Patents by Inventor Koichi Wago

Koichi Wago has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Publication number: 20140370331
    Abstract: The embodiments disclose a continuous thin film magnetic layer and a patterned hard mask layer configured to be deposited onto the continuous thin film magnetic layer and to have plural ion implantations, wherein the ion implantations are configured to create chemically and structurally altered localized magnetic regions unprotected by the patterned hard mask layer.
    Type: Application
    Filed: January 17, 2014
    Publication date: December 18, 2014
    Applicant: Seagate Technology LLC
    Inventors: Sunnie H. N. Lim, Koichi Wago
  • Patent number: 8900655
    Abstract: A method of fabricating a patterned perpendicular magnetic recording medium comprises steps of: (a) providing a layer stack including a magnetically soft underlayer (“SUL”) and an overlying non-magnetic interlayer; (b) forming a masking layer on the non-magnetic interlayer; (c) forming a resist layer on the masking layer; (d) forming a pattern of recesses extending through the resist layer and exposing spaced apart surface portions of the masking layer; (e) extending the pattern of recesses through the masking layer to expose spaced apart surface portions of the interlayer; and (f) at least partially filling the pattern of recesses with a magnetically hard material to form a perpendicular magnetic recording layer.
    Type: Grant
    Filed: October 4, 2006
    Date of Patent: December 2, 2014
    Assignee: Seagate Technology LLC
    Inventors: Bing K. Yen, David S. Kuo, Dieter K. Weller, Kim Y. Lee, Koichi Wago
  • Publication number: 20140308439
    Abstract: The embodiments disclose a method of protecting patterned magnetic materials of a stack, including depositing a thin continuous film of an inert material that is inert to the magnetic materials of a patterned stack upon which the thin continuous film is being deposited and forming a thin interim interface layer from the thin continuous film to protect top and sidewall areas of non-etched higher relief magnetic islands and magnetic film etched surfaces of the patterned stack from air exposure damage and damage from contact with backfilled materials.
    Type: Application
    Filed: June 25, 2014
    Publication date: October 16, 2014
    Inventors: Zhaohui Fan, Yuan Xu, Justin Jia-Jen Hwu, Koichi Wago, David Shiao-Min Kuo
  • Publication number: 20140193538
    Abstract: Provided herein is an apparatus, including an imprint template including a dual-imprint pattern, wherein the dual-imprint pattern is characteristic of imprinting a first pattern on the template with a first template and a second pattern on the template with a second template, and wherein the first pattern and the second pattern at least partially overlap to form the dual-imprint pattern.
    Type: Application
    Filed: January 21, 2014
    Publication date: July 10, 2014
    Applicant: SEAGATE TECHNOLOGY LLC
    Inventors: Kim Y. Lee, Bing K. Yen, David S. Kuo, Koichi Wago, Shih-fu Lee, Dieter K. Weller
  • Patent number: 8771529
    Abstract: A method of imprint lithography includes imprinting a first pattern with a first template on a first substrate of a lithographic template. A second pattern is imprinted with a second template on the substrate of the lithographic template. The first pattern and the second pattern at least partially overlap, thus forming a third pattern. The third pattern is lithographically formed on a second substrate with the lithographic template. In an embodiment, the first pattern is a concentric line pattern formed by thin film deposition. In an embodiment, the second pattern is a radial line pattern. In an embodiment the first pattern and the second pattern may have line frequency increased.
    Type: Grant
    Filed: September 30, 2010
    Date of Patent: July 8, 2014
    Assignee: Seagate Technology LLC
    Inventors: Kim Yang Lee, Bing Yen, David Kuo, Koichi Wago, Shih-Fu Lee, Dieter Weller
  • Publication number: 20140175051
    Abstract: The embodiments disclose a method of creating a mask by depositing a protection layer that mechanically strengthens patterned features that are imprinted into a resist layer that is deposited onto a magnetic layer, implanting mechanically strengthened patterned resist layer features into the magnetic layer using ion implantation and removing the resist layer and the mask to expose at least a portion of the magnetic layer.
    Type: Application
    Filed: March 12, 2013
    Publication date: June 26, 2014
    Inventors: Michael Feldbaum, Koichi Wago, David Kuo
  • Patent number: 8719616
    Abstract: A method for encoder frequency-shift compensation includes determining frequency values of an input encoder signal, determining repeatable frequency-shifts of the frequency values and generating a frequency-shift compensated clock using the repeatable frequency-shifts. A frequency-shift compensated clock includes a synthesizer configured to generate a frequency-shift compensated clock signal using repeatable frequency shifts and encoder clock signals.
    Type: Grant
    Filed: February 22, 2013
    Date of Patent: May 6, 2014
    Assignee: Seagate Technology LLC
    Inventors: Koichi Wago, Sundeep Chauhan, David M. Tung
  • Patent number: 8416648
    Abstract: Producing a servo pattern on a media involves rotating a master, and during a first revolution of the master, forming a first transition at a first radial position on the master, and forming a first transition at a second radial position. During a second revolution of the master, a second transition at the first radial position is formed, and a second transition at the second radial position is formed. By exposing individual servo burst transitions located at the first and second radial positions, in separate disk revolutions, only one of the magnetic transitions will inherit a particular deflection from a nominal radial position. If there are any mechanical disturbances, each magnetic transition will be randomly displaced from its nominal position, reducing the written-in run-out by ?n, where n is the number of magnetic transitions in a particular servo burst.
