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    Magnetic materials comprising spin-coupled hard and soft magnetic phases
    32.
    发明专利
    Magnetic materials comprising spin-coupled hard and soft magnetic phases 未知

    公开(公告)号：DE4120663A1

    公开(公告)日：1992-12-24

    申请号：DE4120663

    申请日：1991-06-22

    Applicant: BASF AG

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

    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.

    Optical storage medium with reversible phase transitions - comprising tellurium-arsenic-germanium amorphous-crystalline layer on glass substrate
    35.
    发明专利
    Optical storage medium with reversible phase transitions - comprising tellurium-arsenic-germanium amorphous-crystalline layer on glass substrate 未知

    公开(公告)号：DE4030510A1

    公开(公告)日：1992-04-02

    申请号：DE4030510

    申请日：1990-09-27

    Applicant: BASF AG

    Inventor： ISELBORN STEFAN DR ,  HIBST HARTMUT DR

    IPC: G11B7/0055 ,  G11B7/24

    Abstract: A reversible, optical recording medium is disclosed, with at least one substrate and at least one Te-As-Ge contg. storage layer of the phase transition type. The storage layer is formed from a Te-As-Ge alloy with a Ge content between 8 and 24 atomic % and an As content between 19 and 39 atomic %. A dielectric layer is deposited on at least one side of the storage layer. A reflection layer is deposited between the storage/dielectric layer system and the substrate, or on the side of the substrate opposite the layer system. The layers are formed by sputtering or evapn. ADVANTAGE - The device is highly sensitive, can be written to at temps. below 600 deg.C and erased in less than 300 ns. It has a high reflection contrast between the amorphous and crystalline states. The crystallisation temp. is above 1000 deg.C, so that stability of the recorded information is ensured over a long period of time.

    36.
    发明专利
    未知

    公开(公告)号：DE4029874A1

    公开(公告)日：1992-03-26

    申请号：DE4029874

    申请日：1990-09-21

    Applicant: BASF AG

    Inventor： HARTH KLAUS DR ,  HIBST HARTMUT DR

    IPC: G11B5/66 ,  G11B11/10 ,  G11B11/105

    Abstract: The invention relates to a magneto-optical data disc having at least one optically transparent, dimensionally stable substrate and at least one double-layer system comprising two exchange-coupled magnetic layers composed of alloys of rare earths with transition metals and having a vertical magnetic anisotropy. The first magnetic layer, adjacent to the substrate, has a composition corresponding to the formula I RExTM100-x-y-aPtyAa, I and the second magnetic layer on the side of the first magnetic layer remote from the substrate has a composition corresponding to the formula II REuTM100-u-bBb II where RE is at least one element from the series comprising Gd, Tb, Dy, Ho, TM is at least one element from the series comprising Fe, Co, A and B are, independently of each other, at least one element from the series comprising Cr, Nb, Ta, Al, Si, Ni, Mo, and 5

    40.
    发明专利
    未知

    公开(公告)号：DE3416988A1

    公开(公告)日：1985-11-14

    申请号：DE3416988

    申请日：1984-05-09

    Applicant: BASF AG

    Inventor： HIBST HARTMUT DR ,  JAKUSCH HELMUT DR

    IPC: B22F9/22 ,  B22F9/26 ,  C01G49/00 ,  G11B5/706 ,  H01F1/11 ,  B22F9/16 ,  C01G51/00

    Abstract: Finely divided ferrite powder of the general formula CoxFe3-xO4.5-0.5 x where x is from greater than zero to one, having an essentially isotropic particle shape, is prepared by oxidation of ferrite powder of the composition CoxFe3-xO4, where x has the same limits, with an oxygen-containing gas at from 150 DEG to 500 DEG C.

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