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: 11063210
    Abstract: Provided is a spin-orbit-torque magnetization rotational element that suppresses re-adhesion of impurities during preparation and allows a write current to easily flow. The spin-orbit-torque magnetization rotational element includes a spin-orbit torque wiring that extends in a first direction, and a first ferromagnetic layer that is located on a side of one surface of the spin-orbit torque wiring. A side surface of the spin-orbit torque wiring and a side surface of the first ferromagnetic layer form a continuous inclined surface in any side surface.
    Type: Grant
    Filed: April 9, 2020
    Date of Patent: July 13, 2021
    Assignee: TDK CORPORATION
    Inventors: Tomoyuki Sasaki, Yohei Shiokawa, Eiji Komura, Keita Suda
  • Publication number: 20210151665
    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: Application
    Filed: January 9, 2019
    Publication date: May 20, 2021
    Applicant: TDK CORPORATION
    Inventors: Eiji KOMURA, Tomoyuki SASAKI
  • Patent number: 10998493
    Abstract: A spin-orbit-torque magnetoresistance effect element of the present invention includes: a functional unit, a first ferromagnetic layer whose magnetization direction is configured to be fixed, a second ferromagnetic layer whose magnetization direction is configured to change, and a non-magnetic layer located between the first ferromagnetic layer and the second ferromagnetic layer being laminated therein; a spin-orbit torque wiring which extends in a first direction which intersects a lamination direction of the functional unit and is joined to the second ferromagnetic layer; a heat sink layer which extends in the first direction, is disposed so that the heat sink layer and the spin-orbit torque wiring at least partially overlap when viewed in a plan view from the lamination direction, and is provided spaced from the spin-orbit torque wiring in the lamination direction by a distance of twice a thickness of the functional unit or less in the lamination direction thereof.
    Type: Grant
    Filed: September 23, 2019
    Date of Patent: May 4, 2021
    Assignee: TDK CORPORATION
    Inventor: Eiji Komura
  • Publication number: 20210025765
    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: Application
    Filed: March 6, 2018
    Publication date: January 28, 2021
    Inventors: Shinji HARA, Naoki OHTA, Susumu AOKI, Eiji KOMURA, Akimasa KAIZU
  • Publication number: 20200408604
    Abstract: An electromagnetic wave sensor that limits the influence on bolometer membranes that is caused by heat from a local heat source is provided. Eelectromagnetic 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: Application
    Filed: March 7, 2018
    Publication date: December 31, 2020
    Inventors: Naoki OHTA, Shinji HARA, Susumu AOKI, Eiji KOMURA, Akimasa KAIZU
  • Publication number: 20200312392
    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: Application
    Filed: March 25, 2020
    Publication date: October 1, 2020
    Applicant: TDK CORPORATION
    Inventors: Atsushi TSUMITA, Yohei SHIOKAWA, Eiji KOMURA
  • Patent number: 10756262
    Abstract: A spin-orbit-torque magnetization rotational element includes: a spin-orbit-torque wiring which extends in a first direction; and a first ferromagnetic layer which is laminated in a second direction intersecting the spin-orbit-torque wiring, wherein the spin-orbit-torque wiring includes a convex portion which protrudes in the second direction in relation to a first surface on the side of the first ferromagnetic layer at a connecting part between the spin-orbit-torque wiring and the first ferromagnetic layer.
    Type: Grant
    Filed: February 22, 2019
    Date of Patent: August 25, 2020
    Assignee: TDK CORPORATION
    Inventors: Eiji Komura, Yohei Shiokawa
  • Publication number: 20200235290
    Abstract: Provided is a spin-orbit-torque magnetization rotational element that suppresses re-adhesion of impurities during preparation and allows a write current to easily flow. The spin-orbit-torque magnetization rotational element includes a spin-orbit torque wiring that extends in a first direction, and a first ferromagnetic layer that is located on a side of one surface of the spin-orbit torque wiring. A side surface of the spin-orbit torque wiring and a side surface of the first ferromagnetic layer form a continuous inclined surface in any side surface.
    Type: Application
    Filed: April 9, 2020
    Publication date: July 23, 2020
    Applicant: TDK CORPORATION
    Inventors: Tomoyuki SASAKI, Yohei SHIOKAWA, Eiji KOMURA, Keita SUDA
  • Patent number: 10644228
    Abstract: Provided is a spin-orbit-torque magnetization rotational element that suppresses re-adhesion of impurities during preparation and allows a write current to easily flow. The spin-orbit-torque magnetization rotational element includes a spin-orbit torque wiring that extends in a first direction, and a first ferromagnetic layer that is located on a side of one surface of the spin-orbit torque wiring. A side surface of the spin-orbit torque wiring and a side surface of the first ferromagnetic layer form a continuous inclined surface in any side surface.
