Patents by Inventor Kyongha Kang

Kyongha Kang 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).

  • Patent number: 9990940
    Abstract: A data storage medium having a seed structure formed of a first seed layer comprising a nickel alloy NiY, where Y is an element selected from Al, B, Fe, Nb, W, and Co, and a second seed layer represented by NiWAX, where A is an element selected from Al, B, Fe, Nb, and Co, and X is either B, Si, Ti, Nb, V, Cr, Ru, or an oxide, with the second seed layer being disposed on the first seed layer; and a magnetic recording layer above the seed structure. In addition, a method for manufacturing a data storage medium containing the aforementioned seed structure is also disclosed.
    Type: Grant
    Filed: December 30, 2014
    Date of Patent: June 5, 2018
    Assignee: WD Media, LLC
    Inventors: Kyongha Kang, Daehoon Hong, Sy Vu, Chester C. H. Lo
  • Patent number: 9734857
    Abstract: A stack including a crystallographic orientation interlayer, a magnetic zero layer disposed on the interlayer, and a magnetic recording layer disposed on the magnetic zero layer is disclosed. The magnetic zero layer is non-magnetic or has a saturation magnetic flux density (Bs) less than about 100 emu/cc. The magnetic zero layer and the magnetic layer include grains surrounded by a non-magnetic segregant. The magnetic zero layer provides a coherent interface between the interlayer and the magnetic layer with a lattice mismatch less than about 4%.
    Type: Grant
    Filed: July 24, 2015
    Date of Patent: August 15, 2017
    Assignee: SEAGATE TECHNOLOGY LLC
    Inventors: Jai-Young Kim, Thomas P. Nolan, Kyongha Kang, Shoutao Wang, Vincent D. Nguyen, Abebe Hailu, Charles C. Chen
  • Publication number: 20170154647
    Abstract: One aspect of a perpendicular magnetic recording (PMR) media stack includes two intermediate layers, and a spacer layer formed between the two intermediate layers, wherein a surface energy of the spacer layer is lower than a surface energy of the two intermediate layers.
    Type: Application
    Filed: November 30, 2015
    Publication date: June 1, 2017
    Inventors: DAEHOON HONG, SY VU, KYONGHA KANG, MRUGESH DESAI
  • Publication number: 20150332721
    Abstract: A stack including a crystallographic orientation interlayer, a magnetic zero layer disposed on the interlayer, and a magnetic recording layer disposed on the magnetic zero layer is disclosed. The magnetic zero layer is non-magnetic or has a saturation magnetic flux density (Bs) less than about 100 emu/cc. The magnetic zero layer and the magnetic layer include grains surrounded by a non-magnetic segregant. The magnetic zero layer provides a coherent interface between the interlayer and the magnetic layer with a lattice mismatch less than about 4%.
    Type: Application
    Filed: July 24, 2015
    Publication date: November 19, 2015
    Inventors: Jai-Young Kim, Thomas P. Nolan, Kyongha Kang, Shoutao Wang, Vincent D. Nguyen, Abebe Hailu, Charles C. Chen
  • Patent number: 9190094
    Abstract: Aspects of the present invention relate to a perpendicular magnetic recording (PMR) media stack and methods for fabricating the same. The PMR media stack has a novel grain isolation initiation layer (GIIL) and/or a novel exchange-break layer (EBL) that can improve the signal-to-noise performance of the PMR media stack. The PMR media stack includes a substrate, a soft underlayer on the substrate, an interlayer positioned on the soft underlayer, and a grain isolation initiation layer (GIIL) positioned on the interlayer, a magnetic layer positioned on the GIIL, and an exchange break layer (EBL) positioned on the magnetic layer. The GIIL and/or EBL includes a CoCrRu-oxide.
