Single Magnetic Layer And Single Underlayer Patents (Class 428/832)
  • Patent number: 10923147
    Abstract: Magnetic media including a magnetic recording layer structure of at least six magnetic recording sublayers and at least six non-magnetic exchange control sublayers in an alternating pattern are provided. The magnetic recording layer structure includes a gradient of platinum content across the magnetic recording sublayers such that a top magnetic recording sublayer has a lowest platinum content and a bottom magnetic recording sublayer has a highest platinum content. In one such case, the magnetic media includes a substrate and the magnetic recording layer structure on the substrate. In another case, a method of fabricating such magnetic media is provided.
    Type: Grant
    Filed: April 20, 2018
    Date of Patent: February 16, 2021
    Assignee: WESTERN DIGITAL TECHNOLOGIES, INC.
    Inventors: Kai Tang, Arien Michael Ghaderi, Tuqiang Li, Chi Ho Lo
  • Patent number: 10614953
    Abstract: Various embodiments to mitigate the contamination of electroplated cobalt-platinum films on substrates are described. In one embodiment, a device includes a substrate, a titanium nitride diffusion barrier layer formed upon the substrate, a titanium layer formed upon the titanium nitride diffusion barrier layer, a platinum seed layer, and a cobalt-platinum magnetic layer formed upon the platinum seed layer. Based in part on the use of the titanium nitride diffusion barrier layer and/or the platinum seed layer, improvements in the interfaces between the layers can be achieved after annealing, with less delamination, and with substantial improvements in the magnetic properties of the cobalt-platinum magnetic layer. Further, the cobalt-platinum magnetic layer can be formed at a relatively thin thickness of hundreds of nanometers to a few microns while still maintaining good magnetic properties.
    Type: Grant
    Filed: January 12, 2017
    Date of Patent: April 7, 2020
    Assignee: University of Florida Research Foundation, Inc.
    Inventors: David P. Arnold, Ololade D. Oniku
  • Patent number: 10490733
    Abstract: A magnetic element is disclosed wherein a composite seed layer such as TaN/Mg enhances perpendicular magnetic anisotropy (PMA) in an overlying magnetic layer that may be a reference layer, free layer, or dipole layer. The first seed layer is selected from one or more of Ta, Zr, Nb, TaN, ZrN, NbN, and Ru. The second seed layer is selected from one or more of Mg, Sr, Ti, Al, V, Hf, B, and Si. A growth promoting layer made of NiCr or an alloy thereof is inserted between the seed layer and magnetic layer. In some embodiments, a first composite seed layer/NiCr stack is formed below the reference layer, and a second composite seed layer/NiCr stack is formed between the free layer and a dipole layer. The magnetic element has thermal stability to at least 400° C.
    Type: Grant
    Filed: November 7, 2016
    Date of Patent: November 26, 2019
    Assignee: TAIWAN SEMICONDUCTOR MANUFACTURING COMPANY, LTD.
    Inventors: Guenole Jan, Ru-Ying Tong
  • Patent number: 10453487
    Abstract: A stack includes a substrate and a magnetic recording layer. Disposed between the substrate and magnetic recording layer is an MgO—Ti(ON) layer.
    Type: Grant
    Filed: December 10, 2015
    Date of Patent: October 22, 2019
    Assignee: Seagate Technology LLC
    Inventors: Yukiko Kubota, Timothy John Klemmer, Kai Chieh Chang, Li Gao, Yinfeng Ding, Yingguo Peng, Jan-Ulrich Thiele
  • Patent number: 10090458
    Abstract: A magnetic memory device includes a reference magnetic structure, a free magnetic structure, and a tunnel barrier pattern between the reference magnetic structure and the free magnetic structure. The reference magnetic structure includes a first pinned pattern, a second pinned pattern between the first pinned pattern and the tunnel barrier pattern, and an exchange coupling pattern between the first and the second pinned pattern. The second pinned pattern includes a first magnetic pattern adjacent the exchange coupling pattern, a second magnetic pattern adjacent the tunnel barrier pattern, a third magnetic pattern between the first and the second magnetic pattern, a first non-magnetic pattern between the first and the third magnetic pattern, and a second non-magnetic pattern between the second and the third magnetic pattern. The first non-magnetic pattern has a different crystal structure from the second non-magnetic pattern, and at least a portion of the third magnetic pattern is amorphous.
