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公开(公告)号：US20170287517A1
公开(公告)日：2017-10-05
申请号：US15475615
申请日：2017-03-31
Applicant: FUJIFILM Corporation
Inventor： Yoichi HOSOYA , Masashi SHIRATA
CPC classification number: G11B5/70615 , B82Y25/00 , G11B5/70678 , G11B5/714 , G11B5/78 , H01F1/0063 , H01F1/11
Abstract: Hexagonal ferrite powder has an average particle size falling within a range of 10 nm to 50 nm, a switching field distribution SFD23° C. measured at a temperature of 23° C. that is less than or equal to 0.80, and a ratio of a switching field distribution SFD−190° C. that is measured at a temperature of −190° C. to the SFD23° C. (SFD−190° C./SFD23° C.) that is greater than 0.80.
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12.发明申请公开(公告)号：US20200075052A1
公开(公告)日：2020-03-05
申请号：US16555571
申请日：2019-08-29
Applicant: FUJIFILM Corporation
Inventor： Kenji NAOI , Masashi SHIRATA , Wataru KIKUCHI
Abstract: The magnetic recording medium includes a non-magnetic support; and a magnetic layer including a ferromagnetic powder and a binding agent on the non-magnetic support, in which the magnetic layer further includes a compound including one or more partial structures selected from the group consisting of a partial structure represented by Formula 1 and a partial structure represented by Formula 2, and a polyalkyleneimine chain. A magnetic recording and reproducing apparatus including this magnetic recording medium. A composition for a magnetic recording medium including a ferromagnetic powder and the compound. L1 in Formula 1 and L2 in Formula 2 each independently represent a divalent linking group, Z1 in Formula 1 and Z2 in Formula 2 each independently represent a monovalent group represented by —OM or a monovalent group represented by —O−A+, M represents a hydrogen atom or an alkali metal atom, and A+ represents an ammonium cation.
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公开(公告)号：US20190300380A1
公开(公告)日：2019-10-03
申请号：US16251097
申请日：2019-01-18
Applicant: FUJIFILM CORPORATION
Inventor： Kenji NAOI , Takashi FUJIMOTO , Masashi SHIRATA
Abstract: Disclosed are a particle of a 13-iron oxyhydroxide-based compound represented by Formula (1), in which an average equivalent circle diameter of primary particles is 5 nm to 30 nm, and a coefficient of variation of equivalent circle diameters of the primary particles is 10% to 30% [In Formula (1), A represents at least one kind of metal element other than Fe, and a represents a number that satisfies a relationship of 0≤a
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公开(公告)号：US20180358155A1
公开(公告)日：2018-12-13
申请号：US15974797
申请日：2018-05-09
Applicant: FUJIFILM Corporation
Inventor： Kenji NAOI , Takashi FUJIMOTO , Masashi SHIRATA
IPC: H01F1/03 , H01F1/00 , C01G49/06 , C01G49/08 , C08L101/06
CPC classification number: H01F1/0315 , C01G49/06 , C01G49/08 , C01P2002/32 , C01P2004/64 , C08L101/06 , C08L2207/53 , H01F1/0054
Abstract: A core-shell particle includes: a core including an iron oxyhydroxide compound represented by Formula A3a3Fe1−a3OOH (in which A3 represents at least one metal element other than Fe, and a3 satisfies 0
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公开(公告)号：US20180358044A1
公开(公告)日：2018-12-13
申请号：US15996678
申请日：2018-06-04
Applicant: FUJIFILM Corporation
Inventor： Masashi SHIRATA , Takashi FUJIMOTO
IPC: G11B5/706
CPC classification number: G11B5/70642 , G11B5/70621
Abstract: Provided is a magnetic recording medium including: a non-magnetic support; and a magnetic layer including particles of at least one kind of epsilon type iron oxide-based compound selected from the group consisting of ε-Fe2O3 and a compound represented by Formula (1), and a binding agent, at least on one surface of the non-magnetic support, in which an average area Sdc of a magnetic cluster in a DC demagnetization state measured with a magnetic force microscope satisfies a relationship of 500 nm2
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Patent Agency Ranking
16.发明申请公开(公告)号：US20170287603A1
公开(公告)日：2017-10-05
申请号：US15627636
申请日：2017-06-20
Applicant: FUJIFILM Corporation
Inventor： Masashi SHIRATA , Yoichi HOSOYA
CPC classification number: H01F1/113 , C01B13/366 , C01G49/0036 , C01P2004/22 , C01P2004/54 , C01P2004/64 , C01P2006/12 , C01P2006/42 , G11B5/70678 , G11B5/714 , H01F1/11
Abstract: A production method for metal oxide particles includes: obtaining precursor particles of a metal oxide by performing a synthesis reaction of the precursor particles in the presence of an organic compound; and converting the obtained precursor particles into metal oxide particles by heating an aqueous solution containing the precursor particles to 300° C. or higher and pressurizing the aqueous solution at a pressure of 20 MPa or higher.
