Patents by Inventor Yoshinori Tokura

Yoshinori Tokura 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: 20190267427
    Abstract: To provide a high-speed, large-scale non-volatile skyrmion random access memory that prevents incorrect writing and incorrect erasure, has a circuit with good storage-data sensitivity, generates smaller leakage current, and consumes less power. To provide a magnetic element for generating and erasing a skyrmion including: a first magnetic material thin film in which the skyrmion is generated and erased; a sensing element for sensing the skyrmion; and at least one of a first transistor for selecting the first magnetic material thin film, and a second transistor for selecting the skyrmion sensing element.
    Type: Application
    Filed: May 20, 2019
    Publication date: August 29, 2019
    Applicant: RIKEN
    Inventors: Yoshio KANEKO, Yoshinori TOKURA
  • Patent number: 10377759
    Abstract: The present invention relates to a compound represented by general formula (I) (wherein, all symbols represent the same meanings as the symbols set forth in the specification), a salt thereof, a solvate thereof, an N-oxide thereof, or a prodrug of any of these. Since the compound has a Brk inhibitory activity, the compound is useful as a drug ingredient for the prevention and/or treatment of Brk-related diseases such as cancer, for example.
    Type: Grant
    Filed: June 21, 2016
    Date of Patent: August 13, 2019
    Assignee: ONO PHARMACEUTICAL CO., LTD.
    Inventors: Shingo Yamamoto, Hiroshi Tokura, Masakuni Kurono, Yoshinori Nomura, Shingo Hotta
  • Publication number: 20190214513
    Abstract: A photoelectric conversion device includes a photoelectric conversion element formed of a polar material and including no p-n junction, and first and second electrodes provided on the photoelectric conversion element and arranged at an interval. Space-inversion symmetry of a structure of the photoelectric conversion element is broken. The first and second electrodes are each formed of a metal material that generates no substantial potential barrier preventing majority carriers for the photoelectric conversion element from moving from the electrode to the photoelectric conversion element.
    Type: Application
    Filed: December 27, 2018
    Publication date: July 11, 2019
    Applicant: RIKEN
    Inventors: Masao NAKAMURA, Masashi KAWASAKI, Yoshinori TOKURA, Naoto NAGAOSA, Takahiro MORIMOTO, Yoshio KANEKO
  • Publication number: 20190115517
    Abstract: The present invention relates to a compound containing at least germanium, tellurium, bismuth and copper as constituent elements, wherein the longest axis of ubiquitous bismuth crystals and copper crystals is less than 2.0 ?m.
    Type: Application
    Filed: March 30, 2017
    Publication date: April 18, 2019
    Applicants: Sumitomo Chemical Company, Limited, Riken
    Inventors: Satoshi SHIMANO, Yasujiro TAGUCHI, Yoshinori TOKURA
  • Publication number: 20190109269
    Abstract: The present invention relates to a compound containing at least germanium, tellurium, bismuth, copper, antimony and silver as constituent elements.
    Type: Application
    Filed: March 30, 2017
    Publication date: April 11, 2019
    Inventors: Satoshi SHIMANO, Yasujiro TAGUCHI, Yoshinori TOKURA
  • Patent number: 10217931
    Abstract: Provided is a magnetic element which can generate a skyrmion by a stacked film including a magnetic layer and a non-magnetic layer, and a skyrmion memory to which the magnetic element is applied and the like. Provided is a magnetic element for generating a skyrmion, the magnetic element comprising a two-dimensional stacked film, wherein the two-dimensional stacked film is at least one or more multiple layered films including a magnetic film and a non-magnetic film stacked on the magnetic film. Also, provided is a skyrmion memory including a plurality of the magnetic elements stacked in a thickness direction.
