Patents by Inventor Koichi NAGASAKA

Koichi NAGASAKA 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 utilizing adjacent underlayer and magnetic layer having particular compositions, magnetic storage apparatus, and method of manufacturing magnetic recording medium
    Patent number: 11189313
    Abstract: A magnetic recording medium includes a substrate, an underlayer provided above the substrate, and a magnetic layer provided on and in contact with the underlayer. The underlayer includes a compound represented by a general formula MgO(1-x), where x falls within a range of 0.07 to 0.25. The magnetic layer includes an alloy having a L10 structure, and the alloy having the L10 structure includes one or more elements selected from a group consisting of Al, Si, Ga, and Ge.
    Type: Grant
    Filed: January 5, 2021
    Date of Patent: November 30, 2021
    Assignee: SHOWA DENKO K.K.
    Inventors: Koichi Nagasaka, Takayuki Fukushima, Lei Zhang, Chen Xu, Hisato Shibata, Takehiro Yamaguchi, Hiroshi Koyanagi, Yuji Umemoto
  • MAGNETIC RECORDING MEDIUM, MAGNETIC STORAGE APPARATUS, AND METHOD OF MANUFACTURING MAGNETIC RECORDING MEDIUM
    Publication number: 20210256998
    Abstract: A magnetic recording medium includes a substrate, an underlayer provided above the substrate, and a magnetic layer provided on and in contact with the underlayer. The underlayer includes a compound represented by a general formula MgO(1-x), where x falls within a range of 0.07 to 0.25. The magnetic layer includes an alloy having a L10 structure, and the alloy having the L10 structure includes one or more elements selected from a group consisting of Al, Si, Ga, and Ge.
    Type: Application
    Filed: January 5, 2021
    Publication date: August 19, 2021
    Inventors: Koichi NAGASAKA, Takayuki FUKUSHIMA, Lei ZHANG, Chen XU, Hisato SHIBATA, Takehiro YAMAGUCHI, Hiroshi KOYANAGI, Yuji UMEMOTO