Patents by Inventor Keita Kawamori
Keita Kawamori 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: 20240094313Abstract: A magnetic sensor includes an insulating layer, a first MR element, and a second MR element. The insulating layer includes a first layer and a second layer, and also includes first and second inclined surfaces formed across the first layer and the second layer. Each of the first and second MR elements includes a magnetization pinned layer and a free layer. The magnetization pinned layer and the free layer of the first MR element are disposed on the first inclined surface. The magnetization pinned layer and the free layer of the second MR element are disposed on the second inclined surface.Type: ApplicationFiled: November 30, 2023Publication date: March 21, 2024Applicant: TDK CorporationInventors: Hiromichi UMEHARA, Keita KAWAMORI, Kenzo MAKINO, Masachika HASHINO
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Patent number: 11867779Abstract: A magnetic sensor includes an insulating layer, a first MR element, and a second MR element. The insulating layer includes a first layer and a second layer, and also includes first and second inclined surfaces formed across the first layer and the second layer. Each of the first and second MR elements includes a magnetization pinned layer and a free layer. The magnetization pinned layer and the free layer of the first MR element are disposed on the first inclined surface. The magnetization pinned layer and the free layer of the second MR element are disposed on the second inclined surface.Type: GrantFiled: September 15, 2022Date of Patent: January 9, 2024Assignee: TDK CORPORATIONInventors: Hiromichi Umehara, Keita Kawamori, Kenzo Makino, Masachika Hashino
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Publication number: 20230095583Abstract: A magnetic sensor includes a plurality of resistor sections each including a plurality of MR elements, and a plurality of protruding surfaces each structured to cause the plurality of MR elements to detect a specific component of a target magnetic field. The plurality of MR elements are disposed dividedly in first to fourth areas corresponding to the respective resistor sections. Each of the first to fourth areas includes a first and a second end edge located at both ends in a first reference direction, and a third and a fourth end edge located at both ends in a second reference direction. An angle that each of the plurality of protruding surfaces forms with respect to the first end edge or the second end edge is larger than an angle that each of the plurality of protruding surfaces forms with respect to the third end edge or the fourth end edge.Type: ApplicationFiled: September 20, 2022Publication date: March 30, 2023Applicant: TDK CORPORATIONInventors: Keita KAWAMORI, Hiromichi UMEHARA
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Publication number: 20230091757Abstract: A magnetic sensor includes an insulating layer, a coil element disposed on the insulating layer, and a first insulating film. The insulating layer includes a first inclined surface and a second inclined surface. The coil element includes a first side surface and a second side surface. The first side surface includes a first portion and a second portion, the second portion being disposed at a position farther from a top surface of a substrate than a position where the first portion is disposed. The first portion is inclined so as to intersect with the first and second inclined surfaces, and is also inclined so as to be closer to the second side surface at positions closer to the top surface of the substrate. The first insulating film covers the first portion.Type: ApplicationFiled: September 19, 2022Publication date: March 23, 2023Applicant: TDK CORPORATIONInventors: Keita KAWAMORI, Hiraku HIRABAYASHI, Hiromichi UMEHARA
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Publication number: 20230086730Abstract: A magnetic sensor includes an insulating layer, a first MR element, and a second MR element. The insulating layer includes a protruding surface including first and second inclined surfaces. Each of the first and second MR elements includes a magnetization pinned layer and a free layer. The magnetization pinned layer and the free layer of the first MR element are disposed on the first inclined surface. The magnetization pinned layer and the free layer of the second MR element are disposed on the second inclined surface. The dimension of the protruding surface in a direction parallel to the Z direction is in the range of 1.4 µm to 3.0 µm.Type: ApplicationFiled: September 15, 2022Publication date: March 23, 2023Applicant: TDK CORPORATIONInventors: Hiromichi UMEHARA, Keita KAWAMORI, Kenzo MAKINO, Masachika HASHINO
