Patents by Inventor Takayuki Kubomiya

Takayuki Kubomiya 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).

  • Patent number: 7372666
    Abstract: A magnetic head according to the present invention includes a write magnetic pole on which a magnetic film has been formed, and is characterized by the magnetic film being formed by alternately laminating magnetic layers, which have iron (Fe) and cobalt (Co) as main components, and insulating layers, the insulating layers being formed as discontinuous films. With this construction, it is possible to form a write magnetic pole that has a high Bs value and high permeability, so that it is possible to provide a magnetic head that can record onto a high-density medium with a high coercive force.
    Type: Grant
    Filed: April 4, 2005
    Date of Patent: May 13, 2008
    Assignee: Fujitsu Limited
    Inventors: Shoji Ikeda, Takayuki Kubomiya, Masaaki Matsuoka
  • Publication number: 20080107922
    Abstract: The magnetic film includes an FeCo layer, restrains erasing data by a magnetic field leaked from a magnetic pole, has high saturation magnetic flux density and soft magnetism and writes data with high recording density. The magnetic film for a magnetic head of the present invention comprises: a nonmagnetic layer including at least one selected from a group of Ru, Rh, Ir, Cr, Cu, Au, Ag, Pt and Pd; a magnetic layer including Fe and Co. Anisotropy magnetic field is 0.8 kA/m or more.
    Type: Application
    Filed: October 9, 2007
    Publication date: May 8, 2008
    Inventors: Shoji Ikeda, Takayuki Kubomiya, Masaaki Matsuoka
  • Publication number: 20080102317
    Abstract: The magnetic film includes an FeCo layer, restrains erasing data by a magnetic field leaked from a magnetic pole, has high saturation magnetic flux density and soft magnetism and writes data with high recording density. The magnetic film for a magnetic head of the present invention comprises: a nonmagnetic layer including at least one selected from a group of Ru, Rh, Ir, Cr, Cu, Au, Ag, Pt and Pd; a magnetic layer including Fe and Co. Anisotropy magnetic field is 0.8 kA/m or more.
    Type: Application
    Filed: October 9, 2007
    Publication date: May 1, 2008
    Inventors: Shoji IKEDA, Takayuki KUBOMIYA, Masaaki MATSUOKA
  • Patent number: 7294418
    Abstract: The magnetic film includes an FeCo layer, restrains erasing data by a magnetic field leaked from a magnetic pole, has high saturation magnetic flux density and soft magnetism and writes data with high recording density. The magnetic film for a magnetic head of the present invention comprises: a nonmagnetic layer including at least one selected from a group of Ru, Rh, Ir, Cr, Cu, Au, Ag, Pt and Pd; a magnetic layer including Fe and Co. Anisotropy magnetic field is 0.8 kA/m or more.
    Type: Grant
    Filed: February 25, 2004
    Date of Patent: November 13, 2007
    Assignee: Fujitsu Limited
    Inventors: Shoji Ikeda, Takayuki Kubomiya, Masaaki Matsuoka
  • Patent number: 6970324
    Abstract: A soft magnetic film includes a ferromagnetic layer. The ferromagnetic layer is laid over a non-magnetic substructure including ferromagnetic atoms. The uniaxial magnetic anisotropy may be established in the ferromagnetic layer. Since a magnetic property is not required in the substructure under the ferromagnetic layer, the soft magnetic film of this type may be utilized for purposes of wider variations.
    Type: Grant
    Filed: November 19, 2002
    Date of Patent: November 29, 2005
    Assignee: Fujitsu Limited
    Inventors: Shoji Ikeda, Takayuki Kubomiya, Ikuya Tagawa, Yuji Uehara
  • Publication number: 20050185341
    Abstract: A magnetic head according to the present invention includes a write magnetic pole on which a magnetic film has been formed, and is characterized by the magnetic film being formed by alternately laminating magnetic layers, which have iron (Fe) and cobalt (Co) as main components, and insulating layers, the insulating layers being formed as discontinuous films. With this construction, it is possible to form a write magnetic pole that has a high Bs value and high permeability, so that it is possible to provide a magnetic head that can record onto a high-density medium with a high coercive force.
    Type: Application
    Filed: April 4, 2005
    Publication date: August 25, 2005
    Inventors: Shoji Ikeda, Takayuki Kubomiya, Masaaki Matsuoka
  • Publication number: 20050175864
    Abstract: The present invention relates to a magnetic thin film, which has high saturation magnetic flux density Bs of 2.2T or more, which is formed into a flat surface having surface roughness of 5 nm or less and which is capable of preferably being used for a write-head, and a magnetic head. The magnetic thin film includes a FeCo-based alloy layer stacked with a different layer so as to obtain the surface roughness of 5 nm or less. When forming the FeCo-based alloy layer, it is possible to flatten the film surface by performing reactive spattering using a reaction gas such as N2 for each of the layers forming the multi-layered thin film.
    Type: Application
    Filed: March 4, 2005
    Publication date: August 11, 2005
    Applicant: Fujitsu Limited
    Inventors: Shoji Ikeda, Takayuki Kubomiya, Masaaki Matsuoka, Ikuya Tagawa, Junichi Kane, Akifumi Chikazawa, Kazumasa Hosono
  • Publication number: 20050003234
    Abstract: The magnetic film includes an FeCo layer, restrains erasing data by a magnetic field leaked from a magnetic pole, has high saturation magnetic flux density and soft magnetism and writes data with high recording density. The magnetic film for a magnetic head of the present invention comprises: a nonmagnetic layer including at least one selected from a group of Ru, Rh, Ir, Cr, Cu. Au, Ag, Pt and Pd; a magnetic layer including Fe and Co. Anisotropy magnetic field is 0.8 kA/m or more.
    Type: Application
    Filed: February 25, 2004
    Publication date: January 6, 2005
    Inventors: Shoji Ikeda, Takayuki Kubomiya, Masaaki Matsuoka
  • Publication number: 20030147183
    Abstract: A soft magnetic film includes a ferromagnetic layer. The ferromagnetic layer is laid over a non-magnetic substructure including ferromagnetic atoms. The uniaxial magnetic anisotropy may be established in the ferromagnetic layer. Since a magnetic property is not required in the substructure under the ferromagnetic layer, the soft magnetic film of this type may be utilized for purposes of wider variations.
    Type: Application
    Filed: November 19, 2002
    Publication date: August 7, 2003
    Applicant: FUJITSU LIMITED
    Inventors: Shoji Ikeda, Takayuki Kubomiya, Ikuya Tagawa, Yuji Uehara