Patents by Inventor Toshihiko Nagase

Toshihiko Nagase 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).

  • Publication number: 20090140358
    Abstract: A magnetoresistive element includes a first ferromagnetic layer having a first magnetization, the first magnetization having a first pattern when the magnetoresistive element is half-selected during a first data write, a second pattern when the magnetoresistive element is selected during a second data write, and a third pattern of residual magnetization, the first pattern being different from the second and third pattern, a second ferromagnetic layer having a second magnetization, and a nonmagnetic layer arranged between the first ferromagnetic layer and the second ferromagnetic layer and having a tunnel conductance changing dependent on a relative angle between the first magnetization and the second magnetization.
    Type: Application
    Filed: February 2, 2009
    Publication date: June 4, 2009
    Inventors: Masahiko Nakayama, Tadashi Kai, Tatsuya Kishi, Yoshiaki Fukuzumi, Toshihiko Nagase, Sumio Ikegawa, Hiroaki Yoda
  • Patent number: 7518907
    Abstract: A magnetoresistive element includes a first ferromagnetic layer having a first magnetization, the first magnetization having a first pattern when the magnetoresistive element is half-selected during a first data write, a second pattern when the magnetoresistive element is selected during a second data write, and a third pattern of residual magnetization, the first pattern being different from the second and third pattern, a second ferromagnetic layer having a second magnetization, and a nonmagnetic layer arranged between the first ferromagnetic layer and the second ferromagnetic layer and having a tunnel conductance changing dependent on a relative angle between the first magnetization and the second magnetization.
    Type: Grant
    Filed: January 25, 2008
    Date of Patent: April 14, 2009
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Masahiko Nakayama, Tadashi Kai, Tatsuya Kishi, Yoshiaki Fukuzumi, Toshihiko Nagase, Sumio Ikegawa, Hiroaki Yoda
  • Publication number: 20090079018
    Abstract: A magnetoresistive element includes a first underlying layer having an NaCl structure and containing a nitride orienting in a (001) plane, a first magnetic layer provided on the first underlying layer, having magnetic anisotropy perpendicular to a film surface, having an L10 structure, and containing a ferromagnetic alloy orienting in a (001) plane, a first nonmagnetic layer provided on the first magnetic layer, and a second magnetic layer provided on the first nonmagnetic layer and having magnetic anisotropy perpendicular to a film surface.
    Type: Application
    Filed: September 18, 2008
    Publication date: March 26, 2009
    Inventors: Toshihiko Nagase, Masatoshi Yoshikawa, Eiji Kitagawa, Katsuya Nishiyama, Tadaomi Daibou, Tatsuya Kishi, Hiroaki Yoda
  • Publication number: 20090080124
    Abstract: A magnetoresistive element includes: a first magnetization reference layer having magnetization perpendicular to a film plane, a direction of the magnetization being invariable in one direction; a magnetization free layer having magnetization perpendicular to the film plane, a direction of the magnetization being variable; a first intermediate layer provided between the first magnetization reference layer and the magnetization free layer; a magnetic phase transition layer provided on an opposite side of the magnetization free layer from the first intermediate layer, the magnetic phase transition layer being magnetically coupled to the magnetization free layer, and being capable of bidirectionally performing a magnetic phase transition between an antiferromagnetic material and a ferromagnetic material; and an excitation layer provided on an opposite side of the magnetic phase transition layer from the magnetization free layer, and causing the magnetic phase transition layer to perform the magnetic phase transi
    Type: Application
    Filed: September 15, 2008
    Publication date: March 26, 2009
    Applicant: KABUSHIKI KAISHA TOSHIBA
    Inventors: Masatoshi Yoshikawa, Tadaomi Daibou, Eiji Kitagawa, Toshihiko Nagase, Tatsuya Kishi, Hiroaki Yoda
  • Publication number: 20090080238
    Abstract: The present invention provides a low-resistance magnetoresistive element of a spin-injection write type. A crystallization promoting layer that promotes crystallization is formed in contact with an interfacial magnetic layer having an amorphous structure, so that crystallization is promoted from the side of a tunnel barrier layer, and the interface between the tunnel barrier layer and the interfacial magnetic layer is adjusted. With this arrangement, it is possible to form a magnetoresistive element that has a low resistance so as to obtain a desired current value, and has a high TMR ratio.
