Patents by Inventor Yusuke Tomoda
Yusuke Tomoda 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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Patent number: 10037769Abstract: According to one embodiment, a magnetic disk device includes a disk, a head including a main pole configured to apply a recording magnetic field to the disk, and side shields provided in a first direction with respect to the main pole and possessing a magnetic field in the magnetization direction of the first direction, and a controller configured to output a recording current in which a magnitude of a first electric current and a magnitude of a second electric current opposite to the first electric current in direction of the current are different from each other to the head according to the magnetic field of the side shields.Type: GrantFiled: August 31, 2017Date of Patent: July 31, 2018Assignee: Kabushiki Kaisha ToshibaInventors: Yusuke Tomoda, Koji Yano
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Patent number: 9978404Abstract: According to one embodiment, a magnetic recording head includes an air bearing surface, a magnetic pole having a distal end portion, a write shield opposed to the distal end portion of the magnetic pole across a write gap, and a high-frequency oscillator between the magnetic pole and the write shield in the write gap. The high-frequency oscillator includes a spin injection layer, an intermediate layer and an oscillation layer which are stacked in a head travel direction. A film thickness of the spin injection layer in the head travel direction at a height position away from the air bearing surface is greater than a film thickness of the spin injection layer in the head travel direction on the air bearing surface.Type: GrantFiled: July 13, 2015Date of Patent: May 22, 2018Assignee: Kabushiki Kaisha ToshibaInventors: Tomoko Taguchi, Yusuke Tomoda, Kenichiro Yamada, Satoshi Shirotori, Naoyuki Narita
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Publication number: 20160314809Abstract: According to one embodiment, a magnetic recording head includes an air bearing surface, a magnetic pole having a distal end portion, a write shield opposed to the distal end portion of the magnetic pole across a write gap, and a high-frequency oscillator between the magnetic pole and the write shield in the write gap. The high-frequency oscillator includes a spin injection layer, an intermediate layer and an oscillation layer which are stacked in a head travel direction. A film thickness of the spin injection layer in the head travel direction at a height position away from the air bearing surface is greater than a film thickness of the spin injection layer in the head travel direction on the air bearing surface.Type: ApplicationFiled: July 13, 2015Publication date: October 27, 2016Inventors: Tomoko Taguchi, Yusuke Tomoda, Kenichiro Yamada, Satoshi Shirotori, Naoyuki Narita
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Publication number: 20160225392Abstract: According to one embodiment, a recording head includes a recoding magnetic pole which applies a recording magnetic field, a write shield which faces the recording magnetic pole across a recording gap, and a spin-torque oscillator provided in the recording gap between the recording magnetic pole and the write shield. The spin-torque oscillator is physically and/or magnetically destroyed and has resistance greater than or equal to a predetermined value.Type: ApplicationFiled: March 3, 2016Publication date: August 4, 2016Inventors: Akihiko Takeo, Tomomi Funayama, Yusuke Tomoda
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Publication number: 20160163340Abstract: According to one embodiment, a microwave-assisted magnetic head includes a main magnetic pole configured to apply a recording magnetic field to a magnetic recording medium, an auxiliary magnetic pole configured to constitute a magnetic circuit together with the main magnetic pole, and a domain propagation element including a domain propagation path having two ends and a magnetic anisotropy perpendicular to a domain propagation direction, and a domain input portion configured to write a magnetic domain in the domain propagation path, and a current supply mechanism connected to the domain propagation path, and at least part of the domain propagation path passes between the main magnetic pole and the auxiliary magnetic pole.Type: ApplicationFiled: March 4, 2015Publication date: June 9, 2016Inventors: Naoyuki Narita, Kenichiro Yamada, Yusuke Tomoda, Akihiko Takeo
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Patent number: 9208800Abstract: According to one embodiment, a recording head includes a main pole, a trailing shield including a first connecting portion and a second connecting portion, and configured to form together with the main pole a first magnetic core, a leading shield including a first connecting portion connected to the main pole through a magnetic material and an end portion opposing to the end portion of the main pole through a non-magnetic material, and configured to form together with the main pole a second magnetic core, and first and second coils wound around the first and second magnetic cores, and a connection terminal configured to flow a current through the main pole, non-magnetic conductive layer, and trailing shield.Type: GrantFiled: July 25, 2014Date of Patent: December 8, 2015Assignee: Kabushiki Kaisha ToshibaInventors: Tomoko Taguchi, Yusuke Tomoda