    Type: Grant
    Filed: June 8, 2017
    Date of Patent: October 2, 2018
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Sung Chul Lee, Ki Woong Kim, Sang Hwan Park, Sechung Oh
  • Patent number: 9959895
    Abstract: A method for manufacturing a magnetic recording medium is provided. An orientation control layer is deposited on a non-magnetic substrate to control an orientation of a layer located directly thereon, and a perpendicular magnetic layer whose easy axis of magnetization is mainly oriented perpendicular to the non-magnetic substrate is deposited thereon. In depositing the orientation control layer, a first granular structure layer containing Ru or a material mainly made of Ru and a first oxide having a melting point of 1000 degrees C. or lower are deposited by sputtering. In depositing the perpendicular magnetic layer, a second granular structure layer containing magnetic particles and a second oxide having a melting point of 1000 degrees C. or lower are deposited by sputtering, and the magnetic particles are grown so as to form a columnar crystal continuing in a thickness direction. The columnar crystal includes crystal grains constituting the orientation control layer.
    Type: Grant
    Filed: July 30, 2014
    Date of Patent: May 1, 2018
    Assignee: SHOWA DENKO K.K.
    Inventors: Ken Inoue, Kenji Shimizu, Gohei Kurokawa, Haruhisa Ohashi
  • Patent number: 9818441
    Abstract: Disclosed is a thermally assisted magnetic recording medium comprising a substrate, a plurality of underlayers formed on the substrate, and a magnetic layer which is formed on the underlayers and predominantly comprised of an alloy having a L10 structure, characterized in that at least one of the underlayers is predominantly comprised of MgO and comprises at least one oxide selected from SiO2, TiO2, Cr2O3, Al2O3, Ta2O5, ZrO2, Y2O3, CeO2, MnO, TiO and ZnO. The thermally assisted magnetic recording medium has a magnetic layer comprised of fine magnetic crystal grains, exhibiting a sufficiently weak exchange coupling between magnetic grains, and having a minimized coercive force dispersion.
    Type: Grant
    Filed: February 3, 2011
    Date of Patent: November 14, 2017
    Assignee: SHOWA DENKO K.K.
    Inventors: Tetsuya Kanbe, Atsushi Hashimoto, Takayuki Fukushima
  • Patent number: 9540724
    Abstract: Provided is a sputtering target for a magnetic recording film. The sputtering target has a peak intensity ratio (IG/ID) of a G-band to a D-band of 5.0 or more in Raman scattering spectrometry. It is an object of the present invention to produce a magnetic thin film having a granular structure without using a high cost co-sputtering apparatus and to provide a sputtering target, in particular, an Fe—Pt-based sputtering target for a magnetic recording film, where carbon particles are dispersed in the target. Since carbon is a material which is not susceptible to being sintered and is susceptible to form aggregates, a conventional carbon-containing sputtering target has the problem that detachment of carbon lumps occurs during sputtering to result in generation of a large number of particles on the film. The present invention also addresses the problem of providing a high density sputtering target that can overcome the disadvantages.
    Type: Grant
    Filed: May 22, 2013
    Date of Patent: January 10, 2017
    Assignee: JX Nippon Mining & Metals Corporation
    Inventor: Shini-ichi Ogino
  • Patent number: 9245567
    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: Grant
    Filed: June 16, 2014
    Date of Patent: January 26, 2016
    Assignee: SHOWA DENKO K.K.
    Inventors: Tetsuya Kanbe, Kazuya Niwa, Yuji Murakami, Lei Zhang
  • Patent number: 9245566
    Abstract: A perpendicular magnetic media includes a substrate, a patterned template, a seed layer and a magnetic layer. The patterned template is formed on the substrate and includes a plurality of growth sites that are evenly spaced apart from each other. The seed layer is formed over the patterned template and the exposed areas of the substrate. Magnetic material is sputter deposited onto the seed layer with one grain of the magnetic material nucleated over each of the growth sites. The grain size distribution of the magnetic material is reduced by controlling the locations of the growth sites which optimizes the performance of the perpendicular magnetic media.
