Patents by Inventor Kazuhiko Hayashi

Kazuhiko Hayashi 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: 6791794
    Abstract: By inserting a first antistripping layer comprising a first non-magnetic layer 22 and a first conductive layer 23 between a first magnetic layer 16 and a magnetic separation layer 13, adhesion between the first conductive layer 23 and the magnetic separation layer 13 is improved to prevent the first magnetic layer 16 from stripping. In addition, by inserting a second antistripping layer comprising a second non-magnetic layer 24 and a second conductive layer 25 between a second magnetic layer 21 and a magnetic gap layer 17, adhesion between the second conductive layer 24 and the magnetic gap layer 17 is improved to prevent the second magnetic layer 25 from stripping.
    Type: Grant
    Filed: April 1, 2002
    Date of Patent: September 14, 2004
    Assignee: NEC Corporation
    Inventors: Hiroaki Honjo, Tsutomu Ishi, Mikiko Saito, Shinsaku Saito, Tamaki Toba, Yoshihino Nonaka, Kazuhiko Hayashi, Nobuyuki Ishiwata
  • Publication number: 20040174641
    Abstract: A magneto-resistance effect head is provided with a lower conductive layer which is provided with a recessed portion, and a vertical bias layer is provided in the recessed portion. A free layer is provided on the lower conductive layer. On the free layer, layered in the following order are the non-magnetic layer, the fixed layer, the fixing layer, and the upper layer so as not to be placed immediately above the vertical bias layer. The non-magnetic layer, the fixed layer, the fixing layer, and the upper layer are buried in an insulation layer. Furthermore, an upper conductive layer is provided on the upper layer and the insulation layer. In the direction of the magnetic field applied by the vertical bias layer, the free layer is made greater in length than the fixed layer and the free layer is disposed in proximity to the vertical bias layer with the distance between the fixed layer and the vertical bias layer remaining unchanged.
    Type: Application
    Filed: March 18, 2004
    Publication date: September 9, 2004
    Inventors: Kazuhiko Hayashi, Junichi Fujikata, Tsutomu Ishi, Shigeru Mori, Keishi Ohashi, Masafumi Nakada, Kiyokasu Nagahara, Kunihiko Ishihara, Nobuyuki Ishiwata
  • Patent number: 6775110
    Abstract: A magnetoresistance effect device has the basic structure of substrate/sublayer/NiFe layer/CoFe layer/non-magnetic layer/fixed magnetic layer/antiferromagnetic layer. The sublayer may be Ta at a film thickness of not less than 0.2 nm but less than 3.0 nm, or Hf at a film thickness of not less than 0.2 nm but not greater than 1.5 nm, or Zr at a film thickness of not less than 0.2 nm but not greater than 2.5 nm. It is permissible to use only an NiFe layer instead of the NiFe layer/CoFe layer.
    Type: Grant
    Filed: May 12, 1998
    Date of Patent: August 10, 2004
    Assignee: TDK Corporation
    Inventors: Kazuhiko Hayashi, Shigeru Mori, Masafumi Nakada
  • Patent number: 6747853
    Abstract: A magneto-resistance effect head is provided with a lower conductive layer which is provided with a recessed portion, and a vertical bias layer is provided in the recessed portion. A free layer is provided on the lower conductive layer. On the free layer, layered in the following order are the non-magnetic layer, the fixed layer, the fixing layer, and the upper layer so as not to be placed immediately above the vertical bias layer. The non-magnetic layer, the fixed layer, the fixing layer, and the upper layer are buried in an insulation layer. Furthermore, an upper conductive layer is provided on the upper layer and the insulation layer. In the direction of the magnetic field applied by the vertical bias layer, the free layer is made greater in length than the fixed layer and the free layer is disposed in proximity to the vertical bias layer with the distance between the fixed layer and the vertical bias layer remaining unchanged.
    Type: Grant
    Filed: May 21, 2003
    Date of Patent: June 8, 2004
    Assignee: NEC Corporation
    Inventors: Kazuhiko Hayashi, Junichi Fujikata, Tsutomu Ishi, Shigeru Mori, Keishi Ohashi, Masafumi Nakada, Kiyokazu Nagahara, Kunihiko Ishihara, Nobuyuki Ishiwata
  • Patent number: 6724585
    Abstract: The present invention provides a magnetoresistive device including a multi-layered structure of a free magnetic layer, a non-magnetic non-conductive layer in contact with the free magnetic layer, a pinned layer in contact with the non-magnetic non-conductive layer, and a pinning layer in contact with the pinned layer for pinning a magnetization direction of the pinned layer, wherein at least any one of the free magnetic layer and the pinned layer has an interface region abutting the non-magnetic non-conductive layer, and at least a part of the interface region includes at least one material selected from the group consisting of CoFeB, CoZrMo, CoZrNb, CoZr, CoZrTa, CoHf, CoTa, CoTaHf, CoFeTi, CoNbHf, CoHfPd, CoTaZrNb, and CoZrMoNi.