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Publication number: 20140334030Abstract: According to one embodiment, a recording head includes a main pole, a trailing shield including a first connecting portion and a second connecting portion, and configured to form together with the main pole a first magnetic core, a leading shield including a first connecting portion connected to the main pole through a magnetic material and an end portion opposing to the end portion of the main pole through a non-magnetic material, and configured to form together with the main pole a second magnetic core, and first and second coils wound around the first and second magnetic cores, and a connection terminal configured to flow a current through the main pole, non-magnetic conductive layer, and trailing shield.Type: ApplicationFiled: July 25, 2014Publication date: November 13, 2014Inventors: Tomoko TAGUCHI, Yusuke TOMODA
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Patent number: 8810961Abstract: According to one embodiment, a recording head includes a main pole, a trailing shield including a first connecting portion and a second connecting portion, and configured to form together with the main pole a first magnetic core, a leading shield including a first connecting portion connected to the main pole through a magnetic material and an end portion opposing to the end portion of the main pole through a non-magnetic material, and configured to form together with the main pole a second magnetic core, and first and second coils wound around the first and second magnetic cores, and a connection terminal configured to flow a current through the main pole, non-magnetic conductive layer, and trailing shield.Type: GrantFiled: July 13, 2012Date of Patent: August 19, 2014Assignee: Kabushiki Kaisha ToshibaInventors: Tomoko Taguchi, Yusuke Tomoda
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Patent number: 8730616Abstract: According to one embodiment, a magnetic recording head includes a main pole, a trailing shield opposing the main pole with a write gap therebetween, and a high-frequency oscillator between a distal end portion of the main pole and the trailing shield configured to produce a high-frequency magnetic field. The high-frequency oscillator includes a lower end surface facing the recording medium and an upper end surface substantially parallel to the lower end surface. The width of the lower end surface in a track-width direction is smaller than that of the upper end surface.Type: GrantFiled: August 14, 2012Date of Patent: May 20, 2014Assignee: Kabushiki Kaisha ToshibaInventors: Kenichiro Yamada, Yusuke Tomoda, Tomoko Taguchi, Katsuhiko Koui
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Publication number: 20140002925Abstract: According to one embodiment, a magnetic recording head includes a main pole configured to apply a recording magnetic field to a recording layer of a recording medium, and a high-frequency oscillator disposed adjacent to the main pole and near a air-bearing surface which faces the recording medium. The high-frequency oscillator includes a lower end surface located nearest to the air-bearing surface and an upper end surface located farthest from the air-bearing surface. A length of the lower end surface in a cross track direction is longer than a length of the upper end surface in the cross track direction.Type: ApplicationFiled: December 12, 2012Publication date: January 2, 2014Applicant: KABUSHIKI KAISHA TOSHIBAInventors: Yusuke TOMODA, Kenichiro YAMADA, Naoyuki NARITA
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Patent number: 8614861Abstract: According to one embodiment, a magnetic recording head includes a main pole configured to apply a recording magnetic field to a recording layer of a recording medium, and a high-frequency oscillator disposed adjacent to the main pole and near a air-bearing surface which faces the recording medium. The high-frequency oscillator includes a lower end surface located nearest to the air-bearing surface and an upper end surface located farthest from the air-bearing surface. A length of the lower end surface in a cross track direction is longer than a length of the upper end surface in the cross track direction.Type: GrantFiled: December 12, 2012Date of Patent: December 24, 2013Assignee: Kabushiki Kaisha ToshibaInventors: Yusuke Tomoda, Kenichiro Yamada, Naoyuki Narita
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Patent number: 8605391Abstract: According to one embodiment, a magnetic head has a main magnetic pole, a write-shield constituting the main magnetic pole and a magnetic circuit, and a spin torque oscillation element provided between the main magnetic pole and the write-shield. The spin torque oscillation element is provided with a first oscillation layer, a nonmagnetic spin sink layer, a second oscillation layer, a nonmagnetic intermediate layer, and a spin injection layer provided in sequence from the write-shield side to the main magnetic pole side. The nonmagnetic spin sink layer is formed of at least one element selected from the group consisting of Ru, Rh, Ta, W, Cr, Ir, Mo, Re, Nb, Pt, and Pd.Type: GrantFiled: June 22, 2012Date of Patent: December 10, 2013Assignee: Kabushiki Kaisha ToshibaInventors: Katsuhiko Koui, Shuichi Murakami, Mariko Kitazaki, Yusuke Tomoda, Norihito Fujita
