Patents by Inventor Toshihiko Nagase

Toshihiko Nagase 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: 20180076262
    Abstract: According to one embodiment, a semiconductor device includes a first rare earth oxide layer, a first magnetic layer being adjacent to the first rare earth oxide layer, and a nonmagnetic layer, the first magnetic layer being disposed between the first rare earth oxide layer and the nonmagnetic layer and being oriented in a crystal surface which is the same as a crystal surface of the nonmagnetic layer.
    Type: Application
    Filed: February 28, 2017
    Publication date: March 15, 2018
    Applicant: TOSHIBA MEMORY CORPORATION
    Inventors: Youngmin EEH, Toshihiko NAGASE, Daisuke WATANABE, Kazuya SAWADA, Kenichi YOSHINO, Tadaaki OIKAWA, Hiroyuki OHTORI
  • Publication number: 20180075895
    Abstract: According to one embodiment, a memory device includes: a magnetoresistive element including first and second magnetic layers and a non-magnetic layer provided between the first and second magnetic layers; and a write circuit which controls a first writing setting magnetization of the first and second magnetic layers in a parallel state and a second writing setting the magnetization of the first and second magnetic layers in an antiparallel state, and applies a current pulse to the magnetoresistive element. A first pulse pattern used in the first writing is different from a second pulse pattern used in the second writing.
    Type: Application
    Filed: March 10, 2017
    Publication date: March 15, 2018
    Applicant: TOSHIBA MEMORY CORPORATION
    Inventors: Tatsuya KISHI, Tsuneo INABA, Daisuke WATANABE, Masahiko NAKAYAMA, Nobuyuki OGATA, Masaru TOKO, Hisanori AIKAWA, Jyunichi OZEKI, Toshihiko NAGASE, Young Min EEH, Kazuya SAWADA
  • Patent number: 9780298
    Abstract: According to one embodiment, a magnetoresistive element includes a recording layer having a variable magnetization direction, a reference layer having an invariable magnetization direction, an intermediate layer provided between the recording layer and the reference layer, and a first buffer layer provided on a surface of the recording layer, which is opposite to a surface of the recording layer where the intermediate layer is provided. The recording layer comprises a first magnetic layer which is provided in a side of the intermediate layer and contains CoFe as a main component, and a second magnetic layer which is provided in a side of the first buffer layer and contains CoFe as a main component, a concentration of Fe in the first magnetic layer being higher than a concentration of Fe in the second magnetic layer. The first buffer layer comprises a nitrogen compound.
    Type: Grant
    Filed: September 18, 2015
    Date of Patent: October 3, 2017
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Eiji Kitagawa, Tadaomi Daibou, Tadashi Kai, Toshihiko Nagase, Kenji Noma, Hiroaki Yoda
  • Publication number: 20170263857
    Abstract: According to one embodiment, a magnetoresistive memory device includes a first magnetic layer in which a magnetization direction is variable, a first nonmagnetic layer provided on the first magnetic layer, a second magnetic layer provided on the first nonmagnetic layer, a magnetization direction of the second magnetic layer being invariable, and a second nonmagnetic layer provided on the first magnetic layer, which is opposite the first nonmagnetic layer. The first magnetic layer includes Mo.
    Type: Application
    Filed: September 16, 2016
    Publication date: September 14, 2017
    Applicant: KABUSHIKI KAISHA TOSHIBA
    Inventors: Daisuke WATANABE, Toshihiko NAGASE, Youngmin EEH, Kazuya SAWADA, Makoto NAGAMINE, Tadaaki OIKAWA, Kenichi YOSHINO, Hiroyuki OHTORI
  • Publication number: 20170263855
    Abstract: According to one embodiment, a magnetic storage device includes a substrate, a dummy contact disposed on a top surface of the substrate, extending linearly in a direction substantially perpendicular to the top surface of the substrate, and floating electrically, and a magnetoresistive effect element included in a layer and insulated from the dummy contact, wherein the layer is disposed on the top surface of the dummy contact.
