Patents Examined by Holly Rickman
  • Magnetic recording medium and method of manufacturing the same
    Patent number: 9401171
    Abstract: An aspect of the present invention relates to a magnetic recording medium, which comprises a nonmagnetic layer containing a nonmagnetic powder and a binder and a magnetic layer containing a ferromagnetic powder and a binder in this order on a nonmagnetic support, wherein the nonmagnetic layer has a thickness of equal to or less than 300 nm; a composite elastic modulus as measured on a surface of the magnetic layer ranges from 6.0 to 8.0 GPa; the magnetic layer comprises an abrasive with a specific surface area by BET method ranging from 14 m2/g to 40 m2/g; and a surface abrasive occupancy on a surface of the magnetic layer ranges from 0.2% to 2%.
    Type: Grant
    Filed: March 15, 2013
    Date of Patent: July 26, 2016
    Assignee: FUJIFILM Corporation
    Inventors: Norihito Kasada, Masahide Sato, Isamu Watanabe
  • Lubricants providing magnetic head wear reduction and magnetic spacing improvement
    Patent number: 9384771
    Abstract: A lubricant according to one embodiment includes a cyclophosphazene according to chemical formula 1,
    Type: Grant
    Filed: December 20, 2013
    Date of Patent: July 5, 2016
    Assignee: HGST Netherlands B.V.
    Inventors: Hiroyuki Matsumoto, Yoshihiko Ooeda, Sukefumi Ito, Yoko Saito
  • Magnetic stack including TiN-X intermediate layer
    Patent number: 9368142
    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: Grant
    Filed: September 24, 2013
    Date of Patent: June 14, 2016
    Assignee: SEAGATE TECHNOLOGY LLC
    Inventors: Jingsheng Chen, Huihui Li, Ganping Ju, Yingguo Peng
  • Grain oriented electrical steel sheet and method for manufacturing the same
    Patent number: 9330839
    Abstract: A grain oriented electrical steel sheet is subjected to magnetic domain refining treatment by electron beam irradiation and exhibits excellent low-noise properties when assembled as an actual transformer, in which a ratio (Wa/Wb) of a film thickness (Wa) of the forsierite film on a strain-introduced side of the steel sheet to a film thickness (Wb) of the forsierite film on a non-strain-introduced side of the steel sheet is 0.5 or higher, a magnetic domain discontinuous portion in a surface of the steel sheet on the strain-introduced side has an average width of 150 to 300 ?m, and a magnetic domain discontinuous portion in a surface of the steel sheet on the non-strain-introduced side has an average width of 250 to 500 ?m.
    Type: Grant
    Filed: August 3, 2011
    Date of Patent: May 3, 2016
    Assignee: JFE Steel Corporation
    Inventors: Takeshi Omura, Hiroi Yamaguchi, Seiji Okabe
  • Recording medium
    Patent number: 9318141
    Abstract: A recording medium includes a magnetic recording layer formed on a substrate; a protective layer formed on the magnetic recording layer and having a total thickness that is equal to or greater than 1 nm but equal to or less than 2 nm. The protective layer is composed of a silicon oxide layer formed on the magnetic recording layer and having a thickness of 0.3 nm or more; a silicon layer formed on the silicon oxide layer and having a thickness of 0.2 nm or more; and an amorphous carbon layer formed on the silicon layer and having a thickness of 0.2 nm or more, and having a hydrogen content equal to or greater than 25.6 at % but equal to or less than 43.3 at %. Thus, magnetic spacing between the magnetic recording layer and a magnetic head advantageously may be reduced while maintaining the thermal insulation characteristics.
    Type: Grant
    Filed: February 28, 2013
    Date of Patent: April 19, 2016
    Assignee: FUJI ELECTRIC CO., LTD.
    Inventor: Tomonori Katano
  • Iron powder coated with Mg-containing oxide film
    Patent number: 9269481
    Abstract: Oxide-coated Fe powder for producing various electromagnetic circuit components requiring high resistivity is provided. The oxide-coated Fe powder is a Mg-containing oxide film-coated iron powder coated with an Mg—Fe—O ternary-based deposition film at least containing (Mg, Fe)O. The (Mg,Fe)O is a crystalline MgO-dissolving wustite. The Mg—Fe—O ternary-based oxide deposition film has a sulfur-enriched layer containing a higher concentration of sulfur than that of central portion of the iron powder, fine crystalline texture having a grain size of 200 nm or less, and the outermost surface is substantially composed of MgO. A composite soft magnetic material using the Mg-containing oxide film-coated iron powder is also provided.
    Type: Grant
    Filed: November 2, 2005
    Date of Patent: February 23, 2016
    Assignee: DIAMET CORPORATION
    Inventors: Muneaki Watanabe, Ryoji Nakayama, Gakuji Uozumi
  • Heatsink for heat assisted magnetic recording media
    Patent number: 9263076
    Abstract: A magnetic stack includes a heatsink layer comprising (200) Cu or (200) CuX, a magnetic recording layer, and an interlayer disposed between the heatsink layer and the magnetic recording layer.
