Abstract: A magnetic recording medium having a magnetic thin film of a composition expressed as (Co.sub.a Pt.sub.b M.sub.c.sup.I M.sub.d.sup.II) Ox (where a, b, c, d are atomic percent; and x is weight percent). In this composition, a+b+c+d=100, 0<a, 0<b.ltoreq.50, 0<c.ltoreq.20, 0<d.ltoreq.20, 0<x.ltoreq.10. M.sup.I is at least one element selected from P, Si and Ge; and M.sup.II is at least one element selected from B, Ga, Al, In, Sn and Sb. Such magnetic thin film is capable of retaining a large coercive force regardless of its thickness and can be formed without the necessity of raising the base temperature during deposition of a magnetic layer.

Abstract: There is disclosed a perpendicular magnetic recording medium having a magnetic layer comprising magnetic metal corpuscles and their oxide formed on a nonmagnetic substrate, and having perpendicular magnetic recording read-write characteristics improved by dispersing the above described magnetic metal corpuscles in the oxide crystal having a NaCl type crystal structure so that the magnetic metal corpuscles may have an isotropic structure instead of a columnar structure. There are also disclosed a method for fabricating such a perpendicular magnetic recording medium and a read-write machine using such a perpendicular magnetic recording medium.

Abstract: In a magnetic recording medium including a substrate and an alloy thin film magnetic layer formed on the substrate, the magnetic layer is composed of Co.sub.100-y (Pt.sub.100-x Pd.sub.x).sub.y where x is set to 0<x.ltoreq.80 (atomic %), and y is set to 10.ltoreq.y.ltoreq.35 (atomic %). Accordingly, a sufficiently high coercive force in an in-plane direction and a sufficiently high saturation magnetization can be obtained, and the magnetic recording medium can be produced at a low cost.

Abstract: A magnetic recording medium and method of manufacture therefor uses a vertically magnetized film (4) backed by a nonmagnetic substrate (1) made of e.g., glass; a Permalloy.RTM. layer is interposed between the magnetized film and the substrate. An additional layer (3) of a soft amorphous magnetic material, e.g. Co-Zr-Nb or Co-Zr of a suitable thickness (e.g. 50 nm) is interposed between the vertically magnetized medium and the Permalloy.RTM. layer for improving crystalline orientation of the vertically magnetized film and the Permalloy.RTM. layer. The additional layer (3) may be deposited by high frequency sputtering while applying a magnetic field othogonal to the substrate.

Abstract: A magnetic recording medium includes a primary coat formed on a non-magnetic base and a magnetic film of a CoP alloy formed on the primary coat, wherein the primary coat is a metal simple substance selected from the group of Cr, V and W or an alloy of two or more of them, and the magnetic film is at least one of the CoP alloys represented by the following formulae, wherein X, Y, Z, a and b denote atomic percent (at %):Co.sub.X P.sub.Y Pt.sub.Zwhere Y and Z denote 4.ltoreq.Y.ltoreq.11, and 2.ltoreq.Z.ltoreq.10, respectively, with the balance being X;Co.sub.X P.sub.Y Pt.sub.Z Ni.sub.awhere Y, Z and a denote 5.ltoreq.Y.ltoreq.9, 2.ltoreq.Z.ltoreq.10 and 5.ltoreq.a.ltoreq.35, respectively, with the balance being X; andCo.sub.X P.sub.Y Pt.sub.Z Ni.sub.a Cr.sub.bwhere Y, Z and a and b denote 5.ltoreq.Y.ltoreq.9, 2.ltoreq.Z.ltoreq.10, 5.ltoreq.a.ltoreq.35 and 0<b.ltoreq.17, respectively, with the balance being X.

Abstract: A series of braze materials for brazing superalloy substrates at effective brazing temperatures above about 2300.degree. F. is described. The braze materials are formulated as mixtures of cobalt- and nickel-base alloy powders. Each such braze material contains at least two components, one of which is predominantly liquid at the effective brazing temperature, and one of which remains substantially solid at that temperature. The brazing materials solidify by an isothermal solidification process. Unless otherwise limited by the temperature capability of the superalloy substrate being joined, these brazing alloys provide joints that have useful strength at temperatures significantly higher than joints made with prior art brazing alloys.

