Patents by Inventor Hiroyuki Hoshiya

Hiroyuki Hoshiya 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: 20200234729
    Abstract: Disclosed herein are magnetic write heads for providing spin-torque-assisted write field enhancement, and hard disk drives comprising such magnetic write heads. Within the write gap, each magnetic write head comprises a main pole, a trailing shield, a spacer disposed between the main pole and the trailing shield, a non-magnetic layer disposed between the main pole and the trailing shield, and a magnetic DC-field-generation (DFG) layer adjacent to the spacer and disposed between the spacer and the non-magnetic layer. In some embodiments, the DFG layer is the only magnetic layer within the write gap that is not adjacent to the main pole or the trailing shield.
    Type: Application
    Filed: January 22, 2020
    Publication date: July 23, 2020
    Applicant: Western Digital Technologies, Inc.
    Inventors: James Terrence OLSON, Hiroyuki HOSHIYA, Alexander GONCHAROV, Masato SHIIMOTO, Mikito SUGIYAMA
  • Patent number: 10546603
    Abstract: Disclosed herein are magnetic write heads and hard disk drives comprising such magnetic write heads. A magnetic head comprises a magnetic pole, a first shield separated from the magnetic pole at an air-bearing surface (ABS) of the magnetic head, a magnetic layer disposed between the magnetic pole and the first shield, wherein the magnetic layer comprises at least of iron, cobalt, or nickel, a first non-magnetic layer disposed between the magnetic pole and the magnetic layer, and a second non-magnetic layer disposed between the magnetic layer and the first shield, wherein the magnetic layer is the only magnetic layer at the ABS that is between the main pole and the first shield that is not adjacent to the main pole or the first shield.
    Type: Grant
    Filed: June 13, 2019
    Date of Patent: January 28, 2020
    Assignee: Western Digital Technologies, Inc.
    Inventors: James Terrence Olson, Hiroyuki Hoshiya, Alexander Goncharov, Masato Shiimoto, Mikito Sugiyama
  • Publication number: 20190295572
    Abstract: Disclosed herein are magnetic write heads and hard disk drives comprising such magnetic write heads. A magnetic head comprises a magnetic pole, a first shield separated from the magnetic pole at an air-bearing surface (ABS) of the magnetic head, a magnetic layer disposed between the magnetic pole and the first shield, wherein the magnetic layer comprises at least of iron, cobalt, or nickel, a first non-magnetic layer disposed between the magnetic pole and the magnetic layer, and a second non-magnetic layer disposed between the magnetic layer and the first shield, wherein the magnetic layer is the only magnetic layer at the ABS that is between the main pole and the first shield that is not adjacent to the main pole or the first shield.
    Type: Application
    Filed: June 13, 2019
    Publication date: September 26, 2019
    Applicant: Western Digital Technologies, Inc.
    Inventors: James Terrence OLSON, Hiroyuki HOSHIYA, Alexander GONCHAROV, Masato SHIIMOTO, Mikito SUGIYAMA
  • Patent number: 10366714
    Abstract: Disclosed herein are magnetic write heads for providing spin-torque-assisted write field enhancement, and hard disk drives comprising such magnetic write heads. Within the write gap, each magnetic write head comprises a main pole, a trailing shield, a spacer disposed between the main pole and the trailing shield, a non-magnetic layer disposed between the main pole and the trailing shield, and a magnetic DC-field-generation (DFG) layer adjacent to the spacer and disposed between the spacer and the non-magnetic layer. In some embodiments, the DFG layer is the only magnetic layer within the write gap that is not adjacent to the main pole or the trailing shield.
    Type: Grant
    Filed: July 26, 2017
    Date of Patent: July 30, 2019
    Assignee: Western Digital Technologies, Inc.
    Inventors: James Terrence Olson, Hiroyuki Hoshiya, Alexander Goncharov, Masato Shiimoto, Mikito Sugiyama
  • Patent number: 9488702
    Abstract: A magnetic sensor includes a plurality of magneto-resistive effect elements each configured by using a magneto-resistive effect film formed by laminating a pinned layer, a nonmagnetic layer, and a free layer in order from a side of a substrate. A first linear pattern is formed in a first portion on the substrate in a first direction. A second linear pattern is formed in a second portion on the substrate in a second direction. A magnetization direction of the first portion is different from a magnetization direction of the second portion. The magneto-resistive effect film is further formed on the substrate. Each of the plurality of magneto-resistive effect elements includes a pair of electrodes formed by the magneto-resistive effect film processed into a predetermined shape.
    Type: Grant
    Filed: July 14, 2014
    Date of Patent: November 8, 2016
    Assignee: HITACHI METALS, LTD.
