Patents by Inventor Hirofumi Suto
Hirofumi Suto 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).
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Publication number: 20200327901Abstract: According to one embodiment, a magnetic head includes a magnetic pole, a first shield, and a stacked body. The stacked body is provided between the magnetic pole and the first shield. The stacked body includes a magnetic layer including at least one selected from the group consisting of Fe, Co, and Ni, a first conductive layer provided between the magnetic pole and the magnetic layer, the first conductive layer being nonmagnetic, and a second conductive layer provided between the magnetic layer and the first shield, the second conductive layer being nonmagnetic. The first conductive layer includes Ir. A thickness of the first conductive layer along a first direction is not less than 0.3 nm and not more than 0.8 nm. The first direction is from the first conductive layer toward the second conductive layer.Type: ApplicationFiled: June 28, 2020Publication date: October 15, 2020Applicant: KABUSHIKI KAISHA TOSHIBAInventors: Naoyuki NARITA, Hirofumi SUTO, Tomoyuki MAEDA
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Publication number: 20200294537Abstract: According to one embodiment, a magnetic head includes a shield, a magnetic pole, a first magnetic layer provided between the shield and the magnetic pole, a second magnetic layer provided between the first magnetic layer and the magnetic pole, a third magnetic layer provided between the second magnetic layer and the magnetic pole, a first nonmagnetic layer provided between the shield and the first magnetic layer, a second nonmagnetic layer provided between the first magnetic layer and the second magnetic layer, a third nonmagnetic layer provided between the second magnetic layer and the third magnetic layer, and a fourth nonmagnetic layer provided between the third magnetic layer and the magnetic pole. The first and third nonmagnetic layers include one of Cu, Ag, Au, Al, and Ti. The second and fourth nonmagnetic layers include one of Ta, Pt, Ir, W, Mo, Cr, Tb, Rh, Pd, and Ru.Type: ApplicationFiled: September 10, 2019Publication date: September 17, 2020Applicants: KABUSHIKI KAISHA TOSHIBA, TOSHIBA ELECTRONIC DEVICES & STORAGE CORPORATIONInventors: Tazumi NAGASAWA, Naoyuki Narita, Hirofumi Suto, Massayuki Takagishi, Tomoyuki Maeda
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Patent number: 10734017Abstract: According to one embodiment, a magnetic head includes a magnetic pole, a first shield, and a stacked body. The stacked body is provided between the magnetic pole and the first shield. The stacked body includes a magnetic layer including at least one selected from the group consisting of Fe, Co, and Ni, a first conductive layer provided between the magnetic pole and the magnetic layer, the first conductive layer being nonmagnetic, and a second conductive layer provided between the magnetic layer and the first shield, the second conductive layer being nonmagnetic. The first conductive layer includes Ir. A thickness of the first conductive layer along a first direction is not less than 0.3 nm and not more than 0.8 nm. The first direction is from the first conductive layer toward the second conductive layer.Type: GrantFiled: March 8, 2019Date of Patent: August 4, 2020Assignee: Kabushiki Kaisha ToshibaInventors: Naoyuki Narita, Hirofumi Suto, Tomoyuki Maeda
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Publication number: 20200168244Abstract: According to one embodiment, a magnetic head includes a magnetic pole, a first shield, a magnetic layer, first and second conductive layers. The magnetic layer is provided between the magnetic pole and the first shield. The first conductive layer contacts the first shield and the magnetic layer, is provided between the first shield and the magnetic layer, and includes at least one selected from Cu, Ag, and Au. The second conductive layer is provided between the magnetic pole and the magnetic layer. The second conductive layer includes first and second regions. The first region contacts the magnetic layer and includes at least one first element selected from Cu, Ag, Au, Al, Ti, Ru, Mg, and V. The second region is provided between the first region and the magnetic pole and includes at least one second element selected from Ta, Pt, W, Mo, Ir, Cr, Tb, Rh, and Pd.Type: ApplicationFiled: August 27, 2019Publication date: May 28, 2020Applicants: KABUSHIKI KAISHA TOSHIBA, TOSHIBA ELECTRONIC DEVICES & STORAGE CORPORATIONInventors: Hirofumi SUTO, Naoyuki NARITA, Tazumi NAGASAWA, Masayuki TAKAGISHI, Tomoyuki MAEDA
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Publication number: 20200082845Abstract: According to one embodiment, a magnetic head includes a magnetic pole, a first shield, a magnetic layer, a first conductive layer, and a second conductive layer. The magnetic layer is provided between the magnetic pole and the first shield. The first conductive layer includes at least one of Cu, Ag, Au, Al and Cr, and is provided between the magnetic pole and the first shield. A direction from the first conductive layer toward the magnetic layer crosses a first direction from the magnetic pole toward the first shield. A second conductive layer includes at least one of Ta, Pt, W, Ru, Mo, Ir, Rh, and Pd and is provided at one of a first position or a second position. The first position is between the first conductive layer and the first shield. The second position is between the magnetic pole and the first conductive layer.Type: ApplicationFiled: March 12, 2019Publication date: March 12, 2020Applicants: KABUSHIKI KAISHA TOSHIBA, TOSHIBA ELECTRONIC DEVICES & STORAGE CORPORATIONInventors: Hirofumi SUTO, Naoyuki NARITA, Tazumi NAGASAWA, Masayuki TAKAGISHI, Tomoyuki MAEDA
