公开(公告)号：US20210375314A1

公开(公告)日：2021-12-02

申请号：US17401326

申请日：2021-08-13

申请人： The University of Tokyo ,  OSAKA UNIVERSITY ,  FUJIFILM Corporation

发明人： Shin-ichi OHKOSHI ,  Marie YOSHIKIYO ,  Kenta IMOTO ,  Kosuke NAKAGAWA ,  Asuka NAMAI ,  Hiroko TOKORO ,  Makoto NAKAJIMA ,  Masashi SHIRATA ,  Kenji NAOI

IPC分类号： G11B11/105 ,  G11B5/706

摘要： 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.

公开(公告)号：US20160104560A1

公开(公告)日：2016-04-14

申请号：US14787186

申请日：2014-04-24

申请人： THE UNIVERSITY OF TOKYO ,  DOWA ELECTONICS MATERIALS CO., LTD.

发明人： Shin-ichi OHKOSHI ,  Marie YOSHIKIYO ,  Asuka NAMAI ,  Hiroko TOKORO ,  Waka TARORA ,  Takayuki YOSHIDA ,  Manabu TANAKA

IPC分类号： H01F1/055 ,  C01G49/06

CPC分类号： H01F1/0551 ,  C01G49/06 ,  C01P2002/72 ,  C01P2004/03 ,  C01P2004/04 ,  C01P2004/64 ,  C01P2004/84 ,  C01P2006/42 ,  H01F1/0054

摘要： There is provided an iron oxide magnetic nanoparticle powder having a ferromagnetic property even if the particles have an average particle size of 15 nm or less, preferably 10 nm or less, and a method of producing the same, an iron oxide magnetic nanoparticle thin film containing the iron oxide magnetic nanoparticle powder and a method of producing the same, wherein the iron oxide magnetic nanoparticles having an ε-Fe2O3 single phase, having the average particle size of 15 nm or less, and further 10 nm or less, are generated by using β-FeO(OH) (iron oxide hydroxide) nanoparticles as a starting material, and coating the (iron oxide hydroxide) nanoparticles with silicon oxide, and applying heat treatment thereto under an atmospheric air, and further the iron oxide magnetic nanoparticle thin film is obtained by using the iron oxide magnetic nanoparticles.

摘要翻译： 即使粒子的平均粒径为15nm以下，优选为10nm以下，也提供具有铁磁特性的氧化铁磁性纳米粒子粉末及其制造方法，含有氧化铁磁性纳米粒子薄膜 氧化铁磁性纳米粒子粉末及其制造方法，其中具有平均粒径为15nm以下，进一步为10nm以下的具有“Fe”-Fe 2 O 3单相的氧化铁磁性纳米粒子，由 使用Fe（OH）（铁氧化物氢氧化物）纳米粒子作为起始材料，并用氧化硅涂覆（铁氧化物氢氧化物）纳米粒子，并在大气下进行热处理，进一步将氧化铁磁性纳米粒子薄 通过使用氧化铁磁性纳米粒子获得膜。

公开(公告)号：US20220375663A1

公开(公告)日：2022-11-24

申请号：US17764229

申请日：2020-09-29

申请人： THE UNIVERSITY OF TOKYO ,  DOWA HOLDINGS CO., LTD.

发明人： Shin-ichi OHKOSHI ,  Asuka NAMAl ,  Hiroko TOKORO ,  Marie YOSHIKIYO ,  Kazuhiro YAMAGA ,  Yasuto MIYAMOTO ,  Yuki MINEYAMA ,  Kenji SAKANE ,  Tetsuya KAWAHITO

IPC分类号： H01F1/11 ,  C01G49/06 ,  B82Y40/00 ,  B82Y30/00 ,  B82Y25/00

摘要： A raw material solution containing trivalent iron ions, or trivalent iron ions and ions of a metal element that partially substitutes Fe sites, and an alkaline aqueous solution for neutralizing the raw material solution are added to a reaction system to adjust the pH of the reaction system from 1.0 to 3.0 or lower. Hydroxycarboxylic acid is added to the obtained reaction solution and the pH of the reaction system is then neutralized from 7.0 to 10.0 or lower. The obtained precipitate of a substituent metal element-containing iron oxyhydroxide is coated with silicon oxide, followed by heating so as to form particles of ε-iron oxide in which Fe sites are partially substituted by other metal elements, and then, a slurry containing the particles is classified. The iron-based oxide magnetic powder has a particle shape close to a perfect sphere and is suitable for use in a magnetic recording medium.