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Patent number: 8564904Abstract: According to one embodiment, a magnetic head includes a reproducing section. The reproducing section detects a medium magnetic field recorded in a magnetic recording medium. The reproducing section includes a stacked film and a magnetic field application unit. The stacked film includes a first magnetization layer and a second magnetization layer. The first magnetization layer has a perpendicular magnetic anisotropy. A magnetization of the first magnetization layer being is fixed. The second magnetization layer is stacked with the first magnetization layer and oscillates. The magnetic field application unit is stacked with the stacked film and applies a bias magnetic field having a component along the first axis to the stacked film. A resistance of the stacked film changes in accordance with the medium magnetic field when a current not less than a value at which the second magnetization layer oscillates is passed.Type: GrantFiled: September 22, 2011Date of Patent: October 22, 2013Assignee: Kabushiki Kaisha ToshibaInventors: Hitoshi Iwasaki, Masayuki Takagishi, Kenichiro Yamada, Susumu Hashimoto, Yusuke Tomoda
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Publication number: 20130250456Abstract: According to one embodiment, a magnetic recording head includes a main pole, a trailing shield opposing the main pole with a write gap therebetween, and a high-frequency oscillator between a distal end portion of the main pole and the trailing shield configured to produce a high-frequency magnetic field. The high-frequency oscillator includes a lower end surface facing the recording medium and an upper end surface substantially parallel to the lower end surface. The width of the lower end surface in a track-width direction is smaller than that of the upper end surface.Type: ApplicationFiled: August 14, 2012Publication date: September 26, 2013Applicant: KABUSHIKI KAISHA TOSHIBAInventors: Kenichiro YAMADA, Yusuke TOMODA, Tomoko TAGUCHI, Katsuhiko KOUI
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Publication number: 20130062308Abstract: According to one embodiment, a method of manufacturing a magnetic recording head includes forming a main pole, forming an oscillator forming layer includes an underlayer, a spin injection layer, an interlayer, an oscillator layer, and a cap layer on a trailing end surface and sidewalls of the main pole, and removing those parts of the oscillator forming layer which are formed on the sidewalls of the main pole, thereby forming a high-frequency oscillator which is aligned with a width of at least the trailing end surface of the main pole.Type: ApplicationFiled: July 3, 2012Publication date: March 14, 2013Applicant: KABUSHIKI KAISHA TOSHIBAInventors: Tomomi FUNAYAMA, Masahiro TAKASHITA, Yusuke TOMODA
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Publication number: 20130063840Abstract: According to one embodiment, a magnetic head has a main magnetic pole, a write-shield constituting the main magnetic pole and a magnetic circuit, and a spin torque oscillation element provided between the main magnetic pole and the write-shield. The spin torque oscillation element is provided with a first oscillation layer, a nonmagnetic spin sink layer, a second oscillation layer, a nonmagnetic intermediate layer, and a spin injection layer provided in sequence from the write-shield side to the main magnetic pole side. The nonmagnetic spin sink layer is formed of at least one element selected from the group consisting of Ru, Rh, Ta, W, Cr, Ir, Mo, Re, Nb, Pt, and Pd.Type: ApplicationFiled: June 22, 2012Publication date: March 14, 2013Applicant: KABUSHIKI KAISHA TOSHIBAInventors: Katsuhiko Koui, Shuichi Murakami, Mariko Kitazaki, Yusuke Tomoda, Norihito Fujita
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Publication number: 20130016441Abstract: According to one embodiment, a recording head includes a main pole, a trailing shield including a first connecting portion and a second connecting portion, and configured to form together with the main pole a first magnetic core, a leading shield including a first connecting portion connected to the main pole through a magnetic material and an end portion opposing to the end portion of the main pole through a non-magnetic material, and configured to form together with the main pole a second magnetic core, and first and second coils wound around the first and second magnetic cores, and a connection terminal configured to flow a current through the main pole, non-magnetic conductive layer, and trailing shield.Type: ApplicationFiled: July 13, 2012Publication date: January 17, 2013Applicant: Kabushiki Kaisha ToshibaInventors: Tomoko Taguchi, Yusuke Tomoda
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Publication number: 20120243127Abstract: According to one embodiment, a magnetic head includes a reproducing section. The reproducing section detects a medium magnetic field recorded in a magnetic recording medium. The reproducing section includes a stacked film and a magnetic field application unit. The stacked film includes a first magnetization layer and a second magnetization layer. The first magnetization layer has a perpendicular magnetic anisotropy. A magnetization of the first magnetization layer being is fixed. The second magnetization layer is stacked with the first magnetization layer and oscillates. The magnetic field application unit is stacked with the stacked film and applies a bias magnetic field having a component along the first axis to the stacked film. A resistance of the stacked film changes in accordance with the medium magnetic field when a current not less than a value at which the second magnetization layer oscillates is passed.Type: ApplicationFiled: September 22, 2011Publication date: September 27, 2012Applicant: Kabushiki Kaisha ToshibaInventors: Hitoshi IWASAKI, Masayuki Takagishi, Kenichiro Yamada, Susumu Hashimoto, Yusuke Tomoda