    Type: Grant
    Filed: March 6, 2017
    Date of Patent: February 26, 2019
    Assignee: RIKEN
    Inventors: Masao Nakamura, Jobu Matsuno, Masashi Kawasaki, Yoshinori Tokura, Yoshio Kaneko
  • Patent number: 10210970
    Abstract: Control of electrical conductivity is provided via electrically conductive magnetic domain walls between magnetic domains. The magnetic domains are identical except for their magnetic configuration. Altering a configuration of the magnetic domains (e.g., by thermal treatment, application of a magnetic field, etc.) can alter the electrical resistance of a device. Such devices can be used as non-volatile information storage devices or as sensors.
    Type: Grant
    Filed: May 20, 2016
    Date of Patent: February 19, 2019
    Assignees: The Board of Trustees of the Leland Stanford Junior University, RIKEN
    Inventors: Yue Ma, Yongtao Cui, Kentaro Ueda, Jun Fujioka, Yoshinori Tokura, Zhixun Shen, Robert B. Laughlin
  • Patent number: 10141068
    Abstract: A magnetic element capable of generating and erasing a skyrmion, including a magnet shaped as a thin layer and including a structure surrounded by a nonmagnetic material; a current path provided surrounding an end region including an end portion of the magnet, on one surface of the magnet; and a skyrmion sensor that detects the generation and erasing of the skyrmion. With Wm being width of the magnet and hm being height of the magnet, a size of the magnet, with the skyrmion of a diameter ? being generated, is such that 2?>Wm>?/2 and 2?>hm>?/2. With W being width of the end region in a direction parallel to the end portion of the magnet and h being height of the end region in a direction perpendicular to the end portion of the magnet, the end region is such that ??W>?/4 and 2?>h>?/2.
    Type: Grant
    Filed: March 1, 2017
    Date of Patent: November 27, 2018
    Assignee: RIKEN
    Inventors: Naoto Nagaosa, Wataru Koshibae, Junichi Iwasaki, Masashi Kawasaki, Yoshinori Tokura, Yoshio Kaneko
  • Patent number: 10049761
    Abstract: To provide a magnetic element which can generate a skyrmion, and a skyrmion memory which applies the magnetic element or the like. To provide a magnetic element with a chiral magnet for generating a skyrmion, the chiral magnet is made of a magnetic material having a ?-Mn type crystal structure. Also, to provide a magnetic element with a chiral magnet for generating a skyrmion, the chiral magnet is made of a magnetic material having an Au4Al type crystal structure.
    Type: Grant
    Filed: March 5, 2017
    Date of Patent: August 14, 2018
    Assignee: RIKEN
    Inventors: Yusuke Tokunaga, Xiuzhen Yu, Yasujiro Taguchi, Yoshinori Tokura, Yoshio Kaneko
  • Patent number: 10008282
    Abstract: To provide a magnetic element which can generate a skyrmion, and a skyrmion memory which applies the magnetic element or the like. To provide a magnetic element with a chiral magnet for generating a skyrmion, the chiral magnet is made of a magnetic material having a ?-Mn type crystal structure. Also, to provide a magnetic element with a chiral magnet for generating a skyrmion, the chiral magnet is made of a magnetic material having an Au4Al type crystal structure.
    Type: Grant
    Filed: March 5, 2017
    Date of Patent: June 26, 2018
    Assignee: RIKEN
    Inventors: Yusuke Tokunaga, Xiuzhen Yu, Yasujiro Taguchi, Yoshinori Tokura, Yoshio Kaneko
  • Publication number: 20180175285
    Abstract: An electronic device is provided, including: a first drive electrode; a second drive electrode that is spaced apart from the first drive electrode; and a topological insulator that contacts both of the first drive electrode and the second drive electrode and has magnetism, wherein the topological insulator includes a first region having a first coercivity and a second region having a second coercivity that is different from the first coercivity. A fabrication method of a topological insulator is also provided, including: preparing a topological insulator having magnetism and a first coercivity; and forming a second region having a second coercivity that is different from the first coercivity by irradiating a partial region of the topological insulator with ions.