    Type: Grant
    Filed: September 20, 1999
    Date of Patent: April 20, 2004
    Assignee: NEC Corporation
    Inventor: Kazuhiko Hayashi
  • Patent number: 6718621
    Abstract: In a production process of an MR head using the tunnel junction film basically consisting of a free layer, a barrier layer, and a pinned layer, the resistance between the free layer and the pined layer reduced beforehand and increased afterward up to a resistance value necessary when actually used. While the resistance between the free layer and the pinned layer is low, current can easily flow, suppressing charge up, thus preventing insulation destruction of the barrier layer. This significantly increases a production yield of a recording/reproduction head using a ferromagnetic tunnel junction element.
    Type: Grant
    Filed: May 9, 2000
    Date of Patent: April 13, 2004
    Assignee: NEC Corporation
    Inventors: Kazuhiko Hayashi, Keishi Ohashi, Nobuyuki Ishiwata, Masafumi Nakada, Eizo Fukami, Kiyokazu Nagahara, Hiroaki Honjo, Shinsaku Saitoh
  • Publication number: 20040065877
    Abstract: An organic EL device having a light emitting element including a first electrode (2), a second electrode (4) of transparent conductive film, and a light emitting organic material layer (9) formed between said first electrode (2) and said second electrode (4), wherein said transparent conductive film is made of a metal oxide deficient in oxygen as compared with stoichiometric composition. Since the transparent conductive film (4) directly in contact with the light emitting organic material layer (9) over a wide area is made of the metal oxide deficient in oxygen as compared with stoichiometric composition, the transparent conductive film can absorb moisture and oxygen which may possibly absorbed by the light emitting organic material layer so that the light emitting organic material layer is prevented from deteriorating, and the long emission lifetime of the element can be ensured.
    Type: Application
    Filed: August 8, 2003
    Publication date: April 8, 2004
    Inventors: Kazuhiko Hayashi, Atsushi Oda, Takeshi Fukuchi, Shinnzo Tsuboi
  • Patent number: 6714374
    Abstract: A magnetoresistive sensor includes a magnetoresistive element and equipment which generates a magnetic field in the magnetoresistive element thereby inducing a biasing magnetic field in the element, where the magnetoresistive element comprises a high electron mobility semiconductor and electrodes which are connected to the semiconductor. If it is an insulator, the equipment, which generates the biasing magnetic field and supplies it to the magnetoresistive element, may contact directly to the magnetoresistive element. If it is a conductor, an insulating separation layer must be set between the equipment and the element. A magnetoresistive element is representatively Corbino disk type or a bar type magnetoresistive element. Another candidate of the magnetoresistive element is an element consisting of a high electron mobility semiconductor, a pair of electrodes which make a current path in the high electron mobility semiconductor, and another pair of electrodes to detect the induced voltage by the current.
    Type: Grant
    Filed: August 31, 2000
    Date of Patent: March 30, 2004
    Assignee: NEC Corporation
    Inventors: Kazuhiko Hayashi, Keishi Ohashi, Stuart Solin, Tao Zhou
  • Publication number: 20040024269
    Abstract: It is to provide a process for synthesizing an intended fluorine-containing compound having a geminal difluoro structure with a high yield, by subjecting a carbonyl compound which is readily available to a two-stage reaction.
    Type: Application
    Filed: July 30, 2003
    Publication date: February 5, 2004
    Applicant: ASAHI GLASS COMPANY LIMITED
    Inventors: Shuzhong Wang, Kazuhiko Hayashi, Shinsuke Kaga, Kazuya Oharu
  • Patent number: 6682175
    Abstract: In an ink jet recording head, an ink pool has a main flow path communicating with an ink supply port and a plurality of branch flow paths branching from the main flow path. Each ejector has a pressure chamber, a pressure generating unit and a nozzle. The pressure chamber communicates with the corresponding one of the branch flow paths. The pressure generating unit generates a pressure wave in ink charged into the pressure chamber. The nozzle ejects the ink from the pressure chamber compressed by the pressure wave. At least one wall surface forming each of the branch flow paths is formed of a damper member elastically deformable in accordance with the change of pressure in the branch flow path.
