Near Field Optic Patents (Class 369/13.33)
  • Patent number: 11386922
    Abstract: A heat-assisted magnetic recording (HAMR) head has a protective multilayer confined to a window of the disk-facing surface of the slider that surrounds the near-field transducer (NFT) end and write pole end. The protective multilayer is made up of a first film of silicon nitride directly on and in contact with the NFT end and the write pole end and a second film of a metal oxide on and in contact with the silicon nitride film. The silicon nitride film is preferably formed by RIBD but is thin enough so that it does not contain any significant amount of other compounds. The metal oxide is preferably silicon dioxide, or alternatively an oxide of hafnium, tantalum, yttrium or zirconium, and together with the silicon nitride film provides a protective multilayer of sufficient thickness to be optically transparent to radiation and resistant to thermal oxidation.
    Type: Grant
    Filed: June 11, 2021
    Date of Patent: July 12, 2022
    Assignee: WESTERN DIGITAL TECHNOLOGIES, INC.
    Inventors: Nattaporn Khamnualthong, Krisda Siangchaew
  • Patent number: 11341992
    Abstract: An optical isolator has a first optical property with respect to transmitted components of the light traveling towards a target and a second optical property with respect to reflected components of the light traveling towards the laser. The second optical property suppresses the reflected components of the light. The optical isolator can be used in applications such as heat-assisted magnetic recording and LIDAR.
    Type: Grant
    Filed: February 8, 2021
    Date of Patent: May 24, 2022
    Assignee: Seagate Technology LLC
    Inventors: Aditya Jain, Zoran Jandric
  • Patent number: 11328744
    Abstract: An apparatus comprises a substrate. A laser is deposited above the substrate. The laser includes one or more non-self-supporting layers of crystalline material. A metallic adhesive is disposed between the laser and the substrate. The metallic adhesive is configured to adhere the laser to the substrate. A waveguide is deposited proximate the laser. The waveguide is configured to receive light from the laser and direct the light to a recording medium.
    Type: Grant
    Filed: January 29, 2021
    Date of Patent: May 10, 2022
    Assignee: Seagate Technology LLC
    Inventors: Fadi El Hallak, Michael Gerald Boyle, Paula Frances McElhinney, Marcus Benedict Mooney, Aidan Dominic Goggin, Cillian Macdara OBriain Fallon
  • Patent number: 11328747
    Abstract: A heat-assisted magnetic recording (HAMR) head has a gas-bearing slider that supports a near-field transducer (NFT) and a main magnetic pole. First heat-sink material is located on the cross-track sides of the main pole and second heat-sink material is located on the cross-track sides of the waveguide. The second heat-sink material may be in contact with the first heat-sink material, and a thermal shunt of high thermal conductivity may interconnect the NFT with the first and second heat-sink material. Heat from the NFT output tip flows to the second heat sink material through the NFT and the thermal shunt. Optically reflective material may be located between the waveguide and the second heat-sink material to improve the optical efficiency of the NFT.
    Type: Grant
    Filed: February 10, 2021
    Date of Patent: May 10, 2022
    Assignee: Western Digital Technologies, Inc.
    Inventor: Takuya Matsumoto
  • Patent number: 11315597
    Abstract: A plasmon generator (PG) is formed between a waveguide and main pole, and has a front portion (Au/Rh bilayer) wherein the upper Rh layer has a peg shape at an air bearing surface (ABS), and a tapered backside that is separated from a PG back portion by a dielectric spacer. The lower Au layer has a front side recessed from the ABS and curved sides self-aligned with the Rh layer sides. A key feature is that the back section of lower Au layer curved side forms a smaller angle with a plane aligned orthogonal to the ABS than a front section thereof thereby selectively enabling a deformation of the back end of the Au layer during a heat treatment to >300° C. at the wafer level. Accordingly, the front end of the lower Au layer is densified and provides an improved heat sink to improve reliability and area density capability (ADC).
    Type: Grant
    Filed: January 25, 2021
    Date of Patent: April 26, 2022
    Assignee: Headway Technologies, Inc.
