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).
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Publication number: 20090290265Abstract: 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: ApplicationFiled: December 15, 2008Publication date: November 26, 2009Applicant: FUJITSU LIMITEDInventor: Junichi Kane
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Publication number: 20090291327Abstract: 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: ApplicationFiled: January 22, 2009Publication date: November 26, 2009Applicant: FUJITSU LIMITEDInventor: Junichi Kane
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Publication number: 20070188917Abstract: 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: ApplicationFiled: May 8, 2006Publication date: August 16, 2007Inventors: Junichi Kane, Yuji Uehara, Kenji Noma, Akifumi Chikazawa
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Publication number: 20060209458Abstract: 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: ApplicationFiled: June 21, 2005Publication date: September 21, 2006Inventors: Junichi Kane, Yuji Uehara, Kenji Noma, Akifumi Chikazawa
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Patent number: 7087324Abstract: 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: GrantFiled: September 16, 2003Date of Patent: August 8, 2006Assignee: Fujitsu LimitedInventors: Jongill Hong, Hitoshi Kanai, Junichi Kane, Kenji Noma
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Publication number: 20050276996Abstract: 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: ApplicationFiled: September 16, 2003Publication date: December 15, 2005Inventors: Jongill Hong, Hitoshi Kanai, Junichi Kane, Kenji Noma
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Publication number: 20050175864Abstract: 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: ApplicationFiled: March 4, 2005Publication date: August 11, 2005Applicant: Fujitsu LimitedInventors: Shoji Ikeda, Takayuki Kubomiya, Masaaki Matsuoka, Ikuya Tagawa, Junichi Kane, Akifumi Chikazawa, Kazumasa Hosono
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Patent number: 6851179Abstract: 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: GrantFiled: December 19, 2000Date of Patent: February 8, 2005Assignee: Fujitsu LimitedInventors: Junichi Kane, Hitoshi Kanai, Kenji Noma, Naoki Mukoyama
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Patent number: 6759120Abstract: 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: GrantFiled: November 30, 2000Date of Patent: July 6, 2004Assignee: Fujitsu LimitedInventors: Hong Jongill, Kenichi Aoshima, Kenji Noma, Junichi Kane, Hitoshi Kanai
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Patent number: 6501627Abstract: 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: GrantFiled: November 26, 2001Date of Patent: December 31, 2002Assignee: Fujitsu LimitedInventors: Kenji Noma, Hitoshi Kanai, Junichi Kane, Kenichi Aoshima
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Patent number: 6493196Abstract: 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: GrantFiled: December 29, 1999Date of Patent: December 10, 2002Assignee: Fujitsu Ltd.Inventors: Kenji Noma, Hitoshi Kanai, Junichi Kane, Kenichi Aoshima
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Publication number: 20020054463Abstract: 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: ApplicationFiled: March 15, 2001Publication date: May 9, 2002Applicant: FUJITSU LIMITEDInventors: Naoki Mukoyama, Kenji Noma, Jongill Hong, Junichi Kane
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Publication number: 20020044397Abstract: A spin valve magnetoresistive head using a hard ferromagnetic layer, and a magnetic recording medium drive device using this head are provided.Type: ApplicationFiled: December 6, 2001Publication date: April 18, 2002Applicant: FUJITSU LIMITEDInventors: Kenji Noma, Hitoshi Kanai, Junichi Kane, Kenichi Aoshima
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Publication number: 20020034057Abstract: 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: ApplicationFiled: November 26, 2001Publication date: March 21, 2002Applicant: FUJITSU LIMITEDInventors: Kenji Noma, Hitoshi Kanai, Junichi Kane, Kenichi Aoshima
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Publication number: 20010052181Abstract: Provided is a method for producing a magnetic head whose reproduction waveform has small distortions.Type: ApplicationFiled: December 19, 2000Publication date: December 20, 2001Applicant: FUJITSU LIMITEDInventors: Junichi Kane, Hitoshi Kanai, Kenji Noma, Naoki Mukoyama
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Publication number: 20010014412Abstract: 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: ApplicationFiled: November 30, 2000Publication date: August 16, 2001Applicant: FUJITSU LIMITEDInventors: Hong Jongill, Kenichi Aoshima, Kenji Noma, Junichi Kane, Hitoshi Kanai
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Patent number: 6154349Abstract: 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: GrantFiled: January 16, 1997Date of Patent: November 28, 2000Assignee: Fujitsu LimitedInventors: Hitoshi Kanai, Junichi Kane, Ken'ichiro Yamada
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Patent number: 6123780Abstract: 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: GrantFiled: January 14, 1998Date of Patent: September 26, 2000Assignee: Fujitsu LimitedInventors: Hitoshi Kanai, Kenichi Aoshima, Kenichiro Yamada, Mitsumasa Okada, Eiji Shimizu, Junichi Kane
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Patent number: 5978182Abstract: 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: GrantFiled: November 14, 1997Date of Patent: November 2, 1999Assignee: Fujitsu LimitedInventors: Hitoshi Kanai, Yoshifumi Mizoshita, Junichi Kane, Kenichi Aoshima
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Patent number: 5898546Abstract: 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: GrantFiled: July 17, 1995Date of Patent: April 27, 1999Assignee: Fujitsu LimitedInventors: Hitoshi Kanai, Yoshifumi Mizoshita, Junichi Kane, Kenichi Aoshima