    Type: Application
    Filed: February 12, 2018
    Publication date: June 21, 2018
    Inventors: Ryutaro YOSHIMI, Masataka MOGI, Naoto NAGAOSA, Masashi KAWASAKI, Yoshinori TOKURA, Wataru KOSHIBAE
  • Patent number: 10003010
    Abstract: Provided is a magnetic element capable of generating one skyrmion and erasing the one skyrmion. The magnetic element includes a magnet shaped like a substantially rectangular flat plate, an upstream electrode connected to the magnet in a width Wm direction of the magnet and made of a non-magnetic metal, a downstream electrode connected to the magnet in the width Wm direction to oppose the upstream electrode and made of a non-magnetic metal, and a skyrmion sensor configured to detect the skyrmion. Here, a width Wm of the substantially rectangular magnet is such that 3·?>Wm??, where ? denotes a diameter of the skyrmion, a length Hm of the substantially rectangular magnet is such that 2·?>Hm??, and the magnet has a notch structure at the edge between the upstream electrode and the downstream electrode.
    Type: Grant
    Filed: March 3, 2017
    Date of Patent: June 19, 2018
    Assignee: RIKEN
    Inventors: Naoto Nagaosa, Wataru Koshibae, Junichi Iwasaki, Masashi Kawasaki, Yoshinori Tokura, Yoshio Kaneko
  • Patent number: 9859017
    Abstract: To provide a magnetic element capable of performing skyrmion transfer, a skyrmion memory to which this magnetic element is applied, and a shift register, for example, a magnetic element capable of performing skyrmion transfer is provided, the magnetic element providing a transverse transfer arrangement in which the skyrmion is transferred substantially perpendicular to a current between an upstream electrode and a downstream electrode, and including a plurality of stable positions in which the skyrmion exists more stably than in other regions of a magnet, and a skyrmion sensor that detects a position of the skyrmion.
    Type: Grant
    Filed: March 5, 2017
    Date of Patent: January 2, 2018
    Assignee: RIKEN
    Inventors: Naoto Nagaosa, Wataru Koshibae, Junichi Iwasaki, Masashi Kawasaki, Yoshinori Tokura, Yoshio Kaneko
  • Patent number: 9824712
    Abstract: A magnetic storage media which has an endurance (durability) characteristics close to an infinite number of writing times of data and a data retention (holding) characteristics close to permanency, and is ultra-high-speed writable and erasable, and a data storage device and an image storage device which apply this magnetic storage media are provided. A magnetic storage media includes a thin layer magnet and a magnetic field generating unit arranged facing a surface of the magnet, and is capable of creating or eliminating a skyrmion by applying heat energy to another surface of the magnet positioned on the opposite side of the surface of the magnet, and a skyrmion memory includes the magnetic storage media.
    Type: Grant
    Filed: February 3, 2017
    Date of Patent: November 21, 2017
    Assignee: RIKEN
    Inventors: Naoto Nagaosa, Wataru Koshibae, Junichi Iwasaki, Masashi Kawasaki, Yoshinori Tokura, Yoshio Kaneko
  • Patent number: 9748000
    Abstract: Provided is a skyrmion memory circuit capable of circularly transferring a magnetic element skyrmion, comprising one or more current paths in a magnet having a closed-path pattern that are provided surrounding an end region including an end portion of the magnet in a plane of the magnet with the closed-path pattern, and applying current between an outer terminal connected to an outer circumferential portion of the closed-path pattern and an inner circumference electrode connected to an inner circumferential portion of the closed-path pattern, transferring the skyrmion in a direction substantially perpendicular to the direction of the applied current, and circulating the skyrmion in the magnet with the closed-path pattern.
    Type: Grant
    Filed: December 28, 2016
    Date of Patent: August 29, 2017
    Assignee: RIKEN
    Inventors: Naoto Nagaosa, Wataru Koshibae, Junichi Iwasaki, Masashi Kawasaki, Yoshinori Tokura, Yoshio Kaneko
  • Publication number: 20170206921
    Abstract: A magnetic storage media which has an endurance (durability) characteristics close to an infinite number of writing times of data and a data retention (holding) characteristics close to permanency, and is ultra-high-speed writable and erasable, and a data storage device and an image storage device which apply this magnetic storage media are provided. A magnetic storage media includes a thin layer magnet and a magnetic field generating unit arranged facing a surface of the magnet, and is capable of creating or eliminating a skyrmion by applying heat energy to another surface of the magnet positioned on the opposite side of the surface of the magnet, and a skyrmion memory includes the magnetic storage media.