    Inventors: Koji Shimazawa, Weihao Xu, Ken Fujii
  • Patent number: 11227633
    Abstract: A recording head includes a channel waveguide that delivers light to a media-facing surface. A near-field transducer (NFT) is at an end of the channel waveguide and proximate to the media-facing surface. A laser including an active region has a longitudinal axis corresponding to a propagation direction of the channel waveguide. The active region includes a back facet and a front facet proximate the NFT. The front facet has a surface shape configured to suppress back reflection of the light.
    Type: Grant
    Filed: October 28, 2020
    Date of Patent: January 18, 2022
    Assignee: Seagate Technology LLC
    Inventors: Aidan Dominic Goggin, John Moloney, Reyad Mehfuz, Chuan Zhong, Christopher Neil Harvey
  • Patent number: 11201452
    Abstract: A monolithically integrated optical device. The device has a gallium and nitrogen containing substrate member having a surface region configured on either a non-polar or semi-polar orientation. The device also has a first waveguide structure configured in a first direction overlying a first portion of the surface region. The device also has a second waveguide structure integrally configured with the first waveguide structure. The first direction is substantially perpendicular to the second direction.
    Type: Grant
    Filed: April 20, 2020
    Date of Patent: December 14, 2021
    Assignee: KYOCERA SLD Laser, Inc.
    Inventor: James W. Raring
  • Patent number: 11189312
    Abstract: A recording head includes a structure such as a near-field transducer formed of a noble metal. An adhesive layer is formed over a surface of the structure. The adhesive layer includes alumina and is 4 nm or less in thickness. A silicon dioxide layer is formed over the adhesive layer. The adhesive layer bonds the silicon dioxide to the structure.
    Type: Grant
    Filed: March 12, 2020
    Date of Patent: November 30, 2021
    Assignee: Seagate Technology LLC
    Inventor: Xiaoyue Huang
  • Patent number: 11189305
    Abstract: According to one embodiment, a magnetic disk device includes a disk, a head including a main magnetic pole having a first end and a second end opposite to the first end in a radial direction of the disk, a write shield facing the main magnetic pole with a gap, and an assist element provided in the gap and at a position where a first distance between the first end and the assist element and a second distance between the second end and the assist element are different from each other, and a controller which controls a voltage applied to the assist element according to a shingled write direction in which a second track is overwritten on a first track.
    Type: Grant
    Filed: February 16, 2021
    Date of Patent: November 30, 2021
    Assignees: KABUSHIKI KAISHA TOSHIBA, TOSHIBA ELECTRONIC DEVICES & STORAGE CORPORATION
    Inventor: Yusuke Tomoda
  • Patent number: 11164600
    Abstract: Methods of forming a near field transducer (NFT), the methods including the steps of depositing plasmonic material on a substrate; laser annealing at least a portion of the deposited plasmonic material at a wavelength from 100 nm to 2.0 micrometers (?m) to induce liquid phase epitaxy (LPE) in the annealed deposited plasmonic material to form a epitaxially modified plasmonic material; and forming a NFT from at least a portion of the epitaxially modified plasmonic material are disclosed as well as other methods and devices such as those formed.
    Type: Grant
    Filed: August 26, 2019
    Date of Patent: November 2, 2021
    Assignee: Seagate Technology LLC
    Inventors: Tong Zhao, Michael C. Kautzky, Lance Nevala
  • Patent number: 11120824
    Abstract: An apparatus comprises a slider configured for heat-assisted magnetic recording comprising an air bearing surface (ABS). The slider comprises a write pole at or near the ABS, and a near-field transducer (NFT) at or near the ABS and proximate the write pole. A main waveguide is configured to receive light from a laser source and communicate the light to the NFT. An optical power sensor comprises a tap waveguide optically coupled to the main waveguide and comprising a first end and an opposing second end. The optical power sensor also comprises a bolometer optically coupled to the tap waveguide and configured to receive a portion of the light extracted from the main waveguide by the tap waveguide.
