Single Magnetic Layer Having Two Or More Nonmagnetic Underlayers (e.g., Seed Layers, Barrier Layers, Etc.) Patents (Class 428/831)
  • Patent number: 12040114
    Abstract: The present disclosure generally relates to magnetoresistive (MR) devices. The MR device comprises a synthetic antiferromagnetic (SAF) layer that increases stability to magnetic fields, and in turn, results in lower magnetic noise of the device. The MR device comprises a first ferromagnetic (FM1) layer and a second ferromagnetic (FM2) layer, in between which is an SAF spacer of RuAl alloy having a B2 crystalline structure with (001) texture, meaning that the (001) plane is parallel to the surface of MR device substrate. The first ferromagnetic (FM1) layer and a part of the second ferromagnetic (FM2) layer also have the (001) texture. An amorphous layer in a second ferromagnetic (FM2) layer can reset the growth texture of the MR device to a (111) texture in order to promote the growth of an antiferromagnetic (AF) pinning layer.
    Type: Grant
    Filed: September 14, 2022
    Date of Patent: July 16, 2024
    Assignee: Western Digital Technologies, Inc.
    Inventors: Susumu Okamura, James Mac Freitag, Yuankai Zheng, Brian R. York
  • Patent number: 11763845
    Abstract: A magnetic stack includes a substrate and a soft magnetic underlayer deposited on a top surface of the substrate. A heat sink layer is disposed on top of the soft magnetic underlayer, and an interlayer is deposited on top of the heat sink layer. A non-magnetic seed layer is deposited on top of the interlayer. A magnetic recording structure which includes more than one magnetic recording layer is deposited on the top surface of the non-magnetic seed layer.
    Type: Grant
    Filed: December 17, 2021
    Date of Patent: September 19, 2023
    Assignee: SEAGATE TECHNOLOGY LLC
    Inventors: Florin Zavaliche, Kai Chieh Chang, Pin-Wei Huang, Ganping Ju, Jan-Ulrich Thiele
  • Patent number: 11088240
    Abstract: A capacitor includes a lower electrode including a first metal material and having a first crystal size in a range of a few nanometers, a dielectric layer covering the lower electrode and having a second crystal size that is a value of a crystal expansion ratio times the first crystal size and an upper electrode including a second metal material and covering the dielectric layer. The upper electrode has a third crystal size smaller than the second crystal size.
    Type: Grant
    Filed: June 18, 2019
    Date of Patent: August 10, 2021
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Eun-Sun Kim, Sang-Yeol Kang, Kyoo-Ho Jung, Kyu-Ho Cho, Hyo-Sik Mun
  • Patent number: 10796996
    Abstract: A semiconductor device includes a substrate, a dielectric layer disposed on the substrate, and a conductive stack disposed within the dielectric layer. The conductive stack includes at least one first conductive layer, a second conductive layer disposed over the at least one first conductive layer, and a contact structure disposed between the at least one first conductive layer and the second conductive layer. The contact structure includes a contact via electrically connecting the at least one first conductive layer to the second conductive layer, and a glue layer conformal to sidewalls and a bottom surface of the contact via. The glue layer has isolated lattices and an amorphous region at which the isolated lattices are uniformly distributed.
    Type: Grant
    Filed: August 29, 2017
    Date of Patent: October 6, 2020
    Assignee: TAIWAN SEMICONDUCTOR MANUFACTURING CO., LTD.
    Inventors: Chi-Ming Lu, Jung-Chih Tsao, Yao-Hsiang Liang, Chih-Chang Huang, Han-Chieh Huang
  • Patent number: 10781133
    Abstract: A scratch-resistant amorphous and transparent AlSiN cover layer on a glass or glass ceramic substrate is provided. The cover layer has a low surface roughness and has sliding properties with respect to pots and other items. The cover layer is transparent in the visible light range and also largely transparent in the infrared range and has good chemical resistance to salted water burn-in.
    Type: Grant
    Filed: September 4, 2015
    Date of Patent: September 22, 2020
    Assignee: SCHOTT AG
    Inventors: Thorsten Damm, Christian Henn
  • Patent number: 10553242
    Abstract: A heat-assisted magnetic recording medium includes: a substrate; an underlayer; and a magnetic layer that is (001)-oriented. In the magnetic layer, a first magnetic layer and a second magnetic layer are stacked in this order from the underlayer side. The first magnetic layer and the second magnetic layer include an alloy having an L10 structure. The second magnetic layer includes a ferrite at grain boundaries of magnetic grains. The ferrite is one or more kinds selected from the group consisting of NiFe2O4, MgFe2O4, MnFe2O4, CuFe2O4, ZnFe2O3, CoFe2O4, BaFe2O4, SrFe2O4, and Fe3O4. A Curie temperature of the magnetic grains is lower than a Curie temperature of the ferrite.
    Type: Grant
    Filed: June 19, 2019
    Date of Patent: February 4, 2020
    Assignee: SHOWA DENKO K.K.