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Publication number: 20200058322Abstract: According to one embodiment, a magnetic head includes a magnetic pole, a first shield, and a stacked body. The stacked body is provided between the magnetic pole and the first shield. The stacked body includes a magnetic layer including at least one selected from the group consisting of Fe, Co, and Ni, a first conductive layer provided between the magnetic pole and the magnetic layer, the first conductive layer being nonmagnetic, and a second conductive layer provided between the magnetic layer and the first shield, the second conductive layer being nonmagnetic. The first conductive layer includes Ir. A thickness of the first conductive layer along a first direction is not less than 0.3 nm and not more than 0.8 nm. The first direction is from the first conductive layer toward the second conductive layer.Type: ApplicationFiled: March 8, 2019Publication date: February 20, 2020Applicant: KABUSHIKI KAISHA TOSHIBAInventors: Naoyuki NARITA, Hirofumi SUTO, Tomoyuki MAEDA
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Patent number: 10522172Abstract: According to one embodiment, an oscillator includes a first element. The first element includes first and second magnetic layers, and a first nonmagnetic layer. The first magnetic layer includes first and second magnetic films, and a first nonmagnetic film. The second magnetic film is provided between the second magnetic layer and the first magnetic film. The first nonmagnetic layer is provided between the second magnetic film and the second magnetic layer. An orientation of a first magnetization of the first magnetic film has a reverse component of an orientation of a second magnetization of the second magnetic film. A first magnetic field is applied to the first element. The first element is in a first state when a first current flows in the first element. An electrical resistance of the first element in the first state includes first and second electrical resistances repeating alternately.Type: GrantFiled: March 15, 2018Date of Patent: December 31, 2019Assignee: Kabushiki Kaisha ToshibaInventors: Tazumi Nagasawa, Hirofumi Suto, Michinaga Yamagishi, Taro Kanao, Koichi Mizushima
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Patent number: 10424325Abstract: According to one embodiment, a magnetic head includes a first magnetic layer, a second magnetic layer, an intermediate layer, a magnetic pole, a first terminal, and a second terminal. The second magnetic layer is separated from the first magnetic layer in a first direction. The intermediate layer is provided between the first magnetic layer and the second magnetic layer. A second direction from the first magnetic layer toward the magnetic pole crosses the first direction. The first terminal is electrically connected to the intermediate layer. The second terminal is electrically connected to the second magnetic layer.Type: GrantFiled: August 31, 2017Date of Patent: September 24, 2019Assignee: Kabushiki Kaisha ToshibaInventors: Hirofumi Suto, Kiwamu Kudo, Tazumi Nagasawa, Taro Kanao, Rie Sato, Koichi Mizushima
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Patent number: 10210894Abstract: According to one embodiment, a magnetic recording medium includes a first layer and a second layer. The first layer includes a first magnetic region, a second magnetic region, and a nonmagnetic region provided between the first and second magnetic regions. A direction from the second magnetic region toward the first magnetic region is along a first direction. The second layer includes third, fourth, and fifth magnetic regions. At least a portion of the fifth magnetic region is provided between the third and fourth magnetic regions. The third magnetic region overlaps the first magnetic region in a second direction crossing the first direction. The fourth magnetic region overlaps the second magnetic region in the second direction. The fifth magnetic region overlaps the nonmagnetic region in the second direction. An easy magnetization axis of each of the first to fifth magnetic regions is aligned with the second direction.Type: GrantFiled: February 15, 2018Date of Patent: February 19, 2019Assignee: Kabushiki Kaisha ToshibaInventors: Hirofumi Suto, Taro Kanao, Tazumi Nagasawa, Rie Sato, Koichi Mizushima
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Publication number: 20180374502Abstract: According to one embodiment, an oscillator includes a first element. The first element includes first and second magnetic layers, and a first nonmagnetic layer. The first magnetic layer includes first and second magnetic films, and a first nonmagnetic film. The second magnetic film is provided between the second magnetic layer and the first magnetic film. The first nonmagnetic layer is provided between the second magnetic film and the second magnetic layer. An orientation of a first magnetization of the first magnetic film has a reverse component of an orientation of a second magnetization of the second magnetic film. A first magnetic field is applied to the first element. The first element is in a first state when a first current flows in the first element An electrical resistance of the first element in the first state includes first and second electrical resistances repeating alternately.Type: ApplicationFiled: March 15, 2018Publication date: December 27, 2018Applicant: KABUSHIKI KAISHA TOSHIBAInventors: Tazumi NAGASAWA, Hirofumi SUTO, Michinaga YAMAGISHI, Taro KANAO, Koichi MIZUSHIMA