    Type: Grant
    Filed: June 6, 2013
    Date of Patent: November 17, 2015
    Assignee: Western Digital (Fremont)
    Inventors: Daehoon Hong, Sy Vu, Kyongha Kang, B. Ramamurthy Acharya
  • Patent number: 9093101
    Abstract: A stack including a crystallographic orientation interlayer, a magnetic zero layer disposed on the interlayer, and a magnetic recording layer disposed on the magnetic zero layer is disclosed. The magnetic zero layer is non-magnetic or has a saturation magnetic flux density (Bs) less than about 100 emu/cc. The magnetic zero layer and the magnetic layer include grains surrounded by a non-magnetic segregant. The magnetic zero layer provides a coherent interface between the interlayer and the magnetic layer with a lattice mismatch less than about 4%.
    Type: Grant
    Filed: February 28, 2011
    Date of Patent: July 28, 2015
    Assignee: SEAGATE TECHNOLOGY LLC
    Inventors: Jai-Young Kim, Thomas P. Nolan, Kyongha Kang, Shoutao Wang, Vincent D. Nguyen, Abebe Hailu, Charles C. Chen
  • Patent number: 9028985
    Abstract: A magnetic recording (PMR) disk structure is described. The PMR disk structure may include a magnetic capping layer being substantially free of an oxide, an upper magnetic layer with an oxide content disposed directly below and in contact with the magnetic capping layer, and an upper exchange coupling layer disposed below the upper magnetic layer.
    Type: Grant
    Filed: March 31, 2011
    Date of Patent: May 12, 2015
    Assignee: WD Media, LLC
    Inventors: Mrugesh Desai, Kyongha Kang, Jian Zhou, B. Ramamurthy Acharya
  • Publication number: 20140300994
    Abstract: Aspects of the present invention relate to a perpendicular magnetic recording (PMR) media stack and methods for fabricating the same. The PMR media stack has a novel grain isolation initiation layer (GIIL) and/or a novel exchange-break layer (EBL) that can improve the signal-to-noise performance of the PMR media stack. The PMR media stack includes a substrate, a soft underlayer on the substrate, an interlayer positioned on the soft underlayer, and a grain isolation initiation layer (GIIL) positioned on the interlayer, a magnetic layer positioned on the GIIL, and an exchange break layer (EBL) positioned on the magnetic layer. The GIIL and/or EBL includes a CoCrRu-oxide.
    Type: Application
    Filed: June 6, 2013
    Publication date: October 9, 2014
    Inventors: DAEHOON HONG, SY VU, KYONGHA KANG, B. RAMAMURTHY ACHARYA
  • Publication number: 20120251846
    Abstract: A magnetic recording (PMR) disk structure is described. The PMR disk structure may include a magnetic capping layer being substantially free of an oxide, an upper magnetic layer with an oxide content disposed directly below and in contact with the magnetic capping layer, and an upper exchange coupling layer disposed below the upper magnetic layer.
    Type: Application
    Filed: March 31, 2011
    Publication date: October 4, 2012
    Applicant: WD MEDIA, INC.
    Inventors: Mrugesh Desai, Kyongha Kang, Jian Zhou, B. Ramamurthy Acharya
  • Publication number: 20120219827
    Abstract: A stack including a crystallographic orientation interlayer, a magnetic zero layer disposed on the interlayer, and a magnetic recording layer disposed on the magnetic zero layer is disclosed. The magnetic zero layer is non-magnetic or has a saturation magnetic flux density (Bs) less than about 100 emu/cc. The magnetic zero layer and the magnetic layer include grains surrounded by a non-magnetic segregant. The magnetic zero layer provides a coherent interface between the interlayer and the magnetic layer with a lattice mismatch less than about 4%.
    Type: Application
    Filed: February 28, 2011
    Publication date: August 30, 2012
    Applicant: SEAGATE TECHNOLOGY LLC
    Inventors: Jai-Young Kim, Thomas P. Nolan, Kyongha Kang, Shoutao Wang, Vincent D. Nguyen, Abebe Hailu, Charles C. Chen