    Inventors: Kenichi Meguro, Hiroyuki Hoshiya, Keizou Katou, Yasunori Abe
  • Patent number: 9245548
    Abstract: Embodiments of the present invention help to reduce mag-noise in a magnetoresistive head without deterioration in reproduced output and improve the signal/noise ratio (SNR) of the magnetoresistive head. According to one embodiment, the magnetoresistive head uses a synthetic ferri free layer and it is arranged such that the magnetic field which is applied to an end of a free layer with smaller film thickness and saturation magnetization in the track width direction by a coupling field is larger than the magnetic field which is applied to it by a bias layer.
    Type: Grant
    Filed: January 25, 2008
    Date of Patent: January 26, 2016
    Assignee: HGST Netherlands B.V.
    Inventors: Masato Shiimoto, Hiroyuki Katada, Kazuhiro Nakamoto, Hiroyuki Hoshiya
  • Patent number: 9047885
    Abstract: Embodiments of the present invention provide a perpendicular magnetic recording head which can suppress reduction in recording field and efficiently reduce a fringe field. According to one embodiment, a side shield disposed at a side of each side face in a cross track direction of a main pole is arranged at a far leading side compared with the main pole.
    Type: Grant
    Filed: November 21, 2008
    Date of Patent: June 2, 2015
    Assignee: HGST Netherlands B.V.
    Inventors: Mikito Sugiyama, Isao Nunokawa, Hiroyuki Hoshiya
  • Patent number: 9036307
    Abstract: A heat-assisted magnetic recording (HAMR) air-bearing slider has an optically-transparent protective film over the near-field transducer (NFT) to protect the NFT from excessive heat caused by the accumulation of carbonaceous material on the slider's overcoat. The NFT is thus separated from the overcoat by the protective film. The protective film does not cover the write pole end, which is covered only by the overcoat, so there is no spacing loss between the write pole end and the recording layer on the disk. In one embodiment the protective film is coplanar with the recording-layer-facing surface of the slider and the overcoat covers both the protective film and the write pole end. In another embodiment the overcoat has a window that surrounds the protective film, with the protective film being substantially coplanar with the air-bearing surface (ABS) of the slider. In both embodiments the smooth topography of the slider's ABS is maintained.
    Type: Grant
    Filed: October 9, 2014
    Date of Patent: May 19, 2015
    Assignee: HGST Netherlands B.V.
    Inventors: Hiroyuki Hoshiya, Tomomitsu Inoue, Tetsuya Matsusaki, Harukazu Miyamoto, Kazuhito Miyata, Kentaro Namikawa, Atsuko Okawa
  • Publication number: 20140320117
    Abstract: A magnetic sensor includes a plurality of magneto-resistive effect elements each configured by using a magneto-resistive effect film formed by laminating a pinned layer, a nonmagnetic layer, and a free layer in order from a side of a substrate. A first linear pattern is formed in a first portion on the substrate in a first direction. A second linear pattern is formed in a second portion on the substrate in a second direction. A magnetization direction of the first portion is different from a magnetization direction of the second portion. The magneto-resistive effect film is further formed on the substrate. Each of the plurality of magneto-resistive effect elements includes a pair of electrodes formed by the magneto-resistive effect film processed into a predetermined shape.
    Type: Application
    Filed: July 14, 2014
    Publication date: October 30, 2014
    Applicant: Hitachi Metals, Ltd.
    Inventors: Kenichi Meguro, Hiroyuki Hoshiya, Keizou Katou, Yasunori Abe
  • Patent number: 8778515
    Abstract: Embodiments of the present invention provide a practical magneto-resistive effect element for CPP-GMR, which exhibits appropriate resistance-area-product and high magnetoresistance change ratio, and meets the demand for a narrow read gap. Certain embodiments of a magneto-resistive effect element in accordance with the present invention include a pinned ferromagnetic layer containing a first ferromagnetic film having a magnetization direction fixed in one direction, a free ferromagnetic layer containing a second ferromagnetic film having a magnetization direction varying in response to an external magnetic field, an intermediate layer provided between the pinned ferromagnetic layer and the free ferromagnetic layer, and a current confinement layer for confining a current. At least one of the pinned ferromagnetic layer or the free ferromagnetic layer includes a highly spin polarized layer.
    Type: Grant
    Filed: November 21, 2008
    Date of Patent: July 15, 2014
    Assignee: HGST Netherlands B.V.
    Inventors: Yo Sato, Katsumi Hoshino, Hiroyuki Hoshiya
  • Patent number: 8779764
    Abstract: To provide a method which can define the direction and orientation of magnetization of a pinned layer while reducing the number of steps of forming a GMR film. The magnetization direction of the pinned layer is defined in a plurality of directions by forming a plurality of patterns having directivities. Further, when the magneto-resistive effect film is formed, a magnetic field is applied in a direction at an angle set between the angles of the plurality of patterns.