    Type: Grant
    Filed: August 29, 2002
    Date of Patent: January 27, 2004
    Assignee: Fuji Xerox Co., Ltd.
    Inventors: Yasuhiro Otsuka, Kazuhiko Hayashi, Toshinori Ishiyama, Masakazu Okuda
  • Patent number: 6674615
    Abstract: A magneto-resistance effect head (MR head) is provided, wherein a lower electrode-cum-magnetic shield layer is provided on a substrate, a magnetic gap adjusting layer is provided thereon, a magneto-resistance effect element (MR element) is provided on the magnetic gap adjusting layer, and an upper electrode-cum-magnetic shield layer is provided on the MR element. A pair of vertical bias layers is provided at both sides of the MR element. In the MR element, a lower layer, a free magnetic layer, a nonmagnetic layer, a fixed magnetic layer, and a fixing layer are provided in order from the magnetic gap adjusting layer side. By providing the magnetic gap adjusting layer between the lower electrode-cum-magnetic shield layer and the free magnetic layer, the free magnetic layer can be made to be sufficiently separate from the lower electrode-cum-magnetic shield layer. Thereby, since a sufficient leak magnetic field can be applied to the free magnetic layer, the head reproduction output is improved.
    Type: Grant
    Filed: December 13, 2000
    Date of Patent: January 6, 2004
    Assignee: NEC Corporation
    Inventor: Kazuhiko Hayashi
  • Patent number: 6664784
    Abstract: There is provided a magneto-resistive sensor including (a) a multi-layered structure including a base layer, a magnetic layer, and a non-magnetic layer, the magnetic and non-magnetic layers being deposited on or above the base layer, the multi-layered structure having a sense region therein, and (b) a pair of electrode layers electrically connected to the sense region at its opposite sides, the electrode layers leading a sense current into the sense region at one side thereof and leading the sense current out of the sense region through the other side thereof, the magneto-resistive sensor detecting a magnetic field in accordance with fluctuation in a resistance in the sense region, the base layer being composed of zirconium (Zr) or alloy thereof. The magneto-resistive sensor makes it possible to provide a magneto-resistive layer having crystallinity superior to almost the same degree as crystallinity obtained when a base layer is composed of Ta, and to ensure a high resistance-change ratio.
    Type: Grant
    Filed: November 24, 1999
    Date of Patent: December 16, 2003
    Assignee: NEC Corporation
    Inventor: Kazuhiko Hayashi
  • Patent number: 6665153
    Abstract: A MR element is provided, which allows the sense current to flow through only the inner region of a MR layer to bypass its end regions, thereby realizing high magnetic sensitivity and good domain control in the sensing region.
    Type: Grant
    Filed: July 27, 2000
    Date of Patent: December 16, 2003
    Assignee: TDK Corporation
    Inventor: Kazuhiko Hayashi
  • Publication number: 20030211176
    Abstract: A sugar decomposition inhibitor, a maltase activity inhibitor, a glucoamylase activity inhibitor, a sucrase activity inhibitor and an isomaltase activity inhibitor comprising as an effective component a hot-water extract of banaba, a synthetic resin adsorption fraction of said hot-water extract, or a mixture thereof are provided. Further, an insulin secretion controller comprising as an effective component a hot-water extract of banaba is also provided. In addition, a healthy food and beverage comprising a hot-water extract of banaba, a synthetic resin adsorption fraction of said hot-water extract or a mixture thereof and sugar except for monosaccharides are provided.
    Type: Application
    Filed: June 16, 2003
    Publication date: November 13, 2003
    Applicant: ITO EN, LTD.
    Inventors: Yuko Suzuki, Kazuhiko Hayashi, Iwao Sakane, Takami Kakuda
  • Publication number: 20030193762
    Abstract: A magneto-resistance effect head is provided with a lower conductive layer which is provided with a recessed portion, and a vertical bias layer is provided in the recessed portion. A free layer is provided on the lower conductive layer. On the free layer, layered in the following order are the non-magnetic layer, the fixed layer, the fixing layer, and the upper layer so as not to be placed immediately above the vertical bias layer. The non-magnetic layer, the fixed layer, the fixing layer, and the upper layer are buried in an insulation layer. Furthermore, an upper conductive layer is provided on the upper layer and the insulation layer. In the direction of the magnetic field applied by the vertical bias layer, the free layer is made greater in length than the fixed layer and the free layer is disposed in proximity to the vertical bias layer with the distance between the fixed layer and the vertical bias layer remaining unchanged.
