Patents by Inventor Akira Kikitsu

Akira Kikitsu 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: 11992320
    Abstract: According to one embodiment, a sensor includes a first magnetic member, a first counter magnetic member, a first magnetic element, and a first magnetic interconnect. A direction from the first magnetic member to the first counter magnetic member is along a first direction. A first gap is provided between the first magnetic member and the first counter magnetic member. The first magnetic element includes a first magnetic region. A second direction from the first magnetic region to the first gap crosses the first direction. A direction from the first magnetic interconnect to the first magnetic region is along the second direction.
    Type: Grant
    Filed: February 28, 2022
    Date of Patent: May 28, 2024
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Yoshihiro Higashi, Akira Kikitsu, Satoshi Shirotori, Yoshinari Kurosaki
  • Publication number: 20240135961
    Abstract: According to one embodiment, a magnetic sensor includes first to sixth shields, first and second magnetic layers, a first member, and first to fourth terminals. The first magnetic layer is provided between the first shield and the second shield. The first magnetic layer is between the third shield and the fourth shield in the second direction. The second magnetic layer is provided between the first magnetic layer and the second shield. The second magnetic layer is between the fifth shield and the sixth shield in the second direction. The second magnetic layer is electrically connected to the fifth shield and the sixth shield. The first member includes a first region and a second region. The first region is provided between the third shield and the first magnetic layer. The second region is provided between the first magnetic layer and the fourth shield.
    Type: Application
    Filed: July 26, 2023
    Publication date: April 25, 2024
    Applicant: KABUSHIKI KAISHA TOSHIBA
    Inventors: Tazumi NAGASAWA, Satoshi SHIROTORI, Akira KIKITSU, Yoshihiro HIGASHI
  • Publication number: 20240135967
    Abstract: According to one embodiment, a magnetic sensor includes first to fourth shields, a first magnetic layer, first and second conductive layers, and first and second intermediate layer. The first magnetic layer is between the third shield and the fourth shield. The first magnetic layer includes a first face and a second face. The first face is between the first shield and the second face. The first conductive layer is provided between the third shield and the first magnetic layer. The second conductive layer is provided between the first magnetic layer and the fourth shield. The first intermediate layer is provided between the first shield and the first magnetic layer. The first intermediate layer includes a first intermediate layer face facing the first face. An area of the first intermediate layer face is smaller than an area of the first face.
    Type: Application
    Filed: July 26, 2023
    Publication date: April 25, 2024
    Applicant: KABUSHIKI KAISHA TOSHIBA
    Inventors: Tazumi NAGASAWA, Satoshi SHIROTORI, Akira KIKITSU, Yoshihiro HIGASHI
  • Patent number: 11946975
    Abstract: According to one embodiment, a magnetic sensor includes a first sensor part. The first sensor part includes a first magnetic member, a first counter magnetic member, and a first magnetic element. A direction from the first magnetic member toward the first counter magnetic member is along a first direction. The first magnetic element includes one or a plurality of first extension parts. The first extension part includes a first magnetic layer, a first counter magnetic layer, and a first nonmagnetic layer. The first magnetic layer includes a first portion, a first counter portion, and a first middle portion. A direction from the first portion toward the first counter portion is along the first direction. The first middle portion is between the first portion and the first counter portion. The first nonmagnetic layer is between the first counter magnetic layer and at least a portion of the first middle portion.
    Type: Grant
    Filed: August 23, 2021
    Date of Patent: April 2, 2024
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Hitoshi Iwasaki, Satoshi Shirotori, Akira Kikitsu, Yoshihiro Higashi
  • Publication number: 20240077551
    Abstract: According to one embodiment, a sensor includes an element portion including a first element, and a controller. The first element includes a first magnetic element including a first magnetic layer and a first opposing magnetic layer, and a first conductive member including a first conductive portion and a first other conductive portion. A second direction from the first other conductive portion to the first conductive portion crosses a first direction from the first magnetic layer to the first opposing magnetic layer. The controller includes a first circuit electrically connected to the first conductive portion and the first other conductive portion, and configured to supply a first current including an AC component to the first conductive member. A local maximum value of the first current is of the first polarity. A local minimum value of the first current is of the first polarity or 0.