    Type: Grant
    Filed: August 26, 2020
    Date of Patent: September 14, 2021
    Assignee: Seagate Technology LLC
    Inventors: Chubing Peng, Vivek Krishnamurthy, Nils Jan Gokemeijer
  • Patent number: 11114119
    Abstract: A thermally-assisted magnetic recording head includes a medium facing surface, a main pole, a waveguide, and a plasmon generator. The plasmon generator includes a first metal layer and a second metal layer. The first metal layer includes a plasmon exciting portion on which surface plasmons are excited. The second metal layer is located on the first metal layer, and includes a bottom surface in contact with the first metal layer, a top surface located on a side opposite to the bottom surface, a front end face that is located in the medium facing surface and generates near-field light from the surface plasmons, and a connecting surface that connects the top surface and the front end face. The connecting surface includes an inclined portion inclined relative to a direction perpendicular to the medium facing surface.
    Type: Grant
    Filed: October 2, 2020
    Date of Patent: September 7, 2021
    Assignee: HEADWAY TECHNOLOGIES, INC.
    Inventors: Yoshitaka Sasaki, Hiroyuki Ito, Shigeki Tanemura, Seiichiro Tomita
  • Patent number: 11043240
    Abstract: A near field transducer (NFT) with an upper RhIr layer having an Ir content from 20-80 atomic % and a lower Au layer is formed between a waveguide and main pole at an air bearing surface (ABS). The RhIr layer has a rod-like front portion (peg) up to height h1, and a substantially triangular shaped back portion (body) from h1 to height h2. In some embodiments, there is a Rh underlayer with a thickness from 10 Angstroms to 200 Angstroms between the upper and lower NFT layers, and extending from the ABS to h2 so that the RhIr layer has a substantially uniform microcrystalline structure throughout to prevent thermally induced rupture defects proximate to h1. Optionally, the Rh underlayer may have a front side at h1, and may further comprise a lower Al or Zr adhesion layer. Accordingly, there is improved device reliability.
    Type: Grant
    Filed: February 25, 2020
    Date of Patent: June 22, 2021
    Assignee: Headway Technologies, Inc.
    Inventors: Koji Shimazawa, Shengyuan Wang
  • Patent number: 11043238
    Abstract: A magnetic recording medium includes a substrate; a soft magnetic underlayer laminated on the substrate; an amorphous barrier layer laminated on the soft magnetic underlayer; and a magnetic recording layer laminated on the amorphous barrier layer, wherein the soft magnetic underlayer includes Fe, B, Si, and one or more elements selected from the group consisting of Nb, Zr, Mo, and Ta, wherein the amorphous barrier layer includes Si, W, and one or more elements selected from the group consisting of Nb, Zr, Mo, and Ta, and wherein the magnetic recording layer includes an alloy having an L10 structure.
    Type: Grant
    Filed: December 9, 2020
    Date of Patent: June 22, 2021
    Assignee: SHOWA DENKO K.K.
    Inventors: Takehiro Yamaguchi, Takayuki Fukushima, Lei Zhang, Hisato Shibata, Chen Xu, Hiroshi Koyanagi, Yuji Umemoto
  • Patent number: 11011192
    Abstract: An optically shielded (thermally assisted magnetic recording (TAMR) head comprises a perpendicular magnetic recording (PMR) write head and a near-field transducer (NFT) having an emerging peg at the air-bearing surface (ABS). Self-aligned optical side shields (SA-OSS) are formed using a self-aligning process that positions the shields symmetrically relative to the emergent peg of the NFT. As a result of the symmetric positioning the down-track and cross-track near-field and near-field gradients are significantly sharpened.
    Type: Grant
    Filed: February 25, 2020
    Date of Patent: May 18, 2021
    Assignee: Headway Technologies, Inc.
    Inventors: Weihao Xu, Ittetsu Kitajima, Cherng-Chyi Han, Xuhui Jin, Weisheng Hu, Ethan Lo
  • Patent number: 11005065
    Abstract: A laminate includes: a substrate having a first surface and made of a high-molecular-weight material; an undercoat layer located on at least part of the first surface of the substrate and containing a first inorganic substance that has adsorption sites to be coupled to precursors serving as film-forming materials of an atomic layer deposition film; a functional layer located covering an outer surface of the undercoat layer and containing a second inorganic substance to be coupled to the adsorption sites of the undercoat layer, the functional layer being the atomic layer deposition film formed of the precursors; and an overcoat layer located covering an outer surface of the functional layer and containing a third inorganic substance.
