Near Field Optic Patents (Class 369/13.33)
  • Patent number: 10519540
    Abstract: Devices having an air bearing surface (ABS), the device including a near field transducer, the near field transducer having a peg and a disc, the peg having a region adjacent the ABS, the peg including a plasmonic material selected from gold (Au), silver (Ag), copper (Cu), ruthenium (Ru), rhodium (Rh), aluminum (Al), or combinations thereof; and at least one other secondary atom selected from germanium (Ge), tellurium (Te), aluminum (Al), antimony (Sb), tin (Sn), mercury (Hg), indium (In), zinc (Zn), iron (Fe), copper (Cu), manganese (Mn), silver (Ag), chromium (Cr), cobalt (Co), and combinations thereof, wherein a concentration of the secondary atom is higher at the region of the peg adjacent the ABS than a concentration of the secondary atom throughout the bulk of the peg. Methods of forming NFTs are also disclosed.
    Type: Grant
    Filed: January 29, 2019
    Date of Patent: December 31, 2019
    Assignee: Seagate Technology LLC
    Inventors: Tong Zhao, Michael C. Kautzky, Sarbeswar Sahoo, Justin Brons, Jie Gong, Yuhang Cheng
  • Patent number: 10510364
    Abstract: Devices that include a near field transducer (NFT) including a crystalline plasmonic material having crystal grains and grain boundaries; and nanoparticles disposed in the crystal grains, on the grain boundaries, or some combination thereof, wherein the nanoparticles are oxides of, lanthanum (La), barium (Ba), strontium (Sr), erbium (Er), hafnium (Hf), germanium (Ge), or combinations thereof; nitrides of zirconium (Zr), niobium (Nb), or combinations thereof; or carbides of silicon (Si), aluminum (Al), boron (B), zirconium (Zr), tungsten (W), titanium (Ti), niobium (Nb), or combinations thereof.
    Type: Grant
    Filed: November 9, 2015
    Date of Patent: December 17, 2019
    Assignee: Seagate Technology LLC
    Inventors: Tong Zhao, Justin Brons, Steven C. Riemer, Michael C. Kautzky, Xiaoyue Huang, Sarbeswar Sahoo
  • Patent number: 10510365
    Abstract: A recording head includes a near-field transducer proximate a media-facing surface. The near-field transducer comprises an aperture portion surrounded by walls of plasmonic material, the walls oriented normal to the media-facing surface. A notch protrudes within the aperture. The notch comprises at least one of Rh and Ir. A write pole is proximate the near-field transducer. The write pole has a back surface facing away from the media-facing surface and an aperture-facing surface proximate the aperture.
    Type: Grant
    Filed: March 14, 2019
    Date of Patent: December 17, 2019
    Assignee: Seagate Technology LLC
    Inventors: Martin Giles Blaber, Michael Allen Seigler, Michael Christopher Kautzky
  • Patent number: 10490214
    Abstract: An apparatus comprises a write pole, a waveguide core, and a near-field transducer (NFT) positioned between the write pole and the waveguide core. The NFT comprises an enlarged portion and a peg comprising a refractory metal and extending from the enlarged portion toward a media-facing surface. A first dielectric layer is positioned between the peg and the write pole, and a first adhesion layer is positioned between the peg and the first dielectric layer. In addition, a second dielectric layer is disposed on an entire surface of the NFT opposing the media-facing surface, and a second adhesion layer is positioned between the NFT and the second dielectric layer.
    Type: Grant
    Filed: August 3, 2018
    Date of Patent: November 26, 2019
    Assignee: Seagate Technology LLC
    Inventor: Weibin Chen
  • Patent number: 10482908
    Abstract: An apparatus comprises a laser diode configured to generate light during a write operation. A slider comprises a near-field transducer (NFT) and an optical waveguide. The slider is configured for heat-assisted magnetic recording and to communicate the light to the NFT via the waveguide. A writer heater of the slider is configured to receive power during the write operation. A thermal sensor is situated at or near an air bearing surface of the slider. The thermal sensor is configured to produce a sensor signal in response to sensing back-heating from the medium while the NFT generates heat during a write operation. Circuitry, coupled to the thermal sensor, is configured to compare the sensor signal to a threshold and generate an output signal indicative of degradation of NFT performance in response to the sensor signal exceeding the threshold.
    Type: Grant
    Filed: November 16, 2018
    Date of Patent: November 19, 2019
    Assignee: Seagate Technology LLC
    Inventors: Riyan Mendonsa, Jon D. Trantham, James Dillon Kiely, Peng Li, Joshua Ward Christensen
  • Patent number: 10438617
    Abstract: A magnetic write head for heat assisted magnetic recording having a novel heat sink structure. The write head includes a magnetic write pole and a thermal transducer located adjacent to a leading edge of the magnetic write pole. A heat sink structure, constructed of a non-magnetic, thermally conductive material such as Au, Ag or Cu partially surrounds the magnetic write pole. The heat sink structure can be formed to contact first and second sides of the magnetic write pole, and can be recessed from the media facing surface of the write head. The space between the heat sink structure and the media facing surface can be filled with a physically hard, non-corrosive metal.