    Type: Application
    Filed: February 27, 2023
    Publication date: March 7, 2024
    Applicant: KABUSHIKI KAISHA TOSHIBA
    Inventors: Yoshihiro HIGASHI, Akira KIKITSU, Satoshi SHIROTORI
  • Publication number: 20240077550
    Abstract: According to one embodiment, a sensor includes an element portion. The element portion includes a first magnetic element, a second magnetic element, a first conductive member, and a second conductive member. The first magnetic element includes a first end portion and a first other end portion. A direction from the first end portion to the first other end portion is along a first direction. The second magnetic element includes a second end portion and a second other end portion. A direction from the second end portion to the second other end portion is along the first direction. The first conductive member includes a first portion, a first other portion, a second portion, and a second other portion. The second conductive member includes a first conductive portion, a first other conductive portion, a second conductive portion, and a second other conductive portion.
    Type: Application
    Filed: February 24, 2023
    Publication date: March 7, 2024
    Applicant: KABUSHIKI KAISHA TOSHIBA
    Inventors: Yoshihiro HIGASHI, Akira KIKITSU, Satoshi SHIROTORI
  • Publication number: 20240069071
    Abstract: According to one embodiment, a magnetic sensor includes a first element portion that includes a first magnetic element, a first conductive member, a first magnetic member and a first opposing magnetic member. The first magnetic element includes a first end portion and a first other end portion. A direction from the first end portion to the first other end portion is along a first direction. A second direction from the first conductive member to the first magnetic element crosses the first direction. A third direction from the first magnetic member to the first opposing magnetic member crosses a plane including the first and second directions. At least a part of the first magnetic element is between the first magnetic member and the first opposing magnetic member in position in the third direction. The first magnetic member includes a first other magnetic portion and a first magnetic portion.
    Type: Application
    Filed: February 9, 2023
    Publication date: February 29, 2024
    Applicant: KABUSHIKI KAISHA TOSHIBA
    Inventors: Satoshi SHIROTORI, Akira KIKITSU, Yoshihiro HIGASHI
  • Publication number: 20240053414
    Abstract: According to one embodiment, a magnetic sensor includes an element portion and a conducive layer. The element portion includes a first magnetic element, a second magnetic element, a first conductive member, and a second conductive member. The first magnetic element includes a first end portion and a first other end portion. The second magnetic element includes a second end portion and a second other end portion. The first conductive member includes a first portion and a first other portion. The first portion corresponds to the first end portion. The first other portion corresponds to the first other end portion. The second conductive member includes a second portion and a second other portion. The second portion corresponds to the second end portion. The second other portion corresponds to the second other end portion. The conductive layer includes a first conductive portion and a first other conductive portion.
    Type: Application
    Filed: February 9, 2023
    Publication date: February 15, 2024
    Applicant: KABUSHIKI KAISHA TOSHIBA
    Inventors: Akira KIKITSU, Yoshihiro HIGASHI, Satoshi SHIROTORI
  • Publication number: 20240003998
    Abstract: According to one embodiment, a sensor includes an element portion including a first element. The first element includes a first magnetic element, a first conductive member, and a first magnetic portion. The first magnetic element includes a first magnetic layer and a first opposing magnetic layer. A length of the first magnetic element along a second direction crossing a first direction from the first magnetic layer to the first opposing magnetic layer is longer than a length of the first magnetic element along a third direction crossing a plane including the first direction and the second direction. The first conductive member includes a first conductive portion and a first other conductive portion. A direction from the first other conductive portion to the first conductive portion is along the second direction. A direction from the first magnetic portion to the first magnetic element is along the second direction.
    Type: Application
    Filed: February 3, 2023
    Publication date: January 4, 2024
    Applicant: KABUSHIKI KAISHA TOSHIBA
    Inventors: Akira KIKITSU, Yoshihiro HIGASHI, Satoshi SHIROTORI
  • Publication number: 20240003999
    Abstract: According to one embodiment, a sensor includes an element portion. The element portion includes a first magnetic member, a first opposing magnetic member, a first element, a second magnetic member, a second opposing magnetic member, a second element, a third element, and a fourth element. The first opposing magnetic member is separated from the first magnetic member in a first direction from the first magnetic member to the first opposing magnetic member. The first element includes a first magnetic layer, a first portion and a first other portion. The second opposing magnetic member is separated from the second magnetic member in the first direction. The second element includes a second magnetic layer, a second portion and a second other portion. The third element includes a third portion and a third other portion. The fourth element includes a fourth portion and a fourth other portion.
    Type: Application
    Filed: February 6, 2023
    Publication date: January 4, 2024
    Applicant: KABUSHIKI KAISHA TOSHIBA
    Inventors: Akira KIKITSU, Yoshihiro HIGASHI, Satoshi SHIROTORI
  • Patent number: 11815570
    Abstract: According to one embodiment, a magnetic sensor includes a first magnetic part, a first magnetic member, a second magnetic part, a second magnetic member, a first element, a second element, a third element, a fourth element, and a first interconnect. The first magnetic part includes first, second, and third portions. The first portion is between the second and third portions. The second magnetic part includes fourth, fifth, and sixth portions. The fourth portion is between the fifth and sixth portions. The first element includes a first magnetic layer. The second element includes a second magnetic layer. The third element includes a third magnetic layer. The fourth element includes a fourth magnetic layer. The first interconnect includes first and second interconnect portions.
