Patents by Inventor Hayato Koike

Hayato Koike 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: 11024727
    Abstract: The magnetoresistance effect element includes a semiconductor layer, a first ferromagnetic layer and a second ferromagnetic layer. The semiconductor layer has a first region, a second region, and a third region. The first ferromagnetic layer is provided on the first region, the second ferromagnetic layer is provided on the second region, and the third region is sandwiched between the first region and the second region in the first direction. The third region has n-type (or p-type) conductivity, and crystal orientations of the semiconductor material in the direction are substantially the same in the first region, the second region, and the third region. An interatomic distance of the first region in the first direction in an upper surface neighboring region including the upper surface is larger (or smaller) than an interatomic distance of the third region in the first direction in an upper surface neighboring region including the upper surface.
    Type: Grant
    Filed: May 19, 2020
    Date of Patent: June 1, 2021
    Assignee: TDK CORPORATION
    Inventor: Hayato Koike
  • Patent number: 10985311
    Abstract: A semiconductor element includes a semiconductor layer, a first electrode and a second electrode. The first electrode and the second electrode are separated from each other on the semiconductor layer. The semiconductor layer has a first semiconductor region and a second semiconductor region. The first electrode and the second electrode are provided on the first semiconductor region. The second semiconductor region is separated from the first electrode and the second electrode. The second semiconductor region is provided to be in contact with at least a part of an end surface of the first semiconductor region. The first semiconductor region has n-type/p-type conductivity. The second semiconductor region has p-type/n-type conductivity.
    Type: Grant
    Filed: September 10, 2019
    Date of Patent: April 20, 2021
    Assignee: TDK CORPORATION
    Inventor: Hayato Koike
  • Patent number: 10950783
    Abstract: A magnetoresistive element includes a channel layer, a first ferromagnetic layer, a second ferromagnetic layer, and a reference electrode. The first ferromagnetic layer, the second ferromagnetic layer, and the reference electrode are apart from each other and are electrically connected to each other through the channel layer. The average resistivity of a sixth region composed of a first region, a second region, and a fourth region is higher than the average resistivity of a seventh region composed of the second region, a third region, and a fifth region.
    Type: Grant
    Filed: May 17, 2019
    Date of Patent: March 16, 2021
    Assignee: TDK CORPORATION
    Inventor: Hayato Koike
  • Patent number: 10833252
    Abstract: The magnetoresistance effect element includes a semiconductor layer, a first ferromagnetic layer and a second ferromagnetic layer. The semiconductor layer has a first region, a second region, and a third region. The first ferromagnetic layer is provided on the first region, the second ferromagnetic layer is provided on the second region, and the third region is sandwiched between the first region and the second region in the first direction. The third region has n-type conductivity, and crystal orientations of the semiconductor material in the first direction are substantially the same in the first region, the second region, and the third region. An interatomic distance of the third region in an upper surface neighboring region including the upper surface is larger than an interatomic distance of the first region in the upper surface neighboring region.
    Type: Grant
    Filed: March 20, 2019
    Date of Patent: November 10, 2020
    Assignee: TDK CORPORATION
    Inventor: Hayato Koike
  • Publication number: 20200279938
    Abstract: The magnetoresistance effect element includes a semiconductor layer, a first ferromagnetic layer and a second ferromagnetic layer. The semiconductor layer has a first region, a second region, and a third region. The first ferromagnetic layer is provided on the first region, the second ferromagnetic layer is provided on the second region, and the third region is sandwiched between the first region and the second region in the first direction. The third region has n-type (or p-type) conductivity, and crystal orientations of the semiconductor material in the direction are substantially the same in the first region, the second region, and the third region. An interatomic distance of the first region in the first direction in an upper surface neighboring region including the upper surface is larger (or smaller) than an interatomic distance of the third region in the first direction in an upper surface neighboring region including the upper surface.
