Patents Examined by Holly Rickman
  • Fluoropolyether compound, lubricant and magnetic disk each containing the same
    Patent number: 8734966
    Abstract: A compound of the formula (1), lubricant containing the compound and magnetic disk R1—C6H4O—CH2CH(OH)CH2OCH2—R2—CH2—O—R3??(1) wherein R1 is hydrogen, alkoxyl having 1 to 4 carbon atoms, amino or amido, R2 is —CF2O(CF2CF2O)x(CF2O)yCF2—, —CF2CF2O(CF2CF2CF2O)z—CF2CF2— or —CF2CF2CF2O(CF2CF2CF2CF2O)nCF2CF2CF2—, x and y are each an integer of 0 to 15, z is an integer of 1 to 15, n is an integer of 0 to 4, R3 is —CH2CH(OH)CH2OH, —CH2CH(OH)CH2OCH2CH(OH)CH2OH or —(CH2)mOH, m is an integer of 2 to 6.
    Type: Grant
    Filed: February 13, 2013
    Date of Patent: May 27, 2014
    Assignee: Moresco Corporation
    Inventors: Ryosuke Sagata, Tsuyoshi Shimizu, Tomomi Hatta, Nagayoshi Kobayashi
  • Lubricant with non-terminal functional groups
    Patent number: 8722213
    Abstract: Lubricant with non-terminal functional groups. The location of the functional groups minimizes free chain length and molecular weight of a lubricant while simultaneously maximizing evaporation temperature. The locations of the functional groups to the backbone of the molecule of the lubricant allows for shorter lengths of free backbone length between functional groups attached to a lubricated surface. The lubricant lubricates mechanical devices including hard disk drives. The lubricant can also be added to media or other mechanical parts in conjunction with other lubricants.
    Type: Grant
    Filed: June 5, 2013
    Date of Patent: May 13, 2014
    Assignee: HGST Netherlands B.V.
    Inventors: Xing-Cai Guo, Bruno Marchon, Robert Waltman, Run-Han Wang
  • Hybrid grain boundary additives in granular media
    Patent number: 8722214
    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: Grant
    Filed: September 14, 2012
    Date of Patent: May 13, 2014
    Assignee: Seagate Technology LLC
    Inventors: Yingguo Peng, Ganping Ju
  • Magnetic head and magnetic disk apparatus
    Patent number: 8717708
    Abstract: Embodiments of the present invention provide a magnetic head for perpendicular magnetic recording, and a magnetic disk apparatus capable of preventing data erasure caused by alignment marks. In an embodiment, the magnetic head includes a head element including at least a main pole having a pole face on a flying surface and an auxiliary pole; alignment marks made of a magnetic material and used to detect the amount of lapping work when lapping the pole face of the main pole; and members made of a magnetic material, continuously extending in either direction with respect to the position of the main pole from within the alignment marks outward at least beyond the alignment marks.
    Type: Grant
    Filed: December 3, 2008
    Date of Patent: May 6, 2014
    Assignee: HGST Netherlands B.V.
    Inventors: Mao Nishiyama, Shuji Nishida, Hideaki Maeda, Masafumi Mochizuki
  • Low-coupling oxide media (LCOM)
    Patent number: 8709619
    Abstract: A low-coupling perpendicular magnetic recording media comprising a magnetic storage layer and at least one low saturation magnetization layer. The magnetic storage layer has a saturation magnetization between about 400-900 emu/cm3 and the at least one low saturation magnetization layer has a saturation magnetization below that of the magnetic storage layer.
    Type: Grant
    Filed: August 31, 2012
    Date of Patent: April 29, 2014
    Assignee: Seagate Technology LLC
    Inventors: Erol Girt, Hans Jurgen Richter, Mariana R. Munteanu, Thomas Nolan
  • Magnetic recording medium, information storage device, and method of manufacturing magnetic recording medium
    Patent number: 8709620
    Abstract: A magnetic recording medium includes a magnetic recording layer. The magnetic recording layer includes a first magnetic layer formed as a pattern portion that is a data portion in a servo region, a second magnetic layer formed as a non-pattern portion that is magnetized to be antiparallel with a magnetization direction of the first magnetic layer and of which coercive force is lower than a coercive force of the first magnetic layer, and a nonmagnetic layer formed between the first magnetic layer and the second magnetic layer.
    Type: Grant
    Filed: April 20, 2010
    Date of Patent: April 29, 2014
    Assignee: Showa Denko K.K.
    Inventor: Yuuki Yoshida
  • Magnetic storage apparatus
    Patent number: 8709618
    Abstract: According to embodiments of the present invention, a shielded pole writer and a perpendicular magnetic recording medium suitable thereto are combined to provide high medium SNR and excellent OW characteristic simultaneously. A perpendicular magnetic recording medium of a magnetic storage apparatus mounting a shielded pole writer, including a perpendicular magnetic recording medium having a recording layer of a three layered structure is used. A first recording layer has a granular structure consisting of grain boundaries containing an oxide and columnar grains comprising a CoCrPt alloy, in which a second recording layer and a third recording layer formed thereabove comprise Co as a main ingredient, contain Cr and do not contain an oxide, and the Cr concentration in the second recording layer is lower than the Cr concentration in the third recording layer.
