Thermomagnetic Recording Or Transducers Patents (Class 360/59)
  • 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: 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: 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: 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: 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: 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: 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
  • Patent number: 10234658
    Abstract: An imaging lens assembly includes a plurality of lens elements, wherein at least one of the lens elements is a dual molded lens element. The dual molded lens element includes a light transmitting portion and a light absorbing portion. The light transmitting portion includes an effective optical section. The light absorbing portion is located on at least one surface of an object-side surface and an image-side surface of the dual molded lens element, wherein a plastic material and a color of the light absorbing portion are different from a plastic material and a color of the light transmitting portion, and the light absorbing portion includes an opening. The opening is non-circular and disposed correspondingly to the effective optical section.
    Type: Grant
    Filed: July 5, 2016
    Date of Patent: March 19, 2019
    Assignee: LARGAN PRECISION CO., LTD.
    Inventors: Cheng-Feng Lin, I-Wei Lai, Ming-Ta Chou
  • Patent number: 10229704
    Abstract: Devices having air bearing surfaces (ABS), the devices including a near field transducer (NFT) that includes a disc configured to convert photons incident thereon into plasmons; and a peg configured to couple plasmons coupled from the disc into an adjacent magnetic storage medium, wherein at least one of a portion of the peg, a portion of the disc, or a portion of both the peg and the disc include a multilayer structure including at least two layers including at least one layer of a first material and at least one layer of a second material, wherein the first material and the second material are not the same and wherein the first and the second materials independently include aluminum (Al), antimony (Sb), bismuth (Bi), boron (B), barium (Ba), calcium (Ca), cerium (Ce), chromium (Cr), cobalt (Co), copper (Cu), erbium (Er), gadolinium (Gd), gallium (Ga), germanium (Ge), gold (Au), hafnium (Hf), indium (In), iridium (Ir), iron (Fe), lanthanum (La), magnesium (Mg), manganese (Mn), molybdenum (Mo), nickel (Ni), ni
    Type: Grant
    Filed: June 5, 2017
    Date of Patent: March 12, 2019
    Assignee: Seagate Technology LLC
    Inventors: Martin Blaber, Tong Zhao, Justin Brons, Michael Kautzky
  • Patent number: 10192577
    Abstract: An apparatus comprises a slider having a media-facing surface and that is configured for heat-assisted magnetic recording. The slider comprises a write pole, a heatsink layer, and a diffusing metal. The write pole includes two or more sides extending into the slider and a pole tip at the media-facing surface. The heatsink layer is proximate at least part of the two or more sides of the write pole, and a first portion of the heatsink layer is proximate the pole tip. The diffusing metal is disposed proximate the write pole.
    Type: Grant
    Filed: December 8, 2017
    Date of Patent: January 29, 2019
    Assignee: Seagate Technology LLC
    Inventors: Peter Kevin McGeehin, Mark Anthony Gubbins
  • Patent number: 10186292
    Abstract: A recording head has a waveguide core layer that delivers light from a light source to a region proximate a magnetic write pole. A near-field transducer is formed of a thin film of Rh or Ir deposited over the waveguide core layer. The near-field transducer includes an enlarged part with two straight edges facing a media-facing surface and at obtuse angles relative to the media-facing surface. A peg extends from the enlarged part towards the media-facing surface. The waveguide core layer has a terminating end with terminating edges that align with the two straight edges of the near-field transducer.
    Type: Grant
    Filed: April 30, 2018
    Date of Patent: January 22, 2019
    Assignee: Seagate Technology LLC
    Inventors: Vivek Krishnamurthy, Tae-Woo Lee, Michael Allen Seigler, Peng Zhang
  • Patent number: 10170145
    Abstract: A magnetic recording medium is provided that includes, in the order recited, a substrate; a first seed layer; a second seed layer containing ZnO; a third seed layer containing MgO; and a magnetic recording layer containing an ordered alloy. The first seed layer contains Ru and at least one material selected from the group consisting of oxides, carbides, and nitrides. Employing seed layers enables the magnetic recording medium to be a perpendicular magnetic recording medium by having the magnetic recording layer contain an ordered alloy suitable for perpendicular magnetic recording. Recording density is improved thereby while ensuring required thermal stability. Further, the invention achieves an increased thickness of the magnetic layer and a reduced grain size.