    Type: Grant
    Filed: September 14, 2020
    Date of Patent: November 14, 2023
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Hitoshi Iwasaki, Akira Kikitsu, Yoshihiro Higashi, Satoshi Shirotori
  • Patent number: 11789096
    Abstract: According to one embodiment, a sensor includes a first element. The first element includes first and second magnetic members, an insulating member, first and second wirings, a first magnetic element, and a first conductive member. The second magnetic member is separated from the first magnetic member. The insulating member includes a first insulating region. The first insulating region is provided between the first and second magnetic members. The first wiring includes a first connecting region. The second wiring includes a second connecting region. The first magnetic element includes a first magnetic layer and a first opposed magnetic layer. The first magnetic element includes first to fifth partial regions. The first partial region is between the fourth and fifth partial regions. The second partial region is between the fourth and first partial region. The third partial region is between the first and fifth partial regions.
    Type: Grant
    Filed: July 27, 2022
    Date of Patent: October 17, 2023
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Akira Kikitsu, Yoshihiro Higashi, Satoshi Shirotori
  • Publication number: 20230326482
    Abstract: According to one embodiment, a magnetic head includes a first magnetic pole, a second magnetic pole, a magnetic element, and a magnetic member. The magnetic element is provided between the first and second magnetic poles, and includes a first magnetic layer. The magnetic member includes a first magnetic part. A second direction from the first magnetic part to the magnetic element crosses a first direction from the first to second magnetic pole. The first magnetic part includes a magnetic material including at least one of first to third materials. The first material includes at least one selected from the group consisting of Mn3Sn, Mn3Ge and Mn3Ga. The second material includes at least one selected from the group consisting of a cubic or tetragonal compound including Mn and Ni, a cubic alloy including ?-phase Mn, and a cubic alloy including Fe. The third material includes an antiferromagnet.
    Type: Application
    Filed: June 6, 2023
    Publication date: October 12, 2023
    Applicants: KABUSHIKI KAISHA TOSHIBA, TOSHIBA ELECTRONIC DEVICES & STORAGE CORPORATION
    Inventors: Yuji NAKAGAWA, Naoyuki NARITA, Masayuki TAKAGISHI, Tomoyuki MAEDA, Tazumi NAGASAWA, Kenichiro YAMADA, Akira KIKITSU
  • Patent number: 11759118
    Abstract: According to one embodiment, a magnetic sensor includes a first sensor part, and a conductive member. The first sensor part includes a first magnetic element, a first side magnetic part, and a first counter side magnetic part. The conductive member includes a first corresponding portion along the first magnetic element. The first magnetic element includes a first magnetic layer, a first counter magnetic layer, a direction from the first magnetic layer toward the first counter magnetic layer being along a first direction, and a first intermediate magnetic layer located between the first magnetic layer and the first counter magnetic layer. The first side magnetic part includes a first side magnetic layer. The first counter side magnetic part includes a first counter side magnetic layer. The first intermediate magnetic layer is between the first side magnetic layer and the first counter side magnetic layer in a second direction.
    Type: Grant
    Filed: August 12, 2021
    Date of Patent: September 19, 2023
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Hitoshi Iwasaki, Satoshi Shirotori, Akira Kikitsu, Yoshihiro Higashi
  • Patent number: 11747303
    Abstract: According to one embodiment of the invention, a magnetic sensor includes a first sensor part. The first sensor part includes a first magnetic member, a first counter magnetic member, and a first magnetic element. A direction from the first magnetic member to the first counter magnetic member is along a first direction. The first magnetic element includes one or a plurality of first extending portions. A first portion of the first extending portion overlaps the first magnetic member in a second direction crossing the first direction. A first counter portion of the first extending portion overlaps the first counter magnetic member in the second direction. A first direction length along the first direction of the first extending portion is longer than a third direction length along a third direction of the first extending portion. The third direction crosses a plane including the first direction and the second direction.