    Type: Application
    Filed: February 3, 2017
    Publication date: July 20, 2017
    Inventors: Naoto NAGAOSA, Wataru KOSHIBAE, Junichi IWASAKI, Masashi KAWASAKI, Yoshinori TOKURA, Yoshio KANEKO
  • Patent number: 9704550
    Abstract: To provide a magnetic element that controls generation and annihilation of a skyrmion. A magnetic element is provided, and the magnetic element comprises: a magnetic body that has a spiral magnetic structure in a stable state; a skyrmion control unit that generates skyrmion in the magnetic body by supplying energy to the magnetic body that has the spiral magnetic structure. Also, the magnetic element in which the skyrmion control unit brings the magnetic body into an unstable state by supplying thermal energy pulses to the magnetic body is provided. Furthermore, a skyrmion memory comprising the magnetic element is provided.
    Type: Grant
    Filed: May 31, 2016
    Date of Patent: July 11, 2017
    Assignee: RIKEN
    Inventors: Hiroshi Oike, Fumitaka Kagawa, Yoshinori Tokura
  • Publication number: 20170178747
    Abstract: To provide a magnetic element which can generate a skyrmion, and a skyrmion memory which applies the magnetic element or the like. To provide a magnetic element with a chiral magnet for generating a skyrmion, the chiral magnet is made of a magnetic material having a ?-Mn type crystal structure. Also, to provide a magnetic element with a chiral magnet for generating a skyrmion, the chiral magnet is made of a magnetic material having an Au4Al type crystal structure.
    Type: Application
    Filed: March 5, 2017
    Publication date: June 22, 2017
    Inventors: Yusuke TOKUNAGA, Xiuzhen YU, Yasujiro TAGUCHI, Yoshinori TOKURA, Yoshio KANEKO
  • Publication number: 20170178746
    Abstract: To provide a magnetic element capable of performing skyrmion transfer, a skyrmion memory to which this magnetic element is applied, and a shift register, for example, a magnetic element capable of performing skyrmion transfer is provided, the magnetic element providing a transverse transfer arrangement in which the skyrmion is transferred substantially perpendicular to a current between an upstream electrode and a downstream electrode, and including a plurality of stable positions in which the skyrmion exists more stably than in other regions of a magnet, and a skyrmion sensor that detects a position of the skyrmion.
    Type: Application
    Filed: March 5, 2017
    Publication date: June 22, 2017
    Inventors: Naoto NAGAOSA, Wataru KOSHIBAE, Junichi IWASAKI, Masashi KAWASAKI, Yoshinori TOKURA, Yoshio KANEKO
  • Publication number: 20170178748
    Abstract: A magnetic element capable of generating and erasing a skyrmion, including a magnet shaped as a thin layer and including a structure surrounded by a nonmagnetic material; a current path provided surrounding an end region including an end portion of the magnet, on one surface of the magnet; and a skyrmion sensor that detects the generation and erasing of the skyrmion. With Wm being width of the magnet and hm being height of the magnet, a size of the magnet, with the skyrmion of a diameter ? being generated, is such that 2?>Wm>?/2 and 2?>hm>?/2. With W being width of the end region in a direction parallel to the end portion of the magnet and h being height of the end region in a direction perpendicular to the end portion of the magnet, the end region is such that ??W>?/4 and 2?>h>?/2.
    Type: Application
    Filed: March 1, 2017
    Publication date: June 22, 2017
    Inventors: Naoto NAGAOSA, Wataru KOSHIBAE, Junichi IWASAKI, Masashi KAWASAKI, Yoshinori TOKURA, Yoshio KANEKO