    Type: Grant
    Filed: March 7, 2013
    Date of Patent: February 16, 2016
    Assignee: Seagate Technology LLC
    Inventors: Yingguo Peng, Kai Chieh Chang, Yinfeng Ding, Ganping Ju, Yukiko Kubota, Timothy J. Klemmer, Jan-Ulrich Thiele, Qihong Wu, Xiaobin Zhu
  • Thermal retention structure for a data device
    Patent number: 9263077
    Abstract: A data device may have at least a magnetic lamination with a thermal retention structure deposited on a substrate and configured to maintain a predetermined temperature for a predetermined amount of time. Such predetermined temperature and amount of time may allow for the growth of a magnetic layer with a predetermined magnetic anisotropy.
    Type: Grant
    Filed: April 9, 2012
    Date of Patent: February 16, 2016
    Inventor: Yukiko Kubota
  • Patterned magnetic media with offset data and servo regions
    Patent number: 9251835
    Abstract: A patterned magnetic media having offset servo and data regions. The media can be constructed by a method that allows both a data region and a servo region to be patterned without the patterning of one region adversely affecting the patterning of the other region. The method results in a patterned data region a patterned servo region and intermediate regions between the servo and data regions. The intermediate regions, which are most likely, but not necessarily, asymmetrical with one another indicate that the method has been used to pattern the media.
    Type: Grant
    Filed: June 4, 2013
    Date of Patent: February 2, 2016
    Assignee: HGST Netherlands B.V.
    Inventors: Michael K. Grobis, Jeffrey S. Lille, Ricardo Ruiz
  • Hexagonal ferrite magnetic powder and magnetic recording medium
    Patent number: 9251832
    Abstract: An aspect of the present invention relates to hexagonal ferrite magnetic powder, which has an activation volume ranging from 900 nm3 to 1,600 nm3, and a ratio of a coefficient of plate thickness variation to a coefficient of particle diameter variation, coefficient of plate thickness variation/coefficient of particle diameter coefficient, ranging from 0.20 to 0.60.
    Type: Grant
    Filed: March 24, 2014
    Date of Patent: February 2, 2016
    Assignee: FUJIFILM Corporation
    Inventors: Hiroyuki Suzuki, Toshio Tada
  • Magnetic recording medium lubricant mixture and systems thereof
    Patent number: 9245565
    Abstract: In one embodiment, a magnetic recording medium includes a magnetic recording layer adapted to store magnetic information, a protective film positioned above the recording layer, the protective film being adapted to reduce wear to the magnetic recording layer, and a lubricant positioned above the protective film, the lubricant being adapted to provide a stable head-to-disk interface, wherein the lubricant includes a first lubricant, the first lubricant including a material having the following chemical formula: wherein Rf represents: and wherein Y is a repeating chain including carbon and fluorine.
    Type: Grant
    Filed: June 14, 2013
    Date of Patent: January 26, 2016
    Assignee: HGST Netherlands B.V.
    Inventors: Yoko Saito, Hiroyuki Matsumoto, Sukefumi Ito, Yoshihiko Ooeda
  • Magnetic recording medium and magnetic storage apparatus
    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
  • Magnetic disk and method of manufacturing the same
    Patent number: 9245568
    Abstract: Disclosed is a magnetic disk that has excellent durability, particularly excellent LUL durability, and excellent alumina resistance and has a high level of reliability under a low flying height of a magnetic head involved in a recent tendency toward a rapid increase in recording density and a very severe environment resistance requirement due to diversified applications. A magnetic disk (10) comprises a substrate (1) and at least a magnetic layer (6), a carbon-based protective layer (7), and a lubricating layer (8) provided in that order over the substrate (1). The lubricating layer (8) contains a compound that has a perfluoropolyether main chain in the structure thereof and has an aromatic group and a polar group at the end of the molecule.
    Type: Grant
    Filed: March 27, 2009
    Date of Patent: January 26, 2016
    Assignee: WD Media (Singapore) Pte. Ltd.
    Inventors: Kae Itoh, Katsushi Hamakubo
  • Template-based magnetic grain-nucleation sites on seed layer
    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
  • Perpendicular magnetic recording disc
    Patent number: 9240204
    Abstract: A perpendicular magnetic disk is provided. The disk includes, on a base and in the order from bottom, a first granular magnetic layer group including a plurality of magnetic layers each having a granular structure, a non-magnetic layer having Ru or a Ru alloy as a main component, a second granular magnetic layer group including a plurality of magnetic layers each having the granular structure, and an auxiliary recording layer having a CoCrPtRu alloy as a main component. Layers closer to a front surface among the plurality of magnetic layers included in the first granular magnetic layer group having an equal or smaller content of Pt. Layers closer to the front surface among the plurality of magnetic layers included in the second granular magnetic layer group having an equal or smaller content of Pt and having an equal or larger content of an oxide.