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Publication number: 20230086267Abstract: A magnetic sensor includes an insulating layer, a first MR element, and a second MR element. The insulating layer includes a first layer and a second layer, and also includes first and second inclined surfaces formed across the first layer and the second layer. Each of the first and second MR elements includes a magnetization pinned layer and a free layer. The magnetization pinned layer and the free layer of the first MR element are disposed on the first inclined surface. The magnetization pinned layer and the free layer of the second MR element are disposed on the second inclined surface.Type: ApplicationFiled: September 15, 2022Publication date: March 23, 2023Applicant: TDK CORPORATIONInventors: Hiromichi UMEHARA, Keita KAWAMORI, Kenzo MAKINO, Masachika HASHINO
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Patent number: 11573122Abstract: A resistive element array circuit includes word lines, bit lines, resistive elements, a selector, a differential amplifier, and a ground terminal. The word lines are coupled to a power supply. The resistive elements are each disposed at an intersection of corresponding one of the word lines and corresponding one of the bit lines. The selector is configured to select one word line and one bit line. The differential amplifier includes a positive input terminal configured to be coupled to the selected one of the bit lines which is selected by the selector, a negative input terminal configured to be coupled to non-selected one of the bit lines which is not selected by the selector and to non-selected one of the word lines which is not selected by the selector, an output terminal being coupled to the negative input terminal. The ground terminal is coupled to the positive input terminal.Type: GrantFiled: August 26, 2019Date of Patent: February 7, 2023Assignee: TDK CORPORATIONInventors: Naoki Ohta, Yuji Kakinuma, Shinji Hara, Susumu Aoki, Keita Kawamori, Eiji Komura
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Publication number: 20200072664Abstract: A resistive element array circuit includes word lines, bit lines, resistive elements, a selector, a differential amplifier, and a ground terminal. The word lines are coupled to a power supply. The resistive elements are each disposed at an intersection of corresponding one of the word lines and corresponding one of the bit lines. The selector is configured to select one word line and one bit line. The differential amplifier includes a positive input terminal configured to be coupled to the selected one of the bit lines which is selected by the selector, a negative input terminal configured to be coupled to non-selected one of the bit lines which is not selected by the selector and to non-selected one of the word lines which is not selected by the selector, an output terminal being coupled to the negative input terminal. The ground terminal is coupled to the positive input terminal.Type: ApplicationFiled: August 26, 2019Publication date: March 5, 2020Applicant: TDK CORPORATIONInventors: Naoki OHTA, Yuji KAKINUMA, Shinji HARA, Susumu AOKI, Keita KAWAMORI, Eiji KOMURA
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Patent number: 9025422Abstract: The present invention relates to a plasmon generator, in which a surface plasmon is excited by application of light. The plasmon generator extends along one direction. The plasmon generator includes a first end surface that is positioned on one end in the one direction and at which near-field light is generated along with the excitation of the plasmon; and a second cross section that is substantially parallel to the first end surface and is away from the first end surface. The first end surface has a polygonal shape that does not have a substantially acute inner angle. The second cross section has an upper part that has a shape substantially the same as or similar to that of the first end surface and a flare shaped lower part that is connected to the upper part and has a width that increases as it is far from the upper part.Type: GrantFiled: March 25, 2013Date of Patent: May 5, 2015Assignee: TDK CorporationInventors: Susumu Aoki, Kosuke Tanaka, Keita Kawamori, Hiroki Kawato, Takeshi Tsutsumi
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Patent number: 8964514Abstract: A plasmon-generator of the invention is configured to include a first configuration member including a near-field light generating end surface; and a second configuration member joined and integrated with the first configuration member and not including the near-field light generating end surface. The first configuration member is configured to contain Au as a primary component and to contain any one or more elements selected from a group of Co, Fe, Sb, Nb, Zr, Ti, Hf, and Ta, and is configured so that a content percentage X1 of the contained element is within a range between 0.2 at % or more and 2.0 at % or less. Thereby, thermostability, optical characteristic, and the process stability are satisfied. Also, heat dissipation and heat generation suppression effect are extremely superior.Type: GrantFiled: August 7, 2012Date of Patent: February 24, 2015Assignee: TDK CorporationInventors: Kei Hirata, Ryo Hosoi, Keita Kawamori, Tetsuya Roppongi
