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    Thin film vertical magnetic recording medium with a substrate, an intermediate layer and a magnetisable layer
    1.
    发明公开
    Thin film vertical magnetic recording medium with a substrate, an intermediate layer and a magnetisable layer 失效
    薄膜垂直磁记录介质与基板，中间层和可磁化层

    公开(公告)号：EP0220597A3

    公开(公告)日：1988-07-06

    申请号：EP86114203

    申请日：1986-10-14

    Applicant: International Business Machines Corporation

    Inventor： Howard, James Kent

    IPC: G11B05/64 ,  G11B05/66

    CPC classification number: G11B5/7325 ,  G11B5/64 ,  Y10S428/928 ,  Y10T428/12465 ,  Y10T428/12812 ,  Y10T428/12854 ,  Y10T428/12931

    Abstract: The present invention relates to a magnetic recording medium for vertical recording of the type comprising a substrate (1), an intermediate layer (2) formed on the substrate and a magnetisable layer (3) formed on the intermediate layer. A medium according to the invention is characterised in that
    the intermediate layer (2) comprises a first constituent of an element selected from the group consisting of tungsten (W), molybdenum (Mo), niobium (Nb), titanium (Ti), vanadium (V), iridium (Ir) and zirconium (Zr), and a second constituent consisting of either cobalt (Co), chromium (Cr), or a solid substitutional solution alloy of CoCr, wherein the amounts of the first and second constituents are present in a fixed stoichometric ratio so as to form an intermetallic compound with a hexagonal crystalline structure, and
    the magnetisable layer (3) comprises a ternary alloy of the form (Co 100-y Cr y )X, wherein y is approximately in the range of 14 to 22 and wherein X is selected from the group consisting of W, Mo, Nb, Ti and V, and has an hexagonal crystalline structure with its C-axis oriented generally perpendicular to said substrate (1). The hexagonal cell constants of the intermediate layer (2) and the magnetisable layer (3) are related by approximately integral multiples whereby the hexagonal crystalline orientation of the magnetisable layer (3) is enhanced.

    Magnetic recording medium and method of producing the same
    4.
    发明公开
    Magnetic recording medium and method of producing the same 失效
    磁记录介质及其制造方法

    公开(公告)号：EP0174024A3

    公开(公告)日：1987-03-25

    申请号：EP85111217

    申请日：1985-09-05

    Applicant: Matsushita Electric Industrial Co., Ltd.

    Inventor： Kurokawa, Hideo ,  Mitani, Tsutomu ,  Yokoyama, Kazuo ,  Yonezawa, Taketoshi

    IPC: G11B05/66

    CPC classification number: G11B5/72 ,  G11B5/84 ,  Y10S428/90 ,  Y10T428/265

    Abstract: @ A magnetic recording medium has a non-magnetic substrate, a magnetic layer formed on the surface of the substrate from a ferromagnetic material, and a protective film formed on the magnetic layer. The protective film is constituted by a singular layer of continuous or dispersed molecular structures in which carbon element and an element constituting the magnetic layer are bonded directly or indirectly through oxygen and at least one fluorine element is bonded to the carbon element. This magnetic recording medium can be produced by a method comprising preparing a substrate of a non-magnetic material, forming a magnetic layer of a ferromagnetic material on the surface of the substrate, and forming, by a plasma CVD method, a protective film of a fluorine-containing molecular body having a thickness not greater than a value equivalent to 5 A on the surface of the mag tic layer.

    Method for producing a perpendicular magnetic recording medium
    7.
    发明公开
    Method for producing a perpendicular magnetic recording medium 失效
    一种用于生产全磁记录介质的全息磁记录方法

    公开(公告)号：EP0190854A3

    公开(公告)日：1988-07-20

    申请号：EP86300514

    申请日：1986-01-27

    Applicant: TORAY INDUSTRIES, INC.

    Inventor： Akamatsu, Takayoshi ,  Oka, Tethuo ,  Hayashi, Kenji

    IPC: G11B05/85 ,  H01F41/22 ,  G11B05/66

    CPC classification number: G11B5/66 ,  G11B5/85

    Abstract: In a process involving the successive formation of a soft magnetic film substantially consisting of Fe and Ni and a perpendicular magnetic film on a plastic substrate, the soft magnetic film is vacuum-deposited while its formation position is irradiated with an ion-beam so as to prevent cracks and lessen coercive force. Apparatus for carrying out the deposition of the soft magnetic film includes a vacuum chamber (8) divided by a partition (7) into an upper chamber (9) and a lower chamber (10) which can be exhausted through outlets (11) and (12). The film substrate strip (6) is fed from a roll (1) round a cooled drum (3) to a winder (5). An evaporator (16) contains an iron-nickel ingot (15), and ion-beam radiation issues from the source (17). A screen (13) has an aperture (14) which limits the incident angle of the ion-beam onto the position of the substrate (6) passing round the drum (3).