    Type: Grant
    Filed: August 31, 2010
    Date of Patent: April 9, 2013
    Assignee: Seagate Technology LLC
    Inventors: Gabor Szita, Koichi Wago, Neil Deeman
  • Publication number: 20130070370
    Abstract: A planarization process may planarize a media disk that has data trenches between data features and larger servo trenches between servo features. A filler material layer is deposited on the media disk and provides step coverage of the trenches. The filler material has data recesses over the data trenches and servo recesses over the servo trenches that must be removed to produce a planar media surface. A first planarization process is used to remove the data recesses and a second planarization process is used to remove the servo recesses.
    Type: Application
    Filed: September 14, 2012
    Publication date: March 21, 2013
    Applicant: SEAGATE TECHNOLOGY LLC
    Inventors: Yuan Xu, Wei Hu, Justin Jia-Jen Hwu, Gene Gauzner, Koichi Wago, David Shiao-Min Kuo
  • Patent number: 8402303
    Abstract: The embodiments disclose a method for encoder frequency-shift compensation, including, determining frequency values of an input encoder signal, analyzing an encoder index clock signal and the input encoder signal to determine values of frequency-shifts and compensating for the values of the frequency-shifts to generate a frequency-shift compensated clock.
    Type: Grant
    Filed: April 29, 2011
    Date of Patent: March 19, 2013
    Assignee: Seagate Technology LLC
    Inventors: Koichi Wago, Sundeep Chauhan, David M. Tung
  • Patent number: 8367228
    Abstract: A method for manufacturing a magnetic recording medium for perpendicular magnetic recording includes the steps of forming a first magnetic layer which has magnetic crystal grains exhibiting perpendicular magnetic anisotropy and nonmagnetic substances for magnetically separating the magnetic crystal grains from each other at grain boundaries of the magnetic crystal grains, forming a second magnetic layer which has magnetic grains exchange-coupled to the magnetic crystal grains, a grain boundary width of the magnetic grains being smaller than a grain boundary width of the magnetic crystal grains, and forming separation regions which magnetically separate tracks from each other in regions between the tracks of the magnetic recording medium in at least the second magnetic layer. The separation regions are disposed substantially only in the second magnetic layer of the first magnetic layer and the second magnetic layer.
    Type: Grant
    Filed: October 18, 2010
    Date of Patent: February 5, 2013
    Assignee: WD Media (Singapore) PTE. Ltd.
    Inventors: Yoshiaki Sonobe, Teiichiro Umezawa, Koichi Wago
  • Publication number: 20130004736
    Abstract: The embodiments disclose a method of protecting patterned magnetic materials of a stack, including depositing a thin continuous film of an inert material that is inert to the magnetic materials of a patterned stack upon which the thin continuous film is being deposited and forming a thin interim interface layer from the thin continuous film to protect top and sidewall areas of non-etched higher relief magnetic islands and magnetic film etched surfaces of the patterned stack from air exposure damage and damage from contact with backfilled materials.
    Type: Application
    Filed: June 30, 2011
    Publication date: January 3, 2013
    Applicant: SEAGATE TECHNOLOGY, LLC
    Inventors: Zhaohui Fan, Yuan Xu, Justin Jia-Jen Hwu, Koichi Wago, David Shiao-Min Kuo
  • Patent number: 8308964
    Abstract: A planarization process may planarize a media disk that has data trenches between data features and larger servo trenches between servo features. A filler material layer is deposited on the media disk and provides step coverage of the trenches. The filler material has data recesses over the data trenches and servo recesses over the servo trenches that must be removed to produce a planar media surface. A first planarization process is used to remove the data recesses and a second planarization process is used to remove the servo recesses.
    Type: Grant
    Filed: September 30, 2010
    Date of Patent: November 13, 2012
    Assignee: Seagate Technology LLC
    Inventors: Yuan Xu, Wei Hu, Justin Jia-Jen Hwu, Gene Gauzner, Koichi Wago, David Shiao-Min Kuo
  • Publication number: 20120274371
    Abstract: The embodiments disclose a method for encoder frequency-shift compensation, including, determining frequency values of an input encoder signal, analyzing an encoder index clock signal and the input encoder signal to determine values of frequency-shifts and compensating for the values of the frequency-shifts to generate a frequency-shift compensated clock.