    Inventors: Lei Zhang, Takayuki Fukushima, Chen Xu, Kazuya Niwa, Hisato Shibata, Takehiro Yamaguchi, Tetsuya Kanbe, Tomoo Shige
  • Patent number: 10347467
    Abstract: In some examples, a method including depositing a functional layer over a substrate; depositing a granular layer over the functional layer, the granular layer including a first material defining a plurality of grains separated by a second material defining grain boundaries of the plurality of grains; removing the second material from the granular layer such that the plurality of grains of the granular layer define a hard mask layer on the functional layer; and removing, via reactive ion etching with a carrier gas, portions of the functional layer not masked by the hard mask layer, wherein the carrier gas comprises a gas with an atomic number less than an atomic number of argon.
    Type: Grant
    Filed: August 22, 2016
    Date of Patent: July 9, 2019
    Assignee: Regents of the University of Minnesota
    Inventors: Jian-Ping Wang, Patrick Quarterman, Jianxin Zhu
  • Patent number: 10134978
    Abstract: A magnetic cell structure comprises a seed material including tantalum, platinum, and ruthenium. The seed material comprises a platinum portion overlying a tantalum portion, and a ruthenium portion overlying the platinum portion. The magnetic cell structure comprises a magnetic region overlying the seed material, an insulating material overlying the magnetic region, and another magnetic region overlying the insulating material. Semiconductor devices including the magnetic cell structure, methods of forming the magnetic cell structure and the semiconductor devices are also disclosed.
    Type: Grant
    Filed: August 2, 2017
    Date of Patent: November 20, 2018
    Assignee: Micron Technology, Inc.
    Inventors: Wei Chen, Jonathan D. Harms, Sunil Murthy
  • Patent number: 9911445
    Abstract: A perpendicular magnetic recording medium includes a non-magnetic substrate; an underlayer including first and second underlayers; and a magnetic recording layer including a layer having a granular structure including grains of a magnetic crystal and grain boundary portions, wherein the first underlayer has a NaCl structure with a (001) orientation and contains a nitride or an oxide of at least one element. The first underlayer may contain a nitride of at least one of Cr, V, Ti, Sc, Mo, Nb, Zr, Y, Al, and B, and the second underlayer may include a plurality of island-shaped regions and contain at least one of Mg, Ca, Co, and Ni. The first underlayer may contains an oxide of at least one of Mg, Ca, Co, and Ni, and the second underlayer may include net-shaped regions and contain at least one of Cr, V, Ti, Sc, Mo, Nb, Zr, Y, Al, B, and C.
    Type: Grant
    Filed: April 3, 2015
    Date of Patent: March 6, 2018
    Assignee: FUJI ELECTRIC CO., LTD.
    Inventor: Shinji Uchida
  • Patent number: 9685184
    Abstract: A recording medium having improved signal-to-noise ratio (SNR) capabilities includes a NiFeX-based magnetic seed layer over a soft magnetic underlayer, where X comprises an element that is soluble in and has a higher melting point than Ni. X may be selected from a group of elements, including ruthenium (Ru), which may facilitate growth of smaller grains and distributions in the corresponding magnetic recording layer(s).
    Type: Grant
    Filed: September 25, 2014
    Date of Patent: June 20, 2017
    Assignee: WD Media, LLC
    Inventors: Kumar Srinivasan, Tuqiang Li, Mrugesh Desai
  • Patent number: 9595285
    Abstract: According to one embodiment, a magnetic recording medium includes an orientation control layer formed on a non-magnetic substrate, the orientation control layer made of a Ni alloy or Ag alloy having fcc structure, a non-magnetic seed layer made of Ag, Ge, and a metal X selected from the group consisting of Al, Mg, Au, and Ti, a non-magnetic intermediate layer made of Ru or Ru alloy, and a magnetic recording layer. The orientation control layer is in contact with the non-magnetic seed layer.
    Type: Grant
    Filed: October 14, 2014
    Date of Patent: March 14, 2017
    Assignee: KABUSHIKI KAISHA TOSHIBA
    Inventors: Takeshi Iwasaki, Akira Fujimoto
  • Patent number: 9484200
    Abstract: A thin film transistor includes a gate electrode, a source electrode, a drain electrode disposed on the same layer as the source electrode and facing the source electrode, an oxide semiconductor layer disposed between the gate electrode and the source electrode or the drain electrode, and a gate insulating layer disposed between the gate electrode and the source electrode or the drain electrode, in which the oxide semiconductor layer includes thallium and at least one of indium, zinc, tin, and gallium. Also an oxide sputtering target including: an oxide including thallium (Tl); and at least one of indium, zinc, tin, and gallium.
    Type: Grant
    Filed: October 9, 2013
    Date of Patent: November 1, 2016
    Assignee: SAMSUNG DISPLAY CO., LTD.
    Inventors: Katsushi Kishimoto, Takayuki Fukasawa
  • Patent number: 9478248
    Abstract: A data storage device and associated methods may provide at least a data storage medium that is separated from a heat assisted magnetic recording data writer and is connected to a controller. The controller can be configured to change a laser power of the heat assisted magnetic recording data writer in response to a tested bit error rate of a median data track of a plurality of adjacent data tracks reaching an identified threshold.