公开(公告)号：US20160237331A1

公开(公告)日：2016-08-18

申请号：US15026290

申请日：2014-10-06

申请人： THE UNIVERSITY OF TOKYO

发明人： Shin-ichi OHKOSHI ,  Hiroko TOKORO ,  Marie YOSHIKIYO ,  Asuka NAMAI

IPC分类号： C09K5/06 ,  F28D20/02 ,  C01G23/04

CPC分类号： C09K5/063 ,  C01G23/04 ,  C01P2002/72 ,  C01P2002/76 ,  C01P2002/77 ,  C01P2006/32 ,  C01P2006/36 ,  C09K5/02 ,  F28D20/0034 ,  F28D20/02 ,  Y02E60/142

摘要： A heat storage/dissipation material has a constitution in which heat storage/dissipation titanium oxide made of Ti3O5 is dispersed in heat transfer oil in a liquid form, the heat storage/dissipation titanium oxide not undergoing phase transition into a β-phase that has properties of a non-magnetic semiconductor and maintaining a state of a paramagnetic metal as long as the heat storage/dissipation titanium oxide is not subjected to pressure or light for heat dissipation. The heat storage/dissipation material is capable of maintaining a state of storing heat as long as the heat storage/dissipation material is not subjected to the pressure or the light for heat dissipation and is capable of releasing heat when subjected to the pressure or the light for heat dissipation, and therefore is capable of releasing the stored heat at a desired timing.

摘要翻译： 储热耗散材料具有将由Ti 3 O 5构成的储热·散发氧化钛以液体形式分散在传热油中的结构，不会进入相转变为具有性质的β相的储热/ 的非磁性半导体，并且保持顺磁性金属的状态，只要蓄热/耗散氧化钛不经受用于散热的压力或光。 只要蓄热/散热材料不受到压力或散热的光的影响，散热材料就能够保持蓄热状态，并且当受到压力或光线时能够释放热量 用于散热，因此能够在期望的时间释放所存储的热量。

公开(公告)号：US20190035521A1

公开(公告)日：2019-01-31

申请号：US16070902

申请日：2017-01-19

申请人： THE UNIVERSITY OF TOKYO ,  DOWA ELECTRONICS MATERIALS CO., LTD.

发明人： Shin-ichi OHKOSHI ,  Hiroko TOKORO ,  Kenji MASADA ,  Toshihiko UEYAMA

IPC分类号： H01F1/11 ,  G03G9/083 ,  C01G49/06

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.

公开(公告)号：US20170349448A1

公开(公告)日：2017-12-07

申请号：US15544147

申请日：2016-01-18

申请人： THE UNIVERSITY OF TOKYO ,  DOWA ELECTRONICS MATERIALS CO., LTD.

发明人： Shin-ichi OHKOSHI ,  Hiroko TOKORO ,  Koji NAKABAYASHI ,  Asuka NAMAI ,  Kenta IMOTO ,  Kenji MASADA

IPC分类号： C01G49/02 ,  H01F1/11 ,  G11B5/706 ,  G11B5/845 ,  H05K9/00 ,  H01F1/113

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.

公开(公告)号：US20170137302A1

公开(公告)日：2017-05-18

申请号：US15318783

申请日：2015-06-18

申请人： THE UNIVERSITY OF TOKYO ,  DOWA ELECTRONICS MATERIALS CO., LTD.

发明人： Shin-ichi OHKOSHI ,  Marie YOSHIKIYO ,  Asuka NAMAI ,  Hiroko TOKORO ,  Waka TARORA ,  Tomomichi NASU ,  Takayuki YOSHIDA ,  Manabu TANAKA

IPC分类号： C01G49/06 ,  H01F1/11

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.