Patents by Inventor Junichi Kane

Junichi Kane 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).

  • Publication number: 20090290265
    Abstract: The magnetic head having shielding layers is capable of preventing fluctuation of output caused by magnetic domain structures of the shielding layers, stabilizing the output, restraining variation of products and improving production yield. The magnetic head comprises: shielding layers for magnetically shielding a magnetoresistance effect reproducing element; hard films being located on the both sides of the magnetoresistance effect reproducing element as seen from a facing surface which faces a recording medium; and soft magnetic layers being composed of a soft magnetic material, the soft magnetic layers being located on the both sides of the shielding layers as seen from the facing surface.
    Type: Application
    Filed: December 15, 2008
    Publication date: November 26, 2009
    Applicant: FUJITSU LIMITED
    Inventor: Junichi Kane
  • Publication number: 20090291327
    Abstract: The magnetic laminated film includes magnetic films having smooth surfaces. The method of manufacturing the magnetic laminated film comprises the steps of: forming a magnetic film including Fe and Co; smoothening a surface of the magnetic film; forming a discontinuous film, which is composed of a magnetic material or an insulating material and which has a thickness to form a discontinuous film, on the smooth surface of the magnetic film; and repeating the above described steps to laminate a plurality of the magnetic films.
    Type: Application
    Filed: January 22, 2009
    Publication date: November 26, 2009
    Applicant: FUJITSU LIMITED
    Inventor: Junichi Kane
  • Publication number: 20070188917
    Abstract: The layered magnetic film has high saturation magnetic flux density and superior soft magnetic characteristics and can be used as a material of a write-head of a magnetic head capable of recording data with high recording density. The layered magnetic film comprises: at least one magnetic layer mainly made of iron (Fe) and cobalt (Co); and at least one NiFe layer, the magnetic layer and the NiFe layer are alternately layered, and the NiFe layer is a discontinuous film.
    Type: Application
    Filed: May 8, 2006
    Publication date: August 16, 2007
    Inventors: Junichi Kane, Yuji Uehara, Kenji Noma, Akifumi Chikazawa
  • Publication number: 20060209458
    Abstract: The soft magnetic film has superior soft magnetic characteristics and is suitable for a thin film magnetic head. The soft magnetic film of the present invention comprises: a magnetic base layer including a ferromagnetic element; and a ferromagnetic layer being piled on the magnetic base layer. The soft magnetic film has uniaxial magnetic anisotropy. The magnetic base layer includes at least one element selected from Fe, Ni and Co as the ferromagnetic element.
    Type: Application
    Filed: June 21, 2005
    Publication date: September 21, 2006
    Inventors: Junichi Kane, Yuji Uehara, Kenji Noma, Akifumi Chikazawa
  • Patent number: 7087324
    Abstract: A magnetoresistive spin-valve sensor is constructed to include a magnetic layer, a specular layer made of a metal oxide, a back layer made of Au, Cu, AuCu, AgCu, AuAgCu or an alloy thereof and interposed between the magnetic layer and the specular layer, and a metal layer disposed adjacent to the specular layer, opposite to the back layer, and made of a metal which improves GMR performance of the magnetoresistive spin-valve sensor.
    Type: Grant
    Filed: September 16, 2003
    Date of Patent: August 8, 2006
    Assignee: Fujitsu Limited
    Inventors: Jongill Hong, Hitoshi Kanai, Junichi Kane, Kenji Noma
  • Publication number: 20050276996
    Abstract: A magnetoresistive spin-valve sensor is constructed to include a magnetic layer, a specular layer made of a metal oxide, a back layer made of Au, Cu, AuCu, AgCu, AuAgCu or an alloy thereof and interposed between the magnetic layer and the specular layer, and a metal layer disposed adjacent to the specular layer, opposite to the back layer, and made of a metal which improves GMR performance of the magnetoresistive spin-valve sensor.
    Type: Application
    Filed: September 16, 2003
    Publication date: December 15, 2005
    Inventors: Jongill Hong, Hitoshi Kanai, Junichi Kane, Kenji Noma
  • 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
  • Patent number: 6851179
    Abstract: The present invention provides a method for producing a magnetic head whose reproduction waveform has small distortions, and forming a hard magnetism layer for applying a bias magnetic field to a magnetoresistive element, which is a multilayer film including a fixed magnetic layer having magnetization fixed to a first direction and a free magnetic layer having an easy axis of magnetization that is directed to a second direction, is formed in an area including at least one of a front area in the first direction and a rear area in the first direction.