    Type: Grant
    Filed: October 13, 2014
    Date of Patent: October 25, 2016
    Assignee: Seagate Technology LLC
    Inventors: Michael A. Cordle, Franklin P. Martens, Alfredo Sam Chu, Shawn Stephen Silewski, Tim Rausch
  • Patent number: 9324353
    Abstract: In one embodiment, a magnetic media suitable for HAMR recording includes a recording layer having first and second magnetic layers. The first magnetic layer has a first segregant between magnetic grains thereof, the first segregant being primarily C. Moreover, the second magnetic layer is formed above the first magnetic layer. The second magnetic layer has a second segregant between magnetic grains thereof, the second segregant being primarily C and a second component. Additional systems and methods are also described herein.
    Type: Grant
    Filed: November 19, 2013
    Date of Patent: April 26, 2016
    Assignee: HGST Netherlands B.V.
    Inventors: Olav Hellwig, Oleksandr Mosendz, Simone Pisana, Dieter K. Weller
  • Patent number: 9318140
    Abstract: A magnetic media having a novel cap layer that allows the cap layer having improved exchange coupling and reduced thickness. The cap layer is doped with a non-reactive element such as Ar, Kr, Xe, Ne or He preferably Ar. This doping reduces increases exchange coupling and reduces the dead layer, allowing the cap layer to be made thinner for reduced magnetic spacing and improved data recording performance.
    Type: Grant
    Filed: December 19, 2012
    Date of Patent: April 19, 2016
    Assignee: HGST Netherlands B.V.
    Inventors: Gunn Choe, Yoshihiro Ikeda
  • Patent number: 9249497
    Abstract: Provided is a Ni alloy sputtering target containing Pt in an amount of 5 to 30 at %, and one or more components selected from V, Al, Cr, Ti, Mo, and Si in a total amount of 1 to 5 at %, wherein the remainder is Ni and unavoidable impurities. The present invention is able to increase the low pass-through flux (PTF), which is a drawback of a Ni—Pt alloy having high magnetic permeability, increase the erosion area of the target which tends to be small as a result of the magnetic field lines being locally concentrated on the surface of the target during sputtering, and inhibit the difference between the portion where erosion is selectively advanced and the portion where erosion does not advance as much as the erosion progresses.
    Type: Grant
    Filed: March 18, 2011
    Date of Patent: February 2, 2016
    Assignee: JX Nippon Mining & Metals Corporation
    Inventors: Yasuhiro Yamakoshi, Kazumasa Ohashi
  • Patent number: 9159351
    Abstract: A perpendicular magnetic recording medium includes a substrate, a soft magnetic layer, a pre-underlayer, an underlayer, and a main recording layer serving as a magnetic recording layer. The pre-underlayer contains seed crystal grains that serve as a base for crystal grains of the underlayer, and an addition substance that is added between the seed crystal grains and composed of an element having an atomic radius smaller than that of an element forming the seed crystal grains.
    Type: Grant
    Filed: October 14, 2008
    Date of Patent: October 13, 2015
    Assignee: WD Media (Singapore) PTE. LTD
    Inventors: Kazuaki Sakamoto, Kong Kim, Takahiro Onoue, Masafumi Ishiyama, Teiichiro Umezawa, Kenji Ayama
  • Patent number: 9093211
    Abstract: A storage element includes a storage layer having a magnetization perpendicular to a layer surface and storing information according to a magnetization state of a magnetic material; a fixed magnetization layer having the magnetization as a reference of the information of the storage layer and perpendicular to the layer surface; an interlayer formed of a nonmagnetic material and interposed between the storage layer and the fixed magnetization layer; a coercive force enhancement layer adjacent to the storage layer, opposite to the interlayer, and formed of Cr, Ru, W, Si, or Mn; and a spin barrier layer formed of an oxide, adjacent to the coercive force enhancement layer, and opposite to the storage layer. The storage layer magnetization is reversed using spin torque magnetization reversal caused by a current in a lamination direction of a layer structure including the storage layer, the interlayer, and the fixed magnetization layer, thereby storing information.
    Type: Grant
    Filed: April 19, 2012
    Date of Patent: July 28, 2015
    Assignee: SONY CORPORATION
    Inventors: Hiroyuki Ohmori, Masanori Hosomi, Kazuhiro Bessho, Yutaka Higo, Kazutaka Yamane, Hiroyuki Uchida, Tetsuya Asayama
  • Patent number: 9076476
    Abstract: Iron-platinum (FePt) based magnetic recording media structures that provide small grain size and isolated-grain configurations suitable for high-density magnetic recording. In one of the structures, the recording media structure includes a thin film containing grains of L10 FePt and boron as a segregant contained in intergranular regions located among the FePt grains. In another structure, the recording media structure includes a thin film containing grains of L10 FePt, wherein the film is formed on an underlayer containing at least one material selected to control the size of the FePt grains in the film. Proper choices of materials, relative amounts of the materials, processing parameters, and other variables permit these structures to be formed with grain sizes, magnetization orientations, and perpendicular coercivities that allow designers to create magnetic storage devices having storage densities of 1 Tbit/in2 and greater.