    Type: Grant
    Filed: April 26, 2017
    Date of Patent: October 8, 2019
    Assignee: Western Digital Technologies, Inc.
    Inventors: Venkata R K Gorantla, Takuya Matsumoto, Aron Pentek
  • Patent number: 10410664
    Abstract: A near-field transducer has an enlarged portion with a layer of soft plasmonic material. A peg is embedded in a lower part of the enlarged portion that faces a media-facing surface. The peg has an elongated outer part that extends from a lower edge of the enlarged portion towards the media-facing surface and an embedded part that is embedded within the enlarged portion. The embedded part could be any shape. The peg is formed of a thermally robust plasmonic material.
    Type: Grant
    Filed: March 29, 2018
    Date of Patent: September 10, 2019
    Assignee: Seagate Technology LLC
    Inventors: Yuhang Cheng, Nan Zhou, Yongjun Zhao, Huaqing Yin, Weibin Chen, Michael Allen Seigler
  • Patent number: 10403315
    Abstract: Embodiments disclosed herein generally relate to a HAMR head. The HAMR head includes a main pole, a waveguide and a NFT disposed between the main pole and the waveguide. The NFT includes an antenna, and the antenna includes a first portion and a second portion. The second portion may be made of a material having a higher melting point than the material of the first portion. Having the second portion helps reduce the temperature rise of the NFT and reduce the laser power applied to the NFT.
    Type: Grant
    Filed: May 6, 2015
    Date of Patent: September 3, 2019
    Assignee: WESTERN DIGITAL TECHNOLOGIES, INC.
    Inventors: Takuya Matsumoto, Vijay Prakash Singh Rawat, Barry C. Stipe
  • Patent number: 10403310
    Abstract: An apparatus comprises a slider configured for heat-assisted magnetic recording. A near-field transducer comprising a peg is situated at or near an air bearing surface of the slider, and an optical waveguide of the slider is configured to couple light from a light source to the near-field transducer. The peg comprises a hyperbolic metamaterial, and the near-field transducer may further include an enlarged portion from which the peg extends, where the enlarged portion may also comprise a hyperbolic metamaterial.
    Type: Grant
    Filed: July 16, 2018
    Date of Patent: September 3, 2019
    Assignee: Seagate Technology LLC
    Inventors: Andres David Barbosa Neira, Roberto Fernandez Garcia, Michael James Hardy, Choon How Gan, Mark Anthony Gubbins, Florin Zavaliche, Tong Zhao, Martin Giles Blaber
  • Patent number: 10395680
    Abstract: An apparatus includes a slider having an air bearing surface (ABS). A near-field transducer (NFT) is disposed at or near the ABS. The slider has an optical waveguide configured to couple light from a laser source to the NFT. A thermal sensor is disposed at a leading edge of the NFT, the thermal sensor has an ABS section situated at or proximate the ABS and a distal section extending away from the ABS. The thermal 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: April 18, 2018
    Date of Patent: August 27, 2019
    Assignee: Seagate Technology LLC
    Inventors: James Gary Wessel, Chen Wang
  • Patent number: 10366720
    Abstract: An apparatus comprises a slider comprising an air bearing surface (ABS) and configured for heat-assisted magnetic recording. The slider includes a writer and a reader at the ABS, a near-field transducer (NFT) proximate the writer, and an optical waveguide optically coupled to a laser source and the NFT. The slider further includes a sensor configured to contact and sense thermal asperities of a magnetic recording medium. The sensor is formed from one of Ru, Rh, Pd, Os, Ir, and Pt.
    Type: Grant
    Filed: August 31, 2017
    Date of Patent: July 30, 2019
    Assignee: Seagate Technology LLC
    Inventors: Declan Macken, Paul Julio Sonda, Peter Kevin McGeehin
  • Patent number: 10249326
    Abstract: A recording head has a near-field transducer proximate a media-facing surface of the recording head. A waveguide core overlaps and delivers light from a light source to the near-field transducer. The waveguide core has a dielectric cavity proximate the near-field transducer. The cavity is filled with a cladding material and reduces optical feedback to the light source.
    Type: Grant
    Filed: January 17, 2018
    Date of Patent: April 2, 2019
    Assignee: Seagate Technology LLC
    Inventor: Chubing Peng
  • Patent number: 10240975
    Abstract: An apparatus comprises a light source configured to generate light, and a modulator coupled to the light source and configured to modulate the light above a predetermined frequency. A slider is configured for heat-assisted magnetic recording and to receive the modulated light. A resistive sensor is integral to the slider and subject to heating by absorption of electromagnetic radiation and conduction of heat. Measuring circuitry is coupled to the resistive sensor and configured to measure a response of the resistive sensor due to absorbed electromagnetic radiation and not from the heat conduction. The measuring circuitry may further be configured to determine output optical power of the light source using the measured resistive sensor response.