    Type: Grant
    Filed: December 28, 2017
    Date of Patent: January 1, 2019
    Assignee: FUJI ELECTRIC CO., LTD.
    Inventors: Shinji Uchida, Hitoshi Nakata, Tomohiro Moriya, Akira Furuta, Hirohisa Oyama, Takehito Shimatsu
  • Patent number: 10163554
    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: January 22, 2015
    Date of Patent: December 25, 2018
    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: 10127931
    Abstract: According to one embodiment, a magnetic recording and reproducing device includes a magnetic recording medium, a magnetic head, and a controller. The controller implements a first operation and a second operation. The first operation is implemented in a first information recording interval including a first recording interval and a first non-recording interval. The second operation is implemented in a second information recording interval including a second recording interval and a second non-recording interval. The first operation includes in the first recording interval, generating a first signal magnetic field from the magnetic head, and in the first non-recording interval, generating a first non-signal magnetic field from the magnetic head. The second operation includes in the second recording interval, generating a second signal magnetic field from the magnetic head, and in the second non-recording interval, generating a second non-signal magnetic field from the magnetic head.
    Type: Grant
    Filed: September 15, 2016
    Date of Patent: November 13, 2018
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Hirofumi Suto, Kiwamu Kudo, Tazumi Nagasawa, Taro Kanao, Rie Sato, Koichi Mizushima
  • Patent number: 10127935
    Abstract: An apparatus includes a slider configured for heat-assisted magnetic recording. An input coupler of the slider is configured to-receive light produced by a light source. A waveguide of the slider comprises a waveguide core tapering from a first portion having a first cross sectional width to a second portion having a second cross sectional width along the light propagation direction. The second cross sectional width being smaller than the first cross sectional width, and the second portion having an output end. The waveguide includes at least one cladding layer comprising a metallic material. The at least one cladding layer surrounds at least the core. The at least one cladding layer is configured to sink heat away from the waveguide core. The waveguide is configured to provide a surface plasmon-enhanced near-field radiation pattern proximate the output end in response to the light received at the transducer region.
    Type: Grant
    Filed: October 16, 2017
    Date of Patent: November 13, 2018
    Assignee: Seagate Technology LLC
    Inventors: Roberto Fernandez Garcia, Andres David Barbosa Neira, Michael James Hardy, Mark Anthony Gubbins
  • Patent number: 10115415
    Abstract: A magnetic pulse recording method is disclosed wherein a magnetic field is turned off for a portion (tOFF) of a bit duration before or after total recording time is completed for each bit. Typical bit lengths of 10 nm to 50 nm must be less than the main pole down-track length, and total recording time (tREC) must be less than the bit duration such that bit duration equals (tREC+tOFF). In a random bit sequence, tREC may be maintained for each bit while tOFF increases as bit duration increases. The method applies to mobile hard disk drives (HDD) with 2.5 inch disks, and to nearline HDD with 3.5 inch disks where bit durations vary from 0.3 to 1.2 ns for recording velocities between 10 and 47 m/sec. The time required to turn off the field may be <10 picoseconds, and comprise a linear or non-linear waveform.
    Type: Grant
    Filed: March 23, 2018
    Date of Patent: October 30, 2018
    Assignee: Headway Technologies, Inc.
    Inventors: Yuhui Tang, Ying Liu
  • Patent number: 10079032
    Abstract: A combination of a semiconductor member and a metal member is selected appropriately from a view point of increasing an enhancement factor of a near-field light. A device (1) has a semiconductor member (101) and a metal member (102), a near-field light is generated at the metal member when an energy is supplied to the semiconductor member, the metal member is made of an alloy including a first metal and a second metal, a condition of Rm1<Rs<Rm2 is satisfied, wherein a resonance wavelength of the first metal is Rm1, a resonance wavelength of the second metal is Rm2, and a resonance wavelength of the semiconductor member is Rs.