    Type: Application
    Filed: April 29, 2011
    Publication date: November 1, 2012
    Applicant: SEAGATE TECHNOLOGY, LLC
    Inventors: Koichi Wago, Sundeep Chauhan, David M. Tung
  • Publication number: 20120196094
    Abstract: A method for nano-patterning includes imprinting features in a resist with an imprint mold to form one or more topographic surface patterns on the imprinted resist. A a block copolymer (“BCP”) material is deposited on the imprinted resist, wherein a molecular dimension L0 of the BCP material correlates by an integer multiple to a spacing dimension of the one or more topographic surface patterns on the imprinted resist. The deposited BCP is annealed and at least a portion of the annealed BCP is removed, forming a template having discrete domains.
    Type: Application
    Filed: January 31, 2011
    Publication date: August 2, 2012
    Applicant: SEAGATE TECHNOLOGY LLC
    Inventors: Yuan Xu, Kim Lee, Wei Hu, Koichi Wago, David Shiao-Min Kuo
  • Publication number: 20120080402
    Abstract: A planarization process may planarize a media disk that has data trenches between data features and larger servo trenches between servo features. A filler material layer is deposited on the media disk and provides step coverage of the trenches. The filler material has data recesses over the data trenches and servo recesses over the servo trenches that must be removed to produce a planar media surface. A first planarization process is used to remove the data recesses and a second planarization process is used to remove the servo recesses.
    Type: Application
    Filed: September 30, 2010
    Publication date: April 5, 2012
    Applicant: Seagate Technology LLC
    Inventors: Yuan Xu, Wei Hu, Justin Jia-Jen Hwu, Gene Gauzner, Koichi Wago, David Shiao-Min Kuo
  • Publication number: 20120049407
    Abstract: Producing a servo pattern on a media involves rotating a master, and during a first revolution of the master, forming a first transition at a first radial position on the master, and forming a first transition at a second radial position. During a second revolution of the master, a second transition at the first radial position is formed, and a second transition at the second radial position is formed. By exposing individual servo burst transitions located at the first and second radial positions, in separate disk revolutions, only one of the magnetic transitions will inherit a particular deflection from a nominal radial position. If there are any mechanical disturbances, each magnetic transition will be randomly displaced from its nominal position, reducing the written-in run-out by ?n, where n is the number of magnetic transitions in a particular servo burst.
    Type: Application
    Filed: August 31, 2010
    Publication date: March 1, 2012
    Inventors: Gabor Szita, Koichi Wago, Neil Deeman
  • Patent number: 8076013
    Abstract: A magnetic recording medium (10) has a substrate (12) and a perpendicular magnetic recording layer (30) formed over the substrate (12). The perpendicular magnetic recording layer (30) has a granular layer (20) in which a magnetic signal is recorded and a continuous film layer (24) magnetically coupled to the granular layer (20). The continuous film layer (24) has hard magnetic portions (204) formed in positions corresponding to the recording regions where magnetic signals are recorded in the granular layer (20) and magnetic shield portions (202) formed between the hard magnetic portions (204), each having a magnetization curve whose slope is larger than those of the hard magnetic portions in the region where the applied magnetic filed is zero when the magnetization curve is measured, and each having a residual magnetic polarization smaller than those in the hard magnetic portions.
    Type: Grant
    Filed: February 13, 2008
    Date of Patent: December 13, 2011
    Assignee: WD Media (Singapore) Pte. Ltd.
    Inventors: Yoshiaki Sonobe, Takahiro Onoue, Koichi Wago
  • Publication number: 20110044147
    Abstract: A method of performing writable optical recording of a medium to form multilevel oriented nano-structures therein, comprises steps of providing a disc-shaped, writable recording medium having a planar surface; and encoding data/information in the medium by forming a plurality of multilevel nano-structured pits in the surface by scanning with a focused spot of optical energy to form at least one data track therein, including scanning the optical spot in a cross-track direction while rotating the disc about a central axis.
    Type: Application
    Filed: November 2, 2010
    Publication date: February 24, 2011
    Applicant: SEAGATE TECHNOLOGY LLC
    Inventors: Duane C. Karns, Dieter K. Weller, William A. Challener, Edward Gage, David S. Kuo, Neil Deeman, Shih-Fu Lee, Koichi Wago
  • Publication number: 20110039125
    Abstract: A method for manufacturing a magnetic recording medium for perpendicular magnetic recording includes the steps of forming a first magnetic layer which has magnetic crystal grains exhibiting perpendicular magnetic anisotropy and nonmagnetic substances for magnetically separating the magnetic crystal grains from each other at grain boundaries of the magnetic crystal grains, forming a second magnetic layer which has magnetic grains exchange-coupled to the magnetic crystal grains, a grain boundary width of the magnetic grains being smaller than a grain boundary width of the magnetic crystal grains, and forming separation regions which magnetically separate tracks from each other in regions between the tracks of the magnetic recording medium in at least the second magnetic layer. The separation regions are disposed substantially only in the second magnetic layer of the first magnetic layer and the second magnetic layer.
    Type: Application
    Filed: October 18, 2010
    Publication date: February 17, 2011
    Applicant: WD MEDIA (SINGAPORE) PTE. LTD.
    Inventors: YOSHIAKI SONOBE, TEIICHIRO UMEZAWA, KOICHI WAGO