    Type: Grant
    Filed: January 13, 2014
    Date of Patent: January 26, 2016
    Assignee: Seagate Technology LLC
    Inventors: Shuaigang Xiao, Thomas Young Chang, Yingguo Peng, David S. Kuo, Kaizhong Gao, Thomas P. Nolan, Ganping Ju
  • Patent number: 9230588
    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: Grant
    Filed: July 9, 2014
    Date of Patent: January 5, 2016
    Assignee: SHOWA DENKO K.K.
    Inventors: Lei Zhang, Tetsuya Kanbe, Yuji Murakami, Kazuya Niwa
  • Patent number: 9183867
    Abstract: Systems and methods for forming implanted capping layers in magnetic media for magnetic recording are provided. One such method includes providing an underlayer, providing a magnetic recording layer on the underlayer, the magnetic recording layer including a bottom surface and a top surface where the bottom surface is between the top surface and the underlayer, and implanting a capping material in the top surface of the magnetic recording layer using a direct implantation technique or an indirect implantation technique.
    Type: Grant
    Filed: February 21, 2013
    Date of Patent: November 10, 2015
    Assignee: WD Media, LLC
    Inventors: Gerardo A. Bertero, Michael Alex
  • Patent number: 9099142
    Abstract: The embodiments disclose a data storage device including a thickness gradient heat sink layer deposited over a heat sink layer deposited over a substrate, a thickness gradient non-magnetic thermal resist layer deposited over the thickness gradient heat sink layer, and a magnetic layer deposited over the thickness gradient non-magnetic thermal resist layer.
    Type: Grant
    Filed: March 6, 2014
    Date of Patent: August 4, 2015
    Assignee: Seagate Technology LLC
    Inventor: René van de Veerdonk
  • 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
  • Patent number: 9012046
    Abstract: According to one embodiment, a magnetic recording medium is formed by performing gas ion irradiation by using a magnetism deactivating gas on a stack including a perpendicular magnetic recording layer, an Ru nonmagnetic underlayer containing a magnetism deactivating element selected from chromium, titanium, and silicon, and a nonmagnetic substrate. Before gas ion irradiation, the perpendicular magnetic recording layer contains platinum and at least one of iron and cobalt. Gas ion irradiation is performed using nitrogen gas alone or a gas mixture of nitrogen gas and at least one gas selected from the group consisting of helium, hydrogen, and B2H6.
    Type: Grant
    Filed: November 10, 2011
    Date of Patent: April 21, 2015
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Takeshi Iwasaki, Kaori Kimura, Hiroyuki Hyodo, Masatoshi Sakurai
  • Patent number: 9000764
    Abstract: A method for producing printed magnetic functional elements for resistance sensors and printed magnetic functional elements. The invention refers to the field of electronics and relates to a method for producing resistance sensors, such as can be used, for example, in magnetic data storage for read sensors or in the automobile industry. The disclosure includes a simple and cost-effective production method and to obtain such printed magnetic functional elements with properties that can be adjusted as desire, in which a magnetic material is deposited onto a substrate as a film, is removed from the substrate and divided into several components and these components are applied on a substrate by means of printing technologies. Aspects are also directed to a printed magnetic functional element for resistance sensors of several components of a film, wherein at least 5% of the components of the functional element have a magnetoimpedance effect.
    Type: Grant
    Filed: June 20, 2012
    Date of Patent: April 7, 2015
    Assignee: Leibniz-Institut fuer Festkoerper und Werkstoffforschung Dresden e.V.
    Inventors: Daniil Karnaushenko, Denys Makarov, Oliver G. Schmidt
  • Publication number: 20150093598
    Abstract: A stack includes a substrate and a magnetic recording layer. Disposed between the substrate and magnetic recording layer is an MgO—Ti(ON) layer.
    Type: Application
    Filed: October 31, 2013
    Publication date: April 2, 2015
    Applicant: Seagate Technology LLC
    Inventors: Yukiko Kubota, Timothy J. Klemmer, Kai Chieh Chang, Li Gao, Yinfeng Ding, Yingguo Peng, Jan-Ulrich Thiele
  • Publication number: 20150064500
    Abstract: An aspect of the present invention relates to a composition, which is a composition for a magnetic recording medium and comprises an isocyanate compound in the form of an adduct of a polyhydroxyl compound having one or more aromatic carbon rings and three or more hydroxyl groups per molecule with a polyisocyanate having two or more isocyanate groups per molecule.