    Type: Grant
    Filed: June 23, 2016
    Date of Patent: March 26, 2019
    Assignee: Seagate Technology LLC
    Inventors: James Dillon Kiely, John Charles Duda, Patrick Carl Fletcher, Andrei Dorobantu, Jon D. Trantham
  • Patent number: 10236026
    Abstract: Thermal barrier layers and seed layers for control of thermal and structural properties of heat assisted magnetic recording (HAMR) media are provided. One such HAMR medium includes a substrate, a heat sink layer on the substrate, a thermal barrier layer of SrTiO3 on the heat sink layer, an underlayer of MgO on the thermal barrier layer, and a magnetic recording layer on the underlayer. Another such HAMR medium includes a substrate, a heat sink layer on the substrate, a thermal barrier layer of an ABO3-type oxide on the heat sink layer, and a magnetic recording layer on the thermal barrier layer.
    Type: Grant
    Filed: November 6, 2015
    Date of Patent: March 19, 2019
    Assignee: WD MEDIA, LLC
    Inventors: Rui Zhang, Tomoko Seki, Antony Ajan, Paul C. Dorsey
  • Patent number: 10236020
    Abstract: A recording head includes a near-field transducer proximate a media-facing surface. The near-field transducer comprises an aperture portion surrounded by walls of plasmonic material, the walls oriented normal to the media-facing surface. A notch protrudes within the aperture. The notch comprises at least one of Rh and Ir. A write pole is proximate the near-field transducer. The write pole has a back surface facing away from the media-facing surface and an aperture-facing surface proximate the aperture.
    Type: Grant
    Filed: May 15, 2018
    Date of Patent: March 19, 2019
    Assignee: Seagate Technology LLC
    Inventors: Martin Giles Blaber, Michael Allen Seigler, Michael Christopher Kautzky
  • Patent number: 10217482
    Abstract: Devices that include a near field transducer (NFT), the NFT having a disc and a peg, and the peg having five surfaces thereof; and at least one adhesion layer positioned on at least one of the five surfaces of the peg, the adhesion layer including one or more of the following: yttrium (Y), tin (Sn), iron (Fe), copper (Cu), carbon (C), holmium (Ho), gallium (Ga), silver (Ag), ytterbium (Yb), chromium (Cr), tantalum (Ta), iridium (Ir), zirconium (Zr), yttrium (Y), scandium (Sc), cobalt (Co), silicon (Si), nickel (Ni), molybdenum (Mo), niobium (Nb), palladium (Pd), titanium (Ti), rhenium (Re), osmium (Os), platinum (Pt), aluminum (Al), ruthenium (Ru), rhodium (Rh), vanadium (V), germanium (Ge), tin (Sn), magnesium (Mg), iron (Fe), copper (Cu), tungsten (W), hafnium (Hf), carbon (C), boron (B), holmium (Ho), antimony (Sb), gallium (Ga), manganese (Mn), silver (Ag), indium (In), bismuth (Bi), zinc (Zn), ytterbium (Yb), and combinations thereof.
    Type: Grant
    Filed: May 26, 2017
    Date of Patent: February 26, 2019
    Assignee: Seagate Technology LLC
    Inventors: Vijay Karthik Sankar, Tong Zhao, Yongjun Zhao, Michael C. Kautzky, Hui Brickner, Sarbeswar Sahoo
  • Patent number: 10190210
    Abstract: Devices having an air bearing surface (ABS), the device including a near field transducer, the near field transducer having a peg and a disc, the peg having a region adjacent the ABS, the peg including a plasmonic material selected from gold (Au), silver (Ag), copper (Cu), ruthenium (Ru), rhodium (Rh), aluminum (Al), or combinations thereof; and at least one other secondary atom selected from germanium (Ge), tellurium (Te), aluminum (Al), antimony (Sb), tin (Sn), mercury (Hg), indium (In), zinc (Zn), iron (Fe), copper (Cu), manganese (Mn), silver (Ag), chromium (Cr), cobalt (Co), and combinations thereof, wherein a concentration of the secondary atom is higher at the region of the peg adjacent the ABS than a concentration of the secondary atom throughout the bulk of the peg. Methods of forming NFTs are also disclosed.