    Type: Grant
    Filed: November 1, 2018
    Date of Patent: May 5, 2020
    Assignee: TDK CORPORATION
    Inventors: Tomoyuki Sasaki, Yohei Shiokawa, Eiji Komura, Keita Suda
  • Publication number: 20200106004
    Abstract: A spin-orbit-torque magnetoresistance effect element of the present invention includes: a functional unit, a first ferromagnetic layer whose magnetization direction is configured to be fixed, a second ferromagnetic layer whose magnetization direction is configured to change, and a non-magnetic layer located between the first ferromagnetic layer and the second ferromagnetic layer being laminated therein; a spin-orbit torque wiring which extends in a first direction which intersects a lamination direction of the functional unit and is joined to the second ferromagnetic layer; a heat sink layer which extends in the first direction, is disposed so that the heat sink layer and the spin-orbit torque wiring at least partially overlap when viewed in a plan view from the lamination direction, and is provided spaced from the spin-orbit torque wiring in the lamination direction by a distance of twice a thickness of the functional unit or less in the lamination direction thereof.
    Type: Application
    Filed: September 23, 2019
    Publication date: April 2, 2020
    Applicant: TDK CORPORATION
    Inventor: Eiji KOMURA
  • Publication number: 20200072664
    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: Application
    Filed: August 26, 2019
    Publication date: March 5, 2020
    Applicant: TDK CORPORATION
    Inventors: Naoki OHTA, Yuji KAKINUMA, Shinji HARA, Susumu AOKI, Keita KAWAMORI, Eiji KOMURA
  • Publication number: 20190267542
    Abstract: A spin-orbit-torque magnetization rotational element includes: a spin-orbit-torque wiring which extends in a first direction; and a first ferromagnetic layer which is laminated in a second direction intersecting the spin-orbit-torque wiring, wherein the spin-orbit-torque wiring includes a convex portion which protrudes in the second direction in relation to a first surface on the side of the first ferromagnetic layer at a connecting part between the spin-orbit-torque wiring and the first ferromagnetic layer.
    Type: Application
    Filed: February 22, 2019
    Publication date: August 29, 2019
    Applicant: TDK CORPORATION
    Inventors: Eiji KOMURA, Yohei SHIOKAWA
  • Patent number: 10374151
    Abstract: Provided is a spin current magnetoresistance effect element, including: a magnetoresistance effect element including a first ferromagnetic metal layer, a second ferromagnetic metal layer configured for magnetization direction to be changed, and a non-magnetic layer sandwiched between the first ferromagnetic metal layer and the second ferromagnetic metal layer; and a spin-orbit torque wiring extending in a first direction which intersects a lamination direction of the magnetoresistance effect element and joined to the second ferromagnetic metal layer, wherein, a third end portion of the non-magnetic layer is located between a first end portion of the first ferromagnetic metal layer and a second end portion of the second ferromagnetic metal layer as viewed from the lamination direction on one of side surfaces of the magnetoresistance effect element.
    Type: Grant
    Filed: August 6, 2018
    Date of Patent: August 6, 2019
    Assignee: TDK CORPORATION
    Inventors: Eiji Komura, Yohei Shiokawa
  • Publication number: 20190148629
    Abstract: Provided is a spin-orbit-torque magnetization rotational element that suppresses re-adhesion of impurities during preparation and allows a write current to easily flow. The spin-orbit-torque magnetization rotational element includes a spin-orbit torque wiring that extends in a first direction, and a first ferromagnetic layer that is located on a side of one surface of the spin-orbit torque wiring. A side surface of the spin-orbit torque wiring and a side surface of the first ferromagnetic layer form a continuous inclined surface in any side surface.
    Type: Application
    Filed: November 1, 2018
    Publication date: May 16, 2019
    Applicant: TDK CORPORATION
    Inventors: Tomoyuki SASAKI, Yohei SHIOKAWA, Eiji KOMURA, Keita SUDA
  • Publication number: 20190067563
    Abstract: Provided is a spin current magnetoresistance effect element, including: a magnetoresistance effect element including a first ferromagnetic metal layer, a second ferromagnetic metal layer configured for magnetization direction to be changed, and a non-magnetic layer sandwiched between the first ferromagnetic metal layer and the second ferromagnetic metal layer; and a spin-orbit torque wiring extending in a first direction which intersects a lamination direction of the magnetoresistance effect element and joined to the second ferromagnetic metal layer, wherein, a third end portion of the non-magnetic layer is located between a first end portion of the first ferromagnetic metal layer and a second end portion of the second ferromagnetic metal layer as viewed from the lamination direction on one of side surfaces of the magnetoresistance effect element.
