Patents by Inventor Hiroyuko Suzuki

Hiroyuko Suzuki 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).

  • Magnetic recording medium for high density recording and magnetic storage device using same
    Publication number: 20090258253
    Abstract: In one embodiment, a magnetic recording medium comprises an underlying film, a magnetic film and a protective film formed in this order on a substrate. The magnetic film is a cobalt-base alloy film containing chromium and has a plurality of magnetic layers stacked without interposition of any non-magnetic layer. The plural magnetic layers comprise first, second and third magnetic layers. The first magnetic layer is disposed between the underlying film and the second magnetic layer. The second magnetic layer is disposed between the first magnetic layer and the third magnetic layer. The third magnetic layer is disposed between the second magnetic layer and the protective film. The concentration of chromium contained in the first magnetic layer is lower than that of chromium contained in the second magnetic layer. The thickness of the first magnetic layer is smaller than that of the second magnetic layer. The magnetic layers which overlie the first magnetic layer further contain platinum and boron.
    Type: Application
    Filed: April 28, 2009
    Publication date: October 15, 2009
    Applicant: Hitachi Global Storage Technologies Netherlands B.V.
    Inventors: Tatsuya Hinoue, Yotsuo Yahisa, Tomoo Yamamoto, Joe Inagaki, Hiroyuko Suzuki, Hidekazu Kashiwase
  • Magnetic recording medium having a cobalt-based alloy film for high density recording and magnetic storage device using same
    Patent number: 7545604
    Abstract: In one embodiment, a magnetic recording medium comprises an underlying film, a magnetic film and a protective film formed in this order on a substrate. The magnetic film is a cobalt-base alloy film containing chromium and has a plurality of magnetic layers stacked without interposition of any non-magnetic layer. The plural magnetic layers comprise first, second and third magnetic layers. The first magnetic layer is disposed between the underlying film and the second magnetic layer. The second magnetic layer is disposed between the first magnetic layer and the third magnetic layer. The third magnetic layer is disposed between the second magnetic layer and the protective film. The concentration of chromium contained in the first magnetic layer is lower than that of chromium contained in the second magnetic layer. The thickness of the first magnetic layer is smaller than that of the second magnetic layer. The magnetic layers which overlie the first magnetic layer further contain platinum and boron.
    Type: Grant
    Filed: December 22, 2005
    Date of Patent: June 9, 2009
    Assignee: Hitachi Global Storage Technologies Netherlands B.V.
    Inventors: Tatsuya Hinoue, Yotsuo Yahisa, Tomoo Yamamoto, Joe Inagaki, Hiroyuko Suzuki, Hidekazu Kashiwase
  • Magnetic recording medium for high density recording and magnetic storage device using same
    Publication number: 20060139806
    Abstract: In one embodiment, a magnetic recording medium comprises an underlying film, a magnetic film and a protective film formed in this order on a substrate. The magnetic film is a cobalt-base alloy film containing chromium and has a plurality of magnetic layers stacked without interposition of any non-magnetic layer. The plural magnetic layers comprise first, second and third magnetic layers. The first magnetic layer is disposed between the underlying film and the second magnetic layer. The second magnetic layer is disposed between the first magnetic layer and the third magnetic layer. The third magnetic layer is disposed between the second magnetic layer and the protective film. The concentration of chromium contained in the first magnetic layer is lower than that of chromium contained in the second magnetic layer. The thickness of the first magnetic layer is smaller than that of the second magnetic layer. The magnetic layers which overlie the first magnetic layer further contain platinum and boron.
    Type: Application
    Filed: December 22, 2005
    Publication date: June 29, 2006
    Applicant: Hitachi Global Storage Technologies Netherlands B.V.
    Inventors: Tatsuya Hinoue, Yotsuo Yahisa, Tomoo Yamamoto, Joe Inagaki, Hiroyuko Suzuki, Hidekazu Kashiwase