    Type: Grant
    Filed: November 20, 2017
    Date of Patent: January 29, 2019
    Assignee: Seagate Technology LLC
    Inventors: Tong Zhao, Michael C. Kautzky, Sarbeswar Sahoo, Justin Brons, Jie Gong, Yuhang Cheng
  • Patent number: 10192573
    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: January 29, 2019
    Assignee: Seagate Technology LLC
    Inventors: Yuhang Cheng, Ed F. Rejda, Andrew J. Boyne, Kurt W. Wierman, Michael Seigler, Scott Franzen, Jie Gong
  • Patent number: 10152991
    Abstract: A method for manufacturing a TAMR (thermal assisted magnetic recording) write head. The write head has a metal blocker formed against a distal end of a waveguide. The waveguide focuses optical radiation on an adjacent plasmon generator where it excites plasmon modes that heat the recording medium. Although the plasmon generator typically heats the recording medium using the plasmon near field to supply the required Joule heating, an unblocked waveguide would also send optical radiation to the medium and surrounding structures producing unwanted heating and device unreliability. The role of the blocker is to block the unwanted optical radiation and, thereby, to limit the heating to that supplied by the plasmon near field.
    Type: Grant
    Filed: December 11, 2017
    Date of Patent: December 11, 2018
    Assignee: Headway Technologies, Inc.
    Inventors: Tsutomu Chou, Kouji Shimazawa, Tobias Maletzky, Weihao Xu, Shinji Hara, Yoshihiro Tsuchiya, Yiming Wang, Cherng-Chyi Han, Xuhui Jin
  • Patent number: 10147454
    Abstract: An apparatus comprises a laser diode configured to generate light during a write operation. A slider comprises a near-field transducer (NFT) and an optical waveguide. The slider is configured for heat-assisted magnetic recording and to communicate the light to the NFT via the waveguide. A writer heater of the slider is configured to receive power during the write operation. A thermal sensor is situated at or near an air bearing surface of the slider. The thermal sensor is configured to produce a sensor signal in response to sensing back-heating from the medium while the NFT generates heat during a write operation. Circuitry, coupled to the thermal sensor, is configured to compare the sensor signal to a threshold and generate an output signal indicative of degradation of NFT performance in response to the sensor signal exceeding the threshold.
    Type: Grant
    Filed: May 15, 2017
    Date of Patent: December 4, 2018
    Assignee: Seagate Technology LLC
    Inventors: Riyan Mendonsa, Jon D. Trantham, James Dillon Kiely, Peng Li, Joshua Ward Christensen
  • Patent number: 10134436
    Abstract: A method of forming a near field transducer (NFT) layer, the method including depositing a film of a primary element, the film having a film thickness and a film expanse; and implanting at least one secondary element into the primary element, wherein the NFT layer includes the film of the primary element doped with the at least one secondary element.
    Type: Grant
    Filed: January 15, 2018
    Date of Patent: November 20, 2018
    Assignee: Seagate Technology LLC
    Inventors: Sethuraman Jayashankar, Michael C. Kautzky
  • Patent number: 10121496
    Abstract: A write head includes a waveguide, a magnetic pole, and a near-field transducer. The near-field transducer includes an enlarged portion and a peg. The peg is separated from the magnetic pole in a downtrack direction by a dielectric gap. A peg coupler covers a bottom surface of the magnetic pole and is separated from the peg. The peg coupler is formed of a first plasmonic material. A pad extends from the peg coupler into part of the gap in the downtrack direction towards the peg. The pad is formed of a second plasmonic material and extends into the write head away from the media-facing surface a distance L that is less than a corresponding distance of the peg coupler.
    Type: Grant
    Filed: February 22, 2018
    Date of Patent: November 6, 2018
    Assignee: Seagate Technology LLC
    Inventors: Chubing Peng, Tae-Woo Lee, Peng Zhang, Weibin Chen
  • Patent number: 10115423
    Abstract: A near-field transducer has an enlarged portion with a peg extending towards a media-facing surface. Two reflectors are located co-planar with near-field transducer and located on either side of the near-field transducer in a crosstrack direction. The two reflectors are separated by a gap proximate the peg of the near-field transducer. The two reflectors each include a first edge at the media facing surface and a second edge at an acute angle to the media-facing surface. The second edge faces the near-field transducer. The two reflectors concentrate the light on the peg of the near-field transducer.
    Type: Grant
    Filed: October 3, 2017
    Date of Patent: October 30, 2018
    Assignee: Seagate Technology LLC
    Inventors: Mark Anthony Gubbins, Choon How Gan, Roberto Fernandez Garcia, Michael James Hardy, Andres David Barbosa Neira
  • Patent number: 10106885
    Abstract: A magnetic write apparatus includes a pole and a near field transducer. The pole extends in a yoke direction from a media facing surface where the yoke direction extends perpendicular to the media facing surface. The near field transducer includes a near field transducer cap and a near field transducer nose. The near field transducer nose is separated from the pole by the near field transducer cap and a dielectric gap and the near field transducer nose comprises a bevel surface that forms a bevel angle with a plane extending in the yoke direction.