Abstract: A magnetic recording medium of the longitudinal recording type is comprised of a magnetic layer on one major surface of a non-magnetic substrate wherein the magnetic layer consists of at least two layers of cobalt-based ferromagnetic metal thin film which are formed by oblique evaporation at an incident angle varying between a maximum .theta.max and a minimum .theta.min. Assuming that the layers disposed close to and remote from the substrate are designated lowermost and uppermost layers, respectively, the lowermost layer of ferromagnetic metal thin film is deposited at a smaller .theta.max value than is the uppermost layer of ferromagnetic metal thin film. The uppermost layer is deposited at a greater .theta.min value than is the lowermost layer. The medium is improved in corrosion resistance and electromagnetic properties properties.

Abstract: A femoral component of a knee prosthesis, including a cobalt-based alloy substrate and a titanium fiber metal pad bonded thereto by means of an interlayer of a cobalt-based alloy including nickel. More specifically, a method of bonding a titanium porous surface to a cobalt-based alloy in an orthopaedic implant device, by first applying an interlayer of a cobalt-based alloy including nickel to the substrate and then bonding a porous structure to the interlayer. In one embodiment, an interlayer of L-605 is first applied to a substrate of Co-Cr-Mo by diffusion bonding at approximately 2200.degree. F. and then a fiber metal pad of CP-titanium is diffusion bonded to the interlayer at approximately 1650.degree. F. A layer of CP-titanium may optionally be placed intermediate the fiber metal pad and interlayer before the second diffusion step. In an alternative embodiment, MP-35N alloy may be substituted for the L-605 alloy.

Abstract: An improved magnetic recording member comprising a magnetic metallic film having the composition Co.sub.x Cr.sub.y Ni.sub.z wherein x, y, and z are atomic ratios and 0.45.ltoreq.x<1.0; 0<y.ltoreq.0.25; and x+y+z=1. The magnetic metallic film is formed over a Cr film provided on a surface of a non-magnetic substrate.

Abstract: New cobalt-base wrought alloys containing 24-32% chromium, 14-22% nickel, 2-8% tantalum, 0.02-0.75% cerium and 0.03%-0.10% carbon have an unique combination of high temperature strength, hot corrosion resistance, oxidation-resistance and resistance to thermal fatigue cracking are useful in making weld repairs of cracked nozzles of gas turbine engines, as protective coatings for hot stage components of such engines and other similar purposes.

Abstract: A magnetic thin film alloy comprising cobalt, chromium, nickel and platinum for horizontal recording has a high coercivity, good corrosion resistance, and good noise performance. The platinum has a concentration between 8 to 15 atomic percent, the chromium has a concentration of 3 to 8%, the nickel concentration is 5 to 10% and the balance consist of essentially cobalt. The magnetic alloy has a thickness less than 100 nm and is sputtered on an undercoat consisting of nickel and phosphorus. The phosphorus content is between 5 to 30 weight percent, and the nickel phosphorus has a thickness between 5 and 100 nm. Alternatively, other amorphous metallic thin film undercoats can be applied. By judicious selection of the amount of chromium and nickel in the alloy, the saturation magnetization can be kept high while still maintaining good corrosion resistance. In addition, the sputtered media exhibits low noise.

Abstract: A magnetic thin film recording medium is provided for longitudinal recording of magnetic flux transitions, with the read-back signals enhanced due to a substantial reduction in media noise. The reduced noise level is the result of a unique vacuum deposition process for applying an underlayer to a substrate, prior to deposition of the magnetic thin film. In particular, the underlayer is deposited in a low temperature plasma process under increased pressure of argon or another inert gas and at reduced deposition rates, thus to create voids or interstitial areas which substantially isolate individual grains from their neighboring grains. The subsequently deposited magnetic thin film replicates the crystalline structure and orientation of the chromium underlayer, for relatively isolated grains in the recording layer. This results in lower media noise levels, approaching or equalling those characteristic of particulate media.