    Type: Grant
    Filed: June 6, 2014
    Date of Patent: September 18, 2018
    Assignees: INNOVASTELLA CO., LTD, SCHOOL JURIDICAL PERSON OF FUKUOKA KOGYO DAIGAKU
    Inventors: Ryuichi Katayama, Katsumi Yoshizawa, Satoshi Sugiura, Takayuki Kasuya
  • Patent number: 10037771
    Abstract: Devices having air bearing surfaces (ABS), the devices include a near field transducer (NFT) that includes a disc configured to convert photons incident thereon into plasmons; and a peg configured to couple plasmons coupled from the disc into an adjacent magnetic storage medium, wherein the disc includes a disc material and the peg includes a peg material, wherein the disc material is different from the peg material and wherein the disc material has a first real part of the permittivity and a peg material has a second real part of the permittivity and the second real part of the permittivity is not greater than the first real part of the permittivity.
    Type: Grant
    Filed: July 31, 2017
    Date of Patent: July 31, 2018
    Assignee: Seagate Technology LLC
    Inventors: Martin Blaber, Michael A. Seigler, Michael C. Kautzky, Tong Zhao, Justin Brons, John C. Duda, Yuhang Cheng
  • Patent number: 10014009
    Abstract: According to one embodiment, a magnetic disk drive records and reproduces referential data and measures a referential characteristic value in a state in which supply of a STO voltage is stopped, executes control of reducing a temperature set value of a heater at a recording operation, based on the referential characteristic value, records and reproduces corrected data and measuring a corrected characteristic value in a state of supplying the STO voltage with a polarity opposite to a polarity at a general operation, while varying the temperature set value at a recording operation, compares the referential characteristic value with the corrected characteristic value and obtaining a difference, and corrects the temperature set value based on the difference.
    Type: Grant
    Filed: January 31, 2018
    Date of Patent: July 3, 2018
    Assignees: Kabushiki Kaisha Toshiba, Toshiba Electronic Devices & Storage Corporation
    Inventor: Gaku Koizumi
  • Patent number: 9990947
    Abstract: A slider of a heat-assisted recording head comprises electrical bond pads coupled to bias sources and a ground pad, an air bearing surface, and a waveguide configured to receive light from a laser source. A contact sensor proximate the air bearing surface is coupled between a first bond pad and a second bond pad. A bolometer is coupled to a reference thermal sensor. The bolometer is situated at a slider location that receives at least some of the light communicated along the waveguide. The reference thermal sensor is situated at a slider location unexposed to the light communicated along the waveguide. The bolometer and reference thermal sensor are coupled between the first and second bond pads and in parallel with the contact sensor. A ground connection is coupled to the ground pad and at a connection between the bolometer and the reference thermal sensor.
    Type: Grant
    Filed: October 20, 2017
    Date of Patent: June 5, 2018
    Assignee: Seagate Technology LLC
    Inventors: Declan Macken, Jon Karsten Klarqvist
  • Patent number: 9966100
    Abstract: Before writing to a heat-assisted magnetic recording medium, a DC signal modulated with an AC signal is applied to a laser of a read/write head. A modulation level of an optical power sensor is measured, the optical power sensor being coupled to detect optical output of the laser in response to the modulated current. A target value of the DC signal that causes the modulation levels to reach a predetermined value between zero and a maximum value is determined and used to set a bias current for subsequent activation of the laser based.
    Type: Grant
    Filed: August 8, 2017
    Date of Patent: May 8, 2018
    Assignee: Seagate Technology LLC
    Inventors: Tim Rausch, Edward Charles Gage, Joshua Ward Christensen, Todd Michael Lammers
  • Patent number: 9959893
    Abstract: An apparatus comprises a slider having an air bearing surface (ABS) and a near-field transducer (NFT) at or near the ABS. An optical waveguide is configured to couple light from a laser source to the NFT. A resistive sensor comprises an ABS section situated at or proximate the ABS and a distal section extending away from the ABS to a location at least lateral of or behind the NFT. The resistive sensor is configured to detect changes in output optical power of the laser source and contact between the slider and a magnetic recording medium.
    Type: Grant
    Filed: July 24, 2017
    Date of Patent: May 1, 2018
    Assignee: Seagate Technology LLC
    Inventors: John Charles Duda, Zoran Jandric
  • Patent number: 9928863
    Abstract: A magnetic disk device includes a magnetic disk, a head slider and a control circuit. The head slider includes a read element, a write element, a first heater and a second heater. The first heater is arranged nearer to the read element than the write element. The second heater is arranged nearer to the write element than to the read element. The control circuit controls a ratio of powers to be supplied to the first heater and the second heater to adjust a first spacing between the read element and the magnetic disk and a second spacing between the write element and the magnetic disk.