    Type: Application
    Filed: September 9, 2016
    Publication date: September 14, 2017
    Applicant: KABUSHIKI KAISHA TOSHIBA
    Inventors: Makoto NAGAMINE, Young Min EEH, Daisuke WATANABE, Kazuya SAWADA, Toshihiko NAGASE
  • Publication number: 20170263858
    Abstract: According to one embodiment, a magnetic memory device includes a stacked structure including a first magnetic layer, a second magnetic layer and a nonmagnetic layer between the first magnetic layer and the second magnetic layer, and a sidewall insulating layer provided on a side surface of the stacked structure and containing boron (B).
    Type: Application
    Filed: September 16, 2016
    Publication date: September 14, 2017
    Applicant: KABUSHIKI KAISHA TOSHIBA
    Inventors: Yasuyuki SONODA, Daisuke WATANABE, Masatoshi YOSHIKAWA, Youngmin EEH, Shuichi TSUBATA, Toshihiko NAGASE, Yutaka HASHIMOTO, Kazuya SAWADA, Kazuhiro TOMIOKA, Kenichi YOSHINO, Tadaaki OIKAWA
  • Publication number: 20170263676
    Abstract: According to one embodiment, a magnetoresistive element includes a first metal layer having a body-centered cubic structure, a second metal layer having a hexagonal close-packed structure on the first metal layer, a metal nitride layer on the second metal layer, a first magnetic layer on the metal nitride layer, an insulating layer on the first magnetic layer, and a second magnetic layer on the insulating layer.
    Type: Application
    Filed: September 9, 2016
    Publication date: September 14, 2017
    Applicant: KABUSHIKI KAISHA TOSHIBA
    Inventors: Youngmin EEH, Toshihiko NAGASE, Daisuke WATANABE, Koji UEDA, Makoto NAGAMINE, Kazuya SAWADA
  • Publication number: 20170263680
    Abstract: According to one embodiment, a magnetoresistive memory device includes an electrode, a first layer which is provided on the electrode and includes an amorphous portion in at least a part of an electrode side, and a magnetoresisive element provided on the first layer.
    Type: Application
    Filed: September 16, 2016
    Publication date: September 14, 2017
    Applicants: KABUSHIKI KAISHA TOSHIBA, SK HYNIX INC.
    Inventors: Kenichi YOSHINO, Toshihiko NAGASE, Youngmin EEH, Daisuke WATANABE, Kazuya SAWADA, Makoto NAGAMINE, Won Joon CHOI, Guk Cheon KIM, Yang Kon KIM, Jong Koo LIM
  • Patent number: 9741928
    Abstract: According to one embodiment, a magnetoresistive element comprises a first magnetic layer, a second magnetic layer, a first nonmagnetic layer, a second nonmagnetic layer, and a third magnetic layer. The first magnetic layer has a variable magnetization direction. The second magnetic layer has an invariable magnetization direction and includes a nonmagnetic material film and a magnetic material film. The first nonmagnetic layer is arranged between the first magnetic layer and the second magnetic layer. The second nonmagnetic layer is arranged on a surface of the second magnetic layer. The third magnetic layer is arranged on a surface of the second nonmagnetic layer. The second nonmagnetic layer is in contact with the nonmagnetic material film included in the second magnetic layer.
    Type: Grant
    Filed: February 11, 2016
    Date of Patent: August 22, 2017
    Assignee: KABUSHIKI KAISHA TOSHIBA
    Inventors: Koji Ueda, Toshihiko Nagase, Kazuya Sawada, Youngmin Eeh, Daisuke Watanabe, Hiroaki Yoda
  • Publication number: 20170222133
    Abstract: Provided are electronic device including a variable resistance element and a method for fabricating an electronic device including a variable resistance element. The electronic device including a variable resistance element includes a free layer formed over a substrate and having a changeable magnetization direction, a pinned layer having a pinned magnetization direction, a tunnel barrier layer interposed between the free layer and the pinned layer, and a magnetic correction layer suitable for reducing the influence of a stray field generated by the pinned layer. The method may include cooling the substrate, before forming the magnetic correction layer such that the magnetic correction layer is formed over the cooled substrate.