Abstract: Disclosed are longitudinal recording media comprising a composite magnetic film formed on a nonmagnetic substrate directly or through a nonmagnetic underlayer, in which all of magnetic thin films constituting the composite magnetic film are magnetically connected, the composite magnetic film has a single in-plane coercivity, and the in-plane coercivity is greater than the in-plane coercivity of a longitudinal magnetically anisotropic magnetic thin film constituting a magnetic thin film nearest to an information recording side among the magnetic thin films constituting the composite film.

Abstract: A magnetic recording member with improved coercive force is obtained by:(a) forming by sputtering or Cr film on a non-magnetic substrate;(b) forming by sputtering an epitaxially grown film of a Co alloy containing at least Cr as an additional metal on the Cr film formed in the step (a);and applying a negative bias voltage to the substrate during at least one of steps (a) and (b).The coercive force of the magnetic recording member is further increased when high-frequency sputtering is used instead of direct current sputtering.

Abstract: A magnetic recording medium for longitudinal recording with a low media noise, a high S/N ratio and high reliabilities in corrosion resistance is disclosed. By making a magnetic layer from a Co-based alloy comprising 1 to 35 at. % of at least one element selected from the group consisting of Pt and Ir, 1 to 17 at. % of at least one element selected from the group consisting of Ti, Zr, Hf, V, Nb, Ta, Cr, Mo, W. Ge and Si, except for Si, whose concentration is 1 to 40 at. %, and 0.1 to 10 at. % of oxygen, a magnetic recording medium for longitudinal recording having an inplane coercivity of 1,200 Oe or more and a coercive squares of not more than 0.85 is obtained.A process for producing the magnetic recording medium for longitudinal medium and a magnetic memory apparatus using the magnetic recording medium for longitudinal recording are also disclosed.

Abstract: An improved sputtering process for making a platinum/cobalt (Pt/Co) multilayer film comprised of alternating layers of platinum and cobalt, said improvement comprising using as the sputter gas krypton, xenon or a mixture thereof.

Abstract: An optical recording medium includes a substrate, a recording layer and a dielectric layer formed on said substrate, said dielectric layer containing a mixture containing at least a chalcogen compound and fluoride compound. The optical recording medium has excellent long term storage stability, excellent recording and erasing cycle characteristics and excellent recording and/or erasing characteristics.

Abstract: A magneto-optic memory medium of an exchange-coupled ferrimagnetic double-layered structure having a recording film of a specific amorphous GdTbFe alloy and a reading film of a specific amorphous GdNdFe alloy.

Abstract: A ceramic package used for a semiconductor device comprises a ceramic base including a die-bonding area and wire-bonding areas defined. A metal underlayer formed on the die-bonding or wire-bonding areas essentially consists of two-plated layers of: a cobalt layer plated on the ceramic base and a nickel layer plated on the cobalt layer. The underlayer is annealed and, them, a gold-plated layer is formed on the underlayer.

Abstract: A magnetic recording medium which comprises a non-magnetic substrate, a Cr undercoat layer formed on the substrate, and a quaternary alloy layer formed on the undercoat layer. The alloy layer consists of the following composition by atomic percent1.ltoreq.Cr.ltoreq.182.ltoreq.Ta.ltoreq.973.ltoreq.Co.ltoreq.971.ltoreq.Pt.ltoreq.10provided that the atomic percent of Cr, Ta and Co is 100 in total and the atomic percent of Pt is based on the total of Cr, Ta and Co.

Abstract: A thin film, solid state device includes a conductive thin film formed on a substrate, with a resistive layer overlying the conductive thin film and with electrical contacts formed on the upper surface of the resistive layer. Electrical current flows between the electrical contacts through the resistive overlayer and the conductive thin film. The resistivity and dimensions of the resistive layer are such that, preferably, only a small fraction of any current flowing between the electrical contacts will flow solely within the resistive layer, yet the magnitude of the current will not be reduced below a desired signal level due to the presence of the resistive layer. The resistive layer is comprised of material which will not diffuse into the thin film conductive layer during device processing. Nitrogen doped tantalum is the preferred material for the resistive layer.

