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公开(公告)号：US20220081319A1
公开(公告)日：2022-03-17
申请号：US17419346
申请日：2020-02-04
发明人： Shin-ichi OHKOSHI , Asuka NAMAI , Marie YOSHIKIYO , Daisuke KODAMA , Shiho OBATA , Masahiro GOTOH
摘要： An iron-based oxide magnetic powder has good thermal stability and a small change in coercive force even in a high-temperature environment and is one composed of particles of ε-iron oxide in which Fe sites are partially substituted by another metal element. A production method for such an iron-based oxide magnetic powder includes allowing a phosphorus-containing ion to coexist when a precipitate of an iron hydroxide containing a substituent metal element produced by neutralizing an acidic aqueous solution containing a trivalent iron ion and an ion of a metal that partially substitutes Fe sites is coated with silicon oxide using a silane compound.
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公开(公告)号：US20210300779A1
公开(公告)日：2021-09-30
申请号：US16979241
申请日：2019-03-26
发明人： Shin-ichi OHKOSHI , Asuka NAMAI , Kenji SAKANE , Tetsuya KAWAHITO
摘要： [Problem] To provide a method for producing iron based oxide magnetic powder that has a narrow particle size distribution and a small content of fine particles that do not contribute to the magnetic recording characteristics, and consequently has a narrow coercive force distribution and is suitable for the enhancement of the recording density of the magnetic recording medium. [Solution] ε-Type iron based oxide magnetic powder is obtained by a wet method, then a tetraalkylammonium salt as a surface modifier is added to a slurry containing the magnetic powder to make a concentration of 0.009 mol/kg or more and 1.0 mol/kg or less, and simultaneously to make pH of 11 or more and 14 or less, and the slurry is subjected to a dispersion treatment and then classified, so as to provide iron based oxide magnetic powder having a narrow particle size distribution and a narrow coercive force distribution.
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3.发明申请公开(公告)号：US20210012936A1
公开(公告)日：2021-01-14
申请号：US16969839
申请日：2019-02-14
发明人： Shin-ichi OHKOSHI , Asuka NAMAI , Marie YOSHIKIYO , Masahiro GOTOH , Toshihiko UEYAMA , Takayuki YOSHIDA
摘要： There is provided a magnetic material that has an excellent electromagnetic wave absorption performance in a wide frequency range even under low temperature and high temperature environments and that ensures the absorption performance, and provided a magnetic material as a mixture of a magnetic material having positive slope of change in coercive force dependent on temperature, and a magnetic material having negative slope of change in coercive force dependent on temperature.
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4.发明申请公开(公告)号：US20180170767A1
公开(公告)日：2018-06-21
申请号：US15735410
申请日：2016-06-13
发明人： Shin-ichi OHKOSHI , Syunsuke OKA , Asuka NAMAI , Kenji MASADA
摘要： An epsilon iron oxide has an average particle size of 10 to 18 nm, a part of the iron element being substituted with a substitutional element and has a coercive force of 14 kOe or less, wherein a coefficient of variation of the particle size is 40% or less. A method for producing the same, a magnetic coating material and a magnetic recording medium using the epsilon iron oxide, includes depositing a metal compound of a substitutional element on iron oxide hydroxide to thereby obtain iron oxide hydroxide on which the metal compound is deposited; coating the iron oxide hydroxide on which the metal compound is deposited, with silicon oxide to thereby obtain iron oxide hydroxide coated with the silicon oxide; and applying heat treatment to the silicon oxide-coated iron oxide hydroxide in an oxidizing atmosphere, wherein a part of an iron element is substituted with the substitutional element.
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5.发明申请公开(公告)号：US20180366151A1
公开(公告)日：2018-12-20
申请号：US15780057
申请日：2016-11-30
发明人： Shin-ichi OHKOSHI , Kenta IMOTO , Shizuka ANAN , Asuka NAMAI , Kenji MASADA
摘要： There is provided an oriented body containing platinum group-substituted-6 iron oxide particles typified by Rh-substituted ϵ-iron oxide or Ru-substituted ϵ-iron oxide applicable to MAMR, MIMR, or F-MIMR system, and a technique related thereto, containing platinum group element-substituted ϵ-iron oxide particles in which a part of ϵ-iron oxide is substituted with at least one element of platinum group elements, as magnetic particles wherein the degree of orientation of the magnetic particles defined by the degree of orientation=SQ (direction of magnetization easy-axes)/SQ (direction of magnetization hard-axes) exceeds 5.0, and a coercive force exceeds 31 kOe.
