Patents by Inventor Nobuo Yoshida
Nobuo Yoshida 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: 20150221329Abstract: The embodiments disclosed generally relate to a magnetic recording head having three magnetoresistive effect elements. The structure comprises a first magnetoresistive effect element on a lower magnetic shield layer. Additionally, two lower electrodes are disposed on the two sides of the first magnetoresistive effect element. A second magnetoresistive effect element is disposed on a lower electrode while a third magnetoresistive effect element on another lower electrode. An upper magnetic shield layer is disposed between the second magnetoresistive effect element and the third magnetoresistive effect element. The upper magnetic shield also serves as an electrode of the first magnetoresistive effect element.Type: ApplicationFiled: February 5, 2014Publication date: August 6, 2015Applicant: HGST NETHERLANDS B.V.Inventors: Hideki MASHIMA, Nobuo YOSHIDA, Iwata NORIHIRO, Tsutomu YASUDA
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Patent number: 9099125Abstract: A two-dimensional magnetic recording (TDMR) multi-sensor read head has three stacked sensors separated by magnetic shields. The lower sensor is the primary sensor that is always aligned with the target track. The middle sensor is spaced laterally from the lower sensor a distance substantially equal to the track pitch (TP). The upper sensor is aligned with the lower sensor. The spacing D between the lower and upper sensors is selected to be related to TP and a maximum skew angle, where the skew angle is the angle between a line orthogonal to the sensor and the data track that varies with radial position of the head. The read head is connected to circuitry that selects two of the three sensors to be the active sensors depending on the radial position of the head and thus the skew angle of the head.Type: GrantFiled: October 14, 2014Date of Patent: August 4, 2015Assignee: HGST Netherlands B.V.Inventors: Masashi Hattori, Kenichi Meguro, Kouichi Nishioka, Takashi Wagatsuma, Nobuo Yoshida
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Patent number: 9082436Abstract: The embodiments disclosed generally relate to a magnetic recording head having three magnetoresistive effect elements. The structure comprises a first magnetoresistive effect element on a lower magnetic shield layer. Additionally, two lower electrodes are disposed on the two sides of the first magnetoresistive effect element. A second magnetoresistive effect element is disposed on a lower electrode while a third magnetoresistive effect element on another lower electrode. An upper magnetic shield layer is disposed between the second magnetoresistive effect element and the third magnetoresistive effect element. The upper magnetic shield also serves as an electrode of the first magnetoresistive effect element.Type: GrantFiled: February 5, 2014Date of Patent: July 14, 2015Assignee: HGST NETHERLANDS B.V.Inventors: Hideki Mashima, Nobuo Yoshida, Iwata Norihiro, Tsutomu Yasuda
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Patent number: 9080180Abstract: A technology for producing a pig edema disease vaccine at low cost and at high efficiency is developed. Specifically, a gene of a pig edema disease toxin protein (Stx2e protein) is efficiently expressed in plant cells to produce a plant vaccine for pig edema disease at low cost. An Stx2e protein including a secretory signal peptide derived from a plant added at an amino terminus is expressed in cells of a plant such as Lactuca sativa using the 5?-untranslated region of an alcohol dehydrogenase gene (ADH5?UTR) derived from a plant.Type: GrantFiled: March 25, 2008Date of Patent: July 14, 2015Assignees: IDEMITSU KOSAN CO., LTD., NATIONAL UNIVERSITY CORPORATION NARA INSTITUTE OF SCIENCE AND TECHNOLOGY, NATIONAL UNIVERSITY CORPORATION OBIHIRO UNIVERSITY OF AGRICULTURE AND VETERINARY MEDICINEInventors: Kazutoshi Sawada, Takeshi Matsui, Sou-ichi Makino, Keiko Kawamoto, Mayumi Yoshida, Nobuo Yoshida, Kyoko Yoshida
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Patent number: 9042060Abstract: In one embodiment, a magnetic head includes a lower shield, a magnetoresistive (MR) film positioned above the lower shield, the MR film including a pinned layer, an intermediate layer positioned above the pinned layer, and a free layer positioned above the intermediate layer, the free layer being configured for sensing data on a magnetic medium, wherein a track width of the MR film is defined by a width of the free layer in a cross-track direction, a bias layer positioned on both sides of the MR film in the cross-track direction, a track insulating film positioned on both sides of the MR film in the cross-track direction and between the MR film and the bias layer, and an upper shield positioned above the bias layer and the MR film, wherein a length of the free layer in an element height direction perpendicular to an air bearing surface of the magnetic head is less than a length of the pinned layer in the element height direction.Type: GrantFiled: September 25, 2013Date of Patent: May 26, 2015Assignee: HGST Netherlands B.V.Inventors: Nobuo Yoshida, Hideki Mashima, Norihiro Iwata, Takahiro Ibusuki