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Patent number: 10127931Abstract: According to one embodiment, a magnetic recording and reproducing device includes a magnetic recording medium, a magnetic head, and a controller. The controller implements a first operation and a second operation. The first operation is implemented in a first information recording interval including a first recording interval and a first non-recording interval. The second operation is implemented in a second information recording interval including a second recording interval and a second non-recording interval. The first operation includes in the first recording interval, generating a first signal magnetic field from the magnetic head, and in the first non-recording interval, generating a first non-signal magnetic field from the magnetic head. The second operation includes in the second recording interval, generating a second signal magnetic field from the magnetic head, and in the second non-recording interval, generating a second non-signal magnetic field from the magnetic head.Type: GrantFiled: September 15, 2016Date of Patent: November 13, 2018Assignee: Kabushiki Kaisha ToshibaInventors: Hirofumi Suto, Kiwamu Kudo, Tazumi Nagasawa, Taro Kanao, Rie Sato, Koichi Mizushima
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Publication number: 20180267087Abstract: According to one embodiment, a microwave sensor includes a first stacked body and a first controller. The first stacked body includes a first magnetic layer, a second magnetic layer, and a first nonmagnetic layer. The first nonmagnetic layer is provided between the first magnetic layer and the second magnetic layer. The first controller is electrically connected to the first magnetic layer and the second magnetic layer. The first controller is configured to supply a current to the first stacked body and is configured to sense a value corresponding to a first electrical resistance between the first magnetic layer and the second magnetic layer. A second magnetization of the second magnetic layer is aligned with a first direction from the first magnetic layer toward the second magnetic layer. The value corresponding to the first electrical resistance changes according to a microwave.Type: ApplicationFiled: September 15, 2017Publication date: September 20, 2018Applicant: KABUSHIKI KAISHA TOSHIBAInventors: Tazumi NAGASAWA, Hirofumi SUTO, Michinaga YAMAGISHI, Taro KANAO, Kiwamu KUDO, Koichi MIZUSHIMA
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Publication number: 20180204589Abstract: According to one embodiment, a magnetic head includes a first magnetic layer, a second magnetic layer, an intermediate layer, a magnetic pole, a first terminal, and a second terminal. The second magnetic layer is separated from the first magnetic layer in a first direction. The intermediate layer is provided between the first magnetic layer and the second magnetic layer. A second direction from the first magnetic layer toward the magnetic pole crosses the first direction. The first terminal is electrically connected to the intermediate layer. The second terminal is electrically connected to the second magnetic layer.Type: ApplicationFiled: August 31, 2017Publication date: July 19, 2018Applicant: KABUSHIKI KAISHA TOSHIBAInventors: Hirofumi SUTO, Kiwamu KUDO, Tazumi NAGASAWA, Taro KANAO, Rie SATO, Koichi MIZUSHIMA
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Patent number: 10027334Abstract: According to an embodiment, a computing apparatus includes spin torque oscillators, an interaction unit, a variable direct-current supply device, and a measuring unit. The interaction unit controls an interaction between the spin torque oscillators. The variable direct-current supply device supplies a current to induce oscillations of the spin torque oscillators. The measuring unit measures AC signals obtained from the spin torque oscillators.Type: GrantFiled: September 9, 2016Date of Patent: July 17, 2018Assignee: Kabushiki Kaisha ToshibaInventors: Taro Kanao, Tazumi Nagasawa, Hayato Goto, Kiwamu Kudo, Hirofumi Suto, Michinaga Yamagishi, Koichi Mizushima, Rie Sato
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Patent number: 9984723Abstract: A magnetic recording and reproducing apparatus for recording and reproducing bit information comprising a magnetic head having a spin torque oscillator configured to readout bit information which is recorded on a magnetic recording medium, a detector configured to detect amplitude of a first signal, the first signal which is to reproduce the bit information, and a controller configured to control the magnetic head so as to read the bit information recorded on the magnetic recording medium when the amplitude of the first signal detected by the detector is smaller than a predetermined value.Type: GrantFiled: February 28, 2017Date of Patent: May 29, 2018Assignee: Kabushiki Kaisha ToshibaInventors: Tazumi Nagasawa, Taro Kanao, Michinaga Yamagishi, Hirofumi Suto, Kiwamu Kudo, Rie Sato, Koichi Mizushima