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6.发明申请METHOD FOR IMPROVING COERCIVE FORCE OF EPSILON-TYPE IRON OXIDE, AND EPSILON-TYPE IRON OXIDE 审中-公开改善EPSILON型氧化铁和EPSILON型氧化铁的强化力的方法公开(公告)号：US20160343484A1
公开(公告)日：2016-11-24
申请号：US15231122
申请日：2016-08-08
发明人： Shin-ichi OHKOSHI , Shunsuke SAKURAI , Asuka NAMAI , Sayaka UMEDA , Hiroshi HACHIYA , Kazuyuki MATSUMOTO , Takashi GOTOH
CPC分类号： H01F1/047 , C01G49/0018 , C01G49/06 , C01P2002/50 , C01P2002/52 , C01P2006/42 , C04B35/26 , C04B35/62826 , C04B2235/3217 , C04B2235/3286 , C04B2235/3289 , C04B2235/3418 , C04B2235/761 , H01F1/10
摘要： An epsilon-type iron oxide having an Fe-site that is substituted with a platinum group element, provided that Fe of a D-site of the epsilon-type iron oxide is not substituted with the platinum group element.
摘要翻译： 具有被铂族元素取代的Fe部位的ε型氧化铁，只要ε型氧化铁的D位的Fe未被铂族元素取代。
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公开(公告)号：US20190035521A1
公开(公告)日：2019-01-31
申请号：US16070902
申请日：2017-01-19
摘要： There is provided a magnetic substance containing substituted ε-iron oxide particles applicable as a magnetic toner of one-component development system, and a technique related thereto, which is the magnetic substance containing substituted ε-iron oxide particles in which a part of ε-iron oxide is substituted with a metal element other than iron, and satisfying at least one of the following conditions: (Condition 1) A molar extinction coefficient of a magnetic substance dispersion liquid at a wavelength of 450 nm is less than 770 dm3 mol−1 cm−1. (Condition 2) A molar extinction coefficient of the magnetic substance dispersion liquid at a wavelength of 500 nm is less than 430 dm3 mol−1 cm−1.
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8.发明申请公开(公告)号：US20170349448A1
公开(公告)日：2017-12-07
申请号：US15544147
申请日：2016-01-18
发明人： Shin-ichi OHKOSHI , Hiroko TOKORO , Koji NAKABAYASHI , Asuka NAMAI , Kenta IMOTO , Kenji MASADA
摘要： There are provided an oriented body such as a magnetic sheet in which a value of degree of orientation of magnetic particles is beyond 3.5, and a method for producing the same, and a device for producing the same, wherein the oriented body such as a magnetic sheet is produced through the steps of: mixing a mixed solution containing a solvent and a vehicle and ε-iron oxide particles by shaking stirring, and dispersing the ε-iron oxide particles in the mixed solution; providing a mixed solution in which the ε-iron oxide particles are dispersed, on a predetermined substrate; and removing the solvent while applying a magnetic field to the substrate provided with the mixed solution, to obtain an oriented body.
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公开(公告)号：US20170137302A1
公开(公告)日：2017-05-18
申请号：US15318783
申请日：2015-06-18
发明人： Shin-ichi OHKOSHI , Marie YOSHIKIYO , Asuka NAMAI , Hiroko TOKORO , Waka TARORA , Tomomichi NASU , Takayuki YOSHIDA , Manabu TANAKA
CPC分类号： C01G49/06 , C01P2002/72 , C01P2002/77 , C01P2002/90 , C01P2006/42 , G11B5/706 , G11B5/714 , G11B5/84 , H01F1/11
摘要： A magnetic σ-form iron oxide nanopowder is a novel magnetic iron oxide nanopowder having magnetic polarization and spontaneous electric polarization and having physical properties similar to those of half-metals; and a process produces the magnetic nanopowder. The magnetic powder has a composition represented by Fe2O3 and has a crystal structure belonging to the monoclinic system.
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公开(公告)号：US20230307844A1
公开(公告)日：2023-09-28
申请号：US17996704
申请日：2021-05-13
CPC分类号： H01Q17/00 , C08J5/18 , C08K3/041 , C08K3/22 , C08K3/34 , C08K3/38 , C09K5/14 , H05K9/0081 , C08J2375/06 , C08K2003/2227 , C08K2003/2265 , C08K2003/385 , C08K2201/001 , C08K2201/011 , C08K2201/014
摘要： A radio wave absorber with which it is possible to obtain both excellent radio wave absorption characteristics in a high-frequency band and excellent heat dissipation characteristics, and a radio wave absorber formation paste suitable for use in producing the radio wave absorber. The radio wave absorber includes a composite layer made of a radio wave absorption material and a thermally conductive material, the radio wave absorption material includes one or more types of an ε-Fe2O3 crystal; and a crystal in which the crystal and the space group are identical to those of ε-Fe2O3 and a part of an Fe site of the ε-Fe2O3 is substituted with an element M other than Fe, and that is represented by the formula ε-MxFe2-xO3 in which x is greater than 0 and less than 2.
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