    Type: Application
    Filed: August 29, 2014
    Publication date: March 5, 2015
    Applicant: FUJIFILM Corporation
    Inventors: Toshihide AOSHIMA, Kazutoshi KATAYAMA
  • 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: 20150004438
    Abstract: According to one embodiment, there is provided a method for forming a pattern including forming an island-like metal underlayer comprised of a first metal, a phase-separated release layer including a first metal, a second metal, and a metal oxide, a mask layer, and a resist layer on a processed layer in this order, forming a concave-convex pattern on the resist layer, transferring the pattern to the mask layer, the phase-separated release layer, and the processed layer in this order, dissolving the phase-separated release layer using a peeling liquid for dissolving the first metal and the second metal, and removing the mask layer from the processed layer to expose the concave-convex pattern.
    Type: Application
    Filed: October 22, 2013
    Publication date: January 1, 2015
    Applicant: Kabushiki Kaisha Toshiba
    Inventors: Kazutaka Takizawa, Akira Watanabe, Kaori Kimura, Takeshi Iwasaki, Akihiko Takeo
  • Patent number: 8920948
    Abstract: According to one embodiment, a patterned magnetic storage medium is disclosed herein. The magnetic storage medium includes a pattern formed on a substrate. The pattern includes at least a first and second feature and an edge defined between the first and second features. Additionally, the magnetic storage medium includes a magnetic layer formed on the pattern. The magnetic layer includes grains separated by a non-magnetic segregant boundary. The segregant boundary is positioned above the edge of the pattern.
    Type: Grant
    Filed: December 31, 2011
    Date of Patent: December 30, 2014
    Assignee: HGST Netherlands B.V.
    Inventors: Liesl Folks, Michael K. Grobis, Dan S. Kercher, Ricardo Ruiz, Kentaro Takano, Bruce D. Terris, Qing Zhu
  • Publication number: 20140363701
    Abstract: A mechanism is provided for a structure with perpendicular magnetic anisotropy. A bottom oxide layer is disposed, and a magnetic layer is disposed adjacent to the bottom oxide layer. The magnetic layer includes iron and is magnetized perpendicularly to a plane of the magnetic layer. A top oxide layer is disposed adjacent to the magnetic layer.
    Type: Application
    Filed: June 6, 2013
    Publication date: December 11, 2014
    Inventors: Guohan Hu, Daniel Worledge
  • 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
  • Publication number: 20140342188
    Abstract: An apparatus includes a substrate and a magnetic layer coupled to the substrate. The magnetic layer includes an alloy that has magnetic hardness that is a function of the degree of chemical ordering of the alloy. The degree of chemical ordering of the alloy in a first portion of the magnetic layer is greater than the degree of chemical ordering of the alloy in a second portion of the magnetic layer, and the first portion of the magnetic layer is closer to the substrate than the second portion of the magnetic layer.
    Type: Application
    Filed: August 5, 2014
    Publication date: November 20, 2014
    Inventors: Yingguo Peng, Xiaowei Wu, Ganping Ju, Bin Lu
  • Publication number: 20140306303
    Abstract: A magnetic thin film deposition having PMA (perpendicular magnetic anisotropy) is a multilayered fabrication of materials having differing crystal symmetries that smoothly transition by use of a seed layer that promotes symmetry matching. An interface between layers in the deposition, such as an interface between a layer of MgO and an Fe-containing ferromagnetic layer, is a source of perpendicular magnetic anisotropy which then propagates throughout the remainder of the deposition by means of the symmetry matching seed layer.
