公开(公告)号：US11939663B2

公开(公告)日：2024-03-26

申请号：US18177244

申请日：2023-03-02

申请人： JX Metals Corporation

发明人： Manami Masuda ,  Masayoshi Shimizu ,  Yasuyuki Iwabuchi

IPC分类号： G11B5/706 ,  C04B35/01 ,  C22C19/07 ,  C23C14/08 ,  C23C14/14 ,  C23C14/34 ,  G11B5/65 ,  H01F1/10 ,  H01F41/18 ,  H01J37/34 ,  C22C1/04 ,  C22C32/00

CPC分类号： C23C14/3414 ,  C04B35/01 ,  C22C19/07 ,  C23C14/08 ,  C23C14/14 ,  G11B5/658 ,  G11B5/70605 ,  H01F1/10 ,  H01F41/18 ,  H01J37/3426 ,  C04B2235/405 ,  C04B2235/408 ,  C22C1/04 ,  C22C32/00

摘要： Provided is a sputtering target, the sputtering target containing 0.05 at % or more of Bi and having a total content of metal oxides of from 10 vol % to 60 vol %, the balance containing at least Co and Pt.

公开(公告)号：US11670332B2

公开(公告)日：2023-06-06

申请号：US17477087

申请日：2021-09-16

申请人： FUJIFILM Corporation

发明人： Norihito Kasada

IPC分类号： G11B5/702 ,  G11B5/706 ,  H01F1/08

CPC分类号： G11B5/70605 ,  H01F1/083 ,  G11B5/7021

摘要： The magnetic tape includes a non-magnetic support; a magnetic layer including ferromagnetic powder and a binding agent on one surface side of the non-magnetic support; and a back coating layer including non-magnetic powder and a binding agent on the other surface side of the non-magnetic support, in which an isoelectric point of a surface zeta potential of the magnetic layer is equal to or smaller than 3.8, and an isoelectric point of a surface zeta potential of the back coating layer is equal to or smaller than 3.0, a magnetic tape cartridge, and a magnetic tape apparatus including this magnetic tape.

公开(公告)号：US20170372738A1

公开(公告)日：2017-12-28

申请号：US15620916

申请日：2017-06-13

申请人： FUJIFILM Corporation

发明人： Norihito KASADA

IPC分类号： G11B5/706 ,  G11B5/735 ,  G11B5/627 ,  G11B5/84 ,  G11B5/008

CPC分类号： G11B5/70605 ,  G11B5/00813 ,  G11B5/627 ,  G11B5/7013 ,  G11B5/70678 ,  G11B5/7085 ,  G11B5/71 ,  G11B5/735 ,  G11B5/78 ,  G11B5/8404

摘要： Provided is a magnetic tape in which ferromagnetic powder included in a magnetic layer is ferromagnetic hexagonal ferrite powder having an activation volume equal to or smaller than 1,600 nm3, the magnetic layer includes one or more components selected from the group consisting of fatty acid and fatty acid amide, and an abrasive, a C—H derived C concentration calculated from a C—H peak area ratio of C1s spectra obtained by X-ray photoelectron spectroscopic analysis performed on the surface of the magnetic layer at a photoelectron take-off angle of 10 degrees is equal to or greater than 45 atom %, and a tilt cos θ of the ferromagnetic hexagonal ferrite powder with respect to the surface of the magnetic layer acquired by cross section observation performed by using a scanning transmission electron microscope is 0.85 to 1.00.

公开(公告)号：US20100062285A1

公开(公告)日：2010-03-11

申请号：US12554253

申请日：2009-09-04

申请人： Yasushi HATTORI

发明人： Yasushi HATTORI

IPC分类号： G11B5/62 ,  G11B5/84 ,  C23C14/34

CPC分类号： G11B5/70605 ,  B82Y25/00 ,  G11B5/714 ,  G11B5/851 ,  H01F10/3222

摘要： An aspect of the present invention relates to a magnetic recording medium comprising a magnetic layer on a nonmagnetic organic material support, wherein the magnetic layer comprises a magnetic material comprising a hard magnetic material comprising a rare earth element, and on a portion of a surface of the hard magnetic material, a soft magnetic region, and the soft magnetic region is exchange-coupled with the hard magnetic material. Another aspect of the present invention relates to a method of manufacturing a magnetic recording medium comprising forming a hard magnetic layer by coating a coating liquid comprising a hard magnetic material comprising a rare earth element on a nonmagnetic organic material support, and forming, on at least a portion of a surface of the hard magnetic material comprised in the hard magnetic layer, a soft magnetic region, the soft magnetic region being exchange-coupled with the hard magnetic material.

