Patents by Inventor Digo Aoki

Digo Aoki 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).

  • CPP giant magnetoresistive head including pinned magnetic layer that extends in the height direction
    Patent number: 7365949
    Abstract: A CPP giant magnetoresistive head includes a lower shield layer; an upper shield layer; and a giant magnetoresistive element (GMR) between the lower shield layer and the upper shield layer. The GMR includes a nonmagnetic material layer; a pinned magnetic layer; and a free magnetic layer. The pinned layer and the free layer are laminated with the nonmagnetic layer provided therebetween. A current flows perpendicularly to a film plane of the GMR, the pinned magnetic layer extends in the height direction longer than in a track-width direction and includes a first portion in the GMR. The first portion is disposed above or below the nonmagnetic layer and the free layer. A second portion is behind the nonmagnetic layer and the free layer in the height direction. The first and second portions are in the same plane. The width of the pinned layer in the track-width direction in the first portion is greater than that in the second portion.
    Type: Grant
    Filed: May 31, 2005
    Date of Patent: April 29, 2008
    Assignee: TDK Corporation
    Inventors: Yasuo Hayakawa, Yoshihiro Nishiyama, Digo Aoki, Masamichi Saito, Naohiro Ishibashi, Kenji Honda
  • CPP giant magnetoresistive head including pinned magnetic layer that extends in the height direction
    Publication number: 20050270703
    Abstract: A CPP giant magnetoresistive head includes a lower shield layer; an upper shield layer; and a giant magnetoresistive element (GMR) between the lower shield layer and the upper shield layer. The GMR includes a nonmagnetic material layer; a pinned magnetic layer; and a free magnetic layer. The pinned layer and the free layer are laminated with the nonmagnetic layer provided therebetween. A current flows perpendicularly to a film plane of the GMR, the pinned magnetic layer extends in the height direction longer than in a track-width direction and includes a first portion in the GMR. The first portion is disposed above or below the nonmagnetic layer and the free layer. A second portion is behind the nonmagnetic layer and the free layer in the height direction. The first and second portions are in the same plane. The width of the pinned layer in the track-width direction in the first portion is greater than that in the second portion.
    Type: Application
    Filed: May 31, 2005
    Publication date: December 8, 2005
    Inventors: Yasuo Hayakawa, Yoshihiro Nishiyama, Digo Aoki, Masamichi Saito, Naohiro Ishibashi, Kenji Honda