    Type: Grant
    Filed: March 3, 2017
    Date of Patent: March 27, 2018
    Assignee: Kabushiki Kaisha Toshiba
    Inventor: Hiroaki Sato
  • Patent number: 9928859
    Abstract: Methods of forming a NFT the methods including forming a hard mask positioned over at least a portion of the rod, the hard mask including at least one layer; patterning a resist mask over the hard mask, the resist mask having an edge positioned over at least a portion of the rod; etching a portion of the hard mask to expose a back edge of the rod and to form a back edge of the hard mask, wherein the back edge of the rod is equivalent to the back edge of the peg; and wherein a forward portion of the rod which is the portion of the rod forward of the back edge is covered by the hard mask; forming a disc mask including a void configured to form a disc of a NFT, the disc mask being formed over at least a portion of the hard mask so that the exposed back edge of the rod is within the void configured to form the disc; etching an area exposed in the void of the disc mask to remove both a rear portion of the rod and the surrounding dielectric up to the back edge of the hard mask edge; depositing a disc material in th
    Type: Grant
    Filed: April 7, 2017
    Date of Patent: March 27, 2018
    Assignee: Seagate Technology LLC
    Inventors: Michael C. Kautzky, Mark H. Ostrowski, David Michael Grundman, Martin Blaber
  • Patent number: 9923137
    Abstract: A device and a method of forming a device are presented. A substrate is provided. The substrate includes circuit component formed on a substrate surface. Back end of line processing is performed to form an upper inter level dielectric (ILD) layer over the substrate. The upper ILD layer includes a plurality of ILD levels. A magnetic tunneling junction (MTJ) stack is formed in between adjacent ILD levels of the upper ILD layer. The MTJ stack comprises a free layer, a tunneling barrier layer and a fixed layer. The fixed layer includes a polarizer layer, a composite texture breaking layer which includes a ruthenium layer and a synthetic antiferromagnetic (SAF) layer.
    Type: Grant
    Filed: March 4, 2016
    Date of Patent: March 20, 2018
    Assignee: GLOBALFOUNDRIES SINGAPORE PTE. LTD.
    Inventors: Taiebeh Tahmasebi, Kangho Lee, Vinayak Bharat Naik
  • Patent number: 9916851
    Abstract: Embodiments described herein involve a method comprising generating a seek command in a heat-assisted magnetic recording (HAMR) device. A first current is supplied to a laser diode of the HAMR device in response to the seek command to preheat the laser diode. The first current is insufficient to cause erasure of data on media of the HAMR device. A second current that is greater than the first current is supplied to the laser diode for writing to a magnetic recording medium of the HAMR device after executing the seek command. Preheating the laser diode reduces a likelihood of a laser mode hop occurring while writing to the medium.
    Type: Grant
    Filed: May 30, 2017
    Date of Patent: March 13, 2018
    Assignee: SEAGATE TECHNOLOGY LLC
    Inventors: Michael Allen Seigler, Zoran Jandric, Tae-Woo Lee
  • Patent number: 9870787
    Abstract: A slider configured for heat-assisted magnetic recording has an upper surface, an opposing air bearing surface (ABS), and a body defined between the upper surface and the ABS. The slider comprises a write pole and a near-field transducer (NFT) at or near the ABS. An optical waveguide is configured to receive light from a laser source and comprises a first cladding layer, a second cladding layer, and a core between the first and second cladding layers. The core has a width, a length, and a longitudinal axis oriented along the length of the core. A bolometer is situated within the body of the slider at a location that receives at least some of the light communicated along the waveguide used during a writing operation. The bolometer is spaced apart from the core and comprises a longitudinal axis that is oriented substantially parallel to the longitudinal axis of the core.
