Patents by Inventor Kota Asatsuma
Kota Asatsuma 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: 9207293Abstract: A magnetic sensor having no sensitivity differences between sensitivity axes, and an easy manufacturing method therefor are provided. The method includes a process of forming first stacked films for a magnetoresistive element on a substrate. This element has a sensitivity axis in a certain direction and includes a self-pinned ferromagnetic pinned layer in which first and second ferromagnetic films are antiferromagnetically coupled through an antiparallel coupling layer, a nonmagnetic intermediate layer, and a soft magnetic free layer. The method further includes a process of removing a region of the first stacked films from the substrate. The remaining region of the films includes at least a region to be left to form the element. The method furthermore includes a process of forming second stacked films for a magnetoresistive element, which has a sensitivity axis in a direction different from the certain direction and has the same structure, on the exposed substrate.Type: GrantFiled: May 8, 2012Date of Patent: December 8, 2015Assignee: ALPS ELECTRIC CO., LTD.Inventors: Hideto Ando, Shinji Sugihara, Fumihito Koike, Kota Asatsuma
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Patent number: 8760913Abstract: A magnetic detecting element includes a laminated structure where a fixed magnetic layer and a free magnetic layer are laminated through a non-magnetic material layer, wherein the fixed magnetic layer is a self-pinned type where a first magnetic layer and a second magnetic layer are laminated through a non-magnetic intermediate layer and the first magnetic layer and the second magnetic layer are antiparallelly magnetization-fixed, and the second magnetic layer is in contact with the non-magnetic material layer. The first magnetic layer is formed using FeCo serving as a material having a higher coercive force than the second magnetic layer. The film thickness of the first magnetic layer falls within a range greater than or equal to 10 ? and less than or equal to 17 ?, and is thinner than the film thickness of the second magnetic layer. The non-magnetic intermediate layer is formed using Rh.Type: GrantFiled: December 7, 2012Date of Patent: June 24, 2014Assignee: Alps Electric Co., Ltd.Inventors: Fumihito Koike, Kota Asatsuma
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Publication number: 20130257422Abstract: A magnetic sensor of the present invention includes a magnetoresistive element having a sensitivity axis in a specified direction, the magnetoresistive element having a laminated structure including a ferromagnetic pinned layer having a pinned magnetization direction, a nonmagnetic intermediate layer, a free magnetic layer having a magnetization direction varying with an external magnetic field, and an antiferromagnetic layer which applies an exchange coupling magnetic field to the free magnetic layer.Type: ApplicationFiled: May 29, 2013Publication date: October 3, 2013Inventors: Fumihito KOIKE, Kota ASATSUMA, Masamichi SAITO, Akira TAKAHASHI, Yosuke IDE
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Publication number: 20130257581Abstract: A magnetic detecting element includes a laminated structure where a fixed magnetic layer and a free magnetic layer are laminated through a non-magnetic material layer, wherein the fixed magnetic layer is a self-pinned type where a first magnetic layer and a second magnetic layer are laminated through a non-magnetic intermediate layer and the first magnetic layer and the second magnetic layer are antiparallelly magnetization-fixed, and the second magnetic layer is in contact with the non-magnetic material layer. The first magnetic layer is formed using FeCo serving as a material having a higher coercive force than the second magnetic layer. The film thickness of the first magnetic layer falls within a range greater than or equal to 10 ? and less than or equal to 17 ?, and is thinner than the film thickness of the second magnetic layer. The non-magnetic intermediate layer is formed using Rh.Type: ApplicationFiled: December 7, 2012Publication date: October 3, 2013Applicant: ALPS ELECTRIC CO., LTD.Inventors: Fumihito KOIKE, Kota ASATSUMA
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Publication number: 20130009630Abstract: A magnetic detection device includes a layered film including a self-pinned magnetic layer, a free magnetic layer, a nonmagnetic material layer disposed between the pinned magnetic layer and the free magnetic layer, and a top capping layer. The pinned magnetic layer includes a first magnetic layer, a second magnetic layer, and a nonmagnetic intermediate layer disposed therebetween. A first magnetization of the first magnetic layer is pinned in antiparallel with a second magnetization of the second magnetic layer. The capping layer is formed of tantalum, and an as-deposited thickness of the capping layer is 55 ? or more.Type: ApplicationFiled: May 4, 2012Publication date: January 10, 2013Applicant: ALPS ELECTRIC CO., LTD.Inventors: Fumihito KOIKE, Kota ASATSUMA, Kazuya OMINATO