Abstract: A glass to metal seal for mounting an electrical conductor in a metal wall, such as a microelectronic circuit case, and a method of mounting. The metal lead which serves as the electrical conductor is coated with a layer of iron by electroplating and the iron coated lead is mounted in the opening of the metal wall with a glass insulating sleeve. In an alternative embodiment, a barrier layer of electroplated and sintered nickel is provided on the metal lead under the iron layer. A similar layer of iron may be provided on the case wall at the lead opening, and a barrier layer may be provided on the case wall under the iron layer.

Abstract: The Cu system bearing material is disclosed, which comprises a backing material consisting of a steel strip, a sintered alloy layer formed on the backing material by sintering metal or alloy particles, and a bearing layer formed on the sintered alloy layer. The sintered alloy layer consists of a sintered alloy containing 14% to 20% by weight of Pb and 4% to 10% by weight of Sn with the remainder being Cu. This bearing material exhibits satisfactory fatigue strength and a wear-resistant property under high-load high-frictional-speed conditions.

Abstract: A magneto-optical recording medium is disclosed, comprising a substrate having thereon a recording layer comprising laminated thin films of rare earth metals and transition metals, wherein said recording layer has a structure such that a unit of laminated thin films is periodically laminated in the thickness direction of the recording layer, and each unit of said laminated thin films is composed of at least four thin films and includes a thin film of a rare earth metal having disposed adjacent to both surfaces of the thin film of the rare earth metal a thin film of a transition metal as the upper and lower layers.

Abstract: A film of magnetic recording media is formed by sputtering an alloy of cobalt and platinum onto a substrate. The sputtering takes place in a chamber containing argon and nitrogen. The magnetic coercivity of the resulting film is controlled by varying the concentration of nitrogen in the sputtering chamber. By using this technique, the film coercivity is controlled without varying other important parameters such as the saturation magnetization. The film coercivity can also be controlled by varying the concentration of oxygen in the sputtering chamber.

Abstract: The present invention relates to a magnetic recording medium for a magnetic disk unit or the like and, more particularly, to a magnetic recording medium having its recording layer made of a magnetic alloy film with uniform magnetic characteristics. The present magnetic recording medium comprises a non-magnetic substrate, at least two sputtered layers of chromium thin film having a bow-like columnar structure which chromium thin film is laminated on the substrate, another sputtered layer of a magnetic alloy thin film laminated on the chromium thin film, and a protective layer laminated on the magnetic alloy thin film. The present invention is effective in reducing modulation of regenerative output relatively independent of a texture roughness of the substrate.

Abstract: Disclosed are a magnetic recording medium having a magnetic recording layer formed of a magnetic thin film in which rotational hysteresis integral R.sub.H is within a range of from 0.4 to 1.3 in the measurement by a torque magnetometer, and a continuous magnetic recording medium in which crystal grains are substantially randomly arranged on the upper surface of a magnetic recording layer or on the surface of a non-magnetic subbing layer, and in which each of the crystal grains is made to be in the form of an ellipsoid or needle and to have a length-ways axial ratio of a major axis to a minor axis not smaller than 2, more preferably, not smaller than 4.

Abstract: Cobalt-base superalloys having special utility in the production of industrial gas turbine hot gas path components because of their unique combination of properties in specially heat-treated condition including excellent hot corrosion resistance, stress-rupture strength at high temperature, metallurgical stability, tensile ductility and weldability, consist essentially of 0.3 to 0.6% carbon, 27-35% chromium, 9-16% nickel, 6-9% tungsten, 0.45 to 2.0% tantalum, up to 3.0% hafnium, up to 0.7% zirconium, not more than 2.0% iron, 1.5% manganese and silicon and 0.

Abstract: This invention provides a magneto-optic garnet grown by liquid phase epitaxy on a nonmagnetic garnet substrate and having a composition of the following formula (1)Ho.sub.x Tb.sub.y Bi.sub.3-x-y Fe.sub.5 O.sub.12 (1)wherein 0.3.ltoreq.y/x.ltoreq.1.0 and x+y<3.0.According to this invention there is provided a magneto-optic garnet as a Faraday rotator for use in an optical isolator, optical circulator, etc., utilizing Faraday effect, which has a very large Faraday rotation coefficient, a small difference in lattice constant from a nonmagnetic garnet substrate, exhibits a mirror face without causing a film defect (or so-called pit), and has a small temperature dependency.