    Type: Grant
    Filed: May 20, 2011
    Date of Patent: January 19, 2016
    Assignee: WD Media (Singapore) Pte. Ltd.
    Inventors: Teiichiro Umezawa, Takenori Kajiwara, Tokichiro Sato
  • Perpendicular magnetic recording disk with template layer formed of nanoparticles embedded in a polymer material
    Patent number: 9236076
    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: Grant
    Filed: February 20, 2013
    Date of Patent: January 12, 2016
    Assignee: HGST Netherlands B.V.
    Inventors: Bruce Alvin Gurney, Ricardo Ruiz, Manfred Ernst Schabes, Kentaro Takano, Shi-Ling Chang Wang, Qing Zhu, Han Zou
  • Recording medium for heat-assisted-magnetic-recording (HAMR) and method for manufacturing the same
    Patent number: 9236078
    Abstract: According to embodiments of the present invention, a method for manufacturing a recording medium for heat-assisted-magnetic-recording (HAMR) is provided. The method includes forming an underlayer on a substrate, the underlayer including a precursor material, epitaxially depositing an interlayer on the underlayer, forming a recording layer over the interlayer, and converting the precursor material to a converted material having a thermal conductivity that is higher than a thermal conductivity of the recording layer. According to further embodiments of the present invention, another method for manufacturing a recording medium for heat-assisted-magnetic-recording (HAMR) and a recording medium for heat-assisted-magnetic-recording (HAMR) are also provided.
    Type: Grant
    Filed: October 10, 2013
    Date of Patent: January 12, 2016
    Assignee: Agency for Science Technology and Research
    Inventors: Jiangfeng Hu, Jianzhong Shi, Wai Lwin Phyoe, Tiejun Zhou, Kiat Min Cher
  • Perpendicular magnetic recording disk with template layer formed of a blend of nanoparticles
    Patent number: 9224412
    Abstract: A continuous-media perpendicular magnetic recording disk has a granular recording layer (RL) with controlled grain pitch distribution and controlled long range ordering of the grains. The disk includes a substrate with a template layer for the RL that comprises a blend of at least two different sized nanoparticles. The nanoparticles have a nanoparticle core with attached polymer ligands. The nanoparticle cores protrude above the surface of the template layer to provide a nonplanar surface topology. The blend of two sizes of nanoparticles causes the RL to have low grain pitch distribution and a disruption of long range ordering so that there are no large magnetic rafts. One of the nanoparticles types has a diameter greater than 105% of the diameter of the other nanoparticle type and is present in the total blend of nanoparticles of between about 5% and 35% or between about 55% and 90%.
    Type: Grant
    Filed: January 31, 2014
    Date of Patent: December 29, 2015
    Assignee: HGST Netherlands B.V.
    Inventors: Bruce Alvin Gurney, Ricardo Ruiz, Shi-Ling Chang Wang, Qing Zhu, Han Zou
  • Perpendicular magnetic recording medium and magnetic recording and reproducing apparatus
    Patent number: 9214177
    Abstract: According to one embodiment, provided is a perpendicular magnetic recording medium including an orientation control layer formed on a non-magnetic substrate, the orientation control layer consisting of a Ni alloy having fcc structure, non-magnetic buffer layer containing silver having fcc structure, non-magnetic seed layer consisting of Ag particles having fcc structure and amorphous Ge grain boundaries between the Ag particles, non-magnetic intermediate layer consisting of Ru or Ru alloy, and perpendicular magnetic recording layer, wherein the orientation control layer contacts the non-magnetic buffer layer, and the non-magnetic buffer layer contacts the non-magnetic seed layer.
    Type: Grant
    Filed: February 28, 2014
    Date of Patent: December 15, 2015
    Assignee: KABUSHIKI KAISHA TOSHIBA
    Inventor: Takeshi Iwasaki
  • Magnetic media with a low molecular weight lubricating layer for use in head/media contact detection
    Patent number: 9202503
    Abstract: According to various embodiments, a lubricating layer for providing lubrication to a magnetic recording medium includes a perfluoropolyether (PFPE) represented by: X—CF2CF2O(C3F6O)mCF2CF2—X, wherein m is in a range from 4 to 8 on average, and wherein X is This lubricating layer may be used in a magnetic disk, which includes a recording layer positioned above a nonmagnetic substrate, a protective film layer positioned above the recording layer, and the lubricating layer positioned above the protective film layer.
    Type: Grant
    Filed: January 15, 2013
    Date of Patent: December 1, 2015
    Assignee: HGST Netherlands B.V.
    Inventors: Yoshihiko Ooeda, Hiroyuki Matsumoto, Sukefumi Ito, Yoko Saito