Patents by Inventor Hiroyasu Kataoka
Hiroyasu Kataoka 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: 20240159243Abstract: A pump device according to one embodiment includes a pump and a symbol. The pump includes at least one pump structure and a suction port, wherein a displacement of the at least one pump structure, the displacement being a delivery amount per rotation, changes in accordance with a command current. The symbol is displayed on a surface of the pump, the surface facing in a direction different from a direction in which the suction port is open. The symbol stores actual measurement data or save location information on the actual measurement data, the actual measurement data indicating an actual relationship between the command current and the displacement of the at least one pump structure.Type: ApplicationFiled: November 3, 2023Publication date: May 16, 2024Applicant: KAWASAKI JUKOGYO KABUSHIKI KAISHAInventors: Akihiro KONDO, Hiroyasu KODERA, Yousuke KATAOKA
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Patent number: 11120829Abstract: A magnetic recording medium with a reduced average grain diameter and reduced grain diameter dispersion is provided. A magnetic recording medium having a magnetic property (magnetic anisotropy energy) applicable as a magnetic recording medium is provided. It is a magnetic recording medium containing a substrate, a grain diameter control layer, a first seed layer, a second seed layer, and a magnetic recording layer containing an ordered alloy in this order, in which the second seed layer is composed of crystal grains having TiN as a main component, and a grain boundary material having at least one or more selected from the group consisting of metal oxides and carbon as a main component.Type: GrantFiled: February 27, 2019Date of Patent: September 14, 2021Assignee: FUJI ELECTRIC CO., LTD.Inventors: Hiroyasu Kataoka, Tsuyoshi Yoshizawa, Tomohiro Moriya, Shinji Uchida, Hirohisa Oyama, Takehito Shimatsu
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Patent number: 10566019Abstract: The purpose of the present invention is to provide a magnetic recording medium capable of reducing the surface roughness of the magnetic recording layer without adversely affecting the magnetic properties of the magnetic recording layer. The magnetic recording medium of the present invention includes a substrate, a seed layer on the substrate, and a magnetic recording layer on the seed layer, wherein the seed layer has a structure of: (a) a spinel structure consisting of Mg, Cr and O; (b) a spinel structure consisting of Zn, Fe and O; or (c) an inverse spinel structure consisting of Mg, Ti and O.Type: GrantFiled: June 1, 2017Date of Patent: February 18, 2020Assignee: Fuji Electric Co., Ltd.Inventors: Hiroyasu Kataoka, Hiroto Kikuchi, Akira Furuta, Hitoshi Nakata, Tomohiro Moriya, Takehito Shimatsu
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Publication number: 20190287563Abstract: In a perpendicular magnetic recording medium and a method of manufacturing the same, a first magnetic recording layer includes first magnetic crystal grains and a first non-magnetic portion containing carbon, a second magnetic recording layer includes second magnetic crystal grains and a second non-magnetic portion containing ZnO, a third magnetic recording layer includes third magnetic crystal grains and a third non-magnetic portion containing carbon, a film thickness t2 of the second magnetic recording layer is 0.1 nm to 7.0 nm, a volume fraction x2 of the second non-magnetic portion in the second magnetic recording layer at completion of formation is 0.20 to 0.90, a film thickness t3 of the third magnetic recording layer is 0.5 nm to 4.0 nm, a volume fraction x3 of the third non-magnetic portion in the third magnetic recording layer is 0.20 to 0.70, and (t2/t3)×(x2/x3) is 0.30 to 1.20.Type: ApplicationFiled: January 31, 2019Publication date: September 19, 2019Applicants: FUJI ELECTRIC CO., LTD., TOHOKU UNIVERSITYInventors: Hiroyasu KATAOKA, Hiroto KIKUCHI, Akira FURUTA, Takehito SHIMATSU
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Publication number: 20190198051Abstract: A magnetic recording medium with a reduced average grain diameter and reduced grain diameter dispersion is provided. A magnetic recording medium having a magnetic property (magnetic anisotropy energy) applicable as a magnetic recording medium is provided. It is a magnetic recording medium containing a substrate, a grain diameter control layer, a first seed layer, a second seed layer, and a magnetic recording layer containing an ordered alloy in this order, in which the second seed layer is composed of crystal grains having TiN as a main component, and a grain boundary material having at least one or more selected from the group consisting of metal oxides and carbon as a main component.Type: ApplicationFiled: February 27, 2019Publication date: June 27, 2019Applicant: FUJI ELECTRIC CO., LTD.Inventors: Hiroyasu KATAOKA, Tsuyoshi YOSHIZAWA, Tomohiro MORIYA, Shinji UCHIDA, Hirohisa OYAMA, Takehito SHIMATSU