    Abstract translation: 在包括在Fe基上由Fe和Ni构成的软磁性膜和在塑料基板上形成垂直磁性膜的过程中，软磁膜被真空沉积，而其形成位置用离子束照射， 防止裂纹，减轻矫顽力。 用于进行软磁性膜沉积的装置包括由分隔件（7）分成上室（9）的真空室（8）和可通过出口（11）和（ 12）。 薄膜基材条（6）从卷（1）在冷却的滚筒（3）周围进给到卷绕机（5）。 蒸发器（16）包含铁镍锭（15），并且源（17）发出离子束辐射。 屏幕（13）具有将离子束的入射角限制在通过滚筒（3）的基板（6）的位置上的孔（14）。

    Thin film magnetic disc
    8.
    发明公开
    Thin film magnetic disc 失效
    薄膜磁性盘

    公开(公告)号：EP0205239A3

    公开(公告)日：1987-11-19

    申请号：EP86302893

    申请日：1986-04-17

    Applicant: AKASHIC MEMORIES CORPORATION

    Inventor： Scott, John C. ,  Li, Eric K. ,  Washburn, Hudson A. ,  Viswanathan, Nal T.

    IPC: G11B05/66 ,  G11B05/716

    CPC classification number: G11B5/851 ,  G11B5/64

    Abstract: @ A new high quality, low cost, thin-film magnetic recording member is provided, which has a coercive field strength greater than 650 Oe, a saturation magnetization greater than 10,000 Gauss, and a squareness ratio of 0.9 or larger. The member includes a substrate on which is directly sputter deposited a chromium layer, without the use of an intervening nickel-containing layer between the substrate and the chromium. A nickel-cobalt recording layer is then sputter deposited directly onto the chromium layer. In the preferred mode, the start of that nickel-cobalt deposition begins less than 100 seconds after the chromium deposition is terminated and is followed by the sputtering of a protective layer. Before the chromium deposition, the substrate is preheated to drive off adsorbed gases, and to establish the proper conditions forthe chromium deposition. The substrate is also heated during the time between when the chromium deposition ends and the nickel-cobalt deposition begins.

    Film type multilayer magnetic recording medium and method of manufacturing the medium
    9.
    发明公开
    Film type multilayer magnetic recording medium and method of manufacturing the medium 失效
    薄膜型多层磁记录介质及其制造方法

    公开(公告)号：EP0145026A3

    公开(公告)日：1986-02-05

    申请号：EP84115484

    申请日：1984-12-14

    Applicant: Saiteku Corporation

    Inventor： Takahashi, Yasunori

    IPC: G11B05/716 ,  G11B05/66 ,  G11B05/845 ,  G11B05/714

    CPC classification number: G11B5/716 ,  G11B5/66 ,  Y10S428/90 ,  Y10T428/256 ,  Y10T428/257

    Abstract: A film type multilayer magnetic recording medium comprised of a film applied to a substratum in which coating film needle-shaped magnetic grains are orientated with their longitudinal axes perpendicular to the film surface in a multilayer state and having a film thickness of 1.1 to 2.0 times the average length of the grains, has an excellent property, because the angular ratio (Br Bs) of both horizontal and vertical components respectively are 0.6 or more. As a result, it is possible to attain a high density recording. The film type multilayer magnetic recording medium of the present inventions is manufactured by applying a fluid film forming material, in which neddle-shaped magnetic grains are dispersed to form a coating film having the thickness of 1.1 to 2.0 times the average length of the magnetic grains on a substratum, and then drying or hardening the film forming material in a magnetic field orientated perpendicularly toward the film surface.

    Magnetic recording medium
    10.
    发明公开
    Magnetic recording medium 失效
    磁记录介质

    公开(公告)号：EP0077069A3

    公开(公告)日：1985-05-02

    申请号：EP82109425

    申请日：1982-10-12

    Applicant: Hitachi Maxell Ltd.

    Inventor： Karashima, Takato View Heights Room No. 502 ,  Zaitsu, Hiroshi

    IPC: G11B05/70 ,  G11B05/66

    CPC classification number: G11B5/716 ,  G11B5/66 ,  Y10S428/90 ,  Y10T428/24942

    Abstract: A magnetic recording medium having two magnetic layers, which comprises an upper magnetic layer and a lower magnetic layer, said lower magnetic layer having a coercive force of at least 100 oersteds, preferably 100 to 500 oersteds, lower than that of the upper magnetic layer, the thickness of the upper and lower magnetic layers being in the ratio of the thickness of the upper magnetic layer to that of the lower magnetic layer of 1/1 to 1/9, and the total coercive force of the upper and lower magnetic layers being 1,000 oersteds or more. The magnetic recording medium has excellent sensitivity and frequency characteristics at low and high frequency bands with less noise.

    Abstract translation: 1，一种具有两层磁性层的磁记录介质，它包括一上磁层和一下磁层，所述下磁层的矫顽力至少为100奥斯特，最好为100至500奥斯特，低于上磁层的矫顽力， 上和下磁层的厚度是上磁层和下磁层的厚度之比为1/1到1/9，并且上和下磁层的总矫顽力是 1000奥斯特或更多。 磁记录介质在低频和高频段具有优异的灵敏度和频率特性，噪声较小。

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