    Type: Grant
    Filed: September 21, 2012
    Date of Patent: July 7, 2015
    Assignee: Carnegie Mellon University
    Inventors: Mark Kryder, Steven D. Granz, Katayun Barmak Vaziri
  • Publication number: 20150138938
    Abstract: According to one embodiment, a magnetic recording medium used in a heat assisted magnetic recording system includes a magnetic recording layer and a metal particle layer in which metal particles are arranged in a dispersed manner on a substrate. In the metal particle layer, percentage content of the metal particles in a second region positioned at an outer periphery side of a first region is higher than that of the first region in a surface direction of the substrate.
    Type: Application
    Filed: March 5, 2014
    Publication date: May 21, 2015
    Applicant: KABUSHIKI KAISHA TOSHIBA
    Inventors: Hironori Teguri, Kazutaka Takizawa
  • Publication number: 20150132609
    Abstract: Provided are an element structure in which a magnetic layer has a high magnetic anisotropy constant and saturated magnetization properties in a thickness of 1.5 nm or less, and a magnetic device that uses the element structure. A BCC metal nitride/CoFeB/MgO film structure that uses a nitride of a BCC metal as a seed layer is fabricated. The nitride amount in the BCC metal nitride is preferably less than 60% in terms of volume ratio based on 100% BCC metal. It is thereby possible to readily obtain a perpendicularly magnetized film having the magnetic properties that the perpendicular magnetic anisotropy is 0.1×106 erg/cm3 or more and the saturated magnetization is 200 emu/cm3 or more, even when the thickness of the magnetic layer is 0.3 nm or more and 1.5 nm or less.
    Type: Application
    Filed: March 22, 2013
    Publication date: May 14, 2015
    Applicant: NATIONAL INSTITUTE FOR MATERIALS SCIENCE
    Inventors: Masamitsu Hayashi, Sinha Jaivardhan, Masaya Kodzuka, Tomoya Nakatani, Yukiko Takahashi, Takao Furubayashi, Seiji Mitani, Kazuhiro Hono
  • Patent number: 8993134
    Abstract: A perpendicular magnetic recording medium, comprising: a substrate; a buffer layer deposited in a first orientation on top of the substrate; an underlayer deposited in a second orientation on top of the buffer layer, the underlayer comprising an electrically conductive oxide; and a magnetic recording layer deposited on top of the underlayer and having an axis of magnetic anisotropy substantially perpendicular to the surface thereof.
    Type: Grant
    Filed: June 29, 2012
    Date of Patent: March 31, 2015
    Assignee: Western Digital Technologies, Inc.
    Inventors: Bollapragada Varaprasad, Yukiko Takahashi, Kazuhiro Hono, Antony Ajan, Hua Yuan, Alexander S. Chernyshov
  • Publication number: 20150085628
    Abstract: A thermally-assisted magnetic recording medium or a microwave-assisted magnetic recording medium includes: an orientation control layer (104) that is formed on a substrate (101); an underlayer (10) that is formed on the orientation control layer (104); and a magnetic layer (108) that is formed on the underlayer (10) and contains an alloy having an L10 type crystal structure as a main component, in which the underlayer (10) includes an MgO underlayer (107) that contains MgO and has a (100) orientation and a nitride underlayer (106) that contains at least one nitride selected from the group consisting of TaN, NbN, and HfN and has a (100) orientation.
    Type: Application
    Filed: May 10, 2013
    Publication date: March 26, 2015
    Applicant: SHOWA DENKO K.K.
    Inventors: Kazuya Niwa, Tetsuya Kanbe, Yuji Murakami, Lei Zhang
  • Publication number: 20150049594
    Abstract: A thermally assisted magnetic recording medium (1) includes a substrate (101), an underlayer (3) that is formed above the substrate (101), and a magnetic layer (107) that is formed on the underlayer (3) and contains an alloy having an L10 structure as a main component. The underlayer (3) is formed by continuously laminating a first underlayer (104) having a BCC structure with a lattice constant that is 0.302 to 0.332 nm, a second underlayer (105) that has a NaCl structure including C, and a third underlayer (106) that is composed of MgO.
    Type: Application
    Filed: April 30, 2013
    Publication date: February 19, 2015
    Applicant: SHOWA DENKO K.K.
    Inventors: Tetsuya Kanbe, Kazuya Niwa, Yuji Murakami, Lei Zhang
  • Patent number: 8956741
    Abstract: Media may be produced with narrow c-axis dispersion while having small grain size and high grain density. A dual seed layer design and a substrate bias voltage may be applied during deposition of the seed layer are used in the media. In some embodiments, the first seed layer is an amorphous material because of a high content of elements with large atomic sizes. Application of the substrate bias during deposition of the second seed layer may reduce the grain size and may narrow c-axis dispersion.
    Type: Grant
    Filed: June 30, 2011
    Date of Patent: February 17, 2015
    Assignee: WD Media, LLC
    Inventors: Tuqiang Li, Donald C. Stafford, Sudhir S. Malhotra, Tsutomu T. Yamashita
  • Publication number: 20150036242
    Abstract: A magnetic recording medium includes a substrate, a magnetic layer including an alloy having a L10 type crystal structure as a main component thereof, and a plurality of underlayers arranged between the substrate and the magnetic layer. The plurality of underlayers include a first underlayer including two or more elements selected from a group consisting of Ta, Nb, Ti, and V, and one or more elements selected from a group consisting of W and Mo, and a second underlayer including MgO.