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Patent number: 8873185Abstract: The thermally-assisted magnetic recording head includes: a magnetic pole having an end exposed on an air-bearing surface; a waveguide; a plasmon generator formed essentially of a first metallic material, and having a first region and a second region, the first region extending backward from the air-bearing surface to a first position, and the second region being coupled with the first region at the first position and extending backward from the first position; and a metallic layer filling a part in the second region, and formed essentially of a second metallic material that has a higher melting temperature than a melting temperature of the first metallic material.Type: GrantFiled: March 25, 2013Date of Patent: October 28, 2014Assignee: TDK CorporationInventors: Kosuke Tanaka, Susumu Aoki, Keita Kawamori, Hiroki Kawato
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Publication number: 20140285919Abstract: The thermally-assisted magnetic recording head includes: a magnetic pole having an end exposed on an air-bearing surface; a waveguide; a plasmon generator formed essentially of a first metallic material, and having a first region and a second region, the first region extending backward from the air-bearing surface to a first position, and the second region being coupled with the first region at the first position and extending backward from the first position; and a metallic layer filling a part in the second region, and formed essentially of a second metallic material that has a higher melting temperature than a melting temperature of the first metallic material.Type: ApplicationFiled: March 25, 2013Publication date: September 25, 2014Applicant: TDK CORPORATIONInventors: Kosuke TANAKA, Susumu AOKI, Keita KAWAMORI, Hiroki KAWATO
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Publication number: 20140286147Abstract: The present invention relates to a plasmon generator, in which a surface plasmon is excited by application of light. The plasmon generator extends along one direction. The plasmon generator includes a first end surface that is positioned on one end in the one direction and at which near-field light is generated along with the excitation of the plasmon; and a second cross section that is substantially parallel to the first end surface and is away from the first end surface. The first end surface has a polygonal shape that does not have a substantially acute inner angle. The second cross section has an upper part that has a shape substantially the same as or similar to that of the first end surface and a flare shaped lower part that is connected to the upper part and has a width that increases as it is far from the upper part.Type: ApplicationFiled: March 25, 2013Publication date: September 25, 2014Inventors: Susumu AOKI, Kosuke TANAKA, Keita KAWAMORI, Hiroki KAWATO, Takeshi TSUTSUMI
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Patent number: 8767348Abstract: The thermally-assisted magnetic recording head of the invention includes: a waveguide; a magnetic pole; a cladding layer provided between the waveguide and the magnetic pole; and a plasmon generator embedded in the cladding layer. The cladding layer includes a first cladding section located on a side close to an air-bearing surface and a second cladding section located on a side far from the air-bearing surface, and a thermal expansion coefficient of the first cladding section is larger than a thermal expansion coefficient of the second cladding section.Type: GrantFiled: March 7, 2013Date of Patent: July 1, 2014Assignee: TDK CorporationInventors: Kosuke Tanaka, Susumu Aoki, Keita Kawamori, Hiroki Kawato
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Patent number: 8675457Abstract: A near-field light generator includes a waveguide, a plasmon generator, and an MgO layer. The waveguide includes a core and a cladding. The plasmon generator has an outer surface including a plasmon exciting part and a near-field light generating part, and is configured so that a surface plasmon is excited on the plasmon exciting part based on light propagating through the core, and the near-field light generating part generates near-field light based on the surface plasmon. The MgO layer is in contact with at least part of the outer surface of the plasmon generator excluding the near-field light generating part, and not in contact with the core. The cladding is lower in refractive index than the core and the MgO layer.Type: GrantFiled: November 28, 2012Date of Patent: March 18, 2014Assignee: TDK CorporationInventors: Kei Hirata, Keita Kawamori, Nobuyuki Mori, Kosuke Tanaka