    Type: Grant
    Filed: June 27, 2018
    Date of Patent: May 11, 2021
    Assignee: TOPPAN PRINTING CO., LTD.
    Inventors: Jin Sato, Mitsuru Kano, Hiroshi Koyama, Kyoko Kuroki
  • Patent number: 10978102
    Abstract: A thermally assisted magnetic head including a main magnetic pole layer having a magnetic pole end face arranged in a medium-opposing surface, a near-field transducer which generates a near-field light for heating the magnetic recording medium, a waveguide guiding light to the near-field transducer; and an optical side shield being arranged in the medium-opposing surface side of the waveguide and being formed so as to sandwich a part of the near-field transducer, in the medium-opposing surface side, from both sides of a direction along the medium-opposing surface. The near-field transducer includes a protruding end-part (PEG). Then the protruding end-part is arranged to have a PEG end-surface at a position receded from the medium-opposing surface.
    Type: Grant
    Filed: May 28, 2020
    Date of Patent: April 13, 2021
    Assignee: SAE Magnetics (H.K.) Ltd.
    Inventors: Wai Yuen Anthony Lai, Hon Kit Lau
  • Patent number: 10971177
    Abstract: A first heat-assisted magnetic recording (HAMR) writer writes to a surface of a magnetic disk using during an initial time period. A second HAMR writer is configured to write to the surface but not during the initial time period. The initial time period extends from a first time when the disk drive is first used to a second time when a near-field transducer of the first HAMR writer reaches a first wear threshold. During a subsequent time period after the initial time period, to the surface of the disk is written to using the second HAMR writer and not the first HAMR writer.
    Type: Grant
    Filed: May 29, 2020
    Date of Patent: April 6, 2021
    Assignee: Seagate Technology LLC
    Inventors: James E. Angelo, Mehmet Fatih Erden, John W. Dykes
  • Patent number: 10957345
    Abstract: According to one embodiment, a magnetic disk device includes a disk, a head including a main magnetic pole having a first end and a second end opposite to the first end in a radial direction of the disk, a write shield facing the main magnetic pole with a gap, and an assist element provided in the gap and at a position where a first distance between the first end and the assist element and a second distance between the second end and the assist element are different from each other, and a controller which controls a voltage applied to the assist element according to a shingled write direction in which a second track is overwritten on a first track.
    Type: Grant
    Filed: September 4, 2019
    Date of Patent: March 23, 2021
    Assignees: Kabushiki Kaisha Toshiba, Toshiba Electronic Devices & Storage Corporation
    Inventor: Yusuke Tomoda
  • Patent number: 10910007
    Abstract: A heat-assisted magnetic recording (HAMR) hard disk drive has a gas-bearing slider supporting a near-field transducer (NFT) and a NFT temperature sensor (NTS). An optional first IVC circuitry may provide a bias voltage to the slider body to assure substantially zero electrical potential between the slider body and the disk to minimize slider-disk contact and lubrication pick-up. A second IVC circuitry operates independently of the first IVC circuitry and provides a negative bias voltage to the NTS (and the connected NFT) relative to the disk to minimize the adverse effects of excessive heating on the NFT.
    Type: Grant
    Filed: February 14, 2020
    Date of Patent: February 2, 2021
    Assignee: WESTERN DIGITAL TECHNOLOGIES, INC.
    Inventors: Tan Trinh, Sukumar Rajauria, Yuichi Aoki, Kosuke Nagase, Erhard Schreck, Qing Dai
  • Patent number: 10839830
    Abstract: A recording head comprises a waveguide core extending to an air-bearing surface, and a near-field transducer is centrally aligned with the waveguide core and positioned proximate a first side of the waveguide core in a down-track direction. First and second mirror portions form a mirror surrounding the near-field transducer in a cross-track direction with a gap therebetween. The mirror extends in the direction normal to the air-bearing surface a first distance that is less than a second distance the near-field transducer extends in the direction normal the air-bearing surface. First and second reflective heatsink structures are respectively coupled to the first and second mirror portions. The heatsink structures are spaced apart from the near-field transducer in the cross-track direction and extend in a direction normal the air-bearing surface, such that proximate the air-bearing surface the first and second reflective heatsink structures extend substantially parallel to, or converge toward, each other.