    Type: Grant
    Filed: September 13, 2017
    Date of Patent: October 23, 2018
    Assignee: WESTERN DIGITAL (FREMONT), LLC
    Inventors: Shawn M. Tanner, Mingjun Yu, Min Zheng, Kyung Lee, Tsung Yuan Chen
  • Patent number: 10102872
    Abstract: Devices that include a near field transducer (NFT), the NFT having at least one external surface; and at least one multilayer adhesion layer positioned on at least a portion of the at least one external surface, the multilayer adhesion layer including a first layer and a second layer, with the second layer being in contact with the portion of the at least one external surface of the NFT, the first layer including: yttrium (Y), scandium (Sc), zirconium (Zr), hafnium (Hf), silicon (Si), boron (B), tantalum (Ta), barium (Ba), aluminum (Al), titanium (Ti), niobium (Nb), calcium (Ca), beryllium (Be), strontium (Sr), magnesium (Mg), lithium (Li), or combinations thereof; and the second layer including: lanthanum (La), boron (B), lutetium (Lu), aluminum (Al), deuterium (D), cerium (Ce), uranium (U), praseodymium (Pr), yttrium (Y), silicon (Si), iridium (Ir), carbon (C), thorium (Th), scandium (Sc), titanium (Ti), vanadium (V), phosphorus (P), barium (Ba), europium (Eu), or combinations thereof.
    Type: Grant
    Filed: March 17, 2016
    Date of Patent: October 16, 2018
    Assignee: Seagate Technology LLC
    Inventors: Justin Brons, Tong Zhao, Yuhang Cheng, Dimitar V. Dimitrov
  • Patent number: 10062400
    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: July 25, 2017
    Date of Patent: August 28, 2018
    Assignee: Seagate Technology LLC
    Inventors: Christopher Neil Harvey, Aidan Dominic Goggin, Kelly Elizabeth Hamilton, Reyad Mefuz
  • Patent number: 10056101
    Abstract: A slider configured for heat-assisted magnetic recording comprises a magnetic writer, a near-field transducer, and an optical waveguide coupling the near-field transducer to a light source. The writer is situated proximate the near-field transducer at an air bearing surface of the slider and comprises a first return pole, a second return pole, and a write pole situated between and spaced apart from the first return pole and the second return pole. A structural element is situated at or near the air bearing surface between the write pole and one of the first and second return poles. The structural element comprises a cavity. A thermal sensor is disposed in the cavity. The thermal sensor is configured for sensing contact between the slider and a magnetic recording medium, asperities of the medium, and output optical power of the light source.
    Type: Grant
    Filed: June 19, 2017
    Date of Patent: August 21, 2018
    Assignee: Seagate Technology LLC
    Inventor: James Gary Wessel
  • Patent number: 10043542
    Abstract: A plasmon generator generates surface plasmon and generates near-field light from the surface plasmon at a distal end surface situated on an air bearing surface facing a magnetic recording medium. The plasmon generator has a first portion including the distal end surface, a second portion situated away from the air bearing surface, and a separating layer situated between the first portion and the second portion and separating the first portion from the second portion.
    Type: Grant
    Filed: March 25, 2016
    Date of Patent: August 7, 2018
    Assignee: TDK Corporation
    Inventors: Koji Shimazawa, Tsutomu Chou, Yoshihiro Tsuchiya, Kosuke Tanaka
  • Patent number: 10043540
    Abstract: A method includes moving a heat-assisted magnetic recording head relative to a magnetic recording medium comprising a plurality of tracks, the head comprising a reader and a writer including a near-field transducer (NFT) optically coupled to a laser diode, the writer comprising a center which is laterally offset relative to a center of the reader to define a writer-reader offset (WRO) therebetween. Patterns are written to a particular track at a plurality of laser diode current levels. The patterns are read and a WRO value is calculated at a peak amplitude position for each of the laser diode current levels. A slope of the WRO values is determined with the laser current diode levels. A health condition of the NFT is determined by determining if the slope is greater than a predetermined threshold indicative of non-uniform activation across the NFT.
    Type: Grant
    Filed: August 2, 2017
    Date of Patent: August 7, 2018
    Assignee: Seagate Technology LLC
    Inventor: Won Choul Yang
  • Patent number: 10032468
    Abstract: An apparatus comprises a slider configured for heat assisted magnetic recording and comprising a substrate. At least one component of the slider generates heat when energized. At least one thermal via extends through a portion of the slider from a location proximate the component to the substrate. The thermal via is configured to conduct heat away from the component and to the substrate.
    Type: Grant
    Filed: November 7, 2016
    Date of Patent: July 24, 2018
    Assignee: Seagate Technology LLC
    Inventors: James Gary Wessel, Zoran Jandric, Vasudevan Ramaswamy
  • Patent number: 10026421
    Abstract: An apparatus comprises a slider configured for heat-assisted magnetic recording. A near-field transducer comprising a peg is situated at or near an air bearing surface of the slider, and an optical waveguide of the slider is configured to couple light from a light source to the near-field transducer. The peg comprises a hyperbolic metamaterial, and the near-field transducer may further include an enlarged portion from which the peg extends, where the enlarged portion may also comprise a hyperbolic metamaterial.
