Patents by Inventor Eiji Komura

Eiji Komura 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: 12048251
    Abstract: Provided is a magnetoresistance effect element that suppresses re-adhesion of impurities during preparation and allows a write current to easily flow. The magnetoresistance effect element includes a first ferromagnetic layer, a second ferromagnetic layer; and a nonmagnetic layer interposed between the first ferromagnetic layer and the second ferromagnetic layer. In the magnetoresistance effect element, the nonmagnetic layer is a tunnel barrier layer constituted by an insulator, a side surface of the first ferromagnetic layer, a side surface of the second ferromagnetic layer and a side surface of the nonmagnetic layer form a continuous inclined surface in any side surface, and a thickness of inside the nonmagnetic layer is thicker than a thickness of outside the nonmagnetic layer.
    Type: Grant
    Filed: June 11, 2021
    Date of Patent: July 23, 2024
    Assignee: TDK CORPORATION
    Inventors: Tomoyuki Sasaki, Yohei Shiokawa, Eiji Komura, Keita Suda
  • Patent number: 11925123
    Abstract: This spin-orbit torque type magnetization rotational element (10) is provided with: a spin-orbit torque wiring (2); a first ferromagnetic layer (1) that is laminated on the spin-orbit torque wiring; a first nonmagnetic metal layer (3) and a second nonmagnetic metal layer (4) that are connected to the spin-orbit torque wiring at positions flanking the first ferromagnetic layer in a plan view from the second direction, and a first insulating layer (31) surrounding the spin-orbit torque wiring, wherein the gravity center (G) of the first ferromagnetic layer is positioned on a side closer to the first nonmagnetic metal layer or the second nonmagnetic metal layer than is a reference point (S) located at the center between the first and second nonmagnetic metal layers in the first direction, and the first insulating layer is any one selected from the group consisting of silicon nitride, aluminum nitride, aluminum oxide, and magnesium oxide.
    Type: Grant
    Filed: November 1, 2021
    Date of Patent: March 5, 2024
    Assignee: TDK CORPORATION
    Inventors: Eiji Komura, Tomoyuki Sasaki
  • Patent number: 11805706
    Abstract: A magnetoresistance effect element includes: a laminate body including a first ferromagnetic layer, a second ferromagnetic layer, and a non-magnetic layer located between the first ferromagnetic layer and the second ferromagnetic layer; and a spin-orbit torque wiring connected to the laminate body. A second surface opposite to a first surface of the spin-orbit torque wiring in contact with the laminate body is curved in a first direction orthogonal to a direction in which the laminate body is laminated.
    Type: Grant
    Filed: March 4, 2021
    Date of Patent: October 31, 2023
    Assignee: TDK CORPORATION
    Inventor: Eiji Komura
  • Patent number: 11769613
    Abstract: A thermistor element includes: a thermistor film; a first electrode provided in contact with one surface of the thermistor film; and a pair of second electrodes provided in contact with an other surface of the thermistor film, wherein the thermistor film is provided to cover a periphery of the first electrode.
    Type: Grant
    Filed: December 1, 2021
    Date of Patent: September 26, 2023
    Assignee: TDK CORPORATION
    Inventors: Susumu Aoki, Shinji Hara, Naoki Ohta, Maiko Shirokawa, Eiji Komura
  • Patent number: 11668607
    Abstract: A thermistor element includes a thermistor film, a first electrode provided in contact with one surface of the thermistor film, and a pair of second electrodes provided in contact with the other surface of the thermistor film, wherein the thermistor film includes an oxide having a spinel crystal structure and having a [111] preferred orientation in a film thickness direction.