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Patent number: 10276200Abstract: The purpose of the invention is to provide a magnetic recording medium in which the surface roughness of the magnetic recording layer can be reduced without deterioration of the magnetic properties of the magnetic recording layer. The magnetic recording medium of the present invention includes a substrate, a seed layer on the substrate, and a magnetic recording layer on the seed layer, wherein the seed layer contains Mn, Cr, and O, and has a spinel structure.Type: GrantFiled: October 28, 2016Date of Patent: April 30, 2019Assignee: Fuji Electric Co., Ltd.Inventors: Tomohiro Moriya, Hitoshi Nakata, Hiroyasu Kataoka, Hiroto Kikuchi, Akira Furuta, Takehito Shimatsu
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Patent number: 10115424Abstract: The present invention provides a magnetic recording layer that has a high magnetic anisotropy constant Ku and a low Curie temperature Tc, as well as a magnetic recording medium that incorporates such a magnetic recording layer. The magnetic recording medium of the present invention includes a nonmagnetic substrate and a magnetic recording layer containing an ordered alloy. The ordered alloy may contain at least one element selected from the group consisting of Fe and Ni; at least one element selected from the group consisting of Pt, Pd, Au, Rh and Ir; and Ru.Type: GrantFiled: April 8, 2016Date of Patent: October 30, 2018Assignee: FUJI ELECTRIC CO., LTD.Inventors: Tomohiro Moriya, Hitoshi Nakata, Hiroto Kikuchi, Hiroyasu Kataoka, Akira Furuta, Takehito Shimatsu
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Patent number: 10062404Abstract: A method for manufacturing perpendicular magnetic recording medium which includes magnetic recording layer having desired film thickness while maintaining high magnetic anisotropy and having more homogenized magnetic characteristics. The method includes: (A) preparing non-magnetic substrate; (B) laminating magnetic recording layer on the substrate; and (C) heating the substrate on which the magnetic recording layer is laminated to a temperature of 400 to 600° C. The step (B) includes at least forming a first magnetic recording layer and a second magnetic layer thereon. The first layer has a granular structure including a first magnetic crystal grain constituted by an ordered alloy surrounded by a first non-magnetic grain boundary constituted by carbon, and the second layer has a granular structure including a second magnetic crystal grain constituted by an ordered alloy surrounded by a second non-magnetic grain boundary constituted by a non-magnetic material constituted by boron and carbon.Type: GrantFiled: May 12, 2015Date of Patent: August 28, 2018Assignee: Fuji Electric Co., Ltd.Inventors: Hiroyasu Kataoka, Hiroto Kikuchi, Akira Furuta, Takehito Shimatsu
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Publication number: 20170270955Abstract: The purpose of the present invention is to provide a magnetic recording medium capable of reducing the surface roughness of the magnetic recording layer without adversely affecting the magnetic properties of the magnetic recording layer. The magnetic recording medium of the present invention includes a substrate, a seed layer on the substrate, and a magnetic recording layer on the seed layer, wherein the seed layer has a structure of: (a) a spinel structure consisting of Mg, Cr and O; (b) a spinel structure consisting of Zn, Fe and O; or (c) an inverse spinel structure consisting of Mg, Ti and O.Type: ApplicationFiled: June 1, 2017Publication date: September 21, 2017Inventors: Hiroyasu Kataoka, Hiroto Kikuchi, Akira Furuta, Hitoshi Nakata, Tomohiro Moriya, Takehito Shimatsu
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Publication number: 20170206919Abstract: The purpose of the present invention is to provide a magnetic recording medium making secondary growth of magnetic crystal grains inhibited, having a magnetic recording layer having a large film thickness, and exhibiting excellent magnetic characteristics, and to provide a method for producing the medium. A magnetic recording medium according to the present invention includes a substrate and a magnetic recording layer that includes a lower layer and an upper layer, in which the lower layer and the upper layer include magnetic crystal grains formed of an ordered alloy and non-magnetic grain boundaries, the lower layer is formed by depositing Bi, C and an element constituting the ordered alloy, and the upper layer is formed by depositing C and an element constituting the ordered alloy. The present invention also provides a method for producing the above-described magnetic recording medium.Type: ApplicationFiled: March 31, 2017Publication date: July 20, 2017Inventors: Akira Furuta, Hiroto Kikuchi, Hiroyasu Kataoka, Takehito Shimatsu
