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    Magnetic materials with exchange anisotropy and process for their manufacture
    1.
    发明授权
    Magnetic materials with exchange anisotropy and process for their manufacture 失效
    具有交换各向异性的磁性材料及其制造方法

    公开(公告)号：US3959032A

    公开(公告)日：1976-05-25

    申请号：US535577

    申请日：1974-12-23

    申请人： Eberhard Koester ,  Gerd Wunsch ,  Paul Deigner ,  Dieter Graw ,  Karl Uhl ,  Werner Steck

    发明人： Eberhard Koester ,  Gerd Wunsch ,  Paul Deigner ,  Dieter Graw ,  Karl Uhl ,  Werner Steck

    IPC分类号： G11B5/62 ,  C09D5/23 ,  C09D7/12 ,  G11B5/706 ,  H01F1/06 ,  H01F1/09 ,  H01F1/33

    CPC分类号： H01F1/09 ,  G11B5/70621 ,  H01F1/0009

    摘要： Magnetic materials which essentially consist of a phase A with a ferromagnetic spin system and a phase B with an anti-ferromagnetic spin system, phases A and B interacting by exchange coupling, and the manufacture of such materials. The materials consist essentially of two-phase magnetic single-domain particles, with the alloy [Co.sub.x Ni.sub.1.sub.-x ] as the ferromagnetic phase A and its oxidized form [(CoO).sub.x (NiO).sub.1.sub.-x ] as the anti-ferromagnetic phase B, with values of x of 0.04 to 0.96. They are manufactured by surface oxidation of a pigment layer, which at least covers the surface but may extend deeper, having the composition of phase A, to form an oxide layer, at least 40 A thick, of the phase B, followed by heating in an inert gas atmosphere, or by reduction of a corresponding layer of phase B to a layer of phase A. Magnetic single-domain particles of this composition have a Neel temperature which varies with X. As a result, materials are obtained which have an asymmetrical hysteresis loop, attributable to exchange anisotropy, at temperatures which can be varied within wide limits in accordance with the intended use of the material.

    摘要翻译： 磁性材料基本上由具有铁磁自旋系统的相A和具有反铁磁旋转系统的相B组成，A相和B相通过交换耦合相互作用，并且制造这种材料。 这些材料基本上由两相磁性单畴粒子组成，合金[CoxNi1-x]作为铁磁相A，其氧化形式[（CoO）x（NiO）1-x]作为反铁磁相B ，值x为0.04至0.96。 它们通过颜料层的表面氧化制造，颜料层至少覆盖表面但可以延伸得更深，具有相A的组成，以形成相B的至少40μA的氧化物层，随后加热 惰性气体气氛，或通过将相B的相应层减少到相A层。该组合物的磁性单畴颗粒具有随X变化的Neel温度。结果，获得具有不对称性的材料 可归因于交换各向异性的磁滞回线，其温度可以根据材料的预期用途在宽范围内变化。

    Device for magnetically orienting the magnetizable particles or magnetic recording media in a preferred direction
    5.
    发明授权
    Device for magnetically orienting the magnetizable particles or magnetic recording media in a preferred direction 失效
    用于在优选方向上磁化定向可磁化颗粒或磁记录介质的装置

    公开(公告)号：US4382244A

    公开(公告)日：1983-05-03

    申请号：US242560

    申请日：1981-03-11

    申请人： Eberhard Koester ,  Paul Deigner ,  Dieter Schaefer ,  Karl Uhl ,  Roland Falk

    发明人： Eberhard Koester ,  Paul Deigner ,  Dieter Schaefer ,  Karl Uhl ,  Roland Falk

    IPC分类号： G11B5/845 ,  H01F7/20

    CPC分类号： G11B5/845

    摘要： A device for magnetically orienting the magnetizable particles of magnetic recording media in a preferred direction, which media are obtained by applying a coating of anisotropically magnetic particles finely dispersed in a solution of an organic binder system and conventional additives to a non-magnetic base, and subsequently solidifying the coating, by the action, on the still fluid coating, of the magnetic fields produced by two E-shaped electromagnets arranged symmetrically with respect to, and in mirror-image relationship to, the plane of the said coating.