    Type: Application
    Filed: July 17, 2014
    Publication date: February 5, 2015
    Inventors: Lei ZHANG, Tetsuya KANBE, Yuji MURAKAMI, Kazuya NIWA
  • Publication number: 20150029830
    Abstract: A magnetic recording medium includes a substrate, a magnetic layer including an alloy having an L10 type crystal structure as a main component thereof, a plurality of underlayers arranged between the substrate and the magnetic layer, and a barrier layer made of a material having an NaCl structure. The plurality of underlayers include at least one crystalline underlayer including Mo as a main component thereof, and at least one of Si and C in a range of 1 mol % to 20 mol % and an oxide in a range of 1 vol % to 50 vol %. The barrier layer is provided between the magnetic layer and the at least one crystalline underlayer including Mo.
    Type: Application
    Filed: July 9, 2014
    Publication date: January 29, 2015
    Inventors: Lei ZHANG, Tetsuya KANBE, Yuji MURAKAMI, Kazuya NIWA
  • Patent number: 8941950
    Abstract: Various embodiments provide for a heat assisted magnetic recording (HAMR) media comprising: a magnetic recording layer; a barrier layer disposed under the magnetic recording layer; a first underlayer disposed under the barrier layer; and an amorphous seedlayer disposed under the first underlayer. For some embodiments, the recording medium may comprise: a magnetic recording layer including FePt alloy, a CoPt alloy, or a FePd alloy; a barrier layer including MgO, TiC, TiN, CrN, TiCN, ?-WC, TaC, HfC, ZrC, VC, NbC, or NiO; a first underlayer including RuAl-oxide, NiAl, FeAl, AlMn, CuBe, or AlRe; or an amorphous seedlayer including a Cr—X alloy, where X comprises Al, B, C, Cu, Hf, Ho, Mn, Mo, Ni, Ta, Ti, V, W, or Ru.
    Type: Grant
    Filed: May 23, 2012
    Date of Patent: January 27, 2015
    Assignee: WD Media, LLC
    Inventors: Hua Yuan, Antony Ajan, Alexander S. Chernyshov, B. Ramamurthy Acharya
  • Publication number: 20150024238
    Abstract: Hard magnetic exchange-coupled composite structures and perpendicular magnetic recording media including the hard magnetic exchange-coupled composite structures, include a ferrite crystal grain and a soft magnetic metal thin film bounded to the ferrite crystal grain by interfacial bonding on an atomic scale and having a thickness of about 5 nm or less, wherein a region of the soft magnetic metal thin film adjacent to an interface with the ferrite crystal grain includes an amorphous soft magnetic metal film.
    Type: Application
    Filed: January 8, 2014
    Publication date: January 22, 2015
    Applicant: Samsung Electronics Co., Ltd.
    Inventors: Young-min KANG, Kyung-han AHN, Sang-mock LEE
  • Publication number: 20140376127
    Abstract: A magnetic recording medium includes a substrate, a magnetic layer including a FePt alloy having a L10 type structure, and a plurality of underlayers arranged between the substrate and the magnetic layer, wherein at least one of the plurality of underlayers includes TiO2.
    Type: Application
    Filed: June 16, 2014
    Publication date: December 25, 2014
    Inventors: Tetsuya KANBE, Kazuya NIWA, Yuji MURAKAMI, Lei ZHANG
  • Publication number: 20140363700
    Abstract: A magnetic recording medium includes a substrate, a seed layer, an under layer, and a perpendicular recording layer having a granular structure. (Ms·?·?1.5(1?Rs)0.33), Ms, and ? satisfy (Ms·?·?1.5(1?Rs)0.33)?0.1 [?·emu·(mm)?1.5], Ms?450 [emu/cc], and ??1.2. In the above formulas, Ms indicates a saturated magnetization amount, ? indicates the gradient of a M-H loop around a coercive force Hc, ? indicates the thickness of the perpendicular recording layer, and Rs indicates a squareness ratio.
    Type: Application
    Filed: May 29, 2014
    Publication date: December 11, 2014
    Applicant: Sony Corporation
    Inventors: Junichi Tachibana, Noboru Sekiguchi, Tomoe Ozaki
  • Publication number: 20140355156
    Abstract: A magnetic medium for perpendicular magnetic data recording having improved corrosion characteristics and reduced surface roughness. The magnetic medium includes an under-layer and a perpendicular magnetic recording layer formed over the under-layer. The under-layer can be formed of MgO and has an oxygen concentration that is greater at the perpendicular magnetic recording layer than it is away from the perpendicular magnetic recording layer.
    Type: Application
    Filed: May 28, 2013
    Publication date: December 4, 2014
    Applicant: HGST Netherlands B.V.