    Type: Application
    Filed: June 20, 2016
    Publication date: August 3, 2017
    Inventors: Jong-Koo LIM, Won-Joon CHOI, Guk-Cheon KIM, Yang-Kon KIM, Ku-Youl JUNG, Toshihiko NAGASE, Youngmin EEH, Daisuke WATANABE, Kazuya SAWADA, Makoto NAGAMINE
  • Patent number: 9705076
    Abstract: According to one embodiment, there is provided a magnetoresistive element, including a lower electrode having crystallinity on a substrate, a first conductive layer including an amorphous state on the lower electrode, a buffer layer on the first conductive layer, and an MTJ element on the buffer layer.
    Type: Grant
    Filed: September 5, 2014
    Date of Patent: July 11, 2017
    Assignee: KABUSHIKI KAISHA TOSHIBA
    Inventors: Makoto Nagamine, Youngmin Eeh, Koji Ueda, Daisuke Watanabe, Kazuya Sawada, Toshihiko Nagase, Masahiko Nakayama
  • Patent number: 9640584
    Abstract: According to one embodiment, a magnetoresistive memory device, includes a metal buffer layer provided on a substrate, a crystalline metal nitride buffer layer provided on the metal buffer layer, and a magnetoresistive element provided on the metal nitride buffer layer. The metal nitride buffer layer and the metal buffer layer contain a same material.
    Type: Grant
    Filed: March 11, 2015
    Date of Patent: May 2, 2017
    Assignee: KABUSHIKI KAISHA TOSHIBA
    Inventors: Makoto Nagamine, Youngmin Eeh, Koji Ueda, Daisuke Watanabe, Kazuya Sawada, Toshihiko Nagase
  • Publication number: 20170117459
    Abstract: A magnetoresistive element includes a storage layer as a ferromagnetic layer which has magnetic anisotropy perpendicular to film planes, and in which a magnetization direction is variable, a reference layer as a ferromagnetic layer which has magnetic anisotropy perpendicular to film planes, and in which a magnetization direction is invariable, a tunnel barrier layer as a nonmagnetic layer formed between the storage layer and the reference layer, and a first underlayer formed on a side of the storage layer, which is opposite to a side facing the tunnel barrier layer, and containing amorphous W.
    Type: Application
    Filed: January 3, 2017
    Publication date: April 27, 2017
    Applicant: KABUSHIKI KAISHA TOSHIBA
    Inventors: Daisuke WATANABE, Youngmin EEH, Kazuya SAWADA, Koji UEDA, Toshihiko NAGASE
  • Patent number: 9620561
    Abstract: According to one embodiment, a magnetoresistive element is disclosed. The magnetoresistive element includes an underlayer containing aluminum (Al), nitrogen (N) and X. The X is an element other than Al and N. A first magnetic layer is provided on the underlayer. A nonmagnetic layer is provided on the first magnetic layer. A second magnetic layer is provided on the nonmagnetic layer.
    Type: Grant
    Filed: February 20, 2015
    Date of Patent: April 11, 2017
    Assignee: KABUSHIKI KAISHA TOSHIBA
    Inventors: Toshihiko Nagase, Daisuke Watanabe, Youngmin Eeh, Koji Ueda, Kazuya Sawada, Makoto Nagamine
  • Publication number: 20160380182
    Abstract: According to one embodiment, there is provided a magnetoresistive element, including a first magnetic layer, a nonmagnetic layer on the first magnetic layer, and a second magnetic layer on the nonmagnetic layer, wherein one of the first and second magnetic layers include one of Co and Fe, and a material having a higher standard electrode potential than Co and Fe.
    Type: Application
    Filed: September 12, 2016
    Publication date: December 29, 2016
    Applicants: KABUSHIKI KAISHA TOSHIBA, SK HYNIX INC.
