    Filed: July 9, 2019
    Date of Patent: December 31, 2019
    Assignee: Seagate Technology LLC
    Inventors: Steven Douglas Granz, Mehmet Faith Erden
  • Patent number: 10515659
    Abstract: An apparatus includes a first waveguide core extending along a light-propagation direction and configured to receive light from a light source at a combined transverse electric (TE) mode and a transverse magnetic (TM) mode. A second waveguide core is spaced apart from the first waveguide core and is configured to couple light at a TM mode to the second waveguide core. A near-field transducer (NFT) is disposed at a media-facing surface of a write head, the NFT receiving the light from the first waveguide core or the second waveguide core and heating a magnetic recording medium in response thereto.
    Type: Grant
    Filed: August 27, 2018
    Date of Patent: December 24, 2019
    Assignee: Seagate Technology LLC
    Inventors: Christopher Neil Harvey, Aidan Dominic Goggin, Kelly Elizabeth Hamilton, Reyad Mehfuz
  • Patent number: 10490216
    Abstract: A spin torque transfer (STO) assisted magnetic recording structure is disclosed wherein a STO device has capability to generate a radio frequency (RF) field on a magnetic bit to lower the required write field during a write process. The STO device contains a field generation layer (FGL) with a magnetization that flips to a direction opposite to the write gap field when a current of sufficient current density is applied thereby increasing reluctance in the write gap and causing a larger write field output at the air bearing surface. A key feature is that a single spin polarization (SP) layer and an antiferromagnetically coupled SP layer comprised of SP1 and SP2 layers are formed on opposite sides of the FGL. SP1 magnetization is greater than SP2 magnetization. Additive torque from SP and SP2 layers on the FGL enables FGL flipping while SP1 and SP2 precessional states provide the RF field.
    Type: Grant
    Filed: December 4, 2018
    Date of Patent: November 26, 2019
    Assignee: Headway Technologies, Inc.
    Inventors: Wenyu Chen, Shohei Kawasaki, Tetsuya Roppongi, Yan Wu
  • Patent number: 10431253
    Abstract: An input waveguide is disposed on a substrate-parallel plane and configured to receive light from an input surface. A mode converter joins the input waveguide at a junction away from the input surface. The mode converter converts the light from a fundamental mode to a higher-order mode. An input coupler is proximate to and overlapping the input waveguide parallel to the substrate-parallel plane. The input coupler extending from the input surface to the mode converter and has an asymmetric taper that transitions from a wider crosstrack dimension near the input surface to a narrower crosstrack dimension away from the input surface.
    Type: Grant
    Filed: May 18, 2017
    Date of Patent: October 1, 2019
    Assignee: Seagate Technology, LLC
    Inventors: John Bernard McGurk, Kelly Elizabeth Hamilton, Aidan Dominic Goggin, Mark Anthony Gubbins
  • Patent number: 10410659
    Abstract: A slider comprises an air bearing surface (ABS) and is configured to interact with a magnetic recording medium. A writer is provided on the slider and comprises a write coil having a media-facing surface situated at the ABS. Cooling arms project laterally from peripheral surfaces of the write coil and extend along the ABS. The media-facing surface of the write coil and the cooling arms are exposed to the ABS to facilitate increased cooling of the write coil at the ABS.
    Type: Grant
    Filed: February 11, 2019
    Date of Patent: September 10, 2019
    Assignee: Seagate Technology LLC
    Inventors: Gary Joseph Kunkel, Raul Horacio Andruet, James Gary Wessel
  • Patent number: 10410663
    Abstract: An apparatus comprises a slider configured for magnetic recording. The slider comprises an air bearing surface (ABS), a writer, a reader, and a plurality of electrical bond pads. A thermocouple is situated at the ABS proximate the reader and coupled to a pair of the electrical bond pads. The thermocouple is dimensioned to sense for a thermal asperity on a surface of a magnetic recording medium.
    Type: Grant
    Filed: November 14, 2017
    Date of Patent: September 10, 2019
    Assignee: Seagate Technology LLC
    Inventors: Declan Macken, Kent Bodurtha, Sissay Yoseph, Song Chen
  • Patent number: 10312012
    Abstract: A transformer includes a magnetic core, a first coil unit and a second coil unit. The first coil unit is disposed within the magnetic core and includes a laminated board having layers laminated therein and conductive patterns. Respective ones of the conductive patterns are disposed on the laminated layers. The second coil unit includes a conductive wire spaced apart from the conductive patterns of the laminated board by an insulating distance. The conductive wire includes a triple-insulated wire surrounded by three sheets of insulating paper to maintain the insulating distance from the conductive patterns.