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Publication number: 20120217962Abstract: A magnetic sensor having no sensitivity differences between sensitivity axes, and an easy manufacturing method therefor are provided. The method includes a process of forming first stacked films for a magnetoresistive element on a substrate. This element has a sensitivity axis in a certain direction and includes a self-pinned ferromagnetic pinned layer in which first and second ferromagnetic films are antiferromagnetically coupled through an antiparallel coupling layer, a nonmagnetic intermediate layer, and a soft magnetic free layer. The method further includes a process of removing a region of the first stacked films from the substrate. The remaining region of the films includes at least a region to be left to form the element. The method furthermore includes a process of forming second stacked films for a magnetoresistive element, which has a sensitivity axis in a direction different from the certain direction and has the same structure, on the exposed substrate.Type: ApplicationFiled: May 8, 2012Publication date: August 30, 2012Applicant: ALPS ELECTRIC CO., LTD.Inventors: Hideto ANDO, Shinji SUGIHARA, Fumihito KOIKE, Kota ASATSUMA
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Publication number: 20120032673Abstract: First magnetoresistive effect elements and second magnetoresistive effect elements and are formed on the same substrate. A pinned magnetic layer of each of the first magnetoresistive effect elements has a three-layer laminated ferrimagnetic structure including magnetic layers. A pinned magnetic layer of each of the second magnetoresistive effect elements has a two-layer laminated ferrimagnetic structure including magnetic layers. The magnetization direction of the third magnetic layer of each of the magnetoresistive effect elements is antiparallel to the magnetization direction of the second magnetic layer of each of the second magnetoresistive effect elements.Type: ApplicationFiled: October 14, 2011Publication date: February 9, 2012Applicant: ALPS ELECTRIC CO., LTD.Inventors: Shuji MAEKAWA, Kota ASATSUMA, Fumihito KOIKE, Hideto ANDO
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Patent number: 8009391Abstract: An underlying layer is composed of Co—Fe—B that is an amorphous magnetic material. Thus, the upper surface of the underlying layer can be taken as a lower shield layer-side reference position for obtaining a gap length (GL) between upper and lower shields, resulting in a narrower gap than before. In addition, since the underlying layer has an amorphous structure, the underlying layer does not adversely affect the crystalline orientation of individual layers to be formed thereon, and the surface of the underlying layer has good planarizability. Accordingly, PW50 (half-amplitude pulse width) and SN ratio can be improved more than before without causing a decrease in rate of change in resistance (? R/R) or the like, thereby achieving a structure suitable for increasing recording density.Type: GrantFiled: May 15, 2008Date of Patent: August 30, 2011Assignee: TDK CorporationInventors: Kenichi Tanaka, Eiji Umetsu, Kazuaki Ikarashi, Kota Asatsuma, Norimasa Okanishi, Yoshihiro Nishiyama, Masamichi Saito, Yosuke Ide, Kazumasa Nishimura, Ryo Nakabayashi, Hidekazu Kobayashi, Akio Hanada, Naoya Hasegawa
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Publication number: 20080285180Abstract: An underlying layer is composed of Co—Fe—B that is an amorphous magnetic material. Thus, the upper surface of the underlying layer can be taken as a lower shield layer-side reference position for obtaining a gap length (GL) between upper and lower shields, resulting in a narrower gap than before. In addition, since the underlying layer has an amorphous structure, the underlying layer does not adversely affect the crystalline orientation of individual layers to be formed thereon, and the surface of the underlying layer has good planarizability. Accordingly, PW50 (half-amplitude pulse width) and SN ratio can be improved more than before without causing a decrease in rate of change in resistance (? R/R) or the like, thereby achieving a structure suitable for increasing recording density.Type: ApplicationFiled: May 15, 2008Publication date: November 20, 2008Inventors: Kenichi Tanaka, Eiji Umetsu, Kazuaki Ikarashi, Kota Asatsuma, Norimasa Okanishi, Yoshihiro Nishiyama, Masamichi Saito, Yosuke Ide, Kazumasa Nishimura, Ryo Nakabayashi, Hidekazu Kobayashi, Akio Hanada, Naoya Hasegawa
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Publication number: 20080174921Abstract: A second fixed magnetic layer is formed of a CoFeB layer of CoFeB and an interface layer of CoFe or Co provided in that order from the bottom. An insulating barrier layer composed of Al—O is formed on the second fixed magnetic layer. When a lamination structure composed of CoFeB/CoFe/Al—O is formed as described above, a low RA and a high rate of change in resistance (?R/R) can be simultaneously obtained. In addition, variations in RA and rate of change in resistance (?R/R) can be suppressed as compared to that in the past.Type: ApplicationFiled: September 21, 2007Publication date: July 24, 2008Inventors: Kazuaki Ikarashi, Eiji Umetsu, Kenichi Tanaka, Kota Asatsuma
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Publication number: 20080151438Abstract: The invention provides a magnetoresistive element including a seed layer having a flat surface, which makes it possible to improve the flatness of all of the elements. A seed layer is formed in a two-layer structure of a first seed layer that is formed on a lower shield layer and a second seed layer that is formed underneath an anti-ferromagnetic layer, and the second seed layer is formed of ruthenium (Ru). According to this structure, the flatness of the surface of the seed layer is improved, which makes it possible to improve the flatness of interfaces between layers of an element formed on the seed layer. As a result, it is possible to manufacture a magnetoresistive element having a high dielectric breakdown voltage and high operational reliability.Type: ApplicationFiled: November 28, 2007Publication date: June 26, 2008Inventors: Kenichi Tanaka, Eiji Umetsu, Kazuaki Ikarashi, Kota Asatsuma