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Patent number: 9672855Abstract: A perpendicular magnetic recording medium includes at least a nonmagnetic substrate and a magnetic recording layer. The magnetic recording layer is constituted by a plurality of layers that includes at least a first magnetic recording layer and a second magnetic recording layer. The first magnetic recording layer has a granular structure that includes first magnetic crystal grains and first nonmagnetic crystal grain boundaries surrounding the first magnetic crystal grains. The first magnetic crystal grains include an ordered alloy, and the first nonmagnetic crystal grain boundaries are constituted by carbon. The second magnetic recording layer has a granular structure that includes second magnetic crystal grains and a second nonmagnetic crystal grain boundaries that surround the second magnetic crystal grains. The second magnetic crystal grains include an ordered alloy, and the second nonmagnetic crystal grain boundaries are constituted by a carbon-containing nonmagnetic material.Type: GrantFiled: December 4, 2014Date of Patent: June 6, 2017Assignee: FUJI ELECTRIC CO., LTD.Inventors: Hiroyasu Kataoka, Hiroto Kikuchi, Akira Furuta, Shinji Uchida, Takehito Shimatsu
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Publication number: 20170125050Abstract: A method for manufacturing perpendicular magnetic recording medium which includes magnetic recording layer having desired film thickness while maintaining high magnetic anisotropy and having more homogenized magnetic characteristics. The method includes: (A) preparing non-magnetic substrate; (B) laminating magnetic recording layer on the substrate; and (C) heating the substrate on which the magnetic recording layer is laminated to a temperature of 400 to 600° C. The step (B) includes at least forming a first magnetic recording layer and a second magnetic layer thereon. The first layer has a granular structure including a first magnetic crystal grain constituted by an ordered alloy surrounded by a first non-magnetic grain boundary constituted by carbon, and the second layer has a granular structure including a second magnetic crystal grain constituted by an ordered alloy surrounded by a second non-magnetic grain boundary constituted by a non-magnetic material constituted by boron and carbon.Type: ApplicationFiled: May 12, 2015Publication date: May 4, 2017Inventors: Hiroyasu Kataoka, Hiroto Kikuchi, Akira Furuta, Takehito Shimatsu
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Publication number: 20170047090Abstract: The purpose of the invention is to provide a magnetic recording medium in which the surface roughness of the magnetic recording layer can be reduced without deterioration of the magnetic properties of the magnetic recording layer. The magnetic recording medium of the present invention includes a substrate, a seed layer on the substrate, and a magnetic recording layer on the seed layer, wherein the seed layer contains Mn, Cr, and O, and has a spinel structure.Type: ApplicationFiled: October 28, 2016Publication date: February 16, 2017Inventors: Tomohiro Moriya, Hitoshi Nakata, Hiroyasu Kataoka, Hiroto Kikuchi, Akira Furuta, Takehito Shimatsu
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Publication number: 20160225394Abstract: The present invention provides a magnetic recording layer that has a high magnetic anisotropy constant Ku and a low Curie temperature Tc, as well as a magnetic recording medium that incorporates such a magnetic recording layer. The magnetic recording medium of the present invention includes a nonmagnetic substrate and a magnetic recording layer containing an ordered alloy. The ordered alloy may contain at least one element selected from the group consisting of Fe and Ni; at least one element selected from the group consisting of Pt, Pd, Au, Rh and Ir; and Ru.Type: ApplicationFiled: April 8, 2016Publication date: August 4, 2016Applicant: FUJI ELECTRIC CO., LTD.Inventors: Tomohiro MORIYA, Hitoshi NAKATA, Hiroto KIKUCHI, Hiroyasu KATAOKA, Akira FURUTA, Takehito SHIMATSU
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Publication number: 20150132608Abstract: A perpendicular magnetic recording medium includes at least a nonmagnetic substrate and a magnetic recording layer. The magnetic recording layer is constituted by a plurality of layers that includes at least a first magnetic recording layer and a second magnetic recording layer. The first magnetic recording layer has a granular structure that includes first magnetic crystal grains and first nonmagnetic crystal grain boundaries surrounding the first magnetic crystal grains. The first magnetic crystal grains include an ordered alloy, and the first nonmagnetic crystal grain boundaries are constituted by carbon. The second magnetic recording layer has a granular structure that includes second magnetic crystal grains and a second nonmagnetic crystal grain boundaries that surround the second magnetic crystal grains. The second magnetic crystal grains include an ordered alloy, and the second nonmagnetic crystal grain boundaries are constituted by a carbon-containing nonmagnetic material.Type: ApplicationFiled: December 4, 2014Publication date: May 14, 2015Applicant: FUJI ELECTRIC CO., LTD.Inventors: Hiroyasu KATAOKA, Hiroto KIKUCHI, Akira FURUTA, Shinji UCHIDA, Takehito SHIMATSU