摘要翻译： 本发明的一个方面涉及一种在非磁性有机材料载体上包含磁性层的磁记录介质，其中该磁性层包括一种磁性材料，该磁性材料包括一种含有稀土元素的硬磁材料，并且在一部分表面上 硬磁性材料，软磁性区域和软磁性区域与硬磁性材料交换耦合。 本发明的另一方面涉及一种制造磁记录介质的方法，包括通过在非磁性有机材料载体上涂覆包括稀土元素的硬磁性材料的涂布液，形成硬磁性层，并至少形成 包含在硬磁性层中的硬磁性材料表面的一部分，软磁区域，软磁区域与硬磁性材料交换耦合。

公开(公告)号：US07381239B2

公开(公告)日：2008-06-03

申请号：US10875772

申请日：2004-06-25

申请人： Koukichi Waki ,  Genichi Furusawa ,  Yasushi Hattori

发明人： Koukichi Waki ,  Genichi Furusawa ,  Yasushi Hattori

IPC分类号： H01F1/20

CPC分类号： B82Y30/00 ,  B22F1/0018 ,  B22F9/24 ,  B22F2998/10 ,  B22F2999/00 ,  G11B5/70605 ,  G11B5/714 ,  Y10S977/777 ,  B22F1/0003 ,  B22F1/0085 ,  B22F1/0014 ,  C22C1/0491

摘要： Disclosed are alloy nano-particles having a fluctuation coefficient of particle size of 20% or less and a fluctuation coefficient of composition of 20% or less. The alloy nano-particles have a low transformation point and hardly aggregate and which can form a flat magnetic film having high coercive force.

摘要翻译： 公开了具有20％以下的粒径的波动系数和组成的波动系数在20％以下的合金纳米粒子。 合金纳米粒子具有低的相变点，几乎不会聚集，并且可以形成具有高矫顽力的平面磁性膜。

公开(公告)号：US20070259133A1

公开(公告)日：2007-11-08

申请号：US11793029

申请日：2005-12-07

申请人： Teruo Ono ,  Shinpei Yamamoto ,  Yasumasa Morimoto ,  Mikio Takano

发明人： Teruo Ono ,  Shinpei Yamamoto ,  Yasumasa Morimoto ,  Mikio Takano

IPC分类号： B29C35/08 ,  B05D3/00

CPC分类号： H01F1/068 ,  B22F1/0018 ,  B22F2998/00 ,  B22F2998/10 ,  B82Y25/00 ,  B82Y30/00 ,  G11B5/70605 ,  G11B5/712 ,  H01F1/0054 ,  H01F1/09 ,  H01F41/0273 ,  B22F1/02 ,  B22F9/24 ,  B22F9/305 ,  B22F1/0085

摘要： A FePt alloy nanoparticle, which is expected to be a promising material used for an ultra-high-density magnetic recording medium of the next generation, is ordered by heat treatment to have high magnetic anisotropy, but there has been a problem that the particles are coalesced with each other and agglomerate during the heat treatment. According to the present invention, each particle of the alloy nanoparticles is covered with a coating such as SiO2, and thereafter a heat treatment for ordering is carried out. In this method, the alloy nanoparticles do not coalesce with each other even if the heat treatment is performed at such a high temperature as to allow all the particles to be fully ordered. After the heat treatment, only the coating is removed using an acid or alkali solution so that it is possible to obtain ordered alloy phase nanoparticles which are ordered and dispersible in various solutions. It is also possible to easily manufacture an ultra-high-density magnetic recording medium by coating surfaces of a substrate with a binder solution in which the particles are dispersed while applying a magnetic field in a predetermined direction.

