Patents by Inventor Kazumi Matsuzaka

Kazumi Matsuzaka 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).

  • Exchange-coupled film including pinned magnetic layer composed of a plurality of cobalt-iron alloys having different compositions disposed on antiferromagnetic layer, and magnetic sensing element
    Patent number: 7369372
    Abstract: An exchange-coupled film includes a ferromagnetic layer and an antiferromagnetic layer disposed on each other, the magnetization direction of the ferromagnetic layer being pinned in one direction by an exchange coupling magnetic field generated at the interface between the ferromagnetic layer and the antiferromagnetic layer, wherein the antiferromagnetic layer is composed of IrzMn100-z (wherein 2 atomic percent?z?80 atomic percent), the ferromagnetic layer has a two-layer structure including a CoyFe100-y layer having a face-centered cubic structure (wherein 80 atomic percent?y?100 atomic percent), the CoyFe100-y layer being in contact with the antiferromagnetic layer, and an FexCo100-x layer (wherein x?30 atomic percent), the FexCo100-x layer being disposed on the CoyFe100-y layer, and the thickness of the FexCo100-x layer is 30% to 90% of the total thickness of the ferromagnetic layer.
    Type: Grant
    Filed: November 8, 2005
    Date of Patent: May 6, 2008
    Assignee: Alps Electric Co., Ltd
    Inventors: Kazuaki Ikarashi, Naoya Hasegawa, Eiji Umetsu, Kazumi Matsuzaka, Takuya Seino
  • Magnetic sensing element comprising a pinned magnetic layer, a free magnetic layer, and a nonmagnetic conductive layer disposed therebetween
    Patent number: 7312960
    Abstract: A magnetic sensing element is provided in which the magnetization of a pinned magnetic layer is pinned by a uniaxial anisotropy of the pinned magnetic layer itself. A nonmagnetic layer for increasing the coercive force of the pinned magnetic layer is disposed adjacent to the pinned magnetic layer at the opposite side of a nonmagnetic conductive layer. Specifically, the nonmagnetic layer is composed of, for example, Cu. In addition, the thickness of the nonmagnetic layer is adequately controlled.
    Type: Grant
    Filed: March 3, 2005
    Date of Patent: December 25, 2007
    Assignee: Alps Electric Co., Ltd.
    Inventors: Kazumi Matsuzaka, Eiji Umetsu, Naoya Hasegawa
  • Exchange-coupled film including pinned magnetic layer composed of a plurality of cobalt-iron alloys having different compositions disposed on antiferromagnetic layer, and magnetic sensing element
    Publication number: 20060098355
    Abstract: An exchange-coupled film includes a ferromagnetic layer and an antiferromagnetic layer disposed on each other, the magnetization direction of the ferromagnetic layer being pinned in one direction by an exchange coupling magnetic field generated at the interface between the ferromagnetic layer and the antiferromagnetic layer, wherein the antiferromagnetic layer is composed of IrzMn100-z (wherein 2 atomic percent?z?80 atomic percent), the ferromagnetic layer has a two-layer structure including a CoyFe100-y layer having a face-centered cubic structure (wherein 80 atomic percent?y?100 atomic percent), the CoyFe100-y layer being in contact with the antiferromagnetic layer, and an FexCo100-x layer (wherein x?30 atomic percent), the FexCo100-x layer being disposed on the CoyFe100-y layer, and the thickness of the FexCo100-x layer is 30% to 90% of the total thickness of the ferromagnetic layer.
    Type: Application
    Filed: November 8, 2005
    Publication date: May 11, 2006
    Inventors: Kazuaki Ikarashi, Naoya Hasegawa, Eiji Umetsu, Kazumi Matsuzaka, Takuya Seino
  • Magnetic sensing element pinning magnetization of pinned magnetic layer by uniaxial anisotropy of pinned magnetic layer itself
    Publication number: 20050207072
    Abstract: A magnetic sensing element is provided in which the magnetization of a pinned magnetic layer is pinned by a uniaxial anisotropy of the pinned magnetic layer itself. A nonmagnetic layer for increasing the coercive force of the pinned magnetic layer is disposed adjacent to the pinned magnetic layer at the opposite side of a nonmagnetic conductive layer. Specifically, the nonmagnetic layer is composed of, for example, Cu. In addition, the thickness of the nonmagnetic layer is adequately controlled.
    Type: Application
    Filed: March 3, 2005
    Publication date: September 22, 2005
    Inventors: Kazumi Matsuzaka, Eiji Umetsu, Naoya Hasegawa