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Patent number: 9911438Abstract: According to one embodiment, a magnetic recording and reproducing device includes a magnetic recording medium, and a magnetic head including a first reproducing unit. The first reproducing unit includes a first magnetic field generator separated from the magnetic recording medium in a first direction, and a first stacked body. At least a portion of the first stacked body is provided between the magnetic recording medium and the first magnetic field generator in the first direction. The first stacked body includes a first magnetic layer, a second magnetic layer separated from the first magnetic layer in a second direction crossing the first direction, and a first intermediate layer provided between the first magnetic layer and the second magnetic layer. The first stacked body performs an operation of generating a first alternating magnetic field. The first magnetic field generator generates a first magnetic field.Type: GrantFiled: February 21, 2017Date of Patent: March 6, 2018Assignee: Kabushiki Kaisha ToshibaInventors: Taro Kanao, Hirofumi Suto, Koichi Mizushima, Rie Sato
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Publication number: 20170352367Abstract: According to one embodiment, a magnetic recording and reproducing device includes a magnetic recording medium, and a magnetic head including a first reproducing unit. The first reproducing unit includes a first magnetic field generator separated from the magnetic recording medium in a first direction, and a first stacked body. At least a portion of the first stacked body is provided between the magnetic recording medium and the first magnetic field generator in the first direction. The first stacked body includes a first magnetic layer, a second magnetic layer separated from the first magnetic layer in a second direction crossing the first direction, and a first intermediate layer provided between the first magnetic layer and the second magnetic layer. The first stacked body performs an operation of generating a first alternating magnetic field. The first magnetic field generator generates a first magnetic field.Type: ApplicationFiled: February 21, 2017Publication date: December 7, 2017Inventors: Taro Kanao, Hirofumi Suto, Koichi Mizushima, Rie Sato
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Publication number: 20170294207Abstract: A magnetic recording and reproducing apparatus for recording and reproducing bit information comprising a magnetic head having a spin torque oscillator configured to readout bit information which is recorded on a magnetic recording medium, a detector configured to detect amplitude of a first signal, the first signal which is to reproduce the bit information, and a controller configured to control the magnetic head so as to read the bit information recorded on the magnetic recording medium when the amplitude of the first signal detected by the detector is smaller than a predetermined value.Type: ApplicationFiled: February 28, 2017Publication date: October 12, 2017Applicant: Kabushiki Kaisha ToshibaInventors: Tazumi NAGASAWA, Taro KANAO, Michinaga YAMAGISHI, Hirofumi SUTO, Kiwamu KUDO, Rie SATO, Koichi MIZUSHIMA
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Publication number: 20170272087Abstract: According to an embodiment, a computing apparatus includes spin torque oscillators, an interaction unit, a variable direct-current supply device, and a measuring unit. The interaction unit controls an interaction between the spin torque oscillators. The variable direct-current supply device supplies a current to induce oscillations of the spin torque oscillators. The measuring unit measures AC signals obtained from the spin torque oscillators.Type: ApplicationFiled: September 9, 2016Publication date: September 21, 2017Inventors: Taro KANAO, Tazumi NAGASAWA, Hayato GOTO, Kiwamu KUDO, Hirofumi SUTO, Michinaga YAMAGISHI, Koichi MIZUSHIMA, Rie SATO
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Publication number: 20170256273Abstract: According to one embodiment, a magnetic recording and reproducing device includes a magnetic recording medium, a magnetic head, and a controller. The controller implements a first operation and a second operation. The first operation is implemented in a first information recording interval including a first recording interval and a first non-recording interval. The second operation is implemented in a second information recording interval including a second recording interval and a second non-recording interval. The first operation includes in the first recording interval, generating a first signal magnetic field from the magnetic head, and in the first non-recording interval, generating a first non-signal magnetic field from the magnetic head. The second operation includes in the second recording interval, generating a second signal magnetic field from the magnetic head, and in the second non-recording interval, generating a second non-signal magnetic field from the magnetic head.Type: ApplicationFiled: September 15, 2016Publication date: September 7, 2017Inventors: Hirofumi SUTO, Kiwamu KUDO, Koichi MIZUSHIMA, Tazumi NAGASAWA, Taro KANAO, Rie SATO