    Inventors: Akemi Hirotsune, Ikuko Takekuma, Hiroyuki Matsumoto, Oleksandr Mosendz
  • Patent number: 8895163
    Abstract: In a perpendicular magnetic recording medium having, over a substrate, a magnetic recording layer, an underlayer made of Ru or a Ru compound and provided below the magnetic recording layer, a pre-underlayer made of a nonmagnetic crystalline material, and a soft magnetic layer provided below the pre-underlayer, when the difference between the highest point and the lowest point of unevenness of the interface between the soft magnetic layer and the pre-underlayer, derived by a cross-sectional TEM image, is given as an interface roughness (nm) and the distance between the soft magnetic layer and the magnetic recording layer, excluding the soft magnetic layer and the magnetic recording layer, is given as a SUL-MAG distance (nm), interface roughness (nm)?0.4 (nm) and interface roughness×SUL-MAG distance (nm)?12 (nm) are satisfied.
    Type: Grant
    Filed: March 31, 2010
    Date of Patent: November 25, 2014
    Assignee: WD Media (Singapore) Pte. Ltd.
    Inventor: Takahiro Onoue
  • Publication number: 20140342189
    Abstract: There is provided a magnetic recording medium including a base; a seed layer; a foundation layer; and a recording layer, the seed layer being disposed between the base and the foundation layer, having an amorphous state, including an alloy containing Ti, Cr and O, a percentage of Ti being 30 atomic % to 100 atomic % based on a total amount of Ti and Cr contained in the seed layer, and a percentage of O being 15 atomic % or less based on a total amount of Ti, Cr and O contained in the seed layer. Also, a production method thereof is provided.
    Type: Application
    Filed: May 9, 2014
    Publication date: November 20, 2014
    Applicant: Sony Corporation
    Inventors: Junichi Tachibana, Jota Ito, Tomoe Ozaki, Ryoichi Hiratsuka, Noboru Sekiguchi, Tetsuo Endo
  • Publication number: 20140334039
    Abstract: A magnetic medium for perpendicular magnetic data recording, having improved magnetic properties through use of a novel seed layer. The magnetic medium includes a substrate having a seed layer, a magnetic under-layer and a magnetic recording layer formed there-over. The seed layer includes an element selected from a first group of Cr, Co, Fe and Ni, and at least one element that is selected from the other elements of the first group or from a second group consisting of W, Mo and Ru. A buffer layer may be included between the substrate and the seed layer.
    Type: Application
    Filed: May 8, 2013
    Publication date: November 13, 2014
    Applicant: HGST Netherlands B.V.
    Inventors: Akemi Hirotsune, Ikuko Takekuma, Hiroaki Nemoto
  • Patent number: 8867322
    Abstract: Systems and methods for providing thermal barrier bilayers for 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 bilayer on the heat sink layer, the bilayer comprising a first thermal barrier layer on the heat sink layer and an amorphous underlayer on the first thermal barrier layer, and a magnetic recording layer on the amorphous underlayer, wherein a thermal conductivity of the first thermal barrier layer is less than a thermal conductivity of the amorphous underlayer.
    Type: Grant
    Filed: July 1, 2013
    Date of Patent: October 21, 2014
    Assignee: WD Media, LLC
    Inventors: Alexander S. Chernyshov, Hua Yuan, Bincheng Wang, Tomoko Seki, Antony Ajan, B. Ramamurthy Acharya, Gerardo A. Bertero, David Treves
  • Patent number: 8859118
    Abstract: An object is to provide a perpendicular magnetic recording medium including a ground layer that prevents corrosion, while achieving a primary object of promoting finer magnetic particles of a magnetic recording layer and isolation of these magnetic particles. The structure of a perpendicular magnetic recording medium 100 according to the present invention includes, at least on a base 110: a magnetic recording layer 122 on which a signal is recorded; a ground layer 118 provided below the magnetic recording layer; a non-magnetic layer 116 for controlling crystal orientation of the ground layer; and a soft magnetic layer 114 provided below the non-magnetic layer. The ground layer 118 is configured to have three layers including, in an order from bottom, a first ground layer 118a and a second ground layer 118b that contain ruthenium, and a third ground layer 118c that contains a metal.
    Type: Grant
    Filed: January 10, 2011
    Date of Patent: October 14, 2014
    Assignee: WD Media (Singapore) Pte. Ltd.
    Inventors: Toshiaki Tachibana, Takahiro Onoue
  • Publication number: 20140300994
    Abstract: Aspects of the present invention relate to a perpendicular magnetic recording (PMR) media stack and methods for fabricating the same. The PMR media stack has a novel grain isolation initiation layer (GIIL) and/or a novel exchange-break layer (EBL) that can improve the signal-to-noise performance of the PMR media stack. The PMR media stack includes a substrate, a soft underlayer on the substrate, an interlayer positioned on the soft underlayer, and a grain isolation initiation layer (GIIL) positioned on the interlayer, a magnetic layer positioned on the GIIL, and an exchange break layer (EBL) positioned on the magnetic layer. The GIIL and/or EBL includes a CoCrRu-oxide.