    Type: Application
    Filed: May 19, 2020
    Publication date: September 3, 2020
    Applicant: TDK CORPORATION
    Inventor: Hayato KOIKE
  • Patent number: 10707335
    Abstract: The magnetoresistance effect element includes a semiconductor layer, a first ferromagnetic layer and a second ferromagnetic layer. The semiconductor layer has a first region, a second region, and a third region. The first ferromagnetic layer is provided on the first region, the second ferromagnetic layer is provided on the second region, and the third region is sandwiched between the first region and the second region in the first direction. The third region has n-type conductivity, and crystal orientations of the semiconductor material in the direction are substantially the same in the first region, the second region, and the third region. An interatomic distance of the third region in an upper surface neighboring region is larger than an interatomic distance of the third region in a lower surface neighboring region.
    Type: Grant
    Filed: March 18, 2019
    Date of Patent: July 7, 2020
    Assignee: TDK CORPORATION
    Inventor: Hayato Koike
  • Publication number: 20200098979
    Abstract: A semiconductor element includes a semiconductor layer, a first electrode and a second electrode. The first electrode and the second electrode are separated from each other on the semiconductor layer. The semiconductor layer has a first semiconductor region and a second semiconductor region. The first electrode and the second electrode are provided on the first semiconductor region. The second semiconductor region is separated from the first electrode and the second electrode. The second semiconductor region is provided to be in contact with at least a part of an end surface of the first semiconductor region. The first semiconductor region has n-type/p-type conductivity. The second semiconductor region has p-type/n-type conductivity.
    Type: Application
    Filed: September 10, 2019
    Publication date: March 26, 2020
    Applicant: TDK CORPORATION
    Inventor: Hayato KOIKE
  • Publication number: 20190305118
    Abstract: The magnetoresistance effect element includes a semiconductor layer, a first ferromagnetic layer and a second ferromagnetic layer. The semiconductor layer has a first region, a second region, and a third region. The first ferromagnetic layer is provided on the first region, the second ferromagnetic layer is provided on the second region, and the third region is sandwiched between the first region and the second region in the first direction. The third region has n-type conductivity, and crystal orientations of the semiconductor material in the direction are substantially the same in the first region, the second region, and the third region. An interatomic distance of the third region in an upper surface neighboring region is larger than an interatomic distance of the third region in a lower surface neighboring region.
    Type: Application
    Filed: March 18, 2019
    Publication date: October 3, 2019
    Applicant: TDK CORPORATION
    Inventor: Hayato KOIKE
  • Publication number: 20190305214
    Abstract: The magnetoresistance effect element includes a semiconductor layer, a first ferromagnetic layer and a second ferromagnetic layer. The semiconductor layer has a first region, a second region, and a third region. The first ferromagnetic layer is provided on the first region, the second ferromagnetic layer is provided on the second region, and the third region is sandwiched between the first region and the second region in the first direction. The third region has n-type conductivity, and crystal orientations of the semiconductor material in the first direction are substantially the same in the first region, the second region, and the third region. An interatomic distance of the third region in an upper surface neighboring region including the upper surface is larger than an interatomic distance of the first region in the upper surface neighboring region.
    Type: Application
    Filed: March 20, 2019
    Publication date: October 3, 2019
    Applicant: TDK CORPORATION
    Inventor: Hayato KOIKE
  • Publication number: 20190296229
    Abstract: A magnetoresistive element includes a channel layer, a first ferromagnetic layer, a second ferromagnetic layer, and a reference electrode. The first ferromagnetic layer, the second ferromagnetic layer, and the reference electrode are apart from each other and are electrically connected to each other through the channel layer. The average resistivity of a sixth region composed of a first region, a second region, and a fourth region is higher than the average resistivity of a seventh region composed of the second region, a third region, and a fifth region.