    摘要翻译： 一种用于沿优选方向磁性取向磁记录介质的可磁化颗粒的装置，所述介质通过将微分散在有机粘合剂体系和常规添加剂的溶液中的各向异性磁性颗粒的涂层施加到非磁性基底而获得，以及 随后通过对所述涂层的平面相对于所述涂层的平面和镜像关系对称地布置的两个E形电磁体产生的磁场，在静止流体涂层上固化涂层。

    Device for the non-destructive measurement of the remanent flux density of magnetic recording media, especially magnetic discs
    6.
    发明授权
    Device for the non-destructive measurement of the remanent flux density of magnetic recording media, especially magnetic discs 失效
    用于无损测量磁记录介质，特别是磁盘的剩磁通密度的装置

    公开(公告)号：US3984763A

    公开(公告)日：1976-10-05

    申请号：US618041

    申请日：1975-09-30

    申请人： Eberhard Koester ,  Paul Deigner ,  Roland Falk ,  Georg Huber ,  Karl Uhl

    发明人： Eberhard Koester ,  Paul Deigner ,  Roland Falk ,  Georg Huber ,  Karl Uhl

    IPC分类号： G01R33/12 ,  G11B5/00 ,  G11B5/84

    CPC分类号： G01R33/1207

    摘要： The invention concerns a device for the non-destructive measurement of the remanent flux density of magnetic recording media, by recording a specific signal and reproducing the recorded signal by means of two pairs of magnetic recording and playback heads arranged opposite one another and perpendicular to the plane of the recording medium, the ratio of the distance between the individual magnetic heads of each pair of heads to the wavelength of the recorded signal being within a specific range, and the said distance being such that a magnetic recording medium is movable symmetrically between the pair of heads, a common measuring unit being associated with the playback pair. Further features of the device relate to the design of the magnetic recording and playback heads, the measuring unit and the rate at which the particular magnetic recording medium being tested moves between the pairs of heads.

    摘要翻译： 本发明涉及用于通过记录特定信号和通过两对磁记录和重放头相互重叠并垂直于磁记录介质的磁记录和重放头对磁记录介质的剩余通量密度进行非破坏性测量的装置。 记录介质的平面，每对磁头的各个磁头与记录信号的波长之间的距离的比例在特定范围内，并且所述距离使得磁记录介质在 一对头，与播放对相关联的公共测量单元。 该装置的其他特征涉及磁记录和重放头，测量单元的设计以及被测试的特定磁记录介质在两对磁头之间移动的速率。

    Device for the magnetic orientation of magnetic recording media
    7.
    发明授权
    Device for the magnetic orientation of magnetic recording media 失效
    磁记录介质的磁性定向装置

    公开(公告)号：US4003336A

    公开(公告)日：1977-01-18

    申请号：US604129

    申请日：1975-08-13

    申请人： Eberhard Koester ,  Paul Deigner ,  Roland Falk ,  Karl Uhl ,  Dieter Schaefer

    发明人： Eberhard Koester ,  Paul Deigner ,  Roland Falk ,  Karl Uhl ,  Dieter Schaefer

    IPC分类号： G11B5/845 ,  B05C11/00

    CPC分类号： G11B5/845

    摘要： A device for manufacturing magnetic recording media in which the magnetic particles in the recording layer are oriented in a preferred direction, the fluid coating applied to the base being subjected to the action of a magnetic field produced in the air gaps between the spaced apart poles of two magnetic circuits, one on each side of the coated face, arranged symmetrically with respect to the plane of the coated base, the edges of the poles adjacent to the coated base terminating in screening elements shaped in such a way that the distance between the surfaces of the screening elements facing the coated base and the coated base itself increases as the screening elements extend away from the edges of the poles. A high degree of magnetic anisotropy in the recording layer can also be obtained when the magnetic circuits are at a relatively large distance from the still fluid magnetic coating.

    摘要翻译： 一种用于制造磁记录介质的装置，其中记录层中的磁性颗粒沿优选方向取向，施加到基底的流体涂层受到在间隔开的极间的空隙中产生的磁场的作用 相对于被涂覆的基体的平面对称地布置有两个磁路，一个在涂覆面的每一侧上，与被涂覆的基底相邻的极点的边缘终止于以这样的方式成形的屏蔽元件： 面向涂覆的基底的筛选元件和涂覆的基底本身随着筛分元件远离极的边缘而增加。 当磁路距离静止流体磁性涂层相对较大的距离时，也可以获得记录层中的高度的磁各向异性。