    Type: Grant
    Filed: February 21, 2017
    Date of Patent: July 17, 2018
    Assignee: Seagate Technology LLC
    Inventors: Andres David Barbosa Neira, Roberto Fernandez Garcia, Michael James Hardy, Choon How Gan, Mark Anthony Gubbins, Florin Zavaliche, Tong Zhao, Martin Giles Blaber
  • Patent number: 10014016
    Abstract: A recording head has a primary waveguide core with an input end at an input surface of the recording head and extends to a near-field transducer at a media-facing surface of the recording head. A secondary waveguide core is separated from the primary waveguide core by a gap such that light is evanescently coupled from the primary waveguide core to the secondary waveguide core. The secondary waveguide core has first and second bends such that an output end of the secondary waveguide core is parallel to and separated from the primary waveguide core in a cross-track direction. A polarization rotator rotates a polarization of light in the secondary waveguide core such that polarization-rotated light exits the secondary waveguide core at the media-facing surface.
    Type: Grant
    Filed: March 20, 2017
    Date of Patent: July 3, 2018
    Assignee: Seagate Technology LLC
    Inventors: Reyad Mehfuz, Aidan Dominic Goggin, Kelly Elizabeth Hamilton, John Bernard McGurk, Choon How Gan
  • Patent number: 9997178
    Abstract: A thermally assisted magnetic recording head includes: a main pole that has a main pole end face at an air bearing surface opposing a magnetic recording medium and emits magnetic flux from the main pole end face; a waveguide that propagates laser light as propagation light and has a first waveguide section provided with an incidence end face on which the laser light is incident, a second waveguide section provided with a waveguide end face positioned close to the main pole end face on the air bearing surface, and a third waveguide section that connects the first waveguide section to the second waveguide section; a metal layer surrounds at least a portion of the first waveguide section, the entire circumference of the second waveguide section and at least a portion of the third waveguide section.
    Type: Grant
    Filed: January 27, 2017
    Date of Patent: June 12, 2018
    Assignee: TDK Corporation
    Inventors: Yuki Nishimura, Norikazu Ota
  • Patent number: 9978412
    Abstract: A slider is configured for heat-assisted magnetic recording and comprises an NFT and a transparent thermocouple configured to produce a signal indicative of temperature at the NFT. A detector can be coupled to the thermocouple and configured to detect one or both of spacing changes and contact between the slider and a magnetic recording medium.
    Type: Grant
    Filed: October 28, 2016
    Date of Patent: May 22, 2018
    Assignee: Seagate Technology LLC
    Inventors: Declan Macken, Patrick Carl Fletcher, Song Chen
  • Patent number: 9960570
    Abstract: A slider includes a slot waveguide configured to receive energy from an input surface. The slot waveguide has first and second high-index regions surrounding a middle region that extends along a light propagation direction. The middle region has a refractive index less than that of the first and second high index regions. A near-field transducer is at an output portion of the middle region at media-facing surface. The near-field transducer has first and second plates parallel to the media-facing surface with a gap therebetween. An active laser region has a front facet optically coupled to the input surface of the slider. A reflective back facet of the laser and the near-field transducer define a single optical resonator.
    Type: Grant
    Filed: May 22, 2017
    Date of Patent: May 1, 2018
    Assignee: SEAGATE TECHNOLOGY LLC
    Inventors: Aidan Dominic Goggin, Mark Anthony Gubbins, Michael James Hardy, Kelly Elizabeth Hamilton
  • Patent number: 9958769
    Abstract: A plasmon generator including a wide portion and a narrow portion is manufactured by etching an initial plasmon generator using an etching mask. The etching mask includes a first mask layer for defining the shape of one of the narrow portion and the wide portion, and a second mask layer for defining the shape of the other of the narrow portion and the wide portion. The etching mask is formed by forming a first hard mask, a second initial mask layer and a second hard mask in this order on a first initial mask layer, and etching the first and second initial mask layers by using the first and second hard masks.
    Type: Grant
    Filed: December 21, 2016
    Date of Patent: May 1, 2018
    Assignee: HEADWAY TECHNOLOGIES, INC.
    Inventors: Hironori Araki, Yoshitaka Sasaki, Hiroyuki Ito, Seiichiro Tomita, Shigeki Tanemura, Yukinori Ikegawa
  • Patent number: 9940959
    Abstract: A method and apparatus are directed to providing relative movement between a slider configured for heat-assisted magnetic recording and a magnetic recording medium, and causing protrusion of a portion of an air bearing surface (ABS) of the slider in response to activating at least a laser source while maintaining spacing between the protrusion and the medium. A magnitude of at least a portion of the protrusion is measured while maintaining spacing between the protrusion and the medium.