    Inventors: Daisuke WATANABE, Yang Kon KIM, Makoto NAGAMINE, Youngmin EEH, Koji UEDA, Toshihiko NAGASE, Kazuya SAWADA, Guk Cheon KIM, Bo Mi LEE, Won Joon CHOI
  • Patent number: 9529714
    Abstract: An electronic device includes a semiconductor memory, and the semiconductor memory includes a first magnetic layer having a variable magnetization direction; a second magnetic layer having a pinned magnetization direction; and a tunnel barrier layer interposed between the first magnetic layer and the second magnetic layer, wherein the second magnetic layer includes a ferromagnetic material with molybdenum (Mo) added thereto.
    Type: Grant
    Filed: December 3, 2014
    Date of Patent: December 27, 2016
    Assignees: SK Hynix Inc., Kabushiki Kaisha Toshiba
    Inventors: Yang-Kon Kim, Bo-Mi Lee, Won-Joon Choi, Guk-Cheon Kim, Daisuke Watanabe, Makoto Nagamine, Young-Min Eeh, Koji Ueda, Toshihiko Nagase, Kazuya Sawada
  • Publication number: 20160315251
    Abstract: A magnetoresistive element including a first magnetic layer; a first nonmagnetic layer provided on the first magnetic layer, the first nonmagnetic layer formed of SrTiO3, SrFeO3, LaAlO3, NdCoO3, or BN; and a second magnetic layer provided on the first nonmagnetic layer, wherein the first nonmagnetic layer is lattice-matched to the first magnetic layer, and the second magnetic layer is lattice-matched to the first nonmagnetic layer.
    Type: Application
    Filed: June 30, 2016
    Publication date: October 27, 2016
    Applicant: KABUSHIKI KAISHA TOSHIBA
    Inventors: Toshihiko NAGASE, Tadashi KAI, Youngmin EEH, Koji UEDA, Daisuke WATANABE, Kazuya SAWADA, Hiroaki YODA
  • Patent number: 9461240
    Abstract: According to one embodiment, a magnetoresistive memory device includes a first magnetic layer, a second magnetic layer, a nonmagnetic layer provided between the first magnetic layer and the second magnetic layer, and a third magnetic layer provided on a side of the first or second magnetic layer opposite to the nonmagnetic layer. The third magnetic layer has a multilayer film having an artificial lattice structure, and the third magnetic layer is partly microcrystalline or amorphous.
    Type: Grant
    Filed: July 30, 2015
    Date of Patent: October 4, 2016
    Assignee: KABUSHIKI KAISHA TOSHIBA
    Inventors: Kazuya Sawada, Toshihiko Nagase, Youngmin Eeh, Koji Ueda, Daisuke Watanabe, Makoto Nagamine
  • Publication number: 20160254442
    Abstract: According to one embodiment, a magnetoresistive memory device includes a first magnetic layer, a second magnetic layer, a nonmagnetic layer provided between the first magnetic layer and the second magnetic layer, and a third magnetic layer provided on a side of the first or second magnetic layer opposite to the nonmagnetic layer. The third magnetic layer has a multilayer film having an artificial lattice structure, and the third magnetic layer is partly microcrystalline or amorphous.
    Type: Application
    Filed: July 30, 2015
    Publication date: September 1, 2016
    Inventors: Kazuya SAWADA, Toshihiko NAGASE, Youngmin EEH, Koji UEDA, Daisuke WATANABE, Makoto NAGAMINE
  • Patent number: 9373776
    Abstract: According to one embodiment, a magnetoresistive element includes first and second magnetic layers and a first nonmagnetic layer. The first magnetic layer has an axis of easy magnetization perpendicular to a film plane, and a variable magnetization. The second magnetic layer has an axis of easy magnetization perpendicular to a film plane, and an invariable magnetization. The first nonmagnetic layer is provided between the first and second magnetic layers. The second magnetic layer includes third and fourth magnetic layers, and a second nonmagnetic layer formed between the third and fourth magnetic layers. The third magnetic layer is in contact with the first nonmagnetic layer and includes Co and at least one of Zr, Nb, Mo, Hf, Ta, and W.
    Type: Grant
    Filed: December 12, 2014
    Date of Patent: June 21, 2016
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Toshihiko Nagase, Eiji Kitagawa, Katsuya Nishiyama, Tadashi Kai, Koji Ueda, Daisuke Watanabe