    Type: Grant
    Filed: July 13, 2010
    Date of Patent: July 15, 2014
    Assignee: Hitachi Metals, Ltd.
    Inventors: Kenichi Meguro, Hiroyuki Hoshiya, Keizou Katou, Yasunori Abe
  • Patent number: 8570689
    Abstract: According to one embodiment, a differential magnetoresistive effect element comprises a first magnetoresistive effect element having a first pinning layer, a first intermediate layer, and a first free layer. The differential magnetoresistive effect element also comprises a second magnetoresistive effect element stacked via a spacer layer above the first magnetoresistive effect element, the second magnetoresistive effect element having a second pinning layer, a second intermediate layer, and a second free layer. The first magnetoresistive effect element and the second magnetoresistive effect element show in-opposite-phase resistance change in response to a magnetic field in the same direction, and tp2>tp1 is satisfied when a thickness of the first pinning layer is tp1, and a thickness of the second pinning layer is tp2. In another embodiment, the first and second magnetoresistive effect elements may be CPP-GMR elements.
    Type: Grant
    Filed: December 1, 2009
    Date of Patent: October 29, 2013
    Assignee: HGST Netherlands B.V.
    Inventors: Yo Sato, Katsumi Hoshino, Masato Shiimoto, Takeshi Nakagawa, Hiroyuki Hoshiya
  • Patent number: 8570690
    Abstract: A magnetic sensor having a novel hard bias structure that provides reduced gap spacing for increased data density. The magnetic sensor includes a sensor stack with first and second sides formed on a magnetic shield. A thin insulation layer is formed over the sides of the sensor stack and over the bottom shield. An under-layer comprising Cu—O is formed over the insulation layer and a hard magnetic bias layer is formed over the under-layer. The use of Cu—O as the under-layer allows the under-layer to be made thinner while still maintaining excellent magnetic properties in the hard bias layers formed there-over. This reduced thickness of the under-layer allows the gap spacing (spacing between the top and bottom magnetic shields) to be reduced, which in turn provides increased data density.
    Type: Grant
    Filed: June 20, 2011
    Date of Patent: October 29, 2013
    Assignee: HGST Netherlands B.V.
    Inventors: Susumu Okamura, Hiroyuki Hoshiya, Takahiro Ibusuki
  • Patent number: 8564282
    Abstract: There is provided an angle sensor and angle detection device of high output and high accuracy with a wide operating temperature range. First through eighth sensor units 511, 522, 523, 514, 531, 542, 543 and 534 are produced from spin valve magnetoresistive films that use a self-pinned type ferromagnetic pinned layer comprising two layers of ferromagnetic films that are strongly and anti-ferromagnetically coupled. The respective sensor units are produced via the formation and patterning of thin-films magnetized at angles that differ by 90°, and the formation of insulation films. By using, for the ferromagnetic films, CoFe and FeCo films that have similar Curie temperatures to make the difference in magnetization amount be zero, high immunity to external magnetic fields, a broad adaptive temperature range, and high output are realized.
    Type: Grant
    Filed: December 3, 2008
    Date of Patent: October 22, 2013
    Assignee: Hitachi Metals, Ltd.
    Inventors: Hiroyuki Hoshiya, Kenichi Meguroo, Kazuhiro Nakamoto, Yasunori Abe
  • Patent number: 8547666
    Abstract: Embodiments of the present invention aim suppress the generation of spin torque noise in a current perpendicular to plane magnetoresistive head. According to one embodiment, when sensing current is applied to a current perpendicular to plane magnetoresistive head from a free layer toward a first pinned layer, a configuration wherein the relative angle between the magnetization of a second pinned layer and the magnetization of the free layer is in the range of 70 to 80 degrees is used. Further, when sensing current is applied to a current perpendicular to plane magnetoresistive head from a first pinned layer toward a free layer, a configuration wherein the relative angle between the magnetization of a second pinned layer and the magnetization of the free layer is in the range of 100 to 110 degrees is used.
    Type: Grant
    Filed: August 3, 2007
    Date of Patent: October 1, 2013
    Assignee: HGST Netherlands BV
    Inventors: Hiroyuki Katada, Hiroyuki Hoshiya
  • Patent number: 8514527
    Abstract: According to one embodiment, a magnetoresistive effect head includes a magnetically pinned layer having a direction of magnetization that is pinned, a free magnetic layer positioned above the magnetically pinned layer, the free magnetic layer having a direction of magnetization that is free to vary, and a barrier layer comprising an insulator positioned between the magnetically pinned layer and the free magnetic layer, wherein at least one of the magnetically pinned layer and the free magnetic layer has a layered structure, the layered structure including a crystal layer comprising one of: a CoFe magnetic layer or a CoFeB magnetic layer and an amorphous magnetic layer comprising CoFeB and an element selected from: Ta, Hf, Zr, and Nb, wherein the crystal layer is positioned closer to a tunnel barrier layer than the amorphous magnetic layer. In another embodiment, a magnetic data storage system includes the magnetoresistive effect head described above.