    Type: Grant
    Filed: June 6, 2017
    Date of Patent: April 10, 2018
    Assignee: SEAGATE TECHNOLOGY LLC
    Inventors: Steven Douglas Granz, Michael Thomas Johnson
  • Patent number: 9934801
    Abstract: An apparatus comprises a slider having an air bearing surface and is configured for heat-assisted magnetic recording. The slider comprises a write pole, a near-field transducer (NFT) proximate the write pole, and an optical waveguide configured to receive light from a light source and couple the light to the NFT. The optical waveguide comprises first and second opposing major surfaces and opposing first and second edges connected to the first and second major surfaces. An optically opaque overlay is disposed on or adjacent one or both of the first and second major surfaces of the optical waveguide. Periodic structures are disposed on a surface of the optically opaque overlay facing the waveguide. The periodic structures are configured to organize stray light emanating from the waveguide for absorption by the optically opaque overlay.
    Type: Grant
    Filed: June 12, 2017
    Date of Patent: April 3, 2018
    Assignee: SEAGATE TECHNOLOGY LLC
    Inventors: James Gary Wessel, Chen Wang, Chubing Peng
  • Patent number: 9905253
    Abstract: An apparatus includes a near-field transducer (NFT) of a heat-assisted magnetic recording head. The NFT includes a substantially C-shaped portion and a peg portion extending from the substantially C-shaped portion. A planar member is disposed adjacent the NFT. The planar member includes a bottom surface configured to support surface plasmon polaritons (SPPs) that resonantly excite the NFT. A barrier member is installed within the planar member and is arranged to encompass at least a tip portion of the peg.
    Type: Grant
    Filed: February 13, 2017
    Date of Patent: February 27, 2018
    Assignee: SEAGATE TECHNOLOGY LLC
    Inventor: Tae-Woo Lee
  • Patent number: 9899043
    Abstract: A method of forming a near field transducer (NFT), the method including the steps of depositing a plasmonic material; depositing an encapsulant material on at least a portion of the plasmonic material; and implanting ions into at least a portion of the plasmonic material through the encapsulant material.
    Type: Grant
    Filed: February 13, 2017
    Date of Patent: February 20, 2018
    Assignee: Seagate Technology LLC
    Inventors: Sethuraman Jayashankar, Hui Brickner
  • Patent number: 9870793
    Abstract: A method of forming a near field transducer (NFT) layer, the method including depositing a film of a primary element, the film having a film thickness and a film expanse; and implanting at least one secondary element into the primary element, wherein the NFT layer includes the film of the primary element doped with the at least one secondary element.
    Type: Grant
    Filed: March 9, 2016
    Date of Patent: January 16, 2018
    Assignee: Seagate Technology LLC
    Inventors: Sethuraman Jayashankar, Michael C. Kautzky
  • Patent number: 9852752
    Abstract: A TAMR (thermal assisted magnetic recording) write head has a metal blocker formed against a distal end of a waveguide. The waveguide focuses optical radiation on an adjacent plasmon generator where it excites plasmon modes that heat the recording medium. Although the plasmon generator typically heats the recording medium using the plasmon near field to supply the required Joule heating, an unblocked waveguide would also send optical radiation to the medium and surrounding structures producing unwanted heating and device unreliability. The role of the blocker is to block the unwanted optical radiation and, thereby, to limit the heating to that supplied by the plasmon near field.
    Type: Grant
    Filed: August 12, 2016
    Date of Patent: December 26, 2017
    Assignee: Headway Technologies, Inc.
    Inventors: Tsutomu Chou, Kouji Shimazawa, Tobias Maletzky, Weihao Xu, Shinji Hara, Yoshihiro Tsuchiya, Yiming Wang, Cherng-Chyi Han, Xuhui Jin
  • Patent number: 9822444
    Abstract: Devices having an air bearing surface (ABS), the device including a near field transducer, the near field transducer having a peg and a disc, the peg having a region adjacent the ABS, the peg including a plasmonic material selected from gold (Au), silver (Ag), copper (Cu), ruthenium (Ru), rhodium (Rh), aluminum (Al), or combinations thereof; and at least one other secondary atom selected from germanium (Ge), tellurium (Te), aluminum (Al), antimony (Sb), tin (Sn), mercury (Hg), indium (In), zinc (Zn), iron (Fe), copper (Cu), manganese (Mn), silver (Ag), chromium (Cr), cobalt (Co), and combinations thereof, wherein a concentration of the secondary atom is higher at the region of the peg adjacent the ABS than a concentration of the secondary atom throughout the bulk of the peg, and a method of forming NFT thereof.
    Type: Grant
    Filed: November 11, 2015
    Date of Patent: November 21, 2017
    Assignee: Seagate Technology LLC
    Inventors: Tong Zhao, Michael C. Kautzky, Sarbeswar Sahoo, Justin Brons, Jie Gong, Yuhang Cheng
  • Patent number: 9810874
    Abstract: A lens driver which has a high driving effectiveness and a compact form, and which does not require a precise assembling and a assembling time.
