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    Method of producing ferromagnetic metal powder
    1.
    发明授权
    Method of producing ferromagnetic metal powder 失效
    制造铁磁性金属粉末的方法

    公开(公告)号：US4262037A

    公开(公告)日：1981-04-14

    申请号：US783648

    申请日：1977-04-01

    申请人： Seiichi Asada ,  Masahiro Amemiya

    发明人： Seiichi Asada ,  Masahiro Amemiya

    IPC分类号： C21B15/00 ,  B22F9/22 ,  H01F1/06 ,  B05D5/12

    CPC分类号： H01F1/065

    摘要： A method of producing ferromagnetic metal powder comprises the steps of dipping an iron compound powder in a solution in which an aluminum compound and/or a titanium compound is dissolved, removing solvent from the iron compound powder, reducing the iron compound powder in a reducing atmosphere at an elevated temperature and forming oxide layers on whole surfaces of the individual particles of the iron powder. Ferromagnetic iron powder produced according to this method has both a high coercive force and a high remanence ratio.

    摘要翻译： 制造铁磁性金属粉末的方法包括将铁化合物粉末浸渍在其中溶解有铝化合物和/或钛化合物的溶液中的步骤，从铁化合物粉末中除去溶剂，在还原气氛中还原铁化合物粉末 在高温下，在铁粉的各个颗粒的整个表面上形成氧化物层。 根据该方法制造的铁磁性铁粉具有高的矫顽力和高的剩磁比。

    Method of producing ferromagnetic metal powder by gaseous reduction of silicon compound-coated raw material
    2.
    发明授权
    Method of producing ferromagnetic metal powder by gaseous reduction of silicon compound-coated raw material 失效
    通过硅化合物涂覆的原料的气态还原生产铁磁性金属粉末的方法

    公开(公告)号：US4043846A

    公开(公告)日：1977-08-23

    申请号：US667549

    申请日：1976-03-17

    申请人： Masahiro Amemiya ,  Seiichi Asada

    发明人： Masahiro Amemiya ,  Seiichi Asada

    IPC分类号： B22F9/22 ,  H01F1/06 ,  H01F1/02 ,  B22F3/00 ,  C22C1/04

    CPC分类号： B22F9/22 ,  H01F1/065

    摘要： A method of producing ferromagnetic iron powder comprises the steps of dipping iron compound powder in a solution in which silicone oil is dissolved, removing solvent from the iron compound powder, reducing the iron compound powder in a reducing atmosphere at an elevated temperature and forming oxide layers on whole surfaces of the individual particles of the iron compound powder. Ferromagnetic iron powder produced according to this method has both a high coercive force and a high remanence ratio.

    摘要翻译： 制备铁磁性铁粉的方法包括以下步骤：将铁化合物粉末溶解在其中溶解有硅油的溶液中，从铁化合物粉末中除去溶剂，在升高的温度下还原还原气氛中的铁化合物粉末并形成氧化物层 在铁化合物粉末的各个颗粒的整个表面上。 根据该方法制造的铁磁性铁粉具有高的矫顽力和高的剩磁比。

    Perpendicular magnetic recording medium and fabrication method therefor
    5.
    发明授权
    Perpendicular magnetic recording medium and fabrication method therefor 失效
    垂直磁记录介质及其制造方法

    公开(公告)号：US4743491A

    公开(公告)日：1988-05-10

    申请号：US793772

    申请日：1985-11-01

    申请人： Seiichi Asada ,  Hiroyuki Suzuki ,  Toshio Niihara ,  Kazuetsu Yoshida ,  Masaaki Futamoto ,  Yukio Honda ,  Norikazu Tsumita ,  Kazuo Shiiki

    发明人： Seiichi Asada ,  Hiroyuki Suzuki ,  Toshio Niihara ,  Kazuetsu Yoshida ,  Masaaki Futamoto ,  Yukio Honda ,  Norikazu Tsumita ,  Kazuo Shiiki

    IPC分类号： G11B5/66 ,  G11B5/73 ,  G11B7/24

    CPC分类号： G11B5/7325 ,  G11B5/66 ,  Y10S428/90 ,  Y10T428/2495 ,  Y10T428/265 ,  Y10T428/31678

    摘要： A perpendicular magnetic recording medium according to this invention comprises an electrically conductive underlayer formed on a non-magnetic substrate, in the case where no high permeability magnetic film is deposited, and a magnetic thin film having a perpendicular magnetic anisotrophy is formed thereon. In the case of a so-called double-layer structure including a high permeablilty magnetic film, on the non-magnetic substrate are formed the high permeablilty magnetic film, an intermediate film, and a magnetic thin film one on another in this order. The nearest neighbor's distance of atoms of the underlayer and the intermediate film is not smaller than 0.25 nm (2.5 .ANG.) and not greater than 0.32 nm (3.2 .ANG.) and they are made of at least one selected from the group consisting of V, Ru, Zn, Os, Rh, Ir, Mo, W, Re, Pd, Pt, Nb, Ta, Sn, Al, Au, Ag, Ti, nitrides and oxides of these elements.

    摘要翻译： 根据本发明的垂直磁记录介质包括形成在非磁性基板上的导电底层，在没有沉积高磁导率磁性膜的情况下，并且在其上形成具有垂直磁性各向异性的磁性薄膜。 在包括高透度磁性膜的所谓双层结构的情况下，在非磁性基板上依次形成高磁导率磁性膜，中间膜和磁性薄膜。 最邻近的底层原子与中间膜的距离不小于0.25nm（2.5），不大于0.32nm（3.2），它们由选自V，Ru ，Zn，Os，Rh，Ir，Mo，W，Re，Pd，Pt，Nb，Ta，Sn，Al，Au，Ag，Ti，氮化物和这些元素的氧化物。