    Type: Grant
    Filed: November 29, 2010
    Date of Patent: August 20, 2013
    Assignee: HGST Netherlands B.V.
    Inventors: Kojiro Komagaki, Katsumi Hoshino, Masashige Sato, Hiroyuki Hoshiya
  • Patent number: 8351153
    Abstract: According to one embodiment, a magnetic recording head includes a main pole having a throat height portion and a flare portion that is connected to the throat height portion, the flare portion gradually being expanded in width to an upper part in an element height direction. The head also includes a sub pole, magnetic shields disposed via a nonmagnetic layer on a trailing side of the main pole and on both sides in a track width direction of the main pole, and a coil for generating a recording magnetic field from the main pole. The nonmagnetic layer has an upper portion of which the thickness is increased stepwise or in a tapered manner in the element height direction with respect to an ABS side, and each portion of the magnetic shields adjacent to the main pole has a shape corresponding to a surface shape of the nonmagnetic layer.
    Type: Grant
    Filed: September 14, 2009
    Date of Patent: January 8, 2013
    Assignee: Hitachi Global Storage Technologies Netherlands B.V.
    Inventors: Isao Nunokawa, Mikito Sugiyama, Kikuo Kusukawa, Hiroyuki Hoshiya
  • Publication number: 20120320473
    Abstract: A magnetic sensor having a novel hard bias structure that provides reduced gap spacing for increased data density. The magnetic sensor includes a sensor stack with first and second sides formed on a magnetic shield. A thin insulation layer is formed over the sides of the sensor stack and over the bottom shield. An under-layer comprising Cu—O is formed over the insulation layer and a hard magnetic bias layer is formed over the under-layer. The use of Cu—O as the under-layer allows the under-layer to be made thinner while still maintaining excellent magnetic properties in the hard bias layers formed thereover. This reduced thickness of the under-layer allows the gap spacing (spacing between the top and bottom magnetic shields) to be reduced, which in turn provides increased data density.
    Type: Application
    Filed: June 20, 2011
    Publication date: December 20, 2012
    Applicant: Hitachi Global Storage Technologies Netherlands B.V.
    Inventors: Susumu Okamura, Hiroyuki Hoshiya, Takahiro Ibusuki
  • Patent number: 8223464
    Abstract: In one embodiment, a differential-type magnetic read head includes a differential-type magneto-resistive-effect film formed on a substrate, and a pair of electrodes for applying current in a direction perpendicular to a film plane of the film. The film includes a first and second stacked film, each having a pinned layer, an intermediate layer, and a free layer, with the second stacked film being formed on the first stacked film. A side face in a track width direction of the film is shaped to have an inflection point at an intermediate position in a thickness direction of the film, and the side face is shaped to be approximately vertical to the substrate in an upward direction of the substrate from the inflection point. Also, the side face is shaped to be gradually increased in track width as approaching the substrate in a downward direction of the substrate from the inflection point.
    Type: Grant
    Filed: November 9, 2009
    Date of Patent: July 17, 2012
    Assignee: Hitachi Global Storage Technologies Netherlands B.V.
    Inventors: Kan Yasui, Masato Shiimoto, Takeshi Nakagawa, Hiroyuki Katada, Nobuo Yoshida, Hiroyuki Hoshiya
  • Patent number: 8223463
    Abstract: A magnetoresistive head which has a high head SNR by reducing generated mag-noise without deteriorating an output comprises, according to one embodiment, a magnetoresistive sensor having a laminated structure which includes an antiferromagnetic layer, a magnetization pinned layer, a non-magnetic intermediate layer, a magnetization free layer, and a magnetization stable layer arranged adjacent to the magnetization free layer. The magnetization stable layer comprises non-magnetic coupling layer, a first ferromagnetic stable layer, an antiparallel coupling layer, and a second ferromagnetic stable layer. A magnetization quantity of a first ferromagnetic stable layer and a second ferromagnetic stable layer are substantially equal, and the magnetization of the first ferromagnetic stable layer and the second ferromagnetic stable layer are magnetically coupled in the antiparallel direction from each other.
    Type: Grant
    Filed: October 15, 2009
    Date of Patent: July 17, 2012
    Assignee: Hitachi Global Storage Technologies Netherlands B.V.
    Inventors: Hiroyuki Katada, Masato Shiimoto, Hiroyuki Hoshiya