    Type: Grant
    Filed: December 1, 2021
    Date of Patent: June 6, 2023
    Assignee: TDK CORPORATION
    Inventors: Maiko Shirokawa, Shinji Hara, Naoki Ohta, Susumu Aoki, Eiji Komura
  • Patent number: 11573122
    Abstract: A resistive element array circuit includes word lines, bit lines, resistive elements, a selector, a differential amplifier, and a ground terminal. The word lines are coupled to a power supply. The resistive elements are each disposed at an intersection of corresponding one of the word lines and corresponding one of the bit lines. The selector is configured to select one word line and one bit line. The differential amplifier includes a positive input terminal configured to be coupled to the selected one of the bit lines which is selected by the selector, a negative input terminal configured to be coupled to non-selected one of the bit lines which is not selected by the selector and to non-selected one of the word lines which is not selected by the selector, an output terminal being coupled to the negative input terminal. The ground terminal is coupled to the positive input terminal.
    Type: Grant
    Filed: August 26, 2019
    Date of Patent: February 7, 2023
    Assignee: TDK CORPORATION
    Inventors: Naoki Ohta, Yuji Kakinuma, Shinji Hara, Susumu Aoki, Keita Kawamori, Eiji Komura
  • Patent number: 11495739
    Abstract: A magnetoresistance effect element according to an embodiment includes: a spin orbit torque wiring extending in a first direction; a laminated body laminated on the spin orbit torque wiring and having a first ferromagnetic layer, a second ferromagnetic layer, and a non-magnetic layer between the first ferromagnetic layer and the second ferromagnetic layer; a conductive layer in contact with a side of the laminated body opposite to the spin orbit torque wiring; and a heat dissipation layer separated from the laminated body in the first direction and connected to the spin orbit torque wiring and the conductive layer.
    Type: Grant
    Filed: December 23, 2019
    Date of Patent: November 8, 2022
    Assignee: TDK CORPORATION
    Inventor: Eiji Komura
  • Patent number: 11480477
    Abstract: A heat utilizing device is provided in which the thermal resistance of the wiring layer is increased while an increase in electric resistance of the wiring layer is limited. Heat utilizing device has thermistor whose electric resistance changes depending on temperature; and wiring layer that is connected to thermistor. A mean free path of phonons in wiring layer is smaller than a mean free path of phonons in an infinite medium that consists of a material of wiring layer.
    Type: Grant
    Filed: March 6, 2018
    Date of Patent: October 25, 2022
    Assignee: TDK Corporation
    Inventors: Shinji Hara, Naoki Ohta, Susumu Aoki, Eiji Komura, Akimasa Kaizu
  • Publication number: 20220285608
    Abstract: A magnetoresistance effect element includes: a laminate body including a first ferromagnetic layer, a second ferromagnetic layer, and a non-magnetic layer located between the first ferromagnetic layer and the second ferromagnetic layer; and a spin-orbit torque wiring connected to the laminate body. A second surface opposite to a first surface of the spin-orbit torque wiring in contact with the laminate body is curved in a first direction orthogonal to a direction in which the laminate body is laminated.
    Type: Application
    Filed: March 4, 2021
    Publication date: September 8, 2022
    Applicant: TDK CORPORATION
    Inventor: Eiji KOMURA
  • Publication number: 20220190234
    Abstract: The magnetization rotation element includes: a spin-orbit torque wiring; and a first ferromagnetic layer which is stacked on the spin-orbit torque wiring, wherein the spin-orbit torque wiring includes a plurality of wiring layers, and wherein, in a cross section orthogonal to a length direction of the spin-orbit torque wiring, a product between a cross-sectional area and a resistivity of each of the wiring layers is larger in the wiring layer closer to the first ferromagnetic layer.
    Type: Application
    Filed: December 8, 2021
    Publication date: June 16, 2022
    Applicant: TDK CORPORATION
    Inventors: Tomoyuki SASAKI, Yohei SHIOKAWA, Yugo ISHITANI, Kosuke HAMANAKA, Eiji KOMURA
  • Publication number: 20220178759
    Abstract: A thermistor element includes a thermistor film, a first electrode provided in contact with one surface of the thermistor film, and a pair of second electrodes provided in contact with the other surface of the thermistor film, wherein the thermistor film includes an oxide having a spinel crystal structure and having a [111] preferred orientation in a film thickness direction.