    Type: Grant
    Filed: August 5, 2021
    Date of Patent: September 5, 2023
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Hitoshi Iwasaki, Satoshi Shirotori, Akira Kikitsu, Yoshihiro Higashi
  • Publication number: 20230266410
    Abstract: According to one embodiment, a sensor includes a first element. The first element includes first and second magnetic members, an insulating member, first and second wirings, a first magnetic element, and a first conductive member. The second magnetic member is separated from the first magnetic member. The insulating member includes a first insulating region. The first insulating region is provided between the first and second magnetic members. The first wiring includes a first connecting region. The second wiring includes a second connecting region. The first magnetic element includes a first magnetic layer and a first opposed magnetic layer. The first magnetic element includes first to fifth partial regions. The first partial region is between the fourth and fifth partial regions. The second partial region is between the fourth and first partial region. The third partial region is between the first and fifth partial regions.
    Type: Application
    Filed: July 27, 2022
    Publication date: August 24, 2023
    Applicant: KABUSHIKI KAISHA TOSHIBA
    Inventors: Akira KIKITSU, Yoshihiro HIGASHI, Satoshi SHIROTORI
  • Publication number: 20230266411
    Abstract: According to one embodiment, a sensor includes an element portion and a controller. The element portion includes a first element. The first element includes a first magnetic element and a first conductive member. The first magnetic element includes a first magnetic layer and a first opposed magnetic layer. The first conductive member includes a first conductive portion and a first other conductive portion. The controller includes a first circuit. The first circuit is connected to the first conductive portion and the first other conductive portion. The first circuit is configured to supply a first current to the first conductive member. The first current includes an alternating current component. A local minimum value of the first current is of a first polarity, and a local maximum value of the first current is of the first polarity.
    Type: Application
    Filed: July 21, 2022
    Publication date: August 24, 2023
    Applicant: KABUSHIKI KAISHA TOSHIBA
    Inventors: Akira KIKITSU, Yoshihiro HIGASHI, Satoshi SHIROTORI
  • Patent number: 11726149
    Abstract: According to one embodiment, a magnetic sensor includes a base body including a base body end portion, a magnetic member, and an element part. A direction from the base body toward the magnetic member is along a first direction. The element part includes first and second magnetic elements. An orientation from the first magnetic element toward the second magnetic element is along a second direction crossing the first direction. A portion of the first magnetic element and a portion of the second magnetic element are between the base body and the magnetic member. A position in a third direction of an other portion of the first magnetic element and a position in the third direction of an other portion of the second magnetic element are between a position in the third direction of the base body end portion and a position in the third direction of the magnetic member.
    Type: Grant
    Filed: August 18, 2021
    Date of Patent: August 15, 2023
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Akira Kikitsu, Satoshi Shirotori, Yoshihiro Higashi, Yoshinari Kurosaki, Hitoshi Iwasaki
  • Patent number: 11710501
    Abstract: A magnetic head includes a first magnetic pole, a second magnetic pole, a magnetic element, and a magnetic member. The magnetic element is provided between the first and second magnetic poles, and includes a first magnetic layer. The magnetic member includes a first magnetic part. A second direction from the first magnetic part to the magnetic element crosses a first direction from the first to second magnetic pole. The first magnetic part includes a magnetic material including at least one of first to third materials. The first material includes at least one selected from the group consisting of Mn3Sn, Mn3Ge and Mn3Ga. The second material includes at least one selected from the group consisting of a cubic or tetragonal compound including Mn and Ni, a cubic alloy including ?-phase Mn, and a cubic alloy including Fe. The third material includes an antiferromagnet.
    Type: Grant
    Filed: January 28, 2022
    Date of Patent: July 25, 2023
    Assignees: KABUSHIKI KAISHA TOSHIBA, TOSHIBA ELECTRONIC DEVICES & STORAGE CORPORATION
    Inventors: Yuji Nakagawa, Naoyuki Narita, Masayuki Takagishi, Tomoyuki Maeda, Tazumi Nagasawa, Kenichiro Yamada, Akira Kikitsu
  • Patent number: 11703530
    Abstract: According to one embodiment, a sensor includes an element part, and a control circuit part. The element part includes first and second elements. Each of the first and second elements includes a first magnetic element and a first conductive member. The control circuit part includes a first current circuit, a differential circuit, and a phase detection circuit. The first current circuit is configured to supply a first current to the first conductive member. The differential circuit is configured to output a differential signal corresponding to a difference of a first signal and a second signal. The first signal corresponds to a change in a first electrical resistance of the first magnetic element of the first element. The second signal corresponds to a change in a second electrical resistance of the first magnetic element of the second element. The phase detection circuit is configured to perform a phase detection of the differential signal.
    Type: Grant
    Filed: February 15, 2022
    Date of Patent: July 18, 2023
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Akira Kikitsu, Satoshi Shirotori, Yoshihiro Higashi, Yoshinari Kurosaki