    Type: Grant
    Filed: December 19, 2000
    Date of Patent: February 8, 2005
    Assignee: Fujitsu Limited
    Inventors: Junichi Kane, Hitoshi Kanai, Kenji Noma, Naoki Mukoyama
  • Patent number: 6759120
    Abstract: There is disclosed a magnetoresistive film in which increase of a coupling field accompanying thickness reduction of a middle layer is inhibited. The magnetoresistive film is a multilayered film including a pinned layer 3 having magnetization whose direction is fixed, a nonmagnetic middle layer 4 formed on the pinned layer, and a free layer 5 formed on the middle layer and provided with magnetization whose direction changes in accordance with an external magnetic field, the magnetoresistive film indicates a magnitude of resistance in accordance with an angle formed by the magnetization direction of the pinned layer and the magnetization direction of the free layer, and a copper oxide layer 7 of an oxide including a copper element is formed directly on the free layer, or on the free layer via an oxide layer 6 of a material fabricated by oxidizing a material constituting the free layer.
    Type: Grant
    Filed: November 30, 2000
    Date of Patent: July 6, 2004
    Assignee: Fujitsu Limited
    Inventors: Hong Jongill, Kenichi Aoshima, Kenji Noma, Junichi Kane, Hitoshi Kanai
  • Patent number: 6501627
    Abstract: A spin-valve magnetoresistive head having end parts of a free magnetic layer insensitive to an external magnetic field so as to improve sensitivity is provided. The spin-valve magnetoresistive head includes, at least on the terminal part sides, a lamination formed of a first antiferromagnetic layer, a soft magnetic layer, an antiparallel coupling intermediate layer, and a first free magnetic layer.
    Type: Grant
    Filed: November 26, 2001
    Date of Patent: December 31, 2002
    Assignee: Fujitsu Limited
    Inventors: Kenji Noma, Hitoshi Kanai, Junichi Kane, Kenichi Aoshima
  • Patent number: 6493196
    Abstract: A spin-valve magnetoresistive sensor includes a free layer of a ferromagnetic material, a pinned layer provided on the free layer and a pinning layer of an anti-ferromagnetic material provided on the pinned layer, the anti-ferromagnetic material being an ordered alloy containing manganese. The pinned layer includes a first pinned layer of a ferromagnetic material, a second pinned layer of a ferromagnetic material provided on the first pinned layer and an intermediate layer interposed between the first and second pinned layers such that the first and second pinned layers establish a super-exchange interaction in an anti-parallel manner. The second pinned layer has a magnetic moment smaller than a magnetic moment of the first pinned layer.
    Type: Grant
    Filed: December 29, 1999
    Date of Patent: December 10, 2002
    Assignee: Fujitsu Ltd.
    Inventors: Kenji Noma, Hitoshi Kanai, Junichi Kane, Kenichi Aoshima
  • Publication number: 20020054463
    Abstract: A spin-valve magneto-resistive element is provided with a free magnetic layer having a first surface and a second surface opposite to the first surface, a first stacked structure including a first nonmagnetic metal layer, a first pinned magnetic layer and a first antiferromagnetic layer which are successively stacked on the first surface of the free magnetic layer, and a second stacked structure including a second nonmagnetic metal layer, a second pinned magnetic layer and a second antiferromagnetic layer which are successively stacked on the second surface of the free magnetic layer. A direction of an exchange coupled field between the first pinned magnetic layer and the free magnetic layer and a direction of an exchange coupled field between the second pinned magnetic layer and the free magnetic layer are antiparallel.
    Type: Application
    Filed: March 15, 2001
    Publication date: May 9, 2002
    Applicant: FUJITSU LIMITED
    Inventors: Naoki Mukoyama, Kenji Noma, Jongill Hong, Junichi Kane
  • Publication number: 20020044397
    Abstract: A spin valve magnetoresistive head using a hard ferromagnetic layer, and a magnetic recording medium drive device using this head are provided.
    Type: Application
    Filed: December 6, 2001
    Publication date: April 18, 2002
    Applicant: FUJITSU LIMITED
    Inventors: Kenji Noma, Hitoshi Kanai, Junichi Kane, Kenichi Aoshima
  • Publication number: 20020034057
    Abstract: A spin-valve magnetoresistive head having end parts of a free magnetic layer insensitive to an external magnetic field so as to improve sensitivity is provided.
    Type: Application
    Filed: November 26, 2001
    Publication date: March 21, 2002
    Applicant: FUJITSU LIMITED
    Inventors: Kenji Noma, Hitoshi Kanai, Junichi Kane, Kenichi Aoshima
  • Publication number: 20010052181
    Abstract: Provided is a method for producing a magnetic head whose reproduction waveform has small distortions.
