Patents by Inventor Kenta HAMAMOTO

Kenta HAMAMOTO 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: 9129622
    Abstract: A magnetoresistive effect element that prevents a recording medium from deteriorating by effectively inhibiting erroneous writing to a medium or the like includes a magnetoresistive effect part, and an upper shield layer and a lower shield layer that are laminated and formed in a manner sandwiching the magnetoresistive effect part from above and below, and is in a current perpendicular to plane (CPP) structure in which a sense current is applied in a lamination direction.
    Type: Grant
    Filed: March 15, 2013
    Date of Patent: September 8, 2015
    Assignee: TDK Corporation
    Inventors: Takahiko Machita, Naomichi Degawa, Takekazu Yamane, Takumi Yanagisawa, Satoshi Miura, Kenta Hamamoto, Minoru Ota, Kenzo Makino, Shohei Kawasaki
  • Patent number: 8913349
    Abstract: An MR element includes an MR part and upper and lower shield layers in a CPP structure. The MR element has side shield layers so as to interpose the MR part between the side shield layers in a track width direction. The MR part comprises a nonmagnetic intermediate layer and first and second ferromagnetic layers so as to interpose the nonmagnetic intermediate layer between the ferromagnetic layers. Each of the upper and lower shield layers has an inclined magnetization structure such that its magnetization is inclined relative to the track width direction. The side shield layers are magnetically coupled with the upper shield layer, respectively. The second ferromagnetic layer is indirectly magnetically coupled with the lower shield layer via an exchange-coupling functional gap layer. The side shield layer applies a bias magnetic field to the first ferromagnetic layer; and magnetizations of the first and second ferromagnetic layers are substantially orthogonal.
    Type: Grant
    Filed: March 29, 2013
    Date of Patent: December 16, 2014
    Assignee: TDK Corporation
    Inventors: Takekazu Yamane, Takahiko Machita, Naomichi Degawa, Minoru Ota, Kenta Hamamoto
  • Patent number: 8891208
    Abstract: An MR element suppressing a false writing into a medium with an MR part has a CPP structure. The MR part includes a nonmagnetic intermediate layer and first and second ferromagnetic layers so as to interpose the nonmagnetic intermediate layer. First and second shield layers respectively have an inclining magnetization structure of which a magnetization is inclined with regard to a track width direction. The first and second ferromagnetic layers are respectively, magnetically coupled with the first and second shield layers. A magnetization direction adjustment layer for adjusting at least a magnetization direction of the first ferromagnetic layer is positioned at a rear end surface side of the first ferromagnetic layer, which is opposite to a front end surface receiving a magnetic field detected in the MR part.
    Type: Grant
    Filed: March 29, 2013
    Date of Patent: November 18, 2014
    Assignee: TDK Corporation
    Inventors: Naomichi Degawa, Takahiko Machita, Takekazu Yamane, Takumi Yanagisawa, Satoshi Miura, Kenta Hamamoto, Minoru Ota, Kenzo Makino, Shohei Kawasaki
  • Publication number: 20140293474
    Abstract: An MR element includes an MR part and upper and lower shield layers in a CPP structure. The MR element has side shield layers so as to interpose the MR part between the side shield layers in a track width direction. The MR part comprises a nonmagnetic intermediate layer and first and second ferromagnetic layers so as to interpose the nonmagnetic intermediate layer between the ferromagnetic layers. Each of the upper and lower shield layers has an inclined magnetization structure such that its magnetization is inclined relative to the track width direction. The side shield layers are magnetically coupled with the upper shield layer, respectively. The second ferromagnetic layer is indirectly magnetically coupled with the lower shield layer via an exchange-coupling functional gap layer. The side shield layer applies a bias magnetic field to the first ferromagnetic layer; and magnetizations of the first and second ferromagnetic layers are substantially orthogonal.
    Type: Application
    Filed: March 29, 2013
    Publication date: October 2, 2014
    Applicant: TDK CORPORATION
    Inventors: Takekazu YAMANE, Takahiko MACHITA, Naomichi DEGAWA, Minoru OTA, Kenta HAMAMOTO
  • Publication number: 20140293475
    Abstract: An MR element suppressing a false writing into a medium with an MR part has a CPP structure. The MR part includes a nonmagnetic intermediate layer and first and second ferromagnetic layers so as to interpose the nonmagnetic intermediate layer. First and second shield layers respectively have an inclining magnetization structure of which a magnetization is inclined with regard to a track width direction. The first and second ferromagnetic layers are respectively, magnetically coupled with the first and second shield layers. A magnetization direction adjustment layer for adjusting at least a magnetization direction of the first ferromagnetic layer is positioned at a rear end surface side of the first ferromagnetic layer, which is opposite to a front end surface receiving a magnetic field detected in the MR part.
    Type: Application
    Filed: March 29, 2013
    Publication date: October 2, 2014
    Inventors: Naomichi DEGAWA, Takahiko MACHITA, Takekazu YAMANE, Takumi YANAGISAWA, Satoshi MIURA, Kenta HAMAMOTO, Minoru OTA, Kenzo MAKINO, Shohei KAWASAKI
  • Publication number: 20140268405
    Abstract: A magnetoresistive effect element that prevents a recording medium from deteriorating by effectively inhibiting erroneous writing to a medium or the like includes a magnetoresistive effect part, and an upper shield layer and a lower shield layer that are laminated and formed in a manner sandwiching the magnetoresistive effect part from above and below, and is in a current perpendicular to plane (CPP) structure in which a sense current is applied in a lamination direction.
    Type: Application
    Filed: March 15, 2013
    Publication date: September 18, 2014
    Inventors: Takahiko MACHITA, Naomichi DEGAWA, Takekazu YAMANE, Takumi YANAGISAWA, Satoshi MIURA, Kenta HAMAMOTO, Minoru OTA, Kenzo MAKINO, Shohei KAWASAKI