    Type: Application
    Filed: April 16, 2013
    Publication date: October 16, 2014
    Inventors: Takahiro Moriyama, Yu-Jen Wang, Ru-Ying Tong
  • Publication number: 20140233363
    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: Application
    Filed: September 21, 2012
    Publication date: August 21, 2014
    Inventors: Mark Kryder, Steven D. Granz, Katayun Barmak Vaziri
  • Publication number: 20140212692
    Abstract: A magnetic recording medium, that makes it possible to reduce head flying height, includes a nonmagnetic substrate and provided thereon, in the order recited; an underlayer; a magnetic layer; a protective layer comprised of carbon; and a lubricating layer composed of a lubricant mixture including a lubricant represented by Formula (I) below where m is an integer equal to or greater than 1; and a lubricant represented by Formula (II) below where p and q are integers equal to or greater than 0, provided that p=q=0 is excluded.
    Type: Application
    Filed: November 2, 2012
    Publication date: July 31, 2014
    Applicant: FUJI ELECTRIC CO., LTD.
    Inventors: Takako Matsumoto, Takeshi Watanabe
  • Publication number: 20140212693
    Abstract: The magnetic recording medium includes a magnetic layer containing a ferromagnetic powder and a binder on a nonmagnetic support, wherein the ferromagnetic powder is an ?-iron oxide powder, and the magnetic layer comprises a compound comprising at least one substituent selected from the group consisting of a hydroxyl group and a quaternary ammonium salt group.
    Type: Application
    Filed: January 30, 2014
    Publication date: July 31, 2014
    Applicant: FUJIFILM Corporation
    Inventor: Yasushi HATTORI
  • Publication number: 20140204484
    Abstract: A method of manufacturing a magnetic recording medium, includes at least: forming an orientation control layer 3 that controls orientation of an immediately above layer thereof on a non-magnetic substrate 1; and forming a perpendicular magnetic layer 4 in which an easy axis of magnetization is mainly perpendicularly orientated to the non-magnetic substrate 1, in which the forming of the orientation control layer 3 includes forming a granular layer having a granular structure that includes Ru or a material in which Ru is a main component and an oxide having a melting point which is greater than or equal to 450° C. and less than or equal to 1000° C., by a sputtering method, and the forming of the perpendicular magnetic layer 4 includes growing crystal grains to form columnar crystals that are continuous in a thickness direction together with crystal grains that form the orientation control layer 3.
    Type: Application
    Filed: January 22, 2014
    Publication date: July 24, 2014
    Applicant: SHOWA DENKO K.K.
    Inventors: Ken INOUE, Gohei KUROKAWA, Haruhisa OHASHI
  • 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
  • Publication number: 20140133050
    Abstract: A magnetic recording medium according to one embodiment includes at least a ground layer above a non-magnetic substrate; a magnetic recording layer above the ground layer; and an overcoat above the magnetic recording layer, the overcoat characterized in that said overcoat is an amorphous carbon film, wherein a hydrogen content in the overcoat in a center layer thereof in a film thickness direction of said overcoat is from 0.1 atom % to 1.0 atom %. Additional products and methods are also presented.
    Type: Application
    Filed: September 11, 2013
    Publication date: May 15, 2014
    Applicant: HGST Netherlands B.V.
    Inventors: Toru Matsumura, Hiroshi Inaba, Hiroyuki Matsumoto
  • Patent number: 8697261
    Abstract: An object of the present invention is to increase an electromagnetic transducing characteristic (in particular, SNR) by further promoting separation and isolation of magnetic grains of a magnetic recording layer (122) in a perpendicular magnetic recording medium (100).
    Type: Grant
    Filed: March 25, 2009
    Date of Patent: April 15, 2014
    Assignee: WD Media (Singapore) Pte. Ltd.
    Inventor: Teiichiro Umezawa
  • Publication number: 20140093746
    Abstract: An apparatus includes a disk substrate and a soft underlayer overlying the disk substrate. A magnetic seed layer overlies the soft underlayer, wherein the magnetic seed layer is formed by a hexagonal close-packed lattice material and has in-plane magnetic anisotropy.
    Type: Application
    Filed: September 30, 2012
    Publication date: April 3, 2014
    Applicant: SEAGATE TECHNOLOGY LLC
    Inventors: Antonio Javier Zambano, Li Tang, John David Westwood
  • Publication number: 20140093748
    Abstract: A magnetic stack includes a substrate, a magnetic recording layer, and a TiN—X layer disposed between the substrate and the magnetic recording layer. In the TiN—X layer, X is a dopant comprising at least one of MgO, TiO, TiO2, ZrN, ZrO, ZrO2, HfN, HfO, AlN, and Al2O3.