    Type: Application
    Filed: December 19, 2000
    Publication date: December 20, 2001
    Applicant: FUJITSU LIMITED
    Inventors: Junichi Kane, Hitoshi Kanai, Kenji Noma, Naoki Mukoyama
  • Publication number: 20010014412
    Abstract: There is disclosed a magnetoresistive film in which increase of a coupling field accompanying thickness reduction of a middle layer is inhibited. The magnetoresistive film is a multilayered film including a pinned layer 3 having magnetization whose direction is fixed, a nonmagnetic middle layer 4 formed on the pinned layer, and a free layer 5 formed on the middle layer and provided with magnetization whose direction changes in accordance with an external magnetic field, the magnetoresistive film indicates a magnitude of resistance in accordance with an angle formed by the magnetization direction of the pinned layer and the magnetization direction of the free layer, and a copper oxide layer 7 of an oxide including a copper element is formed directly on the free layer, or on the free layer via an oxide layer 6 of a material fabricated by oxidizing a material constituting the free layer.
    Type: Application
    Filed: November 30, 2000
    Publication date: August 16, 2001
    Applicant: FUJITSU LIMITED
    Inventors: Hong Jongill, Kenichi Aoshima, Kenji Noma, Junichi Kane, Hitoshi Kanai
  • Patent number: 6154349
    Abstract: A magnetoresistive transducer includes a multilayer provided with a first soft magnetic layer, a conductive nonmagnetic layer, a second soft magnetic layer, and a biasing magnetic layer giving a magnetization of a predetermined direction to the second soft magnetic layer, in that order of superposition. The first soft magnetic layer is a multilayer superposed structure including a (Co.sub.y Fe.sub.100-y).sub.100-x Z.sub.x alloy layer where Z represents boron and x and y represent atomic fractions (at %), and an alloy layer containing at least Ni and Fe. The (Co.sub.y Fe.sub.100-y).sub.100-x Z.sub.x alloy layer ofthe first soft magnetic layer borders on the nonmagnetic layer and has a face-centered cubic lattice structure with a d spacing smaller than a d spacing of a Co.sub.y Fe.sub.100-y alloy. A pair of electrodes are formed on the multilayer for allowing a sense current to pass through the multilayer.
    Type: Grant
    Filed: January 16, 1997
    Date of Patent: November 28, 2000
    Assignee: Fujitsu Limited
    Inventors: Hitoshi Kanai, Junichi Kane, Ken'ichiro Yamada
  • Patent number: 6123780
    Abstract: A method for manufacturing a spin valve GMR head is describe in which a fixed magnetic layer of the head may maintain magnetization in a desired orientation. In one aspect of the invention, the method comprises steps of: forming a magnetic film including at least a free magnetic layer, a non-magnetic metallic layer, a fixed magnetic layer, and a magnetic domain control layer; subjecting the magnetic film to a first heat treatment under a magnetic field to enhance magnetic anisotropy of the free magnetic layer; and subjecting the magnetic film to a second heat treatment under a magnetic field and at a higher temperature than the maximum temperature applied in the processes that precede the second heat treatment, to fix the magnetization in the fixed magnetic layer.
    Type: Grant
    Filed: January 14, 1998
    Date of Patent: September 26, 2000
    Assignee: Fujitsu Limited
    Inventors: Hitoshi Kanai, Kenichi Aoshima, Kenichiro Yamada, Mitsumasa Okada, Eiji Shimizu, Junichi Kane
  • Patent number: 5978182
    Abstract: The present invention relates to a magnetoresistive head capable of converting a change in a magnetic field generated by a magnetic recording medium into a change in electric resistivity by utilizing spin valve magnetoresistance effect to read signal information. The magnetoresistive head comprises a first magnetic layer, a second magnetic layer formed on the first magnetic layer through a first nonmagnetic metal layer and magnetized in one direction, a third magnetic layer formed on the second magnetic layer through a second nonmagnetic metal layer, and an electric current supplying layer for applying a constant current to at least the third magnetic layer, the second nonmagnetic metal layer and the second magnetic layer in one of the same direction as and the opposite direction to the direction of magnetization of the second magnetic layer.
    Type: Grant
    Filed: November 14, 1997
    Date of Patent: November 2, 1999
    Assignee: Fujitsu Limited
    Inventors: Hitoshi Kanai, Yoshifumi Mizoshita, Junichi Kane, Kenichi Aoshima
  • Patent number: 5898546
    Abstract: The present invention relates to a magnetoresistive head capable of converting a change in a magnetic field generated by a magnetic recording medium into a change in electric resistivity by utilizing spin valve magnetoresistance effect to read signal information. The magnetoresistive head comprises a first magnetic layer, a second magnetic layer formed on the first magnetic layer through a first nonmagnetic metal layer and magnetized in one direction, a third magnetic layer formed on the second magnetic layer through a second nonmagnetic metal layer, and an electric current supplying layer for applying a constant current to at least the third magnetic layer, the second nonmagnetic metal layer and the second magnetic layer in one of the same direction as and the opposite direction to the direction of magnetization of the second magnetic layer.
    Type: Grant
    Filed: July 17, 1995
    Date of Patent: April 27, 1999
    Assignee: Fujitsu Limited
    Inventors: Hitoshi Kanai, Yoshifumi Mizoshita, Junichi Kane, Kenichi Aoshima