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Publication number: 20140043948Abstract: A plasmon-generator of the invention is configured to include a first configuration member including a near-field light generating end surface; and a second configuration member joined and integrated with the first configuration member and not including the near-field light generating end surface. The first configuration member is configured to contain Au as a primary component and to contain any one or more elements selected from a group of Co, Fe, Sb, Nb, Zr, Ti, Hf, and Ta, and is configured so that a content percentage X1 of the contained element is within a range between 0.2 at % or more and 2.0 at % or less. Thereby, thermostability, optical characteristic, and the process stability are satisfied. Also, heat dissipation and heat generation suppression effect are extremely superior.Type: ApplicationFiled: August 7, 2012Publication date: February 13, 2014Applicant: TDK CORPORATIONInventors: Kei HIRATA, Ryo HOSOI, Keita KAWAMORI, Tetsuya ROPPONGI
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Patent number: 8503270Abstract: A thermally-assisted magnetic recording head includes a magnetic pole, a waveguide, and a plasmon generator. The plasmon generator and the magnetic pole are disposed to align in the direction of travel of a magnetic recording medium. The thermally-assisted magnetic recording head further includes an amorphous layer made of a nonmagnetic metal, the amorphous layer being interposed between and in contact with the plasmon generator and the magnetic pole.Type: GrantFiled: April 26, 2012Date of Patent: August 6, 2013Assignee: TDK CorporationInventors: Keita Kawamori, Kei Hirata, Tetsuya Roppongi
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Patent number: 8432773Abstract: A thermally-assisted magnetic head that has an air bearing surface (ABS) facing a recording medium and that performs magnetic recording while heating the recording medium includes: a magnetic recording element that includes a pole of which an edge part is positioned on the ABS and which generates magnetic flux traveling to the recording medium; a waveguide that is configured with a core through which light propagates and a cladding, surrounding a periphery of the core, at least one part of which extends to the ABS; a plasmon generator that faces a part of the core and that extends toward the ABS side; and a bank layer that is positioned between the plasmon generator and the pole, and of which an edge part on the ABS side protrudes relative to the plasmon generator.Type: GrantFiled: December 8, 2010Date of Patent: April 30, 2013Assignee: TDK CorporationInventors: Shinji Hara, Kosuke Tanaka, Keita Kawamori, Daisuke Miyauchi, Takahiko Izawa, Eiji Komura
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Patent number: 8369048Abstract: A thin film magnetic head includes a magnetoresistive (MR) stack disposed between first and second shield layers in a direction orthogonal to the film surface; a first exchange-coupling layer that is positioned between the MR stack and the first shield layer; a second exchange-coupling layer that is positioned between the MR stack and the second shield layer; a bias magnetic field application layer that is disposed at an opposite surface of the MR stack from an air bearing surface (ABS); and pair of side shield layers that are positioned at both sides of the MR stack with respect to a track width direction. Each of the side shield layers includes a pair of magnetic layers that are antiferromagnetically exchange-coupled through a side shield ruthenium layer.Type: GrantFiled: August 31, 2009Date of Patent: February 5, 2013Assignee: TDK CorporationInventors: Daisuke Miyauchi, Keita Kawamori, Takahiko Machita
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Patent number: 8325570Abstract: A thermally-assisted magnetic recording head includes: a medium facing surface; a magnetic pole; a waveguide including a core and a cladding; a plasmon generator; and a protruding member. The protruding member is disposed between the medium facing surface and a front end face of the core facing toward the medium facing surface. The protruding member has a first end face located in the medium facing surface, and a second end face facing toward the front end face of the core and receiving light having propagated through the core and passed through the front end face. The protruding member is formed of a metal different from both a material forming the magnetic pole and a material forming the plasmon generator. The protruding member is heated and expanded by the light received at the second end face, so that the first end face gets protruded toward a magnetic recording medium.Type: GrantFiled: February 1, 2012Date of Patent: December 4, 2012Assignee: TDK CorporationInventors: Kosuke Tanaka, Tetsuya Roppongi, Kei Hirata, Susumu Aoki, Takahiko Izawa, Makoto Isogai, Keita Kawamori, Takeshi Tsutsumi