    Type: Application
    Filed: September 24, 2013
    Publication date: April 3, 2014
    Applicant: Seagate Technology LLC
    Inventors: Jingsheng Chen, Huihui Li, Ganping Ju, Yingguo Peng
  • Publication number: 20140087211
    Abstract: The magnetic recording medium coating composition includes carbon black; iron oxide; at least one organic solvent selected from the group consisting of methyl ethyl ketone, cyclohexanone, and isophorone; an organic tertiary amine selected from the group consisting of an aliphatic tertiary monoamine and an alicyclic tertiary amine; and an organic acid.
    Type: Application
    Filed: September 26, 2013
    Publication date: March 27, 2014
    Applicant: FUJIFILM CORPORATION
    Inventor: Kazufumi OMURA
  • Publication number: 20140030552
    Abstract: A perpendicular magnetic recording medium is disclosed. The perpendicular magnetic recording medium includes a first layer, and a second layer positioned immediately below the first layer. Among the materials in the first layer and the second layer, if the interface energy when two different materials—material a and material b—are in contact is defined as Ei(a//b), the surface energy when material a exists independently is defined as Es(a), and the energy resulting by subtracting the sum of the respective surface energies (?Es) from the interface energy is defined as G(a//b), then when G(1//3)<G(1//4) holds, either G(2//4) or G(1//3) is the minimum among G(1//3), G(1//4), G(2//3) and G(2//4), and when G(1//3)<G(1//4) does not hold, G(2//4) is the minimum among G(1//3), G(1//4), G(2//3) and G(2//4).
    Type: Application
    Filed: June 4, 2013
    Publication date: January 30, 2014
    Inventors: Yuki INABA, Takayuki HIROSE
  • Publication number: 20140030553
    Abstract: The invention relates to the fields of physics and materials science, more particularly to a magneto-electronic component that can he used as a digital memory, for example. The aim of the invention is to design a magneto-electronic component which can be used as a racetrack memory. Said aim is achieved by a magneto-electronic component consisting of an insulating thin film, on which an elongate element made of a magnetic material and electrically conductive contacts are located, and another insulating thin film, said arrangement being jointly rolled up. Said aim is also achieved by a method in which at least one elongate element made of a magnetic material is applied to an insulating thin film, electrical contacts are also applied, and another insulating thin film is applied thereto, the stack of layers being arranged so as to have a strain gradient.
    Type: Application
    Filed: March 9, 2012
    Publication date: January 30, 2014
    Applicant: LEIBNIZ-INSTITUT FUER FESTKOERPER-UND WERKSTOFFFOR SCHUNG DRESDEN E.V.
    Inventors: Denys Makarov, Oliver G. Schmidt
  • Patent number: 8582416
    Abstract: The heat-assisted magnetic recording medium of the present invention has a substrate, an under layer formed on the substrate, and a magnetic layer formed on the under layer, in which the magnetic layer includes an alloy having a L10 structure as a principle component, and the under layer is constituted by a first under layer made of an amorphous alloy or an alloy having a microcrystalline structure, a second under layer made of Cr or an alloy which contains Cr as a principle component and has a BCC structure, a third under layer made of a metal or an alloy having a BCC structure with a lattice constant of 2.98 ? or more, and a fourth under layer made of MgO.
    Type: Grant
    Filed: January 25, 2013
    Date of Patent: November 12, 2013
    Assignee: Showa Denko K.K.
    Inventors: Tetsuya Kanbe, Atsushi Hashimoto, Takayuki Fukushima
  • Patent number: 8574730
    Abstract: Information storage devices and methods of manufacturing the same are provided. A magnetic track of the information storage device includes a magnetic layer in which at least one magnetic domain forming region and at least one magnetic domain wall forming region are alternately disposed in a lengthwise direction. The at least one magnetic domain forming regions has a different magnetic anisotropic energy relative to the at least one magnetic domain wall forming region. An intermediate layer is formed under the magnetic layer. The intermediate layer includes at least one first material region and at least one second material region. Each of the at least one first material regions and the at least one second material regions corresponds to one of the at least one magnetic domain forming regions and the at least one magnetic domain wall forming regions.
