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    RECORDING MEDIUM FOR HORIZONTAL RECORDING
    1.
    发明专利
    RECORDING MEDIUM FOR HORIZONTAL RECORDING 失效

    公开(公告)号：JPH02281414A

    公开(公告)日：1990-11-19

    申请号：JP6286890

    申请日：1990-03-15

    Applicant: IBM

    Inventor： RICHIYAADO HENRII AARERUTO ,  JIEEMUZU KENTO HAWAADO ,  SUTEIBUN YUUJIN RANBAATO ,  IAN RIYUUZU SANDAAZU

    IPC: G11B5/673 ,  G11B5/64 ,  G11B5/65 ,  G11B5/66 ,  G11B5/716 ,  G11B5/738

    Abstract: PURPOSE: To suppress noises down to the max. permissible level or below and to enable the recording of data at the max. linear density by making a magnetic recording layer have a laminated structure of relatively thin Copt alloy magnetic films or CoNi alloy magnetic films parted by relatively thin non-magnetic spacer films. CONSTITUTION: The laminated magnetic layer on a substrate consist of the alternate films of the magnetic films of a cobalt base contg. platinum or nickel in the alloy and non-magnetic spacer films. The laminated layers have >=2 sheets of the magnetic films and one sheet of the spacer film. The intrinsic medium noises of the laminated disk structure obtd. in such a manner are decreased at the high linear recording density and the advantage of the improved signal to noise ratio is best achieved when the non-magnetic spacer films are formed as thin as possible, i.e., the spacer films are maintained at the thickness sufficient for effectively shutting off the characteristics of the magnetic films to be adhered afterward.

    VERTICAL MAGNETIC RECORDING MEDIUM
    2.
    发明专利
    VERTICAL MAGNETIC RECORDING MEDIUM 失效

    公开(公告)号：JPS62102419A

    公开(公告)日：1987-05-12

    申请号：JP19302886

    申请日：1986-08-20

    Applicant: IBM

    Inventor： JIEEMUZU KENTO HAWAADO

    IPC: G11B5/66 ,  G11B5/64 ,  G11B5/65 ,  G11B5/73 ,  G11B5/738

    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 (Co100-yCry)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
    3.
    发明专利
    MAGNETIC RECORDING MEDIUM 失效

    公开(公告)号：JPS63187414A

    公开(公告)日：1988-08-03

    申请号：JP29226287

    申请日：1987-11-20

    Applicant: IBM

    Inventor： JIEEMUZU KENTO HAWAADO ,  RANNHAN WANGU

    IPC: G11B5/66 ,  G11B5/64 ,  G11B5/706 ,  G11B5/72 ,  G11B5/73 ,  G11B5/738

    Abstract: An improved thin film metal alloy media for horizontal magnetic recording has a magnetic layer of an alloy comprising cobalt, platinum and chromium, where the chromium concentration in the alloy is greater than 17 at.%. The media exhibits unexpectedly high signal-to-noise ratio (SNR) and minimal time jitter, thereby resulting in a media which is capable for use at high linear recording density. The media also exhibits excellent corrosion resistance because of the chromium present in the alloy, thereby eliminating the need for a barrier layer between the magnetic layer and the protective overcoat.

    GRANULAR MULTILAYER MAGNETIC RELUCTANCE SENSOR
    7.
    发明专利
    GRANULAR MULTILAYER MAGNETIC RELUCTANCE SENSOR 失效

    公开(公告)号：JPH06326377A

    公开(公告)日：1994-11-25

    申请号：JP7349694

    申请日：1994-04-12

    Applicant: IBM

    Inventor： KEBIN ROBAATO KOFUII ,  JIEEMUZU KENTO HAWAADO ,  TOTSUDO REENIE HIRUTON ,  MAIKERU ANDORIYUU PAAKAA

    IPC: G01R33/09 ,  G11B5/39 ,  H01F10/08 ,  H01F10/14 ,  H01F10/32 ,  H01L43/08 ,  H01L43/10 ,  G01R33/06

    Abstract: PURPOSE: To obtain a low magnetic field magnetoresistance sensor by the huge magnetoresistance effect by providing a magnetoresistance sensing elements containing a non-continuous layer made of ferromagnetic material buried in a non-magnetic conductive material. CONSTITUTION: A magnetoresistance(MR) sensing elements 41 in granular multilayer magnetic structure include a layer or plane of multiple platelike grains 31. The magnetic moment of the grains 31 is partially oriented along the inductive anisotropic axis as shown by an arrow 47 to be inducted in the MR sensing elements 41. The bias magnetic field by a bias layer 45 arrays the moment of the grains 31 in a desired direction so as to adjust the operating points of an MR sensor 40 to be a linear part of responsive characteristics. In such a constitution, the MR sensor 40 is suspended on a data truck 44 thereby enabling the magnetic field H in data transition 46 to be applied on the plane of the MR sensing elements 41.

    MAGNETIC RECORDING MEDIUM OF COBALT ALLOY WITH HIGH SATURATED COERCIVE FORCE AND LOW NOISE
    9.
    发明专利
    MAGNETIC RECORDING MEDIUM OF COBALT ALLOY WITH HIGH SATURATED COERCIVE FORCE AND LOW NOISE 失效

    公开(公告)号：JPH03216811A

    公开(公告)日：1991-09-24

    申请号：JP33701490

    申请日：1990-11-30

    Applicant: IBM

    Inventor： JIEEMUZU KENTO HAWAADO

    IPC: C23C14/08 ,  G11B5/64 ,  G11B5/66 ,  G11B5/72 ,  G11B5/73 ,  G11B5/85 ,  G11B5/851

    Abstract: PURPOSE: To provide a thin-film magnetic disk having high saturation coercive force and low noise intrinsic to a medium by incorporating the oxide of elements having relatively low solubility and relatively high affinity to oxygen into the cobalt allay of a magnetic layer. CONSTITUTION: The magnetic layer in the disk contains the oxide of >=1 kinds of the impurity elements in addition to a cobalt alloy material. These elements exhibit the high affinity to oxygen and since the elements have the atom radii extremely different from the atom radii of cobalt, the element exhibit the relatively low solubility in the cobalt. Such elements include yttrium zirconia, etc. The solubility of the impurity elements in the cobalt is low and since the grain boundary region of the magnetic layer is in a place of high energy, the coupling between the grain boundaries is conceivably ruptured by the oxidation of the impurity elements gathering at the grain boundaries. The increase in the saturation coercive force and the decrease of the noise can be resulted from the decrease in the coupling of the internal grains. As a result, both of the high coercive force and the low noise are obtd.

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