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Publication number: 20150138668Abstract: In one embodiment, a magnetic head includes at least one magnetoresistive (MR) element positioned at a media-facing surface of the magnetic head, a lower portion of the at least one MR element extending in an element height direction away from the media-facing surface of the magnetic head farther than an upper portion of the at least one MR element, at least one back wiring layer positioned behind the upper portion of the at least one MR element in the element height direction and above the lower portion of the at least one MR element, the at least one back wiring layer being configured to electrically communicate with the at least one MR element, and an upper wiring layer positioned above the at least one MR element at the media-facing surface of the magnetic head and extending in the element height direction away from the media-facing surface of the magnetic head.Type: ApplicationFiled: January 13, 2015Publication date: May 21, 2015Applicant: HGST Netherlands B.V.Inventors: Hideki Mashima, Nobuo Yoshida, Masashi Hattori, Tutomu Yasuda
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Publication number: 20150085395Abstract: In one embodiment, a magnetic head includes a lower shield, a magnetoresistive (MR) film positioned above the lower shield, the MR film including a pinned layer, an intermediate layer positioned above the pinned layer, and a free layer positioned above the intermediate layer, the free layer being configured for sensing data on a magnetic medium, wherein a track width of the MR film is defined by a width of the free layer in a cross-track direction, a bias layer positioned on both sides of the MR film in the cross-track direction, a track insulating film positioned on both sides of the MR film in the cross-track direction and between the MR film and the bias layer, and an upper shield positioned above the bias layer and the MR film, wherein a length of the free layer in an element height direction perpendicular to an air bearing surface of the magnetic head is less than a length of the pinned layer in the element height direction.Type: ApplicationFiled: September 25, 2013Publication date: March 26, 2015Applicant: HGST Netherlands B.V.Inventors: Nobuo Yoshida, Hideki Mashima, Norihiro Iwata, Takahiro Ibusuki
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Patent number: 8953284Abstract: In one embodiment, a magnetic head includes a lower shield layer positioned at a media-facing surface of the magnetic head, at least two magnetoresistive (MR) elements positioned above the lower shield layer, each MR element extending in an element height direction away from the media-facing surface of the magnetic head, back wiring layers positioned above at least one lower layer of each of the MR elements at a position away from the media-facing surface of the magnetic head in the element height direction, wherein the back wiring layers are configured to electrically communicate with the MR elements and configured to separately extract signals from each MR element during a read operation, and an upper shield layer positioned above the MR elements that is configured to electrically communicate with the MR elements.Type: GrantFiled: November 20, 2013Date of Patent: February 10, 2015Assignee: HGST Netherlands B.V.Inventors: Hideki Mashima, Nobuo Yoshida, Masashi Hattori, Tutomu Yasuda
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Patent number: 8846052Abstract: A bacterial toxin protein such as a Shiga toxin protein is efficiently produced using plant cells. The plant cells are transformed using a DNA construct containing DNA encoding a hybrid protein in which the bacterial toxin proteins such as the Shiga toxin proteins are tandemly linked through a peptide having the following characteristics (A) and (B) to produce the bacterial toxin protein in the plant cells: (A) a number of amino acids is 12 to 30; and (B) a content of proline is 20 to 35%.Type: GrantFiled: April 28, 2009Date of Patent: September 30, 2014Assignees: Idemitsu Kosan Co., Ltd., National University Corporation Nara Institute of Science and TechnologyInventors: Kazutoshi Sawada, Takeshi Matsui, Mayumi Yoshida, Nobuo Yoshida, Kyoko Yoshida
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Patent number: 8824103Abstract: The strength of a magnetic field applied from a main pole to an oscillator and the strength of a magnetic field applied from the main pole to a recording medium are improved in a magnetic recording head for microwave assisted recording. In the magnetic recording head according to the present invention, an interval between the main pole and a trailing shield at a place in a position above an air bearing surface is larger than an interval between the main pole and the trailing shield on the air bearing surface.Type: GrantFiled: February 24, 2012Date of Patent: September 2, 2014Assignee: Hitachi, Ltd.Inventors: Masato Shiimoto, Kenji Sugiura, Mikito Sugiyama, Isao Nunokawa, Yo Sato, Katsuro Watanabe, Kazuhiko Hosomi, Nobuo Yoshida