Abstract: A magnetic thin film materials system (10, 10') is provided, comprising a thin magnetic film (16) formed on a non-magnetic underlayer (14) formed on a substrate (12). In particular, the magnetic film comprises a composition consisting essentially of CoCrPt, with Cr ranging from about 10 to 20 at %, Pt ranging from about 1 to 20 at % and the balance Co. The underlayer consists essentially of chromium. The magnetic layer ranges in thickness from about 200 to 1,200 .ANG., while the non-magnetic underlayer ranges in thickness from about 500 to 5,000 .ANG.. The platinum control film coercivity, while chromium provides corrosion resistance. In addition, chromium controls the recorded magnetic transition noise properties. An increase in Cr content in these alloys beyond about 10 at % increases the corrosion resistance and unexpectedly lowers the transition noise significantly. Coercivities of from about 500 to greater than 2,000 Oe and magnetization-thickness products from 1 to 6.times.10.sup.-3 emu/cm.sup.

Abstract: A structure which is resistant to corrosion at high temperatures comprises a ductile layer of a platinum group metal, such as iridium, and a layer of a refractory metal having a high strength at high temperatures, such as rhenium. A solid solution of the two metals is present between and metallurgically bonded to the two metal layers. Further, the structure may include a layer of ceramic such as zirconia or hafnia on the exposed face of the platinum group metal layer.

Abstract: A primary multi-layer structural component having insulation properties and the method of producing same is disclosed. The structure is comprised of opposing spaced apart face sheets, a plurality of internal core sheets, the core sheets being spaced apart from each other and from the face sheets. Truss means extend internally across the structure, the truss means being connected to and supporting the opposing face sheets, and being integrally connected to and supporting the core sheets. Such structure is produced by forming a stack of metal sheets in contact with each other, including a pair of outer face sheets and a plurality of core sheets positioned between the face sheets, and providing a predetermined stop-off pattern by placing stop-off material in certain preselected areas between the contacting surfaces of adjacent faces sheets and core sheets, and of adjacent core sheets.

Abstract: Sliding layers overlays produced by cathode sputtering comprise a matrix-forming metallic material and at least one other material which is substantially insoluble in the matrix have greatly improved mechanical and corrosion resistance properties, if the insoluble material has a lower melting point than the matrix material, and if the diameters of the particles of the insoluble material are statistically normally distributed with mean x<0.8 .mu.m. Such overlays are produced with the temperature of the substrate maintained below 150.degree. C. during the sputtering process. Coating rates of >0.2 .mu.m [of layer thickness] per minute may be used informing such overlays.

Abstract: A 3,000-10,000 angstrom thick cobalt-platinum (CoPt) magnetic film is deposited onto a chromium (Cr) or tungsten (W) overlayer on a substrate, or is deposited directly onto the substrate. The deposited film has an appreciable component of its C-axis, which is parallel to the [00.2] direction, lying in the plane of the film. The component of the C-axis lies in the plane of the film throughout the entire thickness of the CoPt film, and the resultant magnetic film has a coercivity from 1,300-2,000 oersteds, depending upon which, if any, overlayer is included.The method for producing the magnetic film of the invention teaches sputtering the overlayer onto a substrate maintained approximately at room temperature in an atmosphere of inert gas. After ajdusting the pressure of the gas and controlling the distance between the CoPt sputtering target and the substrate, CoPt is sputtered such that the depositing Co and Pt atoms are thermalized while traversing the distance between the target and the substrate.

Abstract: Soft magnetic laminated materials having both superior wear resistance and a high saturation magnetization comprising Fe-Si alloy films 1 having small magnetostriction, and films 2 of an amorphous alloy or Fe-Si-Al alloy having both small magnetostriction and excellent wear resistance, said first and second films being alternately laminated, the thickness (t.sub.1) of the first film and the thickness (t.sub.