    Type: Grant
    Filed: March 20, 2007
    Date of Patent: April 29, 2014
    Assignee: HGST Netherlands B.V.
    Inventors: Ikuko Takekuma, Hiroyuki Nakagawa, Hiroaki Nemoto, Yoshiyuki Hirayama
  • Perpendicular magnetic recording medium and magnetic storage apparatus using the same
    Patent number: 8703307
    Abstract: According to one embodiment, a perpendicular magnetic recording medium includes a soft magnetic underlayer formed above a substrate, a lower seed layer formed above the soft magnetic underlayer, at least one upper seed layer formed above the lower seed layer, an interlayer formed above the at least one upper seed layer, a perpendicular recording layer formed above the interlayer, and a protective layer formed above the perpendicular recording layer, wherein the at least one upper seed layer comprises Ni or a Ni based alloy including N, and wherein the lower seed layer includes Ni and at least one element selected from a group consisting of: W and Cr. Other embodiments are described herein regarding perpendicular magnetic recording systems and methods of producing perpendicular magnetic media.
    Type: Grant
    Filed: October 12, 2010
    Date of Patent: April 22, 2014
    Assignee: HGST Netherlands B.V.
    Inventors: Akemi Hirotsune, Yotsuo Yahisa, Ichiro Tamai
  • Method and manufacture process for exchange decoupled first magnetic layer
    Patent number: 8697260
    Abstract: A perpendicular magnetic recording medium having a dual-layer magnetic film is disclosed. The bottom layer is completely exchange decoupled, and the top layer contains a certain amount of exchange coupling optimized for recording performance. Preferably, the bottom magnetic layer contains stable oxide material (for example, TiO2) and other non-magnetic elements (for example, Cr). A method of manufacturing the media is also disclosed.
    Type: Grant
    Filed: July 25, 2008
    Date of Patent: April 15, 2014
    Assignee: Seagate Technology LLC
    Inventors: Zhong Stella Wu, Samuel Dacke Harkness, IV, Mariana R. Munteanu, Qixu Chen, Connie Chunling Liu
  • Lubricant for magnetic disc, magnetic disc and method of producing the same
    Patent number: 8697262
    Abstract: A magnetic disk in which at least a magnetic layer, a protective layer, and the lubrication layer are sequentially provided on a substrate, the lubrication layer contains a lubricant compound for a magnetic disk, having a perfluoropolyether main chain in the molecular structure and a structure indicated as follows at a position close to the center of the molecule: -0-CH2—CH(OH)—CH2—CH2—CH(OH)—CH2-0- or -0-CH2—CH(OH)—CH(OH)—CH2-0-.
    Type: Grant
    Filed: June 22, 2011
    Date of Patent: April 15, 2014
    Assignee: WD Media (Singapore) Pte. Ltd.
    Inventors: Katsushi Hamakubo, Kae Itoh, Koichi Shimokawa
  • Seed layer comprising FCC structure
    Patent number: 8696874
    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: Grant
    Filed: February 7, 2012
    Date of Patent: April 15, 2014
    Assignee: Seagate Technology LLC
    Inventors: Shoutao Wang, Weilu Xu, Chunghee Chang, Xiaoguang Ma, Mark Johnson, Abebe Hailu, Charles Chen
  • Perpendicular magnetic recording medium
    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
  • Perpendicular magnetic recording medium
    Patent number: 8691402
    Abstract: A perpendicular magnetic recording medium according to which both the thermal stability of the magnetization is good and writing with a magnetic head is easy, and moreover the SNR is improved. In the case of a perpendicular magnetic recording medium comprising a nonmagnetic substrate (1), and at least a nonmagnetic underlayer (2), a magnetic recording layer (3), and a protective layer (4) formed in this order on the nonmagnetic substrate (1), the magnetic recording layer (3) comprises a low Ku region (31) layer having a perpendicular magnetic anisotropy constant (Ku value) of not more than 1×105 erg/cm3, and a high Ku region (32) layer having a Ku value of at least 1×106 erg/cm3. Moreover, the magnetic recording layer (3) is made to have therein nonmagnetic grain boundaries that contain a nonmagnetic oxide and magnetically isolate crystal grains, which are made of a ferromagnetic metal, from one another.
    Type: Grant
    Filed: November 2, 2012
    Date of Patent: April 8, 2014
    Assignees: Fuji Electric Co., Ltd., National University Corporation Tohoku University
    Inventors: Osamu Kitakami, Yutaka Shimada, Satoshi Okamoto, Takehito Shimatsu, Hajime Aoi, Hiroaki Muraoka, Yoshihisa Nakamura, Hiroyuki Uwazumi, Tadaaki Oikawa
  • Lubricant compositions
    Patent number: 8685548
    Abstract: Compositions including one or more a central cores having a cyclic group, and a plurality of arms extending from the central cores, wherein the arms comprise perfluoropolyethers (PFPEs) or its derivatives. Methods of preparing the compositions are also provided. Methods of preparing storage media that incorporate the compositions therein are further provided.