    Type: Grant
    Filed: June 11, 2008
    Date of Patent: November 5, 2013
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Young-jin Cho, Sung-chul Lee, Kwang-seok Kim, Ji-young Bae, Sun-ae Seo, Chang-won Lee
  • Patent number: 8546001
    Abstract: Patterned media and associated methods of fabrication are provided in which vertical magnetic grains are grown on a patterned seed layer. The patterned seed layer includes a matrix of islands of a first seed material. Each island of first seed material is separated from other islands by a region of second seed material. The first seed material is selected to initiate growth of magnetic material, and the second seed material is selected to initiate growth of non-magnetic material. Subsequently, magnetic material is grown on the first seed material and non-magnetic material is grown on the second seed material. Deposition may be simultaneously. The magnetic and non-magnetic materials form well-defined vertical columns over the first and second seed materials respectively. Thus, each island behaves as an isolated magnetic unit, which switches independently from its neighbor units, which are magnetically separated by the non-magnetic material.
    Type: Grant
    Filed: June 30, 2010
    Date of Patent: October 1, 2013
    Assignee: HGST Netherlands, B.V.
    Inventors: Elizabeth Dobisz, David Margulies, Olav Hellwig, Xiao Z. Wu
  • Patent number: 8542569
    Abstract: A heat-assisted magnetic recording medium includes a substrate, a plurality of foundation layers, and a magnetic layer. The plurality of foundation layers are provided on the substrate and include a first layer containing MnO. The magnetic layer is provided on the plurality of layers and includes an alloy as a main ingredient. The alloy has an L10 structure.
    Type: Grant
    Filed: February 14, 2012
    Date of Patent: September 24, 2013
    Assignee: Showa Denko K.K.
    Inventors: Tetsuya Kanbe, Kazuya Niwa, Katsuya Hara
  • Publication number: 20130170065
    Abstract: According to one embodiment, a patterned magnetic storage medium is disclosed herein. The magnetic storage medium includes a pattern formed on a substrate. The pattern includes at least a first and second feature and an edge defined between the first and second features. Additionally, the magnetic storage medium includes a magnetic layer formed on the pattern. The magnetic layer includes grains separated by a non-magnetic segregant boundary. The segregant boundary is positioned above the edge of the pattern.
    Type: Application
    Filed: December 31, 2011
    Publication date: July 4, 2013
    Inventors: Liesl Folks, Michael K. Grobis, Dan S. Kercher, Ricardo Ruiz, Kentaro Takano, Bruce D. Terris, Qing Zhu
  • Publication number: 20130155543
    Abstract: In one embodiment, a patterned magnetic recording medium includes an interlayer positioned above a nonmagnetic substrate, wherein portions of the interlayer have good crystal orientation separated by portions of the interlayer which have poor crystal orientation, and a magnetic recording layer positioned above the interlayer. The magnetic recording layer is defined by a pattern which includes magnetic portions having good crystal orientation above the portions of the interlayer having good crystal orientation separated by magnetic portions having poor crystal orientation above the portions of the interlayer having poor crystal orientation. In another embodiment, a method is proposed for producing the patterned magnetic recording medium as described above which includes forming an interlayer and a recording layer above the interlayer, and imparting a template pattern to the interlayer using an organic resist during or after formation of the interlayer.
    Type: Application
    Filed: December 15, 2011
    Publication date: June 20, 2013
    Applicant: Hitachi Global Storage Technologies Netherlands B.V.
    Inventors: Yoshinori Honda, Yoshiyuki Hirayama, Masayoshi Shimizu, Taku Iwase
  • Publication number: 20130108890
    Abstract: The present invention is related to a target, which is a magnesium monoxide-based (MgO-based) composite having cubic crystal structure of MgO, wherein the MgO-based composite includes MgO and one or more oxides. Using MgO-based composite to form an underlayer material can improve the bonding strength among particles in the target, and then effectively reduce the falling of particles from the targets during sputtering. In addition, the MgO-based composite still maintains the cubic crystal structure of MgO, which is beneficial to make a MgO-based composites as an underlayer material in a magnetic recording medium. The invention is also related to an underlayer material for cobalt-based (Co-based) or iron-based (Fe-based) magnetic recording media. The invention is further related to a magnetic recording medium.