摘要翻译： 预期是用于下一代超高密度磁记录介质的有希望的材料的FePt合金纳米颗粒通过热处理进行排序以具有高磁各向异性，但是存在颗粒为 在热处理期间彼此聚结并聚结。 根据本发明，用SiO 2等涂层覆盖合金纳米颗粒的每个颗粒，然后进行排序热处理。 在这种方法中，即使在如此高的温度下进行热处理以使全部颗粒被完全排序，合金纳米颗粒也不会彼此聚结。 在热处理之后，仅使用酸或碱溶液除去涂层，使得可以获得排列在各种溶液中的有序合金相纳米颗粒。 还可以通过在其中分散颗粒的粘合剂溶液涂覆基板的表面，同时沿预定方向施加磁场来容易地制造超高密度磁记录介质。

公开(公告)号：US07244287B2

公开(公告)日：2007-07-17

申请号：US10895938

申请日：2004-07-22

申请人： Yasushi Hattori ,  Koukichi Waki ,  Keizo Ogawa

发明人： Yasushi Hattori ,  Koukichi Waki ,  Keizo Ogawa

IPC分类号： C22B1/16

CPC分类号： B82Y25/00 ,  G11B5/70605 ,  H01F1/0054 ,  H01F10/123 ,  Y10T428/12465 ,  Y10T428/12875 ,  Y10T428/12882 ,  Y10T428/12931 ,  Y10T428/294 ,  Y10T428/2982

摘要： The present invention relates to a method of producing a magnetic particle including forming a layer containing an alloy particle that can form a CuAu-type or Cu3Au-type hard magnetic ordered alloy phase on a support, oxidizing the layer, and annealing the layer in a non-oxidizing atmosphere. The invention also relates to a method of producing a magnetic particle including producing an alloy particle that can form a hard magnetic ordered alloy phase, oxidizing the alloy particle, and annealing the particle in a non-oxidizing atmosphere, and a magnetic particle produced by the foregoing production method. Further, the invention relates to a magnetic recording medium comprising a magnetic layer containing a magnetic particle and a method of producing a magnetic recording medium including forming a layer containing an alloy that can form the foregoing hard magnetic ordered alloy phase, oxidizing the layer, and annealing the layer in a non-oxidizing atmosphere.

摘要翻译： 本发明涉及一种磁性粒子的制造方法，其特征在于，包括形成含有合金粒子的层，所述合金粒子能够在载体上形成CuAu型或Cu 3 Au型硬磁性有序合金相，氧化 并在非氧化性气氛中退火该层。 本发明还涉及一种制造磁性颗粒的方法，包括制造能够形成硬磁性有序合金相的合金颗粒，氧化合金颗粒和在非氧化性气氛中退火颗粒，以及由 以前的生产方法。 此外，本发明涉及包含含有磁性颗粒的磁性层的磁记录介质和包括形成含有可形成上述硬磁性有序合金相的合金的层的氧化层的磁记录介质的方法，以及 在非氧化性气氛中退火该层。

公开(公告)号：US07029773B2

公开(公告)日：2006-04-18

申请号：US10683383

申请日：2003-10-10

申请人： René J. M. van de Veerdonk ,  Xiaowei Wu ,  Dieter K. Weller

发明人： René J. M. van de Veerdonk ,  Xiaowei Wu ,  Dieter K. Weller

IPC分类号： G11B5/64

CPC分类号： B82Y25/00 ,  B82Y10/00 ,  G11B5/00 ,  G11B5/012 ,  G11B5/02 ,  G11B5/09 ,  G11B5/127 ,  G11B5/17 ,  G11B5/33 ,  G11B5/70605 ,  G11B5/712 ,  G11B5/714 ,  G11B5/74 ,  G11B5/743 ,  G11B5/82 ,  G11B11/002 ,  G11B11/03 ,  G11B2005/0002 ,  G11B2005/0005 ,  G11B2005/0021 ,  H01F1/0054 ,  H01F1/009 ,  H01F1/068 ,  Y10T428/24942 ,  Y10T428/25 ,  Y10T428/2991 ,  Y10T428/2995 ,  Y10T428/2998

