Patents by Inventor Keiichi Nagasawa

Keiichi Nagasawa 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).

  • GMR head, method for its manufacture, and magnetic disc drive utilizing the head
    Patent number: 6327121
    Abstract: The invention provides a GMR head in which an adequate bias point may be set for the free magnetic layer 12 of the GMR head by suppressing the static magnetic field in the free magnetic layer which arises from a pinned magnetic layer 14 of the GMR head. The GMR head comprises a sensor section 10, a magnetic field correction section 20 disposed laterally adjacent to the sensor section 10. The sensor section 10 includes, in addition to the free magnetic layer 12 and the pinned magnetic layer 14, an intermediate layer 13 and an anti-ferromagnetic layer 15 in a specific arrangement. The magnetic field correction section 20 may have the same structure as the sensor section 10.
    Type: Grant
    Filed: November 13, 1998
    Date of Patent: December 4, 2001
    Assignee: Fujitsu Limited
    Inventors: Keiichi Nagasawa, Yutaka Shimizu, Hitoshi Kishi, Atsushi Tanaka, Reiko Kondoh