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Patent number: 8786988Abstract: A magnetic sensor having reduced read gap thickness, reduced signal noise and improved signal to noise ratio. The sensor includes a sensor stack and hard bias structures formed at either side of the sensor stack for biasing the free layer of the sensor. A protective layer is formed over a portion of the hard bias structure, however a portion of the hard bias structure extends upward toward the upper shield and is disposed between the protective layer and the sensor stack as a result of the process used to form the magnetic bias structure. This portion of the hard bias structure that extends toward the upper shield has a reduced magnetization relative to the rest of the hard bias structure so that it will not magnetically couple with the upper shield.Type: GrantFiled: May 15, 2012Date of Patent: July 22, 2014Assignee: HGST Netherlands B.V.Inventors: Hideki Mashima, Nobuo Yoshida, Takahiro Ibusuki, Tsutomu Yasuda
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Publication number: 20140133052Abstract: A magnetic read head having a reduced read gap and a stable magnetic pinned layer structure. The sensor includes a seed layer that has a surface formed with an anisotropic texture. A magnetic pinned layer formed over the seed layer has a body centered cubic structure which causes the pinned layer structure to have a magnetic anisotropy with an easy axis oriented perpendicular to the air bearing surface when deposited over the textured seed layer. A magnetic free layer structure formed over the pinned layer structure and over a non-magnetic barrier layer has a face centered cubic structure which causes the magnetic free layer to have a magnetic anisotropy with an easy axis oriented parallel with the air bearing surface.Type: ApplicationFiled: November 14, 2012Publication date: May 15, 2014Applicant: HGST NETHERLANDS B.V.Inventors: Kenichi Meguro, Keizo Kato, Susumu Okamura, Nobuo Yoshida
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Publication number: 20130308228Abstract: A magnetic sensor having reduced read gap thickness, reduced signal noise and improved signal to noise ratio. The sensor includes a sensor stack and hard bias structures formed at either side of the sensor stack for biasing the free layer of the sensor. A protective layer is formed over a portion of the hard bias structure, however a portion of the hard bias structure extends upward toward the upper shield and is disposed between the protective layer and the sensor stack as a result of the process used to form the magnetic bias structure. This portion of the hard bias structure that extends toward the upper shield has a reduced magnetization relative to the rest of the hard bias structure so that it will not magnetically couple with the upper shield.Type: ApplicationFiled: May 15, 2012Publication date: November 21, 2013Applicant: Hitachi Global Storage Technologies Netherlands B.V.Inventors: Hideki Mashima, Nobuo Yoshida, Takahiro Ibusuki, Tsutomu Yasuda
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Patent number: 8537505Abstract: According to one embodiment, a magnetoresistive effect head includes a lower magnetic shield provided on a substrate, a magnetoresistive effect film laminated from a pinned layer with a pinned direction of magnetization, an intermediate layer, a free layer having a varying direction of magnetization controlled by an applied external magnetic field, a magnetic domain control layer formed with an intervening insulation layer on both sides in a track width direction of the magnetoresistive effect film, an upper magnetic shield, and electrodes for directing sense current flow in a direction perpendicular to a film surface of the magnetoresistive effect film, wherein a magnetic field applied by the magnetic domain control layer to a region away from an ABS of the free layer is at least 1.4 times larger than a magnetic field applied by the magnetic domain control layer to a region near the ABS of the free layer.Type: GrantFiled: May 20, 2010Date of Patent: September 17, 2013Assignee: HGST Netherlands B.V.Inventors: Masato Shiimoto, Kan Yasui, Nobuo Yoshida, Hiroyuki Takazawa
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Patent number: 8520338Abstract: Minute elements are formed while a photo deviation is suppressed between a spin torque oscillator and a main pole and damage is prevented on the ends of the spin torque oscillator in microwave-assisted recording. A magnetic recording head used for microwave-assisted recording includes: a main pole; a spin torque oscillator that is disposed on the main pole and includes a magnetization high-speed rotation layer for rotating magnetization at a high speed by a spin torque; a protective film that is disposed in the track width direction of the spin torque oscillator; an insulating film formed over the wall surfaces of the main pole and the wall surfaces of the protective film; and a magnetic film formed on the insulating film so as to cover at least the main pole.Type: GrantFiled: December 6, 2011Date of Patent: August 27, 2013Assignee: Hitachi, Ltd.Inventors: Yuta Udo, Mikito Sugiyama, Masato Shiimoto, Nobuo Yoshida, Kenji Sugiura, Masashi Hattori
