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    Magnetic materials comprising spin-coupled hard and soft magnetic phases
    41.
    发明专利
    Magnetic materials comprising spin-coupled hard and soft magnetic phases 未知

    公开(公告)号：DE4141763A1

    公开(公告)日：1993-06-24

    申请号：DE4141763

    申请日：1991-12-18

    Applicant: BASF AG

    Inventor： RICHTER HANS JUERGEN DR ,  SCHWAB EKKEHARD DR ,  JAKUSCH HELMUT DR ,  HIBST HARTMUT DR ,  GRAU WERNER DR ,  KNELLER ECKART PROF DR ,  HAWIG REINHARD

    IPC: G11B5/706 ,  H01F1/03 ,  H01F1/057 ,  H01Q17/00 ,  H02K1/02

    Abstract: A magnetisable material consists of at least two ferro- and/or ferrimagnetic phases which are magnetically coupled to each other by magnetic exchange coupling. At least one of the phases is a hard magnetic phase and at least one of the phases is a soft magnetic phase. The vol. percentage of the soft magnetic phase is at least 30%. At least 65% of the original saturation remanence is obtd. again after prior magnetic saturation in a direction corresp. to the application of an opposite magnetic field which is the same as the coercive field strength of the magnetic material, and after removing the field. The saturation remanence is at least 50% of the saturation magnetisation. The material is mfd. by spraying a melt of rare earth metals, Fe, B, a transition metal and Si on to a rotating metal roll in an inert atmos., and annealing the flakes produced at 670-780 deg.C to give the desired ratio of hard- to soft magnetic phases. Pref. an alloy of compsn. RExFeyBzSiuTv is used as the magnetic material, where RE is one or more rare earth metals and/or Y, Zr and Hf, and T is one or more transition metal with a body-centred cubic structure, and where x is not greater than 10 atom %, y is not greater than 85 atom %, z is not greater than 25 atom %, u is not greater than 10 atom %, and v is not greater than 10 atom %. Up to 10 atom % Fe may be replaced by Ni and/or Co. The soft magnetic phases comprises alpha-Fe and Fe3B, and the hard magnetic phase comprises Nd2Fe14B.

    PROCESS FOR PRODUCING MAGNETIC-RECORDING SUPPORTS
    43.
    发明专利
    PROCESS FOR PRODUCING MAGNETIC-RECORDING SUPPORTS 未知

    公开(公告)号：DE3573345D1

    公开(公告)日：1989-11-02

    申请号：DE3573345

    申请日：1985-07-10

    Applicant: BASF AG

    Inventor： MELZER MILENA ,  SCHNEIDER NORBERT ,  JAKUSCH HELMUT DR ,  BALZ WERNER DR

    IPC: G11B5/702 ,  C09D5/23 ,  C09D175/06 ,  G11B5/70 ,  G11B5/842

    Abstract: Magnetic recording media are produced by preparing a dispersion consisting of finely divided magnetic material, a dispersant, the conventional additives and a solution or a dispersion of a polymeric binder, applying the dispersion in the form of a layer onto a non-magnetizable base, orienting the anisotropic magnetic material by means of a magnetic field and drying the applied layer, by a process in which the dispersant employed is obtained by reacting A. from 70 to 95 parts by weight of a reaction product of I. from 0.5 to 1.5 moles of an oxoalcohol of 6 to 20 carbon atoms, II. from 6 to 18 moles of ethylene oxide and III. from 2 to 10 moles of propylene oxide, with B. from 5 to 30 parts by weight of a polyphosphoric acid having a P2O5 content of from 80 to 88%.

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