    Type: Grant
    Filed: August 5, 2015
    Date of Patent: November 7, 2017
    Assignees: HUIZHOU DAYAWAN EVER BRIGHT ELECTRONIC INDUSTRY CO, JSS OPTICAL TECNOLOGY CO., LTD., HUIZHOU DAYA BAY JSS OPTICAL TECHNOLOGY.CO., LTD.
    Inventor: Kazuyoshi Hagiwara
  • Patent number: 9805757
    Abstract: A near field transducer includes gold and at least one dopant. The dopant can include at least one of: Cu, Rh, Ru, Ag, Ta, Cr, Al, Zr, V, Pd, Ir, Co, W, Ti, Mg, Fe, or Mo. The dopant concentration may be in a range from 0.5% and 30%. The dopant can be a nanoparticle oxide of V, Zr, Mg, Ca, Al, Ti, Si, Ce, Y, Ta, W, or Th, or a nitride of Ta, Al, Ti, Si, In, Fe, Zr, Cu, W or B.
    Type: Grant
    Filed: April 22, 2013
    Date of Patent: October 31, 2017
    Assignee: Seagate Technology LLC
    Inventors: Tong Zhao, Michael Christopher Kautzky, William Albert Challener, Michael Allen Seigler
  • Patent number: 9799353
    Abstract: A device that includes a near field transducer (NFT), the NFT having a disc and a peg, and the peg having an air bearing surface thereof; and at least one adhesion layer positioned on at least the air bearing surface of the peg, the adhesion layer including one or more of platinum (Pt), iridium (Ir), ruthenium (Ru), rhodium (Rh), palladium (Pd), yttrium (Y), chromium (Cr), nickel (Ni), and scandium (Sc).
    Type: Grant
    Filed: September 4, 2015
    Date of Patent: October 24, 2017
    Assignee: Seagate Technology LLC
    Inventors: Yuhang Cheng, Tong Zhao, Michael C. Kautzky, Ed F. Rejda, Kurt W. Wierman, Scott Franzen, Andrew J. Boyne, Michael Allen Seigler, Sethuraman Jayashankar
  • Patent number: 9799352
    Abstract: A near-field transducer includes an enlarged portion formed of a soft plasmonic metal. A diffusion barrier is formed on one side of the enlarged portion, the diffusion barrier made of a harder material than the soft plasmonic metal. A heat sink is formed on the diffusion barrier, the heat sink made of the soft plasmonic metal. A peg is embedded in the diffusion layer so that the peg is isolated from the enlarged portion and the heat sink. The peg made of the soft plasmonic material and extends out from the diffusion layer towards a recording medium.
    Type: Grant
    Filed: January 6, 2017
    Date of Patent: October 24, 2017
    Assignee: SEAGATE TECHNOLOGY LLC
    Inventors: Weibin Chen, Huaqing Yin, Martin Giles Blaber
  • Patent number: 9786303
    Abstract: An apparatus comprises a magnetic pole and a near-field transducer positioned at or near a media-facing surface and is separated from the magnetic pole, the near-field transducer configured to generate a thermal spot. The apparatus further comprises a layer proximate the magnetic pole and the near-field transducer, and the layer is configured to reduce a magnetic field proximate a center of the thermal spot.
    Type: Grant
    Filed: July 7, 2016
    Date of Patent: October 10, 2017
    Assignee: SEAGATE TECHNOLOGY LLC
    Inventors: Christopher J. Rea, Hua Zhou, Jie Gong
  • Patent number: 9786311
    Abstract: An apparatus includes a waveguide that delivers energy from an energy source, a write pole located proximate the waveguide at a media-facing surface, and a near-field transducer located proximate the write pole in a down track direction. The near-field transducer includes an enlarged portion and a peg extending from the enlarged portion towards the media-facing surface. The peg comprises a taper facing away from the write pole, and the taper causes a reduced down track dimension of the peg near the media-facing surface.
    Type: Grant
    Filed: July 28, 2016
    Date of Patent: October 10, 2017
    Assignee: SEAGATE TECHNOLOGY LLC
    Inventor: Weibin Chen
  • Patent number: 9741377
    Abstract: A thermally-assisted magnetic recording head includes a main pole and a plasmon generator. The plasmon generator includes a first material portion and a second material portion formed of different materials. The first material portion is located away from the medium facing surface. The second material portion includes a near-field light generating surface. The main pole has a front end face including a first end face portion and a second end face portion. The near-field light generating surface, the first end face portion and the second end face portion are arranged in this order along the direction of travel of a recording medium.
    Type: Grant
    Filed: February 23, 2016
    Date of Patent: August 22, 2017
    Assignee: HEADWAY TECHNOLOGIES, INC.
    Inventors: Yoshitaka Sasaki, Hiroyuki Ito, Shigeki Tanemura, Hideo Mamiya, Seiichiro Tomita, Hironori Araki