    Type: Application
    Filed: September 16, 2008
    Publication date: March 26, 2009
    Applicant: KABUSHIKI KAISHA TOSHIBA
    Inventors: Masatoshi YOSHIKAWA, Eiji Kitagawa, Tadaomi Daibou, Toshihiko Nagase, Tatsuya Kishi, Hiroaki Yoda
  • Publication number: 20090080239
    Abstract: A magnetoresistive element includes a first reference layer having magnetic anisotropy perpendicular to a film surface, and an invariable magnetization, a recording layer having a stacked structure formed by alternately stacking magnetic layers and nonmagnetic layers, magnetic anisotropy perpendicular to a film surface, and a variable magnetization, and an intermediate layer provided between the first reference layer and the recording layer, and containing a nonmagnetic material. The magnetic layers include a first magnetic layer being in contact with the intermediate layer and a second magnetic layer being not in contact with the intermediate layer. The first magnetic layer contains an alloy containing cobalt (Co) and iron (Fe), and has a film thickness larger than that of the second magnetic layer.
    Type: Application
    Filed: September 18, 2008
    Publication date: March 26, 2009
    Inventors: Toshihiko Nagase, Katsuya Nishiyama, Tadashi Kai, Masahiko Nakayama, Makoto Nagamine, Minoru Amano, Masatoshi Yoshikawa, Tatsuya Kishi, Hiroaki Yoda
  • Patent number: 7505306
    Abstract: A magnetic memory device includes a magnetization fixed layer provided above a semiconductor substrate surface and having a fixed magnetization direction. A first magnetization free layer is provided above the magnetization fixed layer, has variable magnetization direction, and has an easy magnetization axis extending along a plane intersecting the substrate surface and along a direction neither parallel nor perpendicular to the substrate surface. A second magnetization free layer is provided above the first magnetization free layer, has a magnetization that antiferromagnetically couples with the first magnetization free layer. A first write line is placed above and electrically connected to the second magnetization free layer, and extends in a direction that pierces the plane. A second write line faces the first and/or second magnetization free layer, and extends along the substrate surface and the plane and in a direction perpendicular to the first write line.
    Type: Grant
    Filed: December 12, 2006
    Date of Patent: March 17, 2009
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Yoshiaki Fukuzumi, Toshihiko Nagase, Yoshiaki Asao
  • Patent number: 7474554
    Abstract: A magnetoresistance effect device includes a magnetized free layer formed of a ferromagnetic material, a magnetized fixing layer formed of a ferromagnetic material and having a crystal grain boundary, a nonmagnetic layer provided between the magnetized free layer and the magnetized fixing layer, and an antiferromagnetic layer provided on one surface of the magnetized fixing layer, which is opposed to a surface of the nonmagnetic layer. The magnetized fixing layer has an element which is segregated into the crystal grain boundary to prevent a material of the antiferromagnetic layer from diffusing.
    Type: Grant
    Filed: November 7, 2007
    Date of Patent: January 6, 2009
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Katsuya Nishiyama, Toshihiko Nagase
  • Patent number: 7459759
    Abstract: A magnetic random access memory described in embodiments of the present invention comprises a conductive line, a soft magnetic material which surrounds the conductive line, a gap disposed in a part of the soft magnetic material, and a magneto-resistive element in which a part of a vertical magnetization film as a magnetic free layer is positioned in the gap and in which a vertical magnetization film as a magnetic pinned layer is positioned outside the gap.
    Type: Grant
    Filed: June 6, 2006
    Date of Patent: December 2, 2008
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Yoshiaki Fukuzumi, Toshihiko Nagase
  • Publication number: 20080291585
    Abstract: It is made possible to provide a magnetoresistive effect element that can reverse magnetization direction with a low current, having low areal resistance (RA) and a high TMR ratio. A magnetoresistive effect element includes: a film stack that includes a magnetization free layer including a magnetic layer in which magnetization direction is changeable, a magnetization pinned layer including a magnetic layer in which magnetization direction is pinned, and an intermediate layer provided between the magnetization free layer and the magnetization pinned layer, the intermediate layer being an oxide containing boron (B) and an element selected from the group consisting of Ca, Mg, Sr, Ba, Ti, and Sc. Current is applied bidirectionally between the magnetization pinned layer and the magnetization free layer through the intermediate layer, so that the magnetization of the magnetization free layer is reversible.