摘要： A method and system for magnetic recording using self-organized magnetic nanoparticles is disclosed. The method may include depositing surfactant coated nanoparticles on a substrate, wherein the surfactant coated nanoparticles represent first bits of recorded information. The surfactant coating is then removed from selected of the surfactant coated nanoparticles. The selected nanoparticles with their surfactant coating removed may then be designated to represent second bits of recorded information. The surfactant coated nanoparticles have a first saturation magnetic moment and the selected nanoparticles with the surfactant coating removed have a second saturation magnetic moment. Therefore, by selectively removing the surfactant coating from certain nanoparticles, a write operation for recording the first and second bits of information may be performed. A read operation may be carried out by detecting the different magnetic moments of the surfactant coated nanoparticles and the non-surfactant coated nanoparticles.

公开(公告)号：US20050214593A1

公开(公告)日：2005-09-29

申请号：US11088916

申请日：2005-03-25

申请人： Hiroaki Dousita

发明人： Hiroaki Dousita

IPC分类号： G11B5/714 ,  B32B1/00 ,  C08J7/04 ,  G11B5/70 ,  G11B5/706 ,  G11B5/712 ,  G11B5/738

CPC分类号： C08J7/045 ,  G11B5/70 ,  G11B5/70605 ,  G11B5/712 ,  G11B5/714

摘要： A magnetic recording medium comprising a non-magnetic support and a magnetic layer containing a ferromagnetic metal powder and a binder, wherein the ferromagnetic metal powder comprises an oxide layer and a metal portion surrounded by the oxide layer, and the ferromagnetic metal powder has an average long axis length of from 30 nm to 55 nm, a coefficient of variation of long axis length of not more than 25%, a coefficient of variation of axial ratio of not more than 20%, and a coefficient of variation of a thickness of the oxide layer of not more than 15%.

摘要翻译： 一种包含非磁性载体和含有铁磁性金属粉末和粘合剂的磁性层的磁记录介质，其中所述强磁性金属粉末包括氧化物层和被所述氧化物层包围的金属部分，并且所述强磁性金属粉末具有平均值 长轴长度为30nm〜55nm，长轴长度变化系数不大于25％，轴比变化系数不超过20％，厚度变化系数为 氧化层不超过15％。

公开(公告)号：US20050204865A1

公开(公告)日：2005-09-22

申请号：US11006569

申请日：2004-12-08

申请人： Hiroyuki Hirai ,  Koukichi Waki

发明人： Hiroyuki Hirai ,  Koukichi Waki

IPC分类号： G11B5/706 ,  G11B5/714 ,  G11B5/84 ,  H01F1/00 ,  H01F1/06 ,  H01F1/44

CPC分类号： B82Y25/00 ,  G11B5/70605 ,  H01F1/0054 ,  H01F1/047 ,  H01F1/068 ,  H01F1/44

摘要： Disclosed is a method for extracting magnetically hard alloy nanoparticles, which comprises preparing a magnetic alloy nanoparticle dispersion by heating an organometallic compound containing a metal constituting a magnetically hard ordered alloy with a polyol compound having a boiling point of 150 to 350° C. and extracting magnetically hard alloy nanoparticles from the dispersion into a hydrophobic organic solvent in the presence of a hydrophobic surface modifying agent. The method can provide magnetically hard alloy nanoparticles showing almost no particle aggregation and markedly reduced load for drying.

摘要翻译： 公开了一种用于提取磁性硬质合金纳米颗粒的方法，其包括通过将含有构成磁性有序合金的金属的有机金属化合物与沸点为150-350℃的多元醇化合物加热制备磁性合金纳米颗粒分散体，并提取 磁性硬质合金纳米粒子在疏水表面改性剂存在下从分散体中分散成疏水性有机溶剂。 该方法可以提供几乎不显示颗粒聚集的磁性硬质合金纳米颗粒，并显着降低干燥负载。