    Type: Grant
    Filed: April 19, 2017
    Date of Patent: January 16, 2018
    Assignee: SEAGATE TECHNOLOGY LLC
    Inventors: James Gary Wessel, Chen Wang
  • Patent number: 9858950
    Abstract: A method and apparatus for increasing storage capacity on magnetic media. A dual-layer magnetic recording apparatus receives, a write operation instruction, bit position and bit value where the bit position includes a media surface position and magnetic media layer identifier. The dual-layer magnetic recording apparatus accesses a dual-layer magnetic media where the dual-layer magnetic media includes a first magnetic media layer with a thermally controllable coercivity, a second magnetic media layer and a separation layer. The magnetic layer identifier is determined to associated with be the first magnetic media layer or the second magnetic media layer. When the magnetic layer identifier is the second magnetic media layer, the bit value is written based on magnetically charging the second magnetic media layer and when the magnetic layer identifier is the first magnetic media layer the bit value is written based on heating and magnetically charging the first magnetic media layer.
    Type: Grant
    Filed: October 26, 2016
    Date of Patent: January 2, 2018
    Assignee: International Business Machines Corporation
    Inventors: Thomas Bueck, Michael Diederich, Thorsten Muehge, Erik Rueger
  • Patent number: 9852749
    Abstract: An apparatus, according to one embodiment, comprises a near field transducer; an adhesion layer on a media facing side of the near field transducer, the adhesion layer comprising Ni and Cr; and a protective layer on a media facing side of the adhesion layer. Other apparatuses, systems and methods are described in additional embodiments.
    Type: Grant
    Filed: March 15, 2017
    Date of Patent: December 26, 2017
    Assignee: WESTERN DIGITAL TECHNOLOGIES, INC.
    Inventors: Xiaoping Bian, Qing Dai, Alan C. Lam, Barry C. Stipe
  • Patent number: 9842616
    Abstract: Provided herein is an apparatus including a head over-coat and a depleted region in the head over-coat. A media over-coat is deposited in the depleted region. A near field transducer is adjacent to the head over-coat, wherein the near field transducer combusts the deposited media over-coat.
    Type: Grant
    Filed: October 24, 2016
    Date of Patent: December 12, 2017
    Assignee: Segate Technology LLC
    Inventors: Florin Zavaliche, Paul M. Jones, Jan-Ulrich Thiele, ZhaoHui Fan, Bing Zhang, Emil John C. Esmenda, XiaoPing Yan, Xiaoding Ma, Fujian Huang, Huan Tang
  • Patent number: 9824705
    Abstract: A slider of a heat-assisted recording head comprises electrical bond pads coupled to bias sources and a ground pad, an air bearing surface, and a waveguide configured to receive light from a laser source. A contact sensor proximate the air bearing surface is coupled between a first bond pad and a second bond pad. A bolometer is coupled to a reference thermal sensor. The bolometer is situated at a slider location that receives at least some of the light communicated along the waveguide. The reference thermal sensor is situated at a slider location unexposed to the light communicated along the waveguide. The bolometer and reference thermal sensor are coupled between the first and second bond pads and in parallel with the contact sensor. A ground connection is coupled to the ground pad and at a connection between the bolometer and the reference thermal sensor.
    Type: Grant
    Filed: December 6, 2016
    Date of Patent: November 21, 2017
    Assignee: SEAGATE TECHNOLOGY LLC
    Inventors: Declan Macken, Jon Karsten Klarqvist
  • Patent number: 9799359
    Abstract: A recording head includes a layer of plasmonic metal deposited on a surface of the recording head. One or more non-self-supporting layers of crystalline material are attached to the plasmonic metal, the one or more layers of crystalline materials configured to form an active region of a laser. A waveguide is configured to receive plasmons from the laser and direct the plasmons to a recording medium.
    Type: Grant
    Filed: March 21, 2017
    Date of Patent: October 24, 2017
    Assignee: SEAGATE TECHNOLOGY LLC
    Inventors: Scott Eugene Olson, Karim Tatah, Yi-Kuei Ryan Wu, Mark Anthony Gubbins, Marcus B. Mooney, Michael James Hardy
  • Patent number: 9773603
    Abstract: A method of magnetization reversal, time stable ferrimagnetic material, a product and a domain comprising said material, a system for magnetization reversal, and information storage. Therein, a ferrimagnetic material is one in which magnetic moments of the atoms on different sublattices are opposed, as in antiferromagnetism; however, in ferrimagnetic materials, the opposing moments are unequal and a spontaneous magnetization remains.