    Type: Application
    Filed: June 6, 2013
    Publication date: October 9, 2014
    Inventors: DAEHOON HONG, SY VU, KYONGHA KANG, B. RAMAMURTHY ACHARYA
  • Patent number: 8846219
    Abstract: This document discloses a perpendicular magnetic recording medium in which the magnetic anisotropy of a magnetic recording layer is raised and the thermal stability of recorded signals is improved without changing the conventional stacked configuration. A perpendicular magnetic recording medium is formed by stacking at least an intermediate layer, a second underlayer, and a magnetic recording layer in this order on a nonmagnetic base. The intermediate layer is either a single layer of Ru or a Ru-based alloy, or a stacked structure of a nonmagnetic alloy film including Co and Cr and a film of Ru or a Ru-based alloy. The second underlayer includes Co in the range from 30 at % to 75 at %, Cr in the range from 20 at % to 60 at %, and W in the range from 0.1 at % to 10 at %, and has a thickness in the range from 0.1 nm to 1.0 nm.
    Type: Grant
    Filed: March 9, 2012
    Date of Patent: September 30, 2014
    Assignee: Fuji Electric Co., Ltd.
    Inventor: Yasuaki Hozumi
  • Publication number: 20140287268
    Abstract: Provided herein is an apparatus, including a plurality of spaced apart perpendicular magnetic elements. Each of the magnetic elements includes a respective discrete magnetic domain and each of the magnetic elements includes a magnetic recording layer comprising a Co1-x-yPtxCry alloy material, where 0.05?x?0.35 and 0?y?0.15.
    Type: Application
    Filed: February 12, 2014
    Publication date: September 25, 2014
    Applicant: Seagate Technology LLC
    Inventors: Dieter K. Weller, Hans J. Richter, Samuel D. Harkness, IV, Erol Girt
  • Patent number: 8841007
    Abstract: Various magnetic stack embodiments may be constructed with a soft magnetic underlayer (SUL) having a first thickness disposed between a substrate and a magnetic recording layer. A heatsink may have a second thickness and be disposed between the SUL and the magnetic recording layer. The first and second thicknesses may each be tuned to provide predetermined thermal conductivity and magnetic permeability throughout the data media.
    Type: Grant
    Filed: April 27, 2012
    Date of Patent: September 23, 2014
    Assignee: Seagate Technology LLC
    Inventors: Kai-Chieh Chang, Yinfong Ding, Ganping Ju, Timothy Klemmer, Yukiko Kubota, Thomas P. Nolan, Yingguo Peng, Jan-Ulrich Thiele, Qihong Wu, Xiaobin Zhu
  • Publication number: 20140242419
    Abstract: There is provided a perpendicular recording medium comprising: a substrate with a seed layer formed thereon; a soft underlayer formed on the seed layer; an orientation control layer formed on the soft underlayer; an intermediate layer formed on the orientation control layer; a flash layer formed on the intermediate layer, the flash layer comprising an oxide; and a recording layer formed on the flash layer.
    Type: Application
    Filed: February 24, 2014
    Publication date: August 28, 2014
    Applicant: SHOWA DENKO HD SINGAPORE PTE LTD.
    Inventors: Amarendra SINGH, Ben Beng Beng LIM, Hiroshi KANAZAWA, Voon Siang KHOANG
  • Publication number: 20140234665
    Abstract: A perpendicular magnetic recording disk includes a template layer below a Ru or Ru alloy underlayer, with a granular Co alloy recording layer formed on the underlayer. substrate. The template layer comprises nanoparticles spaced-apart and partially embedded within a polymer material, with the nanoparticles protruding above the surface of the polymer material. A seed layer covers the surface of the polymer material and the protruding nanoparticles and an underlayer of Ru or a Ru alloy covers the seed layer. The protruding nanoparticles serve as the controlled nucleation sites for the Ru or Ru alloy atoms. The nanoparticle-to-nanoparticle distances can be controlled during the formation of the template layer. This enables control of the Co alloy grain diameter distribution as well as grain-to-grain distance distribution.
    Type: Application
    Filed: February 20, 2013
    Publication date: August 21, 2014
    Applicant: HGST NETHERLANDS B.V.
    Inventors: Bruce Alvin Gurney, Ricardo Ruiz, Manfred Ernst Schabes, Kentaro Takano, Shi-Ling Chang Wang, Qing Zhu, Han Zou
  • Patent number: 8792313
    Abstract: A magnetic recording medium of the present invention includes an under layer formed on a substrate, and a magnetic layer, formed on the under layer, which contains an alloy having an L10-type crystal structure as a main component. The under layer includes, in order from the substrate side, a first under layer with a lattice constant a of 2.87 ??a<3.04 ?, a second under layer having a BCC structure with a lattice constant a of 3.04 ??a<3.18 ?, a third under layer having a BCC structure with a lattice constant a of 3.18 ??a<3.31 ?, and an upper under layer having a NaCl-type crystal structure. The first under layer has a B2 structure, or has a BCC structure containing Cr as a main component. In the magnetic recording medium of the present invention, information is recorded using a heat-assisted magnetic recording type, or a microwave-assisted magnetic recording type.
    Type: Grant
    Filed: August 21, 2013
    Date of Patent: July 29, 2014
    Assignee: Showa Denko K.K.