    Type: Application
    Filed: August 6, 2018
    Publication date: February 28, 2019
    Applicant: TDK CORPORATION
    Inventors: Eiji KOMURA, Yohei SHIOKAWA
  • Patent number: 9305573
    Abstract: A thermally assisted magnetic recording head includes core that propagates laser light as propagation light, a near-field light generator that faces a portion of the core and extends to an air bearing surface (ABS), the near-field light generator coupled to the propagation light propagating through the core so as to generate a surface plasmon, propagating the surface plasmon to an end part facing the ABS, and generating near-field light at the end part to irradiate the near-field light to a magnetic recording medium, a main magnetic pole layer provided in the vicinity of the near-field light generator where an end part is positioned on the ABS, a laser diode that generates laser light of wavelength 890 nm to 1,000 nm and enters the laser light into the core, and a photodiode provided on a silicon substrate measures an intensity of the laser light entering from the laser diode to the core.
    Type: Grant
    Filed: March 14, 2013
    Date of Patent: April 5, 2016
    Assignee: TDK Corporation
    Inventors: Shinji Hara, Tsutomu Chou, Koji Shimazawa, Eiji Komura, Seiichi Takayama, Yasuhiro Ito
  • Patent number: 9165581
    Abstract: A thermally assisted magnetic recording head has a generator end surface facing an air bearing surface (ABS), and includes: a near-field light (NF light) generator that generates an NF light on the generator end surface and irradiates a magnetic recording medium with the NF light, and a main magnetic pole end surface positioned in the vicinity of the generator end surface; a main magnetic pole that emits a magnetic flux from the main magnetic pole end surface to the magnetic recording medium and a shield end surface positioned in the vicinity of the generator end surface; and a return shield that is magnetically linked to the main magnetic pole, and that absorbs the magnetic flux returning from the magnetic recording medium at the shield end surface.
    Type: Grant
    Filed: March 11, 2014
    Date of Patent: October 20, 2015
    Assignee: TDK Corporation
    Inventors: Susumu Aoki, Takafumi Kobayashi, Kei Hirata, Eiji Komura, Tsutomu Chou
  • Patent number: 9165582
    Abstract: A thermal assisted magnetic recording head has a magnetic head slider having an air bearing surface that is opposite to a magnetic recording medium, a core that can propagate laser light as propagating light, a plasmon generator that includes a generator front end surface facing the air bearing surface, and a main pole facing the air bearing surface, and a laser light generator that supplies the laser light to the core. The plasmon generator generates near-field light (NF light) at the generator front end surface to heat the magnetic recording medium. The main pole includes a main pole end surface that faces the air bearing surface and that is positioned in the vicinity of the generator front end surface, and emits a magnetic flux to the magnetic recording medium from the main pole end surface.
    Type: Grant
    Filed: April 11, 2014
    Date of Patent: October 20, 2015
    Assignee: TDK Corporation
    Inventors: Shinji Hara, Eiji Komura, Norikazu Ota, Daisuke Miyauchi, Tetsuya Roppongi, Koji Shimazawa
  • Publication number: 20150294678
    Abstract: A thermal assisted magnetic recording head has a magnetic head slider having an air bearing surface that is opposite to a magnetic recording medium, a core that can propagate laser light as propagating light, a plasmon generator that includes a generator front end surface facing the air bearing surface, and a main pole facing the air bearing surface, and a laser light generator that supplies the laser light to the core. The plasmon generator generates near-field light (NF light) at the generator front end surface to heat the magnetic recording medium. The main pole includes a main pole end surface that faces the air bearing surface and that is positioned in the vicinity of the generator front end surface, and emits a magnetic flux to the magnetic recording medium from the main pole end surface.
    Type: Application
    Filed: April 11, 2014
    Publication date: October 15, 2015
    Applicant: TDK Corporation
    Inventors: Shinji HARA, Eiji KOMURA, Norikazu OTA, Daisuke MIYAUCHI, Tetsuya ROPPONGI, Koji SHIMAZAWA
  • Patent number: 9153267
    Abstract: A thermally-assisted magnetic recording head of the invention includes: a waveguide; a plasmon generator; and a light-absorbing protrusion layer provided on a leading side of the plasmon generator. A ratio W1/W2 is within a range from 2/3 to 55/3, where W1 is a width of the light-absorbing protrusion layer in an air-bearing surface, and W2 is a width of the waveguide in the air-bearing surface.
    Type: Grant
    Filed: May 13, 2014
    Date of Patent: October 6, 2015
    Assignee: TDK CORPORATION
    Inventors: Eiji Komura, Shinji Hara, Norikazu Ota, Tetsuya Roppongi, Kosuke Tanaka