Patents by Inventor Ryosho Nakane

Ryosho Nakane 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 element, magnetic memory, magnetic recording method, method for fabricating a magnetic recording element, and method for fabricating a magnetic memory
    Patent number: 6757192
    Abstract: A magnetic recording element is composed of a first magnetic film to generate spin vortex by an external magnetic field and a second magnetic film having a magnetization perpendicular to the surfaces thereof, and also an insulating layer to control (repress) a current through the magnetic recording element which is formed between the first magnetic film and the second magnetic film. A given external magnetic field is applied to the magnetic recording element, to generate a spin vortex in the first magnetic film and then, generate a vertical magnetization at the center of the spin vortex. Then, a given data is written on the vertical magnetization.
    Type: Grant
    Filed: May 17, 2002
    Date of Patent: June 29, 2004
    Assignee: Hokkaido University
    Inventors: Koichi Mukasa, Makoto Sawamura, Kazuhisa Sueoka, Eiichi Hirota, Ryosho Nakane, Motonori Nakamura
  • Method and apparatus for multiplying a frequency of an electromagnetic wave
    Patent number: 6577213
    Abstract: A ferromagnetic film, which has an inherent resonant frequency, is disposed in a cavity resonator. An electromagnetic wave, which has an input frequency equal to the resonant frequency of the ferromagnetic film, is introduced to the ferromagnetic film from an orifice of the cavity resonator to generate a ferromagnetic resonance in the ferromagnetic film, and thus, multiply the input frequency of the electromagnetic wave.
    Type: Grant
    Filed: January 22, 2002
    Date of Patent: June 10, 2003
    Assignee: Hokkaido University
    Inventors: Hideki Watanabe, Makoto Sawamura, Kazuhisa Sueoka, Koichi Mukasa, Ryosho Nakane
  • Method and apparatus for magnetic recording
    Patent number: 6504665
    Abstract: To provide a magnetic recording method and apparatus which utilize a spin vortex as a recording unit and which enables high density recording, spin vortices (2) are recorded on a recording medium (1) such that the spin vortices (2) are aligned to form a recording track (3). The recording medium (1) is formed of a magnetic super-thin film, and positive and negative recorded spin vortices (2) are aligned thereon.
    Type: Grant
    Filed: November 23, 1999
    Date of Patent: January 7, 2003
    Assignee: Japan Science and Technology Corporation
    Inventors: Koichi Mukasa, Soshin Chikazumi, Eichi Hirota, Ryosho Nakane, Makoto Sawamura
  • Magnetic recording element, magnetic memory, magnetic recording method, method for a fabricating a magnetic recording element, and method for a fabricating a magnetic memory
    Publication number: 20020196658
    Abstract: A magnetic recording element is composed of a first magnetic film to generate spin vortex by an external magnetic field and a second magnetic film having a magnetization perpendicular to the surfaces thereof, and also an insulating layer to control (repress) a current through the magnetic recording element which is formed between the first magnetic film and the second magnetic film. A given external magnetic field is applied to the magnetic recording element, to generate a spin vortex in the first magnetic film and then, generate a vertical magnetization at the center of the spin vortex. Then, a given data is written on the vertical magnetization.
    Type: Application
    Filed: May 17, 2002
    Publication date: December 26, 2002
    Applicant: HOKKAIDO UNIVERSITY
    Inventors: Koichi Mukasa, Makoto Sawamura, Kazuhisa Sueoka, Eiichi Hirota, Ryosho Nakane, Motonori Nakamura
  • Method and apparatus for multiplying a frequency of an electromagnetic wave
    Publication number: 20020135443
    Abstract: A ferromagnetic film, which has an inherent resonant frequency, is disposed in a cavity resonator. An electromagnetic wave, which has an input frequency equal to the resonant frequency of the ferromagnetic film, is introduced to the ferromagnetic film from an orifice of the cavity resonator to generate a ferromagnetic resonance in the ferromagnetic film, and thus, multiply the input frequency of the electromagnetic wave.
    Type: Application
    Filed: January 22, 2002
    Publication date: September 26, 2002
    Inventors: Hideki Watanabe, Makoto Sawamura, Kazuhisa Sueoka, Koichi Mukasa, Ryosho Nakane