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17.发明申请METHOD OF MANUFACTURING HEXAGONAL FERRITE POWDER, HEXAGONAL FERRITE POWDER, MAGNETIC RECORDING MEDIUM AND METHOD OF MANUFACTURING MAGNETIC RECORDING MEDIUM 有权制造六角形粉末粉末，六角形粉末粉末，磁记录介质的方法和制造磁记录介质的方法公开(公告)号：US20170004912A1
公开(公告)日：2017-01-05
申请号：US15196859
申请日：2016-06-29
Applicant: FUJIFILM Corporation
Inventor： Masashi SHIRATA
CPC classification number: C01G49/0036 , C01G49/06 , C01P2004/64 , C01P2006/42 , C04B35/2683 , C04B35/632 , C04B2235/3213 , C04B2235/3215 , C04B2235/5454 , C04B2235/5481 , C04B2235/767 , G11B5/70678 , H01F1/11
Abstract: The method of manufacturing hexagonal ferrite powder includes preparing a hexagonal ferrite precursor by mixing an iron salt and a divalent metal salt in a water-based solution, and converting the hexagonal ferrite precursor into hexagonal ferrite within a reaction flow passage, within which a fluid flowing therein is subjected to heating and pressurizing, by continuously feeding a water-based solution containing the hexagonal ferrite precursor and gelatin to the reaction flow passage.
Abstract translation: 制造六角铁氧体粉末的方法包括通过在水性溶液中混合铁盐和二价金属盐来制备六方晶系铁氧体前体，并将六方晶系铁氧体前体转化成反应流道内的六方铁素体， 通过将含有六方晶系铁氧体前体和明胶的水性溶液连续地供给反应流路，对其进行加热加压。
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公开(公告)号：US20220061198A1
公开(公告)日：2022-02-24
申请号：US17518825
申请日：2021-11-04
Applicant: FUJIFILM Corporation
Inventor： Masashi SHIRATA , Hirokazu HASHIMOTO
Abstract: There is provided a radio wave absorber including a powder of a hexagonal ferrite; and a binder, in which the radio wave absorber has a squareness ratio in a range of 0.40 to 0.60.
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公开(公告)号：US20210375314A1
公开(公告)日：2021-12-02
申请号：US17401326
申请日：2021-08-13
Applicant: The University of Tokyo , OSAKA UNIVERSITY , FUJIFILM Corporation
Inventor： Shin-ichi OHKOSHI , Marie YOSHIKIYO , Kenta IMOTO , Kosuke NAKAGAWA , Asuka NAMAI , Hiroko TOKORO , Makoto NAKAJIMA , Masashi SHIRATA , Kenji NAOI
IPC: G11B11/105 , G11B5/706
Abstract: Provided is a recording device. The recording device includes: an external magnetic field application unit that is configured to apply an external magnetic field to a magnetic recording medium; a light irradiation unit that is configured to irradiate light; and a light focusing unit that is configured to focus the light from the light irradiation unit by resonating the light to generate an enhanced magnetic field in which a magnetic field of the light is enhanced, in which magnetization of the magnetic recording medium is inverted by applying the external magnetic field and the enhanced magnetic field to the magnetic recording medium.
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公开(公告)号：US20210027806A1
公开(公告)日：2021-01-28
申请号：US17035077
申请日：2020-09-28
Applicant: THE UNIVERSITY OF TOKYO , OSAKA UNIVERSITY , FUJIFILM Corporation
Inventor： Shin-ichi OHKOSHI , Makoto NAKAJIMA , Masashi SHIRATA , Hiroaki DOSHITA
Abstract: The present invention provides a recording method and a recording device in which information can be easily recorded even in a magnetic recording medium using epsilon iron oxide particles having a high coercive force as a magnetic recording material. A recording device of the invention applies an external magnetic field H0 that inclines magnetization of epsilon iron oxide particles to a particle dispersion element containing epsilon iron oxide particles, and irradiates the particle dispersion element with light that excites the magnetization. Accordingly, the recording device is capable of inverting magnetization that is not capable of being inverted only by the external magnetic field, in accordance with a synergetic effect between the inclination of the magnetization and the light excitation of the magnetization.
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