    Type: Application
    Filed: May 21, 2003
    Publication date: October 16, 2003
    Inventors: Kazuhiko Hayashi, Junichi Fujikata, Tsutomu Ishi, Shigeru Mori, Keishi Ohashi, Masafumi Nakada, Kiyokazu Nagahara, Kunihiko Ishihara, Nobuyuki Ishiwata
  • Publication number: 20030193759
    Abstract: A magnetoresistance effect device having a basic structure wherein a multi-layer film comprising a unit of magnetic layer/non-magnetic layer/magnetic layer/antiferromagnetic layer, or antiferromagnetic layer/magnetic layer/non-magnetic layer/magnetic layer is formed with a protective film on a surface of the magnetoresistance effect device employing one of a metal, oxide material, nitride material, a mixture of oxide and nitride material, a double-layer film of metal/oxide, a double-layer film of metal/nitride, or a double-layer film of metal/(mixture of oxide and nitride) of film thickness between 2 nm and 7 nm.
    Type: Application
    Filed: June 6, 2003
    Publication date: October 16, 2003
    Applicant: TDK CORPORATION
    Inventor: Kazuhiko Hayashi
  • Patent number: 6628086
    Abstract: An organic electroluminescence device is provided which is capable of providing light emission lasting time that can be practically used, that is, of improving its light emission life. A light emitting body used in the organic electroluminescence device is made up of a lower electrode layer, a light emitting layer and a transparent electrode layer being stacked in order on a substrate. As a material for the transparent electrode layer, a substance “In2-xSnxO3-y” being a mixture of an oxide of indium with tin is employed as its chief component. A material having hygroscopicity is formed adjacent to the transparent electrode layer. Light emitting element portion made up of the electrode and light emitting material layer is the electroluminescence device.
    Type: Grant
    Filed: February 27, 2002
    Date of Patent: September 30, 2003
    Assignee: NEC Corporation
    Inventors: Kazuhiko Hayashi, Takashi Fukuchi, Shinzo Tsuboi, Ichiro Fujieda
  • Patent number: 6624987
    Abstract: A magnetoresistive effect head which is easy to manufacture and in which a sense current is prevented from bypassing a barrier layer is provided. Also provided are a method for manufacturing the head and a magnetic recording apparatus utilizing the head. This magnetoresistive effect head utilizes an MTJ film which comprises, for forming its basic structure, a free layer, a barrier layer, a pinned layer and a pinning layer, wherein an oxide or a nitride layer is formed by oxidizing or nitriding metallic materials constituting the pinned layer and pinning layer.
    Type: Grant
    Filed: May 31, 2000
    Date of Patent: September 23, 2003
    Assignee: NEC Corporation
    Inventors: Kazuhiko Hayashi, Keishi Ohashi, Nobuyuki Ishiwata, Masafumi Nakada, Eizo Fukami, Kiyokazu Nagahara, Hiroaki Honjou, Shinsaku Saitoh
  • Publication number: 20030162870
    Abstract: A flame-retardant resin composition is disclosed. The composition comprises (A) 100 parts by weight of a synthetic resin, (B) 0.5 to 30 parts by weight of a phosphoric ester flame retardant, (C) 0.005 to 5 parts by weight of an organic phosphoric ester metal salt and (D) 0.05 to 5 parts by weight of an anti-dripping agent.
    Type: Application
    Filed: October 17, 2002
    Publication date: August 28, 2003
    Applicant: ASAHI DENKA CO., LTD.
    Inventors: Ryoji Kimura, Tetsuo Kamimoto, Kazuhiko Hayashi, Hideaki Yukutake, Takeshi Nishiyama
  • Publication number: 20030151859
    Abstract: A magnetoresistive effect element which is easy to manufacture and in which a sense current is prevented from bypassing a barrier layer is provided. Also provided are a method for manufacturing the element and a magnetic recording apparatus utilizing the element. This magnetoresistive effect element utilizes an MTJ film which comprises, for forming its basic structure, a free layer, a barrier layer, a pinned layer and a pinning layer, wherein an oxide or a nitride layer is formed by oxidizing or nitriding metallic materials constituting the pinned layer and pinning layer.
    Type: Application
    Filed: February 3, 2003
    Publication date: August 14, 2003
    Applicant: NEC CORPORATION
    Inventors: Kazuhiko Hayashi, Keishi Ohashi, Nobuyuki Ishiwata, Masafumi Nakada, Eizo Fukami, Kiyokazu Nagahara, Hiroaki Honjou, Shinsaku Saitoh