    Type: Grant
    Filed: December 16, 2019
    Date of Patent: November 17, 2020
    Assignee: Seagate Technology LLC
    Inventors: Chubing Peng, Martin Giles Blaber, Tae-Woo Lee
  • Patent number: 10839843
    Abstract: A method of operating an HDD having a slider-mounted read/write head that is configured for dynamic fly-height operation (DFH) and includes at least one head-disk interference sensor (HDIs). By operating the DFH to lower the head and subjecting the HDIs signal to a power-law enhancement, a consistent and accurate determination of the touchdown power (TDP) can be obtained. Combining absolute TDP determination with a method for measuring relative changes of FH, an absolute determination of FH can be determined.
    Type: Grant
    Filed: August 30, 2019
    Date of Patent: November 17, 2020
    Assignees: SAE Magnetics (H.K.) Ltd., Headway Technologies, Inc.
    Inventors: Qinghua Zeng, Soramany Ka, Ellis Cha
  • Patent number: 10832717
    Abstract: A near-field transducer has an enlarged portion with a layer of soft plasmonic material. A peg formed of a thermally robust plasmonic material includes an embedded part that is partially embedded within the enlarged portion and has an exposed surface facing away from the enlarged portion. An intersection between a lower edge of the enlarged portion and the embedded part has a discontinuity.
    Type: Grant
    Filed: July 30, 2019
    Date of Patent: November 10, 2020
    Assignee: Seagate Technology LLC
    Inventors: Yuhang Cheng, Nan Zhou, Yongjun Zhao, Huaqing Yin, Weibin Chen, Michael Allen Seigler
  • Patent number: 10811043
    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: December 16, 2019
    Date of Patent: October 20, 2020
    Assignee: Seagate Technology LLC
    Inventors: Christopher Neil Harvey, Aidan Dominic Goggin, Kelly Elizabeth Callan, Reyad Mehfuz
  • Patent number: 10734019
    Abstract: An apparatus includes an input coupler configured to receive light excited by a light source. A near-field transducer (NFT) is positioned at a media-facing surface of a write head. A layered waveguide is positioned between the input coupler and the NFT and configured to receive the light output from the input coupler in a transverse electric (TE) mode and deliver the light to the NFT in a transverse magnetic (TM) mode. The layered waveguide comprises a first layer extending along a light-propagation direction. The first layer is configured to receive light from the input coupler. The first layer tapers from a first cross track width to a second cross track width where the second cross track width is narrower than the first cross track width. The layered waveguide includes a second layer that is disposed on the first layer. The second layer has a cross sectional area in a plane perpendicular to the light propagation direction that increases along the light propagation direction.
    Type: Grant
    Filed: July 31, 2019
    Date of Patent: August 4, 2020
    Assignee: Seagate Technology LLC
    Inventors: Christopher Neil Harvey, Aidan Dominic Goggin, Kelly Elizabeth Callan, John Bernard McGurk, Reyad Mehfuz
  • Patent number: 10699740
    Abstract: A device including a near field transducer, the near field transducer including gold (Au), silver (Ag), copper (Cu), or aluminum (Al), and at least two other secondary atoms, the at least two other secondary atoms selected from: boron (B), bismuth (Bi), indium (In), sulfur (S), silicon (Si), tin (Sn), manganese (Mn), tellurium (Te), holmium (Ho), lutetium (Lu), praseodymium (Pr), scandium (Sc), uranium (U), barium (Ba), chlorine (Cl), cesium (Cs), dysprosium (Dy), europium (Eu), fluorine (F), germanium (Ge), hydrogen (H), iodine (I), rubidium (Rb), selenium (Se), terbium (Tb), nitrogen (N), oxygen (O), carbon (C), antimony (Sb), gadolinium (Gd), samarium (Sm), thallium (Tl), cadmium (Cd), neodymium (Nd), phosphorus (P), lead (Pb), hafnium (Hf), niobium (Nb), erbium (Er), zinc (Zn), magnesium (Mg), palladium (Pd), vanadium (V), zinc (Zn), chromium (Cr), iron (Fe), lithium (Li), nickel (Ni), platinum (Pt), sodium (Na), strontium (Sr), calcium (Ca), yttrium (Y), thorium (Th), beryllium (Be), thulium (Tm), erbium
    Type: Grant
    Filed: November 21, 2016
    Date of Patent: June 30, 2020
    Assignee: Seagate Technology LLC