    Type: Grant
    Filed: June 23, 2014
    Date of Patent: September 26, 2017
    Assignee: RADBOUD UNIVERSITEIT NIJMEGEN
    Inventors: Theodorus Henricus Maria Rasing, Johan Mentink, Andrei Kirilyuk, Alexey Kimel, Richard Francis Llewelyn Evans, Roy William Chantrell, Thomas Andrew Ostler, Joseph Barker
  • Patent number: 9741374
    Abstract: A head includes a head body having a medium facing surface, and a protective film covering the medium facing surface. The head body includes a main pole, a waveguide, a plasmon generator, and a main light-blocking section. The waveguide has an entrance end face and an exit end face. The plasmon generator has a near-field light generating surface. The medium facing surface includes a first region including neither of the exit end face and the near-field light generating surface, and a second region including the exit end face and the near-field light generating surface. The protective film includes a first portion covering the first region, and a second portion covering the second region. The main light-blocking section is located to intersect an imaginary straight line connecting the entrance end face and the first region.
    Type: Grant
    Filed: December 14, 2016
    Date of Patent: August 22, 2017
    Assignee: TDK CORPORATION
    Inventors: Makoto Isogai, Masahiro Saito
  • Patent number: 9721593
    Abstract: Devices having air bearing surfaces (ABS), the devices include a near field transducer (NFT) that includes a disc configured to convert photons incident thereon into plasmons; and a peg configured to couple plasmons coupled from the disc into an adjacent magnetic storage medium, wherein the disc includes a disc material and the peg includes a peg material, wherein the disc material is different from the peg material and wherein the disc material has a first real part of the permittivity and a peg material has a second real part of the permittivity and the second real part of the permittivity is not greater than the first real part of the permittivity.
    Type: Grant
    Filed: May 27, 2016
    Date of Patent: August 1, 2017
    Assignee: Seagate Technology LLC
    Inventors: Martin Blaber, Michael A. Seigler, Michael C. Kautzky, Tong Zhao, Justin Brons, John C. Duda, Yuhang Cheng
  • Patent number: 9675252
    Abstract: Scanning mechanisms that have application in confocal imaging use electromagnetic actuation to move elements in an optical system. An objective lens mounted to a flexure comprising a magnetic material is actuated in the axial direction by an electromagnet coil. An optical path may pass through the coil. Scanning in transverse directions may be provided using magnetically actuated flexible beams which move the tip of an optical fiber or other pinhole in one or more transverse directions. Actuators may be actuated using driving currents that include an AC component and a DC bias component. The scanning mechanisms may be miniaturized and may be constructed to provide real-time imaging.
    Type: Grant
    Filed: September 27, 2012
    Date of Patent: June 13, 2017
    Assignees: British Columbia Cancer Agency Branch, The University of British Colombia
    Inventors: Hadi Mansoor, Haishan Zeng, Mu Chiao, Keqin Chen
  • Patent number: 9672848
    Abstract: Devices having air bearing surfaces (ABS), the devices including a near field transducer (NFT) that includes a disc configured to convert photons incident thereon into plasmons; and a peg configured to couple plasmons coupled from the disc into an adjacent magnetic storage medium, wherein at least one of a portion of the peg, a portion of the disc, or a portion of both the peg and the disc include a multilayer structure including at least two layers including at least one layer of a first material and at least one layer of a second material, wherein the first material and the second material are not the same and wherein the first and the second materials independently include aluminum (Al), antimony (Sb), bismuth (Bi), boron (B), barium (Ba), calcium (Ca), cerium (Ce), chromium (Cr), cobalt (Co), copper (Cu), erbium (Er), gadolinium (Gd), gallium (Ga), germanium (Ge), gold (Au), hafnium (Hf), indium (In), iridium (Ir), iron (Fe), lanthanum (La), magnesium (Mg), manganese (Mn), molybdenum (Mo), nickel (Ni), ni
    Type: Grant
    Filed: May 27, 2016
    Date of Patent: June 6, 2017
    Assignee: Seagate Technology LLC
    Inventors: Martin Blaber, Tong Zhao, Justin Brons, Michael Kautzky
  • Patent number: 9659591
    Abstract: A recording head includes a near-field transducer located an oblique angle to a media-facing surface. The near-field transducer includes an enlarged portion and a peg extending from the enlarged portion towards the media-facing surface at a normal angle. An input waveguide of the recording head receives energy from an energy source, and an output waveguide delivers the energy to near-field transducer at the oblique angle. The output waveguide is oriented at the oblique angle. A bent waveguide with a polynomial spiral shape joins the input waveguide and the output waveguide.