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Patent number: 8432646Abstract: Embodiments of the present invention help to reduce etching damage at end parts of a magnetoresistive sensor in ion beam etching. According to one embodiment, ion beam etching (IBE) is used in a magnetoresistive sensor track width forming step. This IBE irradiates Ar ion beam to a substrate in a state that the substrate is inclined and further rotates the substrate about its normal as a rotational axis. In a conventional track width forming step, the IBE irradiates the Ar ion beam to the substrate all the time while the IBE is rotating the substrate. By contrast, the IBE according to embodiments of the present invention irradiates the Ar ion beam to the substrate only in a predetermined specific angular range.Type: GrantFiled: February 4, 2008Date of Patent: April 30, 2013Assignee: HGST Netherlands B.V.Inventors: Shuuichi Kojima, Satoru Okamoto, Nobuo Yoshida, Katsuro Watanabe
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Publication number: 20130057980Abstract: The strength of a magnetic field applied from a main pole to an oscillator and the strength of a magnetic field applied from the main pole to a recording medium are improved in a magnetic recording head for microwave assisted recording. In the magnetic recording head according to the present invention, an interval between the main pole and a trailing shield at a place in a position above an air bearing surface is larger than an interval between the main pole and the trailing shield on the air bearing surface.Type: ApplicationFiled: February 24, 2012Publication date: March 7, 2013Inventors: Masato SHIIMOTO, Kenji SUGIURA, Mikito SUGIYAMA, Isao NUNOKAWA, Yo SATO, Katsuro WATANABE, Kazuhiko HOSOMI, Nobuo YOSHIDA
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Patent number: 8373943Abstract: According to one embodiment, a method for producing a magnetic head includes depositing a first film above a substrate, etching a pattern into the first film, depositing a second film on the etched portion of the first film, and depositing a third film above the first and second film to form a multilayer magnetic film, wherein the second film is embedded between the first and third film in a portion of the first film that is removed. In another embodiment, a differential magnetic read head includes a magnetic multilayer film comprising a stack of a first magnetic sensor film and a second magnetic sensor film which are not magnetically connected and a hard magnetic film provided on both sides in a track width direction of the magnetic multilayer film for controlling a magnetic domain of the magnetic multilayer film. The hard magnetic film is a laminated structure as described above.Type: GrantFiled: November 8, 2010Date of Patent: February 12, 2013Assignee: Hitachi Global Storage Technologies Netherlands B.V.Inventors: Kan Yasui, Nobuo Yoshida, Katsuro Watanabe, Norihiro Okawa
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Patent number: 8355224Abstract: Embodiments of the present invention help to prevent a head characteristic from being deteriorated by re-deposition or damage which occurs when a sensor film is etched, a track width is narrowed, and the head characteristic is stabilized. According to one embodiment, when it is assumed that the thickness of the sensor film on an air bearing surface is T, and a distance between an end of a medium layer that is interposed between a free layer and a pinned layer which comprise the sensor film and an end of the sensor film lowest portion, a relationship of 1.2×T?X?2.5×T is satisfied, and the ends of a pair of magnetic films which are in contact with both sides in the track-width direction through an insulator do not exist in the track central portion from the free layer end.Type: GrantFiled: January 29, 2008Date of Patent: January 15, 2013Assignee: Hitachi Global Storage Technologies Netherlands B.V.Inventors: Satoru Okamoto, Koji Okazaki, Shuuichi Kojima, Nobuo Yoshida, Katsuro Watanabe, Hiroyuki Katada
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Patent number: 8284527Abstract: A magnetic head, according to one embodiment, includes a sensor film, a sensor cap film provided above the sensor film, a pair of shields including an upper magnetic shield and a lower magnetic shield which serve as electrodes that pass current in a film thickness direction of the sensor film, a track insulating film contacting both sides of the sensor film in the track width direction, a graded domain control film arranged on both sides in the track width direction of the sensor film adjacent the track insulating film, and an element height direction insulating film positioned on an opposite side of the sensor film relative to an air-bearing surface, wherein an edge position of the element height direction insulating film adjacent the sensor film on the air-bearing surface side is substantially the same as an edge position of the sensor cap film in the element height direction.Type: GrantFiled: November 30, 2010Date of Patent: October 9, 2012Assignee: Hitachi Global Storage Technologies Netherlands B.V.Inventors: Nobuo Yoshida, Masato Shiimoto, Kenichi Akita, Kan Yasui