    Type: Application
    Filed: August 23, 2007
    Publication date: November 27, 2008
    Applicant: KABUSHIKI KAISHA TOSHIBA
    Inventors: Masatoshi Yoshikawa, Tadashi Kai, Toshihiko Nagase, Eiji Kitagawa, Tatsuya Kishi, Hiroaki Yoda
  • Patent number: 7455951
    Abstract: A phase change recording medium comprising an as-deposited first recording layer configured to undergo a reversible phase change between an amorphous state and a crystalline state due to light irradiation and thereby change an optical characteristic. The as-deposited first recording layer includes a plurality of fine nuclei having an average size of 0.5 nm to 4 nm in the amorphous state.
    Type: Grant
    Filed: March 27, 2006
    Date of Patent: November 25, 2008
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Katsutaro Ichihara, Sumio Ashida, Keiichiro Yusu, Toshihiko Nagase, Naomasa Nakamura
  • Publication number: 20080253174
    Abstract: A magnetoresistive effect element includes a first magnetic layer, a second magnetic layer, and a first spacer layer. The first magnetic layer has an invariable magnetization direction. The second magnetic layer has a variable magnetization direction, and contains at least one element selected from Fe, Co, and Ni, at least one element selected from Ru, Rh, Pd, Ag, Re, Os, Ir, Pt, and Au, and at least one element selected from V, Cr, and Mn. The spacer layer is formed between the first magnetic layer and the second magnetic layer, and made of a nonmagnetic material. A bidirectional electric current flowing through the first magnetic layer, the spacer layer, and the second magnetic layer makes the magnetization direction of the second magnetic layer variable.
    Type: Application
    Filed: March 13, 2008
    Publication date: October 16, 2008
    Inventors: Masatoshi YOSHIKAWA, Eiji Kitagawa, Tadashi Kai, Toshihiko Nagase, Tatsuya Kishi, Hiroaki Yoda
  • Publication number: 20080241598
    Abstract: A magnetic random access memory in which a plurality of magnetoresistive elements are laid out in an array, the magnetoresistive element includes a lower ferromagnetic layer, an upper ferromagnetic layer which has a planar shape smaller than a planar shape of the lower ferromagnetic layer, a first nonmagnetic insulating layer which is formed between the lower ferromagnetic layer and the upper ferromagnetic layer, and a first nonmagnetic metal layer which is formed between the first nonmagnetic insulating layer and the upper ferromagnetic layer.
    Type: Application
    Filed: April 29, 2008
    Publication date: October 2, 2008
    Inventors: Yoshiaki Fukuzumi, Toshihiko Nagase
  • Publication number: 20080231998
    Abstract: A magnetoresistive effect element includes a magnetization fixed layer having substantially fixed magnetization direction. A magnetization variable layer has a variable magnetization direction, consists of a magnetic alloy that has a BCC structure and is expressed by Fe1-x-yCoxNiy (0?x+y?1, 0?x?1, 0?y?1), and contains at least one additive element of V, Cr, and Mn in a range of 0<a?20 at % (a is a content). An intermediate layer is disposed between the magnetization fixed layer and the magnetization variable layer and consists of a nonmagnetic material. The magnetization direction of the magnetization variable layer is switched by a bidirectional current passing through the magnetization fixed layer, the intermediate layer, and the magnetization variable layer.
    Type: Application
    Filed: September 20, 2007
    Publication date: September 25, 2008
    Inventors: Masatoshi YOSHIKAWA, Tadashi Kai, Toshihiko Nagase, Eiji Kitagawa, Tatsuya Kishi, Hiroaki Yoda
  • Publication number: 20080225577
    Abstract: A magnetic random access memory includes a bit line running in a first direction, a first word line running in a second direction different from the first direction, and a memory element having a magnetoresistive effect element including a fixed layer having a fixed magnetization direction, a recording layer having a reversible magnetization direction, and a nonmagnetic layer formed between the fixed layer and the recording layer, the magnetization directions in the fixed layer and the recording layer being perpendicular to a film surface, and a heater layer in contact with the magnetoresistive effect element, the memory element being connected to the bit line, and formed to oppose a side surface of the first word line such that the memory element is insulated from the first word line.