    Type: Application
    Filed: May 17, 2019
    Publication date: September 26, 2019
    Applicant: TDK CORPORATION
    Inventor: Hayato KOIKE
  • Patent number: 10347823
    Abstract: A magnetoresistive element includes a channel layer, a first ferromagnetic layer, a second ferromagnetic layer, and a reference electrode. The first ferromagnetic layer, the second ferromagnetic layer, and the reference electrode are apart from each other and are electrically connected to each other through the channel layer. The average resistivity of a sixth region composed of a first region, a second region, and a fourth region is higher than the average resistivity of a seventh region composed of the second region, a third region, and a fifth region.
    Type: Grant
    Filed: March 16, 2017
    Date of Patent: July 9, 2019
    Assignee: TDK CORPORATION
    Inventor: Hayato Koike
  • Patent number: 10176035
    Abstract: A system for migrating a virtual machine includes: a first device; and a second device. The first device notifies the second device of failure information indicating that data transported to the second device includes an error originated from the first device, when the error is detected from a storage area in the first device. The second device writes a second identifier, whose value is different from that of a first identifier, into a memory of the second device while associating the second identifier with a second address, the second address being to serve as a copy destination of data indicated by the failure information, wherein the first identifier indicates that data in the second address includes an error originated from the second device, and the second identifier serves as an identifier indicating that data in the second address includes an error originated from the first device.
    Type: Grant
    Filed: July 22, 2016
    Date of Patent: January 8, 2019
    Assignee: FUJITSU LIMITED
    Inventors: Hayato Koike, Hiroshi Kondou, Takafumi Anraku, Kenji Gotsubo
  • Patent number: 10141501
    Abstract: A magnetoresistive element includes a channel layer, a first ferromagnetic layer, a second ferromagnetic layer, and a reference electrode. The first ferromagnetic layer, the second ferromagnetic layer, and the reference electrode are apart from each other and are electrically connected to each other through the channel layer. The effective cross-sectional area of a sixth region according to a plane perpendicularly intersecting a spin-polarized carrier transport path in the sixth region is smaller than the effective cross-sectional area of a seventh region according to a plane perpendicularly intersecting a voltage detection path in the seventh region.
    Type: Grant
    Filed: March 16, 2017
    Date of Patent: November 27, 2018
    Assignee: TDK CORPORATION
    Inventor: Hayato Koike
  • Publication number: 20170288133
    Abstract: A magnetoresistive element includes a channel layer, a first ferromagnetic layer, a second ferromagnetic layer, and a reference electrode. The first ferromagnetic layer, the second ferromagnetic layer, and the reference electrode are apart from each other and are electrically connected to each other through the channel layer. The effective cross-sectional area of a sixth region according to a plane perpendicularly intersecting a spin-polarized carrier transport path in the sixth region is smaller than the effective cross-sectional area of a seventh region according to a plane perpendicularly intersecting a voltage detection path in the seventh region.
    Type: Application
    Filed: March 16, 2017
    Publication date: October 5, 2017
    Applicant: TDK CORPORATION
    Inventor: Hayato KOIKE
  • Publication number: 20170288132
    Abstract: A magnetoresistive element includes a channel layer, a first ferromagnetic layer, a second ferromagnetic layer, and a reference electrode. The first ferromagnetic layer, the second ferromagnetic layer, and the reference electrode are apart from each other and are electrically connected to each other through the channel layer. The average resistivity of a sixth region composed of a first region, a second region, and a fourth region is higher than the average resistivity of a seventh region composed of the second region, a third region, and a fifth region.
    Type: Application
    Filed: March 16, 2017
    Publication date: October 5, 2017
    Applicant: TDK CORPORATION
    Inventor: Hayato KOIKE
  • Patent number: 9728713
    Abstract: Spin-transport elements using semiconductors have had the problem of higher element resistance than conventional GMR elements and TMR elements, making it difficult to obtain high magnetoresistance ratios. A magnetoresistive element including a semiconductor channel layer; a first ferromagnetic layer disposed on the semiconductor channel layer; a second ferromagnetic layer disposed away from the first ferromagnetic layer; and a non-magnetic first reference electrode disposed away from the first ferromagnetic layer and the second ferromagnetic layer, wherein current is input from the second ferromagnetic layer to the first ferromagnetic layer through the semiconductor channel layer, a voltage between the second ferromagnetic layer and the first reference electrode is output.