    Type: Grant
    Filed: January 14, 2016
    Date of Patent: May 23, 2017
    Assignee: SEAGATE TECHNOLOGY LLC
    Inventor: Chubing Peng
  • Patent number: 9620152
    Abstract: Methods of forming a NFT the methods including forming a hard mask positioned over at least a portion of the rod, the hard mask including at least one layer; patterning a resist mask over the hard mask, the resist mask having an edge positioned over at least a portion of the rod; etching a portion of the hard mask to expose a back edge of the rod and to form a back edge of the hard mask, wherein the back edge of the rod is equivalent to the back edge of the peg; and wherein a forward portion of the rod which is the portion of the rod forward of the back edge is covered by the hard mask; forming a disc mask including a void configured to form a disc of a NFT, the disc mask being formed over at least a portion of the hard mask so that the exposed back edge of the rod is within the void configured to form the disc; etching an area exposed in the void of the disc mask to remove both a rear portion of the rod and the surrounding dielectric up to the back edge of the hard mask edge; depositing a disc material in th
    Type: Grant
    Filed: May 27, 2016
    Date of Patent: April 11, 2017
    Assignee: Seagate Technology LLC
    Inventors: Michael C. Kautzky, Mark H. Ostrowski, David Michael Grundman, Martin Blaber
  • Patent number: 9601144
    Abstract: A heat-assisted magnetic recording (HAMR) disk drive has a disk with at least two independent data layers (RL1 and RL2), each data layer storing an independent data stream. At a high laser power both RL1 and RL2 are heated to above their respective Curie temperatures and a first data stream is recorded in both RL1 and RL2. At a lower laser power only upper RL2 is heated to above its Curie temperature and a second data stream is recorded only in RL2. The data layers are separated by a nonmagnetic spacer layer (SL) that prevents lower RL1 from being heated to above its Curie temperature at low laser power. The first and second data streams are typically asynchronous. Recorded data is read back from both data streams simultaneously as a composite readback signal. A joint Viterbi detector detects the asynchronous data streams simultaneously from the composite readback signal.
    Type: Grant
    Filed: May 25, 2016
    Date of Patent: March 21, 2017
    Assignee: HGST Netherlands B.V.
    Inventors: Virat Vasav Mehta, James William Reiner, Michael Paul Salo, Roger William Wood
  • Patent number: 9558773
    Abstract: An apparatus includes a slider body of a disk drive. The slider body is electrically coupled to a plurality of end bond pads. A voltage applied to one more of the end bond pads sets a surface potential of the slider body.
    Type: Grant
    Filed: December 4, 2014
    Date of Patent: January 31, 2017
    Assignee: SEAGATE TECHNOLOGY LLC
    Inventors: Daniel W. Olson, Declan Macken, Timothy William Stoebe
  • Patent number: 9542969
    Abstract: When a simple magnification optical system is used in reproduction of a recording medium in which a large number of minute modified regions are three-dimensionally formed inside solid matter, contrast is insufficient and interlayer crosstalk is increased, and therefore, it is impossible to take a sufficient S/N ratio. Provided is a recording medium in which at least one layer is configured by a set of two adjacent sub-layers, and dots on a sub-layer correspond to a recording data ‘1’ and dots on the other sub-layer correspond to ‘0’. These data are played back.
    Type: Grant
    Filed: May 28, 2012
    Date of Patent: January 10, 2017
    Assignee: Hitachi, Ltd.
    Inventors: Takao Watanabe, Manabu Shiozawa, Koichi Watanabe, Shigeharu Kimura
  • Patent number: 9515251
    Abstract: A mechanism is provided for fabricating a thermally assisted magnetoresistive random access memory device. A bottom thermal barrier is formed on a bottom contact. A magnetic tunnel junction is formed on the bottom thermal barrier. The magnetic tunnel junction includes a top ferromagnetic layer formed on a tunnel barrier. The tunnel barrier is formed on a bottom ferromagnetic layer. A top thermal barrier is formed on the top ferromagnetic layer. A top contact is formed on the top thermal barrier. The top contact is reduced to a first diameter. The tunnel barrier and the bottom ferromagnetic layer each have a second diameter. The first diameter of the top contact is smaller than the second diameter.