    Inventors: Yuhang Cheng, Tong Zhao, Michael C. Kautzky, Ed F. Rejda, Kurt W. Wierman, Scott Franzen, Sethuraman Jayashankar, Sarbeswar Sahoo, Justin Glen Brons, Steve C. Riemer, Jie Gong, Michael Allen Seigler
  • Patent number: 10679653
    Abstract: A method of operating a HDD having a read/write head configured for Perpendicular Magnetic Recording (PMR) and configured for use in Thermally Assisted Magnetic Recording (TAMR). By using selected settings of a power ratio (PR) value to ensure that accurate fly height (FH) measurements of head-disk interference (HDI) can be taken during write touchdowns (TDs), head damage can be eliminated during HDI events. Under normal operating conditions the PMR head develops a sharp protrusion due to heating from the TAMR apparatus as well as the write current and read and write heaters. The sharp protrusion is prone to striking the disk surface, instead of the shields doing so. The shields would be more capable of absorbing the HDI, which would allow the HDI sensors (HDIs) to provide a more sensitive reading of the HDI which would prevent head wear caused by the sharp protrusion.
    Type: Grant
    Filed: March 8, 2019
    Date of Patent: June 9, 2020
    Assignees: SAE Magnetics (H.K.) Ltd., Headway Technologies, Inc.
    Inventors: Qinghua Zeng, Siu Yin Ngan, Soramany Ka, Ellis Cha
  • Patent number: 10657994
    Abstract: A folded lasing cavity comprises at least one bend. The folded lasing cavity is disposed on and configured to emit light along a substrate-parallel plane. An etched facet is on an emitting end of the folded lasing cavity and an etched mirror is on another end of the folding lasing cavity. An etched shaping mirror redirects light received from the etched facet in a direction normal to the substrate-parallel plane.
    Type: Grant
    Filed: December 14, 2018
    Date of Patent: May 19, 2020
    Assignee: Seagate Technology LLC
    Inventors: Roger L. Hipwell, Jr., Scott Eugene Olson
  • Patent number: 10657991
    Abstract: An apparatus comprises a slider having an air bearing surface (ABS), a leading edge, and a trailing edge opposing the leading edge. A writer having a write pole is situated at or near the ABS. A near-field transducer (NFT) is situated at or near the ABS and between the write pole and the leading edge of the slider. An optical waveguide is configured to couple light from a laser source to the NFT. A contact sensor is situated between the write pole and the trailing edge. The contact sensor comprises a first ABS section situated at or near the ABS, a second ABS section situated at or near the ABS and spaced apart from the first ABS in a cross-track direction by a gap, and a distal section extending away from the ABS and connecting the first ABS section with the second ABS section.
    Type: Grant
    Filed: July 29, 2019
    Date of Patent: May 19, 2020
    Assignee: Seagate Technology LLC
    Inventors: Erik Jon Hutchinson, Declan Macken, Manuel Charles Anaya-Dufresne
  • Patent number: 10643641
    Abstract: A slider for heat assisted magnetic recording (HAMR) is provided. The slider includes a writer for writing data to a HAMR medium, a reader for reading data stored on the HAMR medium, a near field transducer (NFT), a first waveguide optically coupled to the NFT, a slider laser configured to generate and transmit a first light energy to the first waveguide such that the NFT causes a portion of the HAMR medium to heat up, to assist the writer for writing data to the HAMR medium, and a second waveguide optically coupled to the NFT, for transmitting a light energy from an external laser to the NFT to optically anneal the NFT during a fabrication process of the slider.
    Type: Grant
    Filed: March 29, 2019
    Date of Patent: May 5, 2020
    Assignee: WESTERN DIGITAL TECHNOLOGIES, INC.
    Inventors: Bin Ouyang, Takuya Matsumoto, Utis Cumhnoo, Mousumi Mani Biswas, Ozgun Suzer, Marc A Finot
  • 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: 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: 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: 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: 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: 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: 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: 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: 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: 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