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    IRON NITRIDE-BASED MAGNETIC POWDER, PROCESS FOR PRODUCING THE SAME, AND MAGNETIC RECORDING MEDIUM
    61.
    发明公开
    IRON NITRIDE-BASED MAGNETIC POWDER, PROCESS FOR PRODUCING THE SAME, AND MAGNETIC RECORDING MEDIUM 有权
    AUF EISENNITRID BASIERENDES MAGNETPULVER，HERSTELLUNGSPROZESSDAFÜRUND MAGNETISCHES AUFZEICHNUNGSMEDIUM

    公开(公告)号：EP2031607A1

    公开(公告)日：2009-03-04

    申请号：EP07745321.5

    申请日：2007-06-08

    申请人： DOWA Electronics Materials Co., Ltd.

    发明人： ISHIKAWA, Yuzo ,  MASADA, Kenji

    IPC分类号： H01F1/09 ,  B22F1/00 ,  C01B21/06 ,  G11B5/712 ,  G11B5/714 ,  H01F1/06

    CPC分类号： G11B5/70626 ,  B82Y30/00 ,  C01B21/0622 ,  C01P2004/64 ,  C01P2004/80 ,  C01P2006/42 ,  G11B5/712 ,  G11B5/714 ,  H01F1/065 ,  H01F1/09

    摘要： Provided is an iron nitride-based magnetic powder that comprises magnetic particles having a mean particle size of at most 20 nm. The magnetic particle has a core of a main phase of Fe 16 N 2 and has, on the outer side of the core, an oxide phase derived from a metal Fe phase formed by reduction of iron nitride. In relation to the weatherability index Δσs and the saturation magnetization σs thereof, the magnetic powder satisfies Δσs ≤ 0.8 x σs - 30. In this, Δσs = (σs - σs 1 )/σs x 100. σs 1 means the saturation magnetization of the magnetic powder kept in an atmosphere of 60°C and 90 % RH for 1 week. The powder can be obtained by exposing powder particles having a main phase of Fe 16 N 2 to a reducing gas to partly reduce the region of the surface of the particles into a metal Fe phase (gradual reduction) followed by exposing them to an oxidizing gas to oxidize a part of the surface of the metal Fe phase into an oxide phase (gradual oxidation).

    摘要翻译： 本发明提供一种含有平均粒径为20nm以下的磁性粒子的氮化铁系磁性粉末。 该磁性颗粒具有Fe 16 N 2主相的芯，并且在芯的外侧具有衍生自通过还原氮化铁形成的金属Fe相的氧化物相。 关于耐候性指数“Ãs和饱和磁化强度”，磁粉满足“ɤ0.8 xâ30”。在这里，“Ãs=（Ãs - Ãs1）/Ãsx 100.Ãs1表示 磁粉的饱和磁化强度保持在60℃，90％RH的气氛中1周。 可以通过将具有Fe 16 N 2主相的粉末颗粒暴露于还原气体来部分地将颗粒表面的区域还原为金属Fe相（逐渐还原），然后将其暴露于氧化气体 以将金属Fe相的一部分表面氧化成氧化物相（逐渐氧化）。

    Magnetic powder suitable for low-noise media
    66.
    发明公开
    Magnetic powder suitable for low-noise media 审中-公开
    Magnetisches Pulver geeignetfürgeräuscharmeMedien

    公开(公告)号：EP1748450A1

    公开(公告)日：2007-01-31

    申请号：EP06015404.4

    申请日：2006-07-24

    申请人： Dowa Mining Co., Ltd.

    发明人： Masada, Kenji ,  Ishikawa, Yuzo ,  Kimura, Hiroshi

    IPC分类号： H01F1/06 ,  G11B5/706

    CPC分类号： H01F1/065 ,  G11B5/70615 ,  G11B5/70626 ,  G11B5/714

    摘要： An iron system magnetic powder, and particularly an iron system magnetic powder comprised chiefly of Fe 16 N 2 , is provided that has an atomic ratio of total noble metal content to Fe of 0.01 - 10%. The magnetic powder can be produced by subjecting iron oxy-hydroxide or iron oxide having an atomic ratio of total noble metal content to Fe of 0.01 - 10% to reduction treatment. The average particle volume of the magnetic powder is preferably 4,000 nm 3 or less. The magnetic powder is suitable for fabricating high recording density media of low noise, high output and high C/N ratio that are suitable for use with a GMR head or the like.

    摘要翻译： 提供铁系磁铁粉末，特别是主要由Fe 16 N 2构成的铁系磁铁粉末，其具有的总贵金属含量与Fe的原子比为0.01〜10％。 磁性粉末可以通过使具有0.01-10％的总贵金属含量的原子比的氧化铁氧化物或氧化铁进行还原处理来制备。 磁粉的平均粒子体积优选为4000nm 3以下。 该磁粉适用于制造适用于GMR头等的低噪音，高输出和高C / N比的高记录密度介质。

    AGGREGATE OF MAGNETIC ALLOY PARTICLE
    67.
    发明公开
    AGGREGATE OF MAGNETIC ALLOY PARTICLE 有权
    磁性合金颗粒的聚集体

    公开(公告)号：EP1661646A1

    公开(公告)日：2006-05-31

    申请号：EP04771322.7

    申请日：2004-07-30

    申请人： Dowa Mining Co., Ltd.

    发明人： SATO, Kimitaka, Dowa Mining Co., Ltd.

    IPC分类号： B22F1/00 ,  B22F1/02 ,  C22C38/00 ,  G11B5/706 ,  G11B5/70 ,  G11B5/714

    CPC分类号： B22F1/0022 ,  B22F9/24 ,  B22F2998/00 ,  B82Y25/00 ,  B82Y30/00 ,  C22C1/0491 ,  H01F1/0054 ,  H01F1/065 ,  H01F1/068 ,  H01F10/007 ,  Y10T428/12014 ,  Y10T428/12181 ,  Y10T428/12993

    摘要： Assemblages of particles of a magnetic alloy that are suited to magnetic recording are represented by the formula [ T X M 1- X ] containing T and M in a composition ratio where X in the formula is in the range from 0.3 or greater to 0.7 or less, where T is one or two members of the group consisting of Fe and Co and M is one or two members of the group consisting of Pt and Pd, and metallic elements other than T and M that constitute no more than 30 at.% (including 0 at.%) of ( T + M ) as a percentage of atoms, and the remainder consists of impurities that are unavoidable from a production standpoint, wherein: the face-centered tetragonal fraction is 10-100%, the average grain size as measured by TEM observation ( D TEM ) is in the range from 5-30 nm, the x-ray crystal grain size derived by x-ray diffraction ( D X ) is no less than 4 nm, the particles of are dispersed from each other at a distance, and the dispersion on the composition of the individual particles is kept within a stipulated range.

    摘要翻译： 适于磁记录的磁性合金颗粒的组合物由包含T和M的式[TXM1-X]表示，其组成比例中的X在0.3以上至0.7以下的范围内，其中 T是由Fe和Co组成的组中的一个或两个成员，并且M是由Pt和Pd组成的组中的一个或两个成员，以及除T和M以外的构成不超过30原子％（包括0 （T + M）的原子百分数（％）），剩余部分由从生产观点来看不可避免的杂质组成，其中：面心正方晶系分数为10-100％，测得的平均晶粒尺寸 通过TEM观察（DTEM）测定的范围为5-30nm，通过X射线衍射（DX）得到的X射线晶体粒径不小于4nm，粒子彼此分散一定距离 并且将各个颗粒的组成分散保持在规定的范围内。