    Type: Application
    Filed: December 1, 2021
    Publication date: June 9, 2022
    Applicant: TDK CORPORATION
    Inventors: Maiko SHIROKAWA, Shinji HARA, Naoki OHTA, Susumu AOKI, Eiji KOMURA
  • Publication number: 20220181050
    Abstract: A thermistor element includes: a thermistor film; a first electrode provided in contact with one surface of the thermistor film; and a pair of second electrodes provided in contact with an other surface of the thermistor film, wherein the thermistor film is provided to cover a periphery of the first electrode.
    Type: Application
    Filed: December 1, 2021
    Publication date: June 9, 2022
    Applicant: TDK CORPORATION
    Inventors: Susumu AOKI, Shinji HARA, Naoki OHTA, Maiko SHIROKAWA, Eiji KOMURA
  • Publication number: 20220178758
    Abstract: An electromagnetic wave sensor includes a substrate having transmittance of electromagnetic waves having a specific wavelength, an insulator layer provided on one surface side of the substrate, a thermistor film disposed to have a space between the thermistor film and one surface of the substrate, and a wiring part provided inside or on a surface of the insulator layer and electrically connected to the thermistor film, wherein a transmittance of the electromagnetic waves at a portion facing the thermistor film is relatively higher than a transmittance of the electromagnetic waves at a portion where the wiring part is provided in a layer in which the insulator layer is provided.
    Type: Application
    Filed: December 1, 2021
    Publication date: June 9, 2022
    Applicant: TDK CORPORATION
    Inventors: Shinji HARA, Naoki OHTA, Susumu AOKI, Eiji KOMURA, Maiko SHIROKAWA
  • Publication number: 20220059757
    Abstract: This spin-orbit torque type magnetization rotational element (10) is provided with: a spin-orbit torque wiring (2); a first ferromagnetic layer (1) that is laminated on the spin-orbit torque wiring; a first nonmagnetic metal layer (3) and a second nonmagnetic metal layer (4) that are connected to the spin-orbit torque wiring at positions flanking the first ferromagnetic layer in a plan view from the second direction, and a first insulating layer (31) surrounding the spin-orbit torque wiring, wherein the gravity center (G) of the first ferromagnetic layer is positioned on a side closer to the first nonmagnetic metal layer or the second nonmagnetic metal layer than is a reference point (S) located at the center between the first and second nonmagnetic metal layers in the first direction, and the first insulating layer is any one selected from the group consisting of silicon nitride, aluminum nitride, aluminum oxide, and magnesium oxide.
    Type: Application
    Filed: November 1, 2021
    Publication date: February 24, 2022
    Applicant: TDK CORPORATION
    Inventors: Eiji KOMURA, Tomoyuki SASAKI
  • Patent number: 11243118
    Abstract: An electromagnetic wave sensor that limits the influence on bolometer membranes that is caused by heat from a local heat source is provided. Electromagnetic wave sensor has first substrate, second substrate that faces first substrate so as to form inner space between first substrate and second substrate, wherein second substrate transmits infrared rays; a plurality of bolometer membranes that is provided in inner space and that is supported by second substrate; local heat source that is formed in first substrate; first electric connection member that connects first substrate to second substrate; and lead that extends on or in second substrate and that connects first electric connection member to bolometer membrane.