    Type: Grant
    Filed: November 14, 2014
    Date of Patent: August 8, 2017
    Assignee: TDK CORPORATION
    Inventors: Tomoyuki Sasaki, Tohru Oikawa, Hayato Koike
  • Publication number: 20170031745
    Abstract: A system for migrating a virtual machine includes: a first device; and a second device. The first device notifies the second device of failure information indicating that data transported to the second device includes an error originated from the first device, when the error is detected from a storage area in the first device. The second device writes a second identifier, whose value is different from that of a first identifier, into a memory of the second device while associating the second identifier with a second address, the second address being to serve as a copy destination of data indicated by the failure information, wherein the first identifier indicates that data in the second address includes an error originated from the second device, and the second identifier serves as an identifier indicating that data in the second address includes an error originated from the first device.
    Type: Application
    Filed: July 22, 2016
    Publication date: February 2, 2017
    Applicant: FUJITSU LIMITED
    Inventors: Hayato Koike, Hiroshi Kondou, Takafumi ANRAKU, Kenji GOTSUBO
  • Publication number: 20160284982
    Abstract: Spin-transport elements using semiconductors have had the problem of higher element resistance than conventional GMR elements and TMR elements, making it difficult to obtain high magnetoresistance ratios. A magnetoresistive element including a semiconductor channel layer; a first ferromagnetic layer disposed on the semiconductor channel layer; a second ferromagnetic layer disposed away from the first ferromagnetic layer; and a non-magnetic first reference electrode disposed away from the first ferromagnetic layer and the second ferromagnetic layer, wherein current is input from the second ferromagnetic layer to the first ferromagnetic layer through the semiconductor channel layer, a voltage between the second ferromagnetic layer and the first reference electrode is output.
    Type: Application
    Filed: November 14, 2014
    Publication date: September 29, 2016
    Applicant: TDK Corporation
    Inventors: Tomoyuki SASAKI, Tohru OIKAWA, Hayato KOIKE
  • Patent number: 9323674
    Abstract: A processor includes: a primary cache memory; an instruction control unit that issues a store request to the primary cache memory; a pipeline processing unit that, upon receiving the store request, writes data to the primary cache memory; a buffer unit that obtains an address output to the primary cache memory from the pipeline processing unit during an output period of the store request regarding certain data to hold the obtained address in an entry, and when the output period ends, issues a write-back request for writing the data indicated by the address held in the entry to a memory; and a secondary cache memory that, upon receiving the write-back request from the buffer unit, writes the data of the primary cache memory to the memory, the certain data is quickly written back to the memory from the primary cache memory.
    Type: Grant
    Filed: January 13, 2014
    Date of Patent: April 26, 2016
    Assignee: FUJITSU LIMITED
    Inventors: Hayato Koike, Naohiro Kiyota
  • Publication number: 20150001601
    Abstract: To provide a spin injection electrode structure capable of injecting spins into a semiconductor with high efficiency and a spin transport element having the same. Aluminum oxide containing a ?-phase is used as a material making up a tunnel barrier layer. A protective film is formed outside the tunnel barrier layer. This allows a good spin injection electrode structure with few defects in a crystal or at a junction interface to be obtained, enables spins to be injected into a semiconductor with high efficiency, and allows a spin transport element having high output characteristics at room temperature to be provided.
    Type: Application
    Filed: February 12, 2013
    Publication date: January 1, 2015
    Inventors: Hayato Koike, Tohru Oikawa, Tomoyuki Sasaki