    Type: Grant
    Filed: March 31, 2011
    Date of Patent: April 1, 2014
    Assignee: Seagate Technology LLC
    Inventors: Xiaoping Yan, Michael Joseph Stirniman, Jiping Yang, Wenhong Liu, Qian Guo
  • Recording device
    Patent number: 8685546
    Abstract: Provided is a recording medium suitable for use in magnetic transfer of a servo pattern onto a magnetic recording medium. The recording medium includes a substrate including a plurality of servo regions and a plurality of data regions, and a magnetic layer formed on each of the servo regions and patterned in the shape of a servo pattern to be patterned on a magnetic recording medium, wherein the servo regions protrude relative to the data regions.
    Type: Grant
    Filed: May 27, 2009
    Date of Patent: April 1, 2014
    Assignee: Seagate Technology LLC
    Inventors: Kyoung-won Na, Myung-bok Lee, Sang-chul Sul, Jin-seung Sohn
  • Lubricant and magnetic disk
    Patent number: 8679655
    Abstract: A lubricant containing a compound (A) comprising a perfluoropolyether having a main-chain structure of the formula (1) and having a polar group at each of opposite terminals thereof, and a compound (B) comprising a perfluoropolyether having a main-chain structure of the formula (1) and having a nonpolar group at least one terminal thereof —(CF2CF2CF2O)a-??(1) wherein a is a real number of 5 to 30.
    Type: Grant
    Filed: November 18, 2008
    Date of Patent: March 25, 2014
    Assignee: Moresco Corporation
    Inventor: Nagayoshi Kobayashi
  • Lubricant and magnetic disk
    Patent number: 8679656
    Abstract: A lubricant containing a compound of the formula (I) wherein n is substantially 2, 3 or 4, R is C1-4 fluoroalkyl and Rf is —CF2O(CF2CF2O)x(CF2O)yCF2— or —CF2CF2O(CF2CF2CF2O)zCF2CF2— in which x, y and z are each 0 or a positive real number to give a number average molecular weight of 500 to 2000 to a fluoropolyether of the formula HOCH2—Rf—CH2OH including said Rf, the fluoropolyether having a molecular weight distribution (PD, weight average molecular weight/number average molecular weight) of 1.0 to 1.5.
    Type: Grant
    Filed: September 3, 2009
    Date of Patent: March 25, 2014
    Assignee: Moresco Corporation
    Inventors: Nagayoshi Kobayashi, Tsuyoshi Shimizu
  • Low-coupling oxide media (LCOM)
    Patent number: 8673464
    Abstract: A low-coupling perpendicular magnetic recording media comprising a magnetic storage layer and at least one low saturation magnetization layer. The magnetic storage layer has a saturation magnetization between about 400-900 emu/cm3 and the at least one low saturation magnetization layer has a saturation magnetization below that of the magnetic storage layer.
    Type: Grant
    Filed: August 31, 2012
    Date of Patent: March 18, 2014
    Assignee: Seagate Technology LLC
    Inventors: Erol Girt, Hans Jurgen Richter, Mariana R. Munteanu, Thomas Nolan
  • Method to synthesize ordered magnetic alloys at low temperature
    Patent number: 8673463
    Abstract: The present invention relates to a method of synthesizing an ordered magnetic alloy comprising obtaining a substrate and performing sequential sputter deposition of multiple atomic monolayers of the magnetic alloy.
    Type: Grant
    Filed: September 2, 2008
    Date of Patent: March 18, 2014
    Assignee: Seagate Technology LLC
    Inventor: Samuel Dacke Harkness, IV
  • CoPtCr-based bit patterned magnetic media
    Patent number: 8673466
    Abstract: A bit patterned magnetic recording medium comprises a substrate having a surface, and a plurality of spaced apart magnetic elements on the surface, each element constituting a discrete magnetic domain or bit of the same structure and comprised of a stack of thin film layers including in order from the substrate surface: a seed layer; and a perpendicular magnetic recording layer in contact with a surface of the seed layer and comprising a Co 1-x-yPtxCry alloy material, where 0.05?x?0.35 and 0?y?0.15. The Co1-x-yPtxCry alloy material has a first order magnetic anisotropy constant K1 up to about 2×107 erg/cm3, a saturation magnetization Ms up to about 1200 emu/cm3, an anisotropy field HK=2K1/Ms up to about 35 kOe, a hexagonal (0001) crystal structure with c-axis perpendicular to a surface thereof, and an X-Ray diffraction (XRD) rocking curve with a full width at half maximum (FWHM) of ˜5° or less.
    Type: Grant
    Filed: September 25, 2006
    Date of Patent: March 18, 2014
    Assignee: Seagate Technology LLC
    Inventors: Dieter K. Weller, Hans J. Richter, Samuel D. Harkness, IV, Erol Girt