Patents by Inventor Takasada Shibauchi

Takasada Shibauchi 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).

  • Smoothing and stabilization of domain walls in perpendicularly polarized magnetic films
    Patent number: 6579635
    Abstract: A ferromagnetic film suitable for ultra-high density perpendicular recording, and a process for producing the film. The process generally entails forming a film of ferromagnetic material on a surface of a substrate, such that the film is characterized by perpendicular magnetic anisotropy and comprises a plurality of magnetic domains defined by domain walls perpendicular to a major surface of the film. The ferromagnetic film is formed to have a linear strain defect for the purpose of smoothing and stabilizing the domain walls during subsequent magnetization reversal of the ferromagnetic material. Such smoothing and stabilizing serves to control temporal magnetic noise due to motion of magnetic domains, arrest domain wall motion (reducing velocity) when the film is subjected to the magnetic reversal fields, and controls spatial magnetic noise due to domain wall jaggedness.
    Type: Grant
    Filed: July 26, 2001
    Date of Patent: June 17, 2003
    Assignee: International Business Machines Corporation
    Inventors: Lia Krusin-Elbaum, Takasada Shibauchi
  • Smoothing and stabilization of domain walls in perpendicularly polarized magnetic films
    Publication number: 20020094457
    Abstract: A ferromagnetic film suitable for ultra-high density perpendicular recording, and a process for producing the film. The process generally entails forming a film of ferromagnetic material on a surface of a substrate, such that the film is characterized by perpendicular magnetic anisotropy and comprises a plurality of magnetic domains defined by domain walls perpendicular to a major surface of the film. The ferromagnetic film is formed to have a linear strain defect for the purpose of smoothing and stabilizing the domain walls during subsequent magnetization reversal of the ferromagnetic material. Such smoothing and stabilizing serves to control temporal magnetic noise due to motion of magnetic domains, arrest domain wall motion (reducing velocity) when the film is subjected to the magnetic reversal fields, and controls spatial magnetic noise due to domain wall jaggedness.
    Type: Application
    Filed: July 26, 2001
    Publication date: July 18, 2002
    Applicant: INTERNATIONAL BUSINESS MACHINES CORPORATION
    Inventors: Lia Krusin-Elbaum, Takasada Shibauchi