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Patent number: 8076012Abstract: Disclosed are a magnetic thin film capable of providing a high uniaxial magnetic anisotropy, Ku, while suppressing the saturation magnetization Ms thereof, and a method for forming the film; and also disclosed are various devices to which the magnetic thin film is applied. The magnetic thin film comprises a Co-M-Pt alloy having an L11-type ordered structure (wherein M represents one or more metal elements except Co and Pt). For example, the Co-M-Pt alloy is a Co—Ni—Pt alloy of which the composition comprises from 10 to 35 at. % of Co, from 20 to 55 at. % of Ni and a balance of Pt. The magnetic thin film is applicable to perpendicular magnetic recording media, tunnel magneto-resistance (TMR) devices, magnetoresistive random access memories (MRAM), microelectromechanical system (MEMS) devices, etc.Type: GrantFiled: July 28, 2009Date of Patent: December 13, 2011Assignees: Tohoku University, Fuji Electric Co., Ltd.Inventors: Takehito Shimatsu, Hideo Sato, Osamu Kitakami, Satoshi Okamoto, Hajime Aoi, Hiroyasu Kataoka
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Patent number: 7993762Abstract: The present invention relates to a magnetic thin film containing a L11 type Co—Pt—C alloy in which atoms are orderly arranged, and can realize an order degree excellent in regard to the L11 type Co—Pt—C alloy to achieve excellent magnetic anisotropy of the magnetic thin film. Therefore, in the various application devices using the magnetic thin film, it is possible to achieve a large capacity process and/or a high density process thereof in a high level.Type: GrantFiled: December 4, 2009Date of Patent: August 9, 2011Assignees: Tohoku University, Fuji Electric Device Technology Co., Ltd.Inventors: Takehito Shimatsu, Hideo Sato, Osamu Kitakami, Satoshi Okamoto, Hajime Aoi, Hiroyasu Kataoka
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Publication number: 20110020669Abstract: A magnetic recording medium having excellent stability of recorded magnetic signals and capable of recording magnetic signals by a thermally assisted magnetic recording system in which a magnetic recording layer of the magnetic recording medium contains ferromagnetic crystal grains of a Co—Ni—Pt alloy with a Pt content of 44 at % or more and 55 at % or less and with an atom content ratio: Ni/(Co+Ni) of 0.64 or more and 0.8 or less. The magnetic recording medium has extremely excellent stability of recorded magnetic signals since the Co—Ni—Pt alloy constituting the magnetic recording layer has an extremely high anisotropy field at a normal temperature. Further, the magnetic recording medium can perform signal recording based on the thermally assisted magnetic recording system since the Co—Ni—Pt alloy constituting the magnetic recording layer has a Curie point within an appropriate temperature range.Type: ApplicationFiled: July 21, 2010Publication date: January 27, 2011Inventors: Junichi SAYAMA, Hiroaki Nemoto, Hiroshi Ide, Hiroyasu Kataoka, Nobuyukl Takahashi, Takehito Shimatsu, Osamu Kitakami, Satoshi Okamoto, Hajime Aoi
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Publication number: 20100140727Abstract: The present invention relates to a magnetic thin film containing a L11 type Co—Pt—C alloy in which atoms are orderly arranged, and can realize an order degree excellent in regard to the L11 type Co—Pt—C alloy to achieve excellent magnetic anisotropy of the magnetic thin film. Therefore, in the various application devices using the magnetic thin film, it is possible to achieve a large capacity process and/or a high density process thereof in a high level.Type: ApplicationFiled: December 4, 2009Publication date: June 10, 2010Applicants: Tohoku University, Fuji Electric Device Technology Co., Ltd.Inventors: Takehito SHIMATSU, Hideo SATO, Osamu KITAKAMI, Satoshi OKAMOTO, Hajime AOI, Hiroyasu KATAOKA
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Publication number: 20100055503Abstract: Disclosed are a magnetic thin film capable of providing a high uniaxial magnetic anisotropy, Ku, while suppressing the saturation magnetization Ms thereof, and a method for forming the film; and also disclosed are various devices to which the magnetic thin film is applied. The magnetic thin film comprises a Co-M-Pt alloy having an L11-type ordered structure (wherein M represents one or more metal elements except Co and Pt). For example, the Co-M-Pt alloy is a Co—Ni—Pt alloy of which the composition comprises from 10 to 35 at. % of Co, from 20 to 55 at. % of Ni and a balance of Pt. The magnetic thin film is applicable to perpendicular magnetic recording media, tunnel magneto-resistance (TMR) devices, magnetoresistive random access memories (MRAM), microelectromechanical system (MEMS) devices, etc.Type: ApplicationFiled: July 28, 2009Publication date: March 4, 2010Applicants: TOHOKU UNIVERSITY, FUJI ELECTRIC DEVICE TECHNOLOGY CO., LTD.Inventors: Takehito SHIMATSU, Hideo SATO, Osamu KITAKAMI, Satoshi OKAMOTO, Hajime AOI, Hiroyasu KATAOKA