    Type: Grant
    Filed: December 29, 2014
    Date of Patent: December 6, 2016
    Assignees: INTERNATIONAL BUSINESS MACHINES CORPORATION, CROCUS TECHNOLOGY SA
    Inventors: Anthony J. Annunziata, Lucian Prejbeanu, Philip L. Trouilloud, Daniel C. Worledge
  • Patent number: 9495995
    Abstract: A relatively larger nominal track spacing associated with a first write head is determined and a relatively smaller nominal track spacing associated with a second write head is determined. The first and second write heads simultaneously write to respective different first and second surfaces of a heat-assisted recording medium. A laser write power for a selected one of the first write head and the second write head is changed to enable the first write head and the second write head to operate at an equivalent nominal track spacing.
    Type: Grant
    Filed: August 25, 2015
    Date of Patent: November 15, 2016
    Assignee: SEAGATE TECHNOLOGY LLC
    Inventors: Wenzhong Zhu, Kenneth Haapala, Jon Trantham, Edward Charles Gage
  • Patent number: 9489973
    Abstract: Acoustically assisted magnetic recording can be used in a hard disk drive or a solid state medium. In the described embodiments, otherwise unwriteable high-coercivity media are made amenable to recording by lowering their coercivity via strain induced by acoustic waves. The use of acoustic waves temporarily and locally reduces the magnetic field required to record information on a magnetic recording medium. The process makes use of the magnetostrictive property of a magnetic material by which the magnetic anisotropy of the material is changed by strain. The result of such a change is a reduction in the coercive field, i.e., the magnetic field required to reverse the magnetization direction. Because acoustic waves cause strain, the passage of an acoustic wave through a magnetic material can be used to reduce its coercive field.
    Type: Grant
    Filed: February 13, 2014
    Date of Patent: November 8, 2016
    Assignee: Oregon State University
    Inventors: Pallavi Dhagat-Jander, Albrecht Jander
  • Patent number: 9472217
    Abstract: A crystal film with one or more nitrogen vacancy centers is placed in close proximity to a recording head. A magnetic field or heat produced by the recording head as well as excitation illumination and an excitation field is applied to the crystal film. The magnetic field produced by the recording head, the heat produced by a thermal device on the recording head, and/or the excitation field may be varied. A confocal microscope or wide-field microscope optically detects a decrease in a spin dependent photoluminescence in response to the magnetic field or heat, excitation field and excitation illumination caused by electron spin resonance (ESR) of the at least one nitrogen vacancy center to measure Optically Detected Spin Resonance (ODMR). A characteristic of the recording head is determined using the ODMR.
    Type: Grant
    Filed: November 4, 2014
    Date of Patent: October 18, 2016
    Assignee: Infinitum Solutions, Inc.
    Inventor: Juergen Heidmann
  • Patent number: 9460746
    Abstract: An air-bearing surface of a slider is coated with a photoresist having a high optical absorbance at or near an operational wavelength of the slider. Light is directed at a target wavelength through an entry of a waveguide integrated into the slider. The light exiting the waveguide forms a feature through the photoresist, the feature proximate a near-field transducer of the slider. A sub-micron pattern is formed using the feature.
    Type: Grant
    Filed: May 28, 2015
    Date of Patent: October 4, 2016
    Assignee: SEAGATE TECHNOLOGY LLC
    Inventors: Daniel Richard Buettner, Joseph Michael Stephan, Douglas Hampton Cole, The Ngoc Nguyen
  • Patent number: 9454986
    Abstract: A light source is configured to produce light, a waveguide is optically coupled to the light source and configured to direct the light to an intended focus location, and a slider is configured to use the light as an energy source for heating a region of a magnetic recording medium. A thermal sensor is situated on the slider at a location outside of a light path that includes the intended focus location. The thermal sensor is configured for sensing a short time constant change in temperature resulting from light source heating of the thermal sensor, wherein the sensed change in thermal sensor temperature is representative of optical intensity of the light delivered to the intended focus location.
    Type: Grant
    Filed: August 24, 2015
    Date of Patent: September 27, 2016
    Assignee: SEAGATE TECHNOLOGY LLC
    Inventors: Michael Thomas Johnson, Manuel Charles Anaya-Dufresne, Zoran Jandric