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    SOFT MAGNETIC THIN FILM
    21.
    发明专利
    SOFT MAGNETIC THIN FILM 失效

    公开(公告)号：JPS6278804A

    公开(公告)日：1987-04-11

    申请号：JP21873685

    申请日：1985-10-01

    Applicant: SONY CORP

    Inventor： HAYASHI KAZUHIKO ,  HAYAKAWA MASATOSHI ,  OCHIAI YOSHITAKA ,  MATSUDA HIDEKI ,  ISHIKAWA OSAMU ,  IWASAKI HIROSHI ,  ASO KOICHI

    IPC: H01F10/16 ,  C22C38/00 ,  C22C38/10

    Abstract: PURPOSE:To make the saturated magnetic flux density of the titled thin film higher than that of a Sendust alloy without changing its soft magnetic characteristics and the like by a method wherein Fe, Co, Al and Ge are selected as the constituent elements of the soft magnetic thin film, and the compositional ratio of the above-mentioned elements is set within the prescribed range. CONSTITUTION:In order to increase the density of saturated magnetic flux, the composition of the titled soft magnetic thin film is set as FexCoyAlaGeb (the compositional ratio of x, y, a and b is indicated by atomic %) taking into consideration of the fact that the point of intersection of the line of magnetostriction lambdas=0 with the line of crystal magnetic anisotropy K=O is to be set closer to the side of an Fe high density, and that the rate of reduction of magnetic moment in absolute zero and the addition of Co improve not only the density of saturated magnetic flux but also corrosion-resistance and abrasion resistance. In the above-mentioned constitution, when the adding quantity of Co is too much, the density of saturated magnetic flux and the soft magnetic characteristics are deteriorated in inverse proportion to the corrosion-resistance and the abrasion resistance. Therefore, the compositional ratio of the material used is set as follows. 65

    SOFT MAGNETIC THIN FILM
    22.
    发明专利
    SOFT MAGNETIC THIN FILM 失效

    公开(公告)号：JPS61234510A

    公开(公告)日：1986-10-18

    申请号：JP7733985

    申请日：1985-04-11

    Applicant: SONY CORP

    Inventor： HAYASHI KAZUHIKO ,  HAYAKAWA MASATOSHI ,  OCHIAI YOSHITAKA ,  MATSUDA HIDEKI ,  ISHIKAWA OSAMU ,  IWASAKI HIROSHI ,  ASO KOICHI

    IPC: C22C38/00 ,  G11B5/127 ,  G11B5/31 ,  H01F10/14

    Abstract: PURPOSE:To enable the thin film whose composition is expressed by FeaGabGec and which has the soft magnetic characteristic of the same degree as Sendust alloy and the remarkably high saturated magnetic flux density by specifying a range of the above composition. CONSTITUTION:The composition is expressed by FeaGabGec (wherein a.b. and c show the composition rate by atm%) and a range of this composition is the range of formula. For example, Fe, Ga and Ge are weighed so as to meet the predetermined composition rate and these are fused and cast by use of a high-frequency induction heating furnace. After that, by mechanical process, these are made into the alloy target for sputtering of 4 inches diameter and 4mm thickness. Sputtering is done by using this alloy target and a high-frequency magnetron sputtering device so that a thin film on a crystallized glass substrate is obtained. Furthermore, this thin film is annealed to be cooled gradually and a soft magnetic thin film is obtained. This can meet the enhancement of the coersive force of a magnetic recording medium sufficiently and it becomes possible to contrive the high quality and high recording density.

    SOFT MAGNETIC THIN FILM
    23.
    发明专利
    SOFT MAGNETIC THIN FILM 失效

    公开(公告)号：JPS61234508A

    公开(公告)日：1986-10-18

    申请号：JP7733785

    申请日：1985-04-11

    Applicant: SONY CORP

    Inventor： HAYASHI KAZUHIKO ,  HAYAKAWA MASATOSHI ,  OCHIAI YOSHITAKA ,  MATSUDA HIDEKI ,  ISHIKAWA OSAMU ,  IWASAKI HIROSHI ,  ASO KOICHI

    IPC: C22C38/00 ,  C22C38/06 ,  G11B5/127 ,  G11B5/31 ,  H01F10/14

    Abstract: PURPOSE:To enable the thin film whose composition is expressed by FeaAlbGec and which has the soft magnetic characteristic of the same degree as Sendust alloy and the remarkably high saturated magnetic flux density by specifying a range of the above composition. CONSTITUTION:The composition is expressed by FeaAlbGec (wherein a.b. and c show the composition rate by atm%) and a range of this composition is range of formula. For example, Fe, Al and Ge are weighed so as to meet the predetermined composition rate and these are fused and cast by use of a high-frequency induction heating furnace. After that, by mechanical process, these are made into the alloy target for sputtering of 4 inches diameter and 4mm thickness. Sputtering is done by using this alloy target and a high-frequency magnetron sputtering device so that a thin film on a crystallized glass substrate is obtained. Furthermore, this thin film is annealed to be cooled gradually and a soft magnetic thin film is obtained. This can meet the enhancement of the coersive force of a magnetic recording medium sufficiently and it becomes possible to contrive the high quality and high recording density.