    Inventors: Kazuya Niwa, Tetsuya Kanbe, Yuji Murakami, Lei Zhang
  • Patent number: 8787130
    Abstract: Systems and methods for providing heat assisted magnetic recording (HAMR) media configured to couple energy from a near field transducer (NFT) are provided. One such method includes providing a magnetic recording layer including an L10 ordered FePt or an L10 ordered CoPt, selecting a plurality of preselected parameters for a coupling layer, the preselected parameters including a material, a preselected deposition temperature, and a preselected thickness, and depositing the coupling layer directly on the magnetic recording layer using the preselected parameters such that the coupling layer has an extinction coefficient greater than 0.1.
    Type: Grant
    Filed: June 29, 2013
    Date of Patent: July 22, 2014
    Assignee: WD Media, LLC
    Inventors: Hua Yuan, Bogdan F. Valcu, Antony Ajan, B. Ramamurthy Acharya, Alexander S. Chernyshov, Paul C. Dorsey
  • Patent number: 8771849
    Abstract: Embodiments of the present invention help allow accurate control of the magnetization reversal in a magnetic recording layer in small reversal units, whereby high-density recording can be achieved. According to one embodiment, by forming an intermediate layer having a granular structure similar to that of the magnetic recording layer below the magnetic recording layer, a continuous crystal grain boundary is formed at the interface between the magnetic recording layer and the intermediate layer, thereby preventing incomplete formation of the crystal grain boundary found in the initial growth layer of the magnetic recording layer. The intermediate layer comprises a non-magnetic alloy comprising Co and Cr as its main components and an oxide such as Al, Cr, Hf. Mg, Nb, Si, Ta, Ti and Zr. Further, the average content of the oxygen element in the intermediate layer is in the range from 6 at % to 20 at %.
    Type: Grant
    Filed: October 21, 2008
    Date of Patent: July 8, 2014
    Assignee: HGST Netherlands B.V.
    Inventors: Hiroaki Nemoto, Ikuko Takekuma, Ichiro Tamai, Yoshiyuki Hirayama
  • Publication number: 20140186658
    Abstract: An apparatus and method are provided for improving perpendicular magnetic recording media. The present invention provides media, and a method of fabricating media in a cost-effective manner, with a reduced ruthenium (Ru) content interlayer structure, while meeting media performance requirements. A perpendicular magnetic recording medium is provided comprising a non-magnetic substrate having a surface, and a layer stack situated on the substrate surface. The layer stack comprises, in overlying sequence from the substrate surface a magnetically soft underlayer; an amorphous or crystalline, non-magnetic seed layer; an interlayer structure for crystallographically orienting a layer of a perpendicular magnetic recording material situated on the underlayer; and at least one crystallographically oriented, magnetically hard, perpendicular magnetic recording layer situated on the interlayer structure.
    Type: Application
    Filed: January 20, 2014
    Publication date: July 3, 2014
    Applicant: SEAGATE TECHNOLOGY LLC
    Inventors: Shoutao Wang, Weilu Xu, Chung-hee Chang, Xiaoguang Ma, Mark Johnson, Abebe Hailu, Charles Chen
  • Patent number: 8758912
    Abstract: Embodiments of the present invention include a recording medium comprising: a hard magnetic recording layer and an interlayer disposed under the hard magnetic recording layer, wherein the interlayer comprises an upper layer of Ru-based alloy and a lower layer of RuCo or ReCo alloy. Generally for embodiments of the present invention, the lower layer of RuCo or ReCo alloy is formed over a seed layer using a low-pressure sputter process, and the upper layer of Ru-based alloy is formed over the lower layer using a high-pressure sputter process.
    Type: Grant
    Filed: September 16, 2011
    Date of Patent: June 24, 2014
    Assignee: WD Media, LLC
    Inventors: Kumar Srinivasan, B. Ramamurthy Acharya
  • Publication number: 20140153128
    Abstract: According to one embodiment, a magnetic recording medium includes a magnetic recording layer formed on a substrate and including magnetic grains and a grain boundary formed between the magnetic grains, the grain boundary includes a first grain boundary having a first thermal conductivity, and a second grain boundary formed on the first grain boundary and having a second thermal conductivity different from the first thermal conductivity, and at least one of the first and second grain boundaries suppresses thermal conduction.
    Type: Application
    Filed: March 11, 2013
    Publication date: June 5, 2014
    Applicant: KABUSHIKI KAISHA TOSHIBA
    Inventors: Hironori TEGURI, Akira WATANABE, Tomoko TAGUCHI
  • Publication number: 20140139952
    Abstract: According to one embodiment, there is provided a thin magnetic film having a negative anisotropy of ?6×106 erg/cm3 or less and including, on at least a nonmagnetic substrate, at least one seed layer made of a metal or metal compound, a ruthenium underlayer for controlling the orientation of an immediately overlying layer, and a magnetic layer having negative anisotropy in the normal line direction perpendicular to a surface of the magnetic layer and mainly containing Co and Ir, wherein the additive element concentration of Ir in the magnetic layer is 10 (inclusive) to 45 (inclusive) at %.
    Type: Application
    Filed: July 19, 2013
    Publication date: May 22, 2014
    Inventors: Akihiko Takeo, Akira Kikitsu, Tomoyuki Maeda, Migaku Takahashi, Shin Saito, Ken Inoue, Gohei Kurokawa