    Type: Grant
    Filed: March 7, 2018
    Date of Patent: February 8, 2022
    Assignee: TDK Corporation
    Inventors: Naoki Ohta, Shinji Hara, Susumu Aoki, Eiji Komura, Akimasa Kaizu
  • Publication number: 20220006006
    Abstract: A spin current magnetization rotational magnetoresistance effect element includes a magnetoresistance effect element including a first ferromagnetic metal layer in which a direction of magnetization is fixed, a second ferromagnetic metal layer configured for a direction of magnetization to be changed, and a nonmagnetic layer provided between the first ferromagnetic metal layer and the second ferromagnetic metal layer and a spin-orbit torque wiring extending in a first direction intersecting a lamination direction of the magnetoresistance effect element and joined to the second ferromagnetic metal layer. Furthermore, in the spin current magnetization rotational magnetoresistance effect element, the spin-orbit torque wiring containing a pure spin current generation part made of a material that generates a pure spin current and a low resistance part made of a material having electric resistance lower than electrical resistance of the pure spin current generation part.
    Type: Application
    Filed: September 17, 2021
    Publication date: January 6, 2022
    Applicant: TDK CORPORATION
    Inventors: Eiji KOMURA, Tomoyuki SASAKI
  • Patent number: 11195992
    Abstract: A spin-orbit torque type magnetization rotational element includes; a spin-orbit torque wiring that extends in a first direction; a first ferromagnetic layer that is laminated in a second direction intersecting the spin-orbit torque wiring; and a first nonmagnetic metal layer and a second nonmagnetic metal layer that are connected to the spin-orbit torque wiring at positions flanking the first ferromagnetic layer in the first direction in a plan view from the second direction, wherein the gravity center of the first ferromagnetic layer is positioned on a side closer to the first nonmagnetic metal layer or the second nonmagnetic metal layer than is a reference point located at the center between the first and second nonmagnetic metal layers in the first direction.
    Type: Grant
    Filed: January 9, 2019
    Date of Patent: December 7, 2021
    Assignee: TDK CORPORATION
    Inventors: Eiji Komura, Tomoyuki Sasaki
  • Patent number: 11145345
    Abstract: A storage element includes a first ferromagnetic layer; a second ferromagnetic layer; a nonmagnetic layer that is sandwiched between the first ferromagnetic layer and the second ferromagnetic layer in a first direction; a first wiring which extends in a second direction different from the first direction, and the first wiring being configured to sandwich the first ferromagnetic layer with the nonmagnetic layer in the first direction; an electrode which sandwiches the second ferromagnetic layer at least partially with the nonmagnetic layer in the first direction; and a compound part which is positioned inside the electrode and has a lower thermal conductivity than the electrode.
    Type: Grant
    Filed: March 25, 2020
    Date of Patent: October 12, 2021
    Assignee: TDK CORPORATION
    Inventors: Atsushi Tsumita, Yohei Shiokawa, Eiji Komura
  • Publication number: 20210305498
    Abstract: Provided is a magnetoresistance effect element that suppresses re-adhesion of impurities during preparation and allows a write current to easily flow. The magnetoresistance effect element includes a first ferromagnetic layer, a second ferromagnetic layer; and a nonmagnetic layer interposed between the first ferromagnetic layer and the second ferromagnetic layer. In the magnetoresistance effect element, the nonmagnetic layer is a tunnel barrier layer constituted by an insulator, a side surface of the first ferromagnetic layer, a side surface of the second ferromagnetic layer and a side surface of the nonmagnetic layer form a continuous inclined surface in any side surface, and a thickness of inside the nonmagnetic layer is thicker than a thickness of outside the nonmagnetic layer.
    Type: Application
    Filed: June 11, 2021
    Publication date: September 30, 2021
    Applicant: TDK CORPORATION
    Inventors: Tomoyuki SASAKI, Yohei SHIOKAWA, Eiji KOMURA, Keita SUDA
  • Publication number: 20210265560
    Abstract: This magnetization rotational element includes a spin injection region that extends in a first direction, a first ferromagnetic layer that is laminated on the spin injection region, and a metal region that is adjacent to the spin injection region with an insulator interposed therebetween in a second direction orthogonal to the first direction in a plan view in a lamination direction.
    Type: Application
    Filed: December 30, 2020
    Publication date: August 26, 2021
    Applicant: TDK CORPORATION
    Inventors: Eiji KOMURA, Yohei SHIOKAWA