    AMORPHOUS MAGNETIC ALLOY
    24.
    发明专利
    AMORPHOUS MAGNETIC ALLOY 失效

    公开(公告)号：JPS60116742A

    公开(公告)日：1985-06-24

    申请号：JP22586583

    申请日：1983-11-30

    Applicant: SONY CORP

    Inventor： ISHIKAWA OSAMU ,  HAYASHI KAZUHIKO ,  HAYAKAWA MASATOSHI ,  OCHIAI YOSHITAKA ,  MATSUDA HIDEKI ,  ASO KOUICHI

    IPC: C22C32/00

    Abstract: PURPOSE:To obtain a specially suitable amorphous magnetic alloy as a core material of a magnetic head used as a magnetic recording and reproducing for a magnetic recording medium having high coercive force such as a metallic tape, by dispersing and mixing a fine granule of metal carbide selected among TaC, WC, NbC, MoC, VC and Cr3C2. CONSTITUTION:An amorphous magnetic alloy is composed by dispersing and mixing fine granules of a metal carbide selected among TaC, WC, NbC, MoC, VC and Cr3C2 into a base alloy in the ratio of 0.1-10vol%. An average grain size of the fine granule of said metal carbide is in a range of, for example, 0.1- 10.0mu preferably 0.5-1.0mu. In order to prevent the metal carbide from dissolving in the base alloy, the metal element of fine granules of said carbides is desirably dissolved as a component of the base alloy into said base alloy. Namely, when a composition of the base alloy for dispersing, for example, the fine TaC granule is supposed to be an Fe-Co-Ta-B series and said TaC granule is mixed into the base alloy, the TaC granule is hardly dissolved in the base alloy and its magnetic characteristic is deviated not so much from an expected value.

    SOFT MAGNETIC THIN FILM
    26.
    发明专利
    SOFT MAGNETIC THIN FILM 失效

    公开(公告)号：JPS62104110A

    公开(公告)日：1987-05-14

    申请号：JP24462585

    申请日：1985-10-31

    Applicant: SONY CORP

    Inventor： HAYASHI KAZUHIKO ,  HAYAKAWA MASATOSHI ,  ISHIKAWA OSAMU ,  OCHIAI YOSHITAKA ,  MATSUDA HIDEKI ,  IWASAKI HIROSHI ,  ASO KOICHI

    IPC: H01F10/16 ,  C22C38/00 ,  C22C38/10

    Abstract: PURPOSE:To contrive the improvement in the resistance to corrosion and abrasion without deteriorating a soft magnetic characteristic by specifying the composition ranges of Co and Si and further adding Ru of specified atm% in an alloy thin film of Fe-Co-Si group. CONSTITUTION:This soft magnetic thin film is mainly composed of Fe, Co and Si and the composition ranges of said Co and Si are 5-10atm% Co and 15-20atm% Si. Furthermore, Ru of 0.1-10atm% is included. In case of the composition of the soft magnetic thin film as Fe66-xRuxCo13Si21 (figures represent atm%), when the quantity of abrasion is examined while changing the addition quantity (x) of Ru, the quantity of abrasion becomes extremely small according to an increase in addition quantity of Ru, for example, even after the 30hr running of a magnetic head and the more sperior resistance to abrassion than Sendust can be observed when Ru is 4atm%.

    MAGNETICALLY SOFT THIN FILM
    29.
    发明专利
    MAGNETICALLY SOFT THIN FILM 失效

    公开(公告)号：JPS6289312A

    公开(公告)日：1987-04-23

    申请号：JP23046885

    申请日：1985-10-16

    Applicant: SONY CORP

    Inventor： HAYASHI KAZUHIKO ,  HAYAKAWA MASATOSHI ,  ISHIKAWA OSAMU ,  OCHIAI YOSHITAKA ,  MATSUDA HIDEKI ,  IWASAKI HIROSHI ,  ASO KOICHI

    IPC: H01F10/14 ,  C22C38/00 ,  C22C38/02 ,  G11B5/31

    Abstract: PURPOSE:To obtain the titled soft magnetic thin film having a high permeability, an excellent corrosion-resisting property, an excellent abrasion-resisting property and thermary stable property without lowering the density of saturated magnetic flux and also without increasing the magnetic coercive force by a method wherein nitrogen N is added to the magnetic thin film having Fe, Ga and Si as the main component, and the composition of component of the magnetic thin film is specified. CONSTITUTION:The composition of the titled soft magnetic thin film is indicated by the formula of Fea, Gab, Sic, and Nx (provided that the compositional ratio of a, b, c and x is indicated by atom%), their ranges of composition are 55

    MAGNETICALLY SOFT THIN FILM
    30.
    发明专利
    MAGNETICALLY SOFT THIN FILM 失效

    公开(公告)号：JPS6252907A

    公开(公告)日：1987-03-07

    申请号：JP19290385

    申请日：1985-08-31

    Applicant: SONY CORP

    Inventor： HAYAKAWA MASATOSHI ,  HAYASHI KAZUHIKO ,  ASO KOICHI ,  OCHIAI YOSHITAKA ,  MATSUDA HIDEKI ,  ISHIKAWA OSAMU ,  IWASAKI HIROSHI

    IPC: H01F10/16 ,  C22C38/00 ,  C22C38/10

    Abstract: PURPOSE:To achieve high saturated magnetic flux density and to contrive giving excellent magnetically soft characteristics with high permeability in a high frequency region by making the composition ratio of selected a specific quarternary system as component elements in a magnetically soft thin film within a specific composition region. CONSTITUTION:Adding of Al is effective for the improvement of the thermal stability and the magnetic characteristics of an Fe-Co-Si system alloy thin film and a composition of 5-15atom%, Si 10-17atom%, Al 8-13atom% and the remainder Fe is used. The composition ratio of each component element is required to be set within a required range and in the outside of the range, magnetically soft characteristics are deteriorated. A vacuum thin film formation technique is preferable as a method of making a magnetically soft thin film, and sputtering, ion plating, vacuum deposition, cluster ion beam method, etc., are available. Further, since the magnetically soft thin film prepared in this way has in itself high coercive force and its magnetically soft characteristics are not good, removal of the distortion of the film by heat treatment and improvement of the characteristics are preferable.

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