    Type: Application
    Filed: October 28, 2011
    Publication date: May 2, 2013
    Applicant: Solar Applied Materials Technology Corp
    Inventors: Shang-Hsien Rou, Tien-Chieh Wu, Shang-Chieh Hou, Yung-Chun Hseuh
  • Publication number: 20130071695
    Abstract: Magnetic layers are described that include the use of magnetic grains and non-magnetic grain boundaries with hybrid additives. Hybrid additives include the use of at least two different additives in the composition of the grain boundaries of a magnetic layer in magnetic recording media. The use of hybrid additives in the grain boundaries results in improved recording media. Methods for forming magnetic layers and magnetic recording media with the hybrid additive grain boundaries are also described.
    Type: Application
    Filed: September 14, 2012
    Publication date: March 21, 2013
    Applicant: SEAGATE TECHNOLOGY LLC
    Inventors: Yingguo Peng, Ganping Ju
  • Publication number: 20130052485
    Abstract: A perpendicular magnetic recording stack with a dual continuous layer and a method of manufacturing the same. The perpendicular magnetic recording stack includes a substrate, one or more magnetic granular recording layers, and a dual continuous layer having first and second continuous layers. The first continuous layer, disposed between the second continuous layer and the magnetic granular recording layers, has an intermediate lateral exchange coupling, which is higher than the lateral exchange coupling of the magnetic granular layers. The second continuous layer has a higher lateral exchange coupling than the first continuous layer.
    Type: Application
    Filed: August 25, 2011
    Publication date: February 28, 2013
    Applicant: SEAGATE TECHNOLOGY LLC
    Inventors: Zhong Wu, Li Tang, Shoutao Wang, Abebe Hailu
  • Patent number: 8361640
    Abstract: Embodiments of the present invention provide recording area separated magnetic recording media (DTMs, BPMs) allowing magnetic heads to fly lower. According to one embodiment, the recording area separated magnetic recording media are configured so that magnetic recording layers have parts with the relatively higher element ratio of a ferromagnetic material, and parts with the lower element ratio of the ferromagnetic material, occurring periodically in the in-plane direction, and the average height from the substrate surface of the parts with the relatively higher element ratio of a ferromagnetic material is higher than the average height from the substrate surface of the parts with the lower element ratio of the ferromagnetic material.
    Type: Grant
    Filed: February 20, 2009
    Date of Patent: January 29, 2013
    Assignee: HGST Netherlands B.V.
    Inventors: Toshinori Ono, Hiroshi Kanai, Tatsuysa Hinoue, Hiroyuki Suzuki, Hiroshi Inaba
  • Patent number: 8313848
    Abstract: A perpendicular magnetic recording medium having a substrate, a Cr-doped Fe-alloy-containing underlayer containing about 8 to 18 at % Cr and a perpendicular recording magnetic layer, and a process for improving corrosion resistance of the recording medium and for manufacturing the recording medium are disclosed.
    Type: Grant
    Filed: August 15, 2011
    Date of Patent: November 20, 2012
    Assignee: Seagate Technology LLC
    Inventors: Raj Nagappan Thangaraj, Mariana Rodica Munteanu, Erol Girt, Michael J. Stirniman, Thomas Patrick Nolan
  • Publication number: 20120251847
    Abstract: There are provided magnetic storage elements capable of performing a high-reliability write operation by inhibiting erroneous reversal of data of the magnetic storage element put in a semi-selected state, and a magnetic storage device using this. A recording layer having an easy axis and a hard axis overlaps at least one of a first or second conductive layer at the entire region thereof in plan view. First endpoints of a first line segment along the easy axis and maximum in dimension overlapping the recording layer in plan view don't overlap the second conductive layer in plan view. At least one of second endpoints of a pair of endpoints of a second line segment passing through the middle point of the first line segment, orthogonal to the first line segment in plan view, and overlapping the recording layer in plan view doesn't overlap the first conductive layer in plan view.
    Type: Application
    Filed: February 15, 2012
    Publication date: October 4, 2012
    Inventors: Takashi TAKENAGA, Takeharu KUROIWA, Taisuke FURUKAWA