    Type: Application
    Filed: March 6, 2008
    Publication date: September 18, 2008
    Inventors: Keiji HOSOTANI, Yoshiaki Asao, Toshihiko Nagase
  • Publication number: 20080131732
    Abstract: A magnetoresistive element includes a first ferromagnetic layer having a first magnetization, the first magnetization having a first pattern when the magnetoresistive element is half-selected during a first data write, a second pattern when the magnetoresistive element is selected during a second data write, and a third pattern of residual magnetization, the first pattern being different from the second and third pattern, a second ferromagnetic layer having a second magnetization, and a nonmagnetic layer arranged between the first ferromagnetic layer and the second ferromagnetic layer and having a tunnel conductance changing dependent on a relative angle between the first magnetization and the second magnetization.
    Type: Application
    Filed: January 25, 2008
    Publication date: June 5, 2008
    Inventors: Masahiko NAKAYAMA, Tadashi Kai, Tatsuya Kishi, Yoshiaki Fukuzumi, Toshihiko Nagase, Sumio Ikegawa, Hiroaki Yoda
  • Publication number: 20080114043
    Abstract: A medicinal composition for inhalation containing a continuous-release type prodrug of an EP2 agonist topically exhibits a prolonged bronchodilating and antiinflammatory effects. Namely, the medicinal composition for inhalation containing a continuous-release type prodrug of an EP2 agonist is useful as a safe preventive and/or a remedy for respiratory diseases (for example, asthma, pulmonary injury, pulmonary fibrosis, pulmonary emphysema, bronchitis, chronic obstructive pulmonary disease, adult respiratory distress syndrome, cystic fibrosis, pulmonary hypertension or the like) without causing any systemic effect such as lowering blood pressure. Thus, a safe and useful remedy for respiratory diseases is provided.
    Type: Application
    Filed: October 21, 2005
    Publication date: May 15, 2008
    Applicant: ONO PHARMACEUTICAL CO., LTD
    Inventors: Shigeki Yamamoto, Tsutomu Shiroya, Michiaki Kadode, Toru Maruyama, Kousuke Tani, Toshihiko Nagase
  • Patent number: 7372648
    Abstract: A pair of members opposed to each other via a gap are commonly used as an evanescent light probe and a writing magnetic head. When the spacing and width of the gap are smaller than the wavelength ? of injected light, highly intensive evanescent light is generated from the gap position of the opposite surface. Magnetic writing is carried out by applying a recording magnetic field from the pair of members to a medium heated by the evanescent light.
    Type: Grant
    Filed: August 18, 2004
    Date of Patent: May 13, 2008
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Junichi Akiyama, Akira Kikitsu, Tadashi Kai, Toshihiko Nagase, Tomoyuki Maeda
  • Publication number: 20080088980
    Abstract: A magnetoresistive element includes a free layer which contains a magnetic material and has an fct crystal structure with a (001) plane oriented, the free layer having a magnetization which is perpendicular to a film plane and has a direction to be changeable by spin-polarized electrons, a first nonmagnetic layer and a second nonmagnetic layer which sandwich the free layer and have one of a tetragonal crystal structure and a cubic crystal structure, and a fixed layer which is provided on only one side of the free layer and on a surface of the first nonmagnetic layer opposite to a surface with the free layer and contains a magnetic material, the fixed layer having a magnetization which is perpendicular to a film plane and has a fixed direction.
    Type: Application
    Filed: August 1, 2007
    Publication date: April 17, 2008
    Inventors: Eiji KITAGAWA, Toshihiko Nagase, Masatoshi Yoshikawa, Katsuya Nishiyama, Tatsuya Kishi, Hiroaki Yoda
  • Patent number: 7355884
    Abstract: A magnetoresistive element includes a first ferromagnetic layer having a first magnetization, the first magnetization having a first pattern when the magnetoresistive element is half-selected during a first data write, a second pattern when the magnetoresistive element is selected during a second data write, and a third pattern of residual magnetization, the first pattern being different from the second and third pattern, a second ferromagnetic layer having a second magnetization, and a nonmagnetic layer arranged between the first ferromagnetic layer and the second ferromagnetic layer and having a tunnel conductance changing dependent on a relative angle between the first magnetization and the second magnetization.
    Type: Grant
    Filed: October 7, 2005
    Date of Patent: April 8, 2008
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Masahiko Nakayama, Tadashi Kai, Tatsuya Kishi, Yoshiaki Fukuzumi, Toshihiko Nagase, Sumio Ikegawa, Hiroaki Yoda