    Type: Grant
    Filed: July 11, 2014
    Date of Patent: June 4, 2019
    Assignee: SOLUM CO., LTD.
    Inventors: Jae Gen Eom, Young Seung Noh, Heung Gyoon Choi, Geun Young Park, Sung Yun Han, Seh Hoon Jang, Nak Jun Jeong, Young Min Lee, Jong Woo Kim, Tae Won Heo
  • Patent number: 10304482
    Abstract: Devices having an air bearing surface (ABS), the devices include a write pole; a near field transducer (NFT) including a peg and a disc, wherein the peg is at the ABS of the device; an overcoat, the overcoat including a low surface energy layer.
    Type: Grant
    Filed: March 17, 2016
    Date of Patent: May 28, 2019
    Assignee: Seagate Technology LLC
    Inventors: Yuhang Cheng, Michael Seigler, Scott Franzen, Tong Zhao, Xiaoyue Huang, Steven C. Riemer, Robert Anthony Fernandez, Douglas H. Cole
  • Patent number: 10283151
    Abstract: An apparatus comprises a first electrical contact, a second electrical contact, and a semiconductor device disposed between the first and second electrical contacts. The semiconductor device comprises a laser diode and a temperature control unit. The laser diode comprises p-type semiconductor material and n-type semiconductor material. The temperature control unit comprises p-type semiconductor material, n-type semiconductor material, and a resistor coupled to the laser diode. One of the p-type semiconductor material and the n-type semiconductor material is shared by the laser diode and the temperature control unit.
    Type: Grant
    Filed: March 23, 2018
    Date of Patent: May 7, 2019
    Assignee: Seagate Technology LLC
    Inventors: James Gary Wessel, Scott Eugene Olson
  • Patent number: 10283145
    Abstract: Disclosed herein are write heads for data storage devices, methods for making and using such write heads, and data storage devices comprising such write heads. A write head comprises a near-field transducer (NFT), a thermal sensor, and a shield disposed between the NFT and the thermal sensor, wherein the shield comprises a magnetic or conductive material, such as, for example, Cu, Ag, Au, Al, Rh, Ti, Cr, Mo, Fe, Co, or Ni or an alloy that includes Cu, Ag, Au, Al, Rh, Ti, Cr, Mo, Fe, Co, and/or Ni. In some embodiments, the thermal sensor comprises a first lead and a second lead, and the shield is connected to the first lead but not the second lead to provide heat sinking for the shield.
    Type: Grant
    Filed: August 30, 2017
    Date of Patent: May 7, 2019
    Assignee: Western Digital Technologies, Inc.
    Inventors: Sukumar Rajauria, Wan Kuang, Takuya Matsumoto, Robert Smith, Erhard Schreck
  • Patent number: 10276202
    Abstract: A heat-assisted magnetic recording (HAMR) medium has a rhodium (Rh) or Rh-based alloy heat-sink layer. The Rh or Rh-based alloy does not roughen when annealed and thus does not require an intermediate layer between it and the MgO seed layer for the recording layer, so the MgO seed layer can be formed directly on and in contact with the Rh or Rh-based alloy heat-sink layer. The Rh or Rh-based alloy heat-sink layer is formed on a seed layer or multilayer that allows the Rh or Rh-based alloy to grow with the desired face-centered-cubic (fcc) crystalline structure.
    Type: Grant
    Filed: April 23, 2018
    Date of Patent: April 30, 2019
    Assignee: Western Digital Technologies, Inc.
    Inventors: Pierre-Olivier Jubert, Hua Yuan, Paul Christopher Dorsey
  • Patent number: 10269379
    Abstract: A recording head has a waveguide core with an input facet at an input surface. The waveguide core extends to a near-field transducer at a media-facing surface of the recording head. First and second cladding regions are co-planar with and on either cross-track side of the waveguide core. First and second pseudo-slab regions are co-planar with and on outer cross-track sides of the respective first and second cladding regions. The first and second pseudo-slab regions have an index of refraction higher than that of the first and second cladding regions. The first and second pseudo-slab regions confine and channel stray light away from the near-field transducer.
    Type: Grant
    Filed: January 18, 2018
    Date of Patent: April 23, 2019
    Assignee: Seagate Technology LLC
    Inventors: Aidan Dominic Goggin, Reyad Mehfuz, Kelly Elizabeth Callan, John Bernard McGurk