Abstract: The invention relates to a process for the manufacture of multi-layered wear-resistant CVD- or PVD-coatings applied to hardmetal parts containing WC-Co or WC-Ni, where at least one of the layers is a metal-boronitride layer. According to the invention, the boron concentration in the metal-boronitride layer is maintained below the critical level above which in addition a homogeneous boronitride mixed crystal phase a further phase, particularly a diboride phase is formed. A non-boronic, or only slightly boronic, intermediate layer is employed as a diffusion barrier between the hardmetal and the metal-boronitride layer to limit or prevent the formation of brittle tungsten cobalt boron or tungsten nickel boron phases on the external surface of the hardmetal. The metallic boronitride layer can be applied either as a single layer or in multiple layers alternating with other mechanically resistant layers. The hardmetal part is particularly a cutting insert for machining.

Abstract: The disclosure is directed to a magnetically anisotropic recording medium (2) containing a disc-shaped substrate (3) of nonmagnetic material, on the flat side (4) of which is applied a thin lower layer (8) of Si, Ge or Ti, and thereon a Co-containing alloy with vertical magnetic anisotropy. This recording medium is to assure a large signal level without the need for a special magnetically soft substrate. For this purpose, a sandwich-like multilayer structure (7) is provided according to the invention, in which at least three storage layers (10 to 13) of the Co-containing alloy with a respective thickness (d.sub.s) of at most 100 nm are separated by comparatively thinner intermediate layers (15 to 17) of the Si, Ge and/or Ti. The recording medium is advantageously provided for discs of data memories with perpendicular (vertical) magnetization.

Abstract: There is provided an opto-magnetic recording medium having an exchange-coupled three-layered structure in which a recording layer having a high coercive force and a low Curie temperature at room temperature is sandwiched between read layers having a low coercive force and a high Curie temperature, wherein an iron group auxiliary lattice magnetization dominant rare-earth and iron group amorphous alloy thin film is adopted as the recording layer and the read layers, and directions of spontaneous magnetization of the three layers are parallel to each other.

Abstract: A brazing alloy system having a brazing temperature of 1025.degree. to 1080.degree. C., a solidus temperature above 1000.degree. C., a liquidus temperature above 1018.degree. C., consisting of, in weight percent, 5-30 Au, 15-35 Pd, 10-30 Ni, 20-48 Cu, and 15-25 Mn. Preferred brazing alloys are (1) 25 Au, 15 Pd, 18 Ni, 31 Cu, and 11 Mn, (2) 5 Au, 30 Pd, 10 Ni, 40 Cu, and 15 Mn, and (3) 15 Au, 20 Pd, 13 Ni, 41 Cu, and 11 Mn.A method of joining superalloy parts using these alloys as a braze is disclosed, as well as a panel made of a honeycomb structure of thin superalloy metal sandwiched between two sheets of superalloy and brazed with these alloys.

Abstract: A dimensional composition, a dimensionally restored alloy structure and a method of dimensionally restoring gas turbine and the like components that will be subsequently coated which includes low-pressure plasma spraying onto a damaged vane or other components, an alloy composition consisting essentially by weight of 1 to 4% aluminum, 0 to 1.5% hafnium and 0 to 20% nickel in the base composition of the cobalt alloy component, grinding to final dimension and diffusion coating. Tantalum is substituted for columbium where the base composition of the alloy contains columbium.

Abstract: A magneto-optical recording medium comprises a transparent substrate and a magneto-optical recording layer overlaid on the transparent substrate. The magneto-optical recording layer is formed by alternately overlaying a plurality of thin layers containing a rare earth metal-transition metal alloy for magneto-optical recording, and a plurality of thin layers containing at least one metal selected from the group consisting of gold, silver, lead, magnesium, copper, and iridium which are solid solution non-formable metals.

Abstract: An improved mixture of alloy powders is provied for use in treating a preselected article alloy, for example, to repair or join multiple components of the article. The mixture has at least three distinct groups of alloy powders which together define a mixture composition range, with each alloy powder of the groups characterized by a composition and melting range different from the others and from the article alloy. In a preferred form, the mixture composition range comprises, by weight, 15-30% Cr, 1.5-6% W, 0.4-4% Al, 1-11% Ti, 1-6% Ta, up to 1.5% B, up to 0.5% Si, up to 0.2% Zr, up to 3% Mo, up to 0.3% Hf, up to 6% Cb, up to 2% Re, with the balance selected from Co and Ni along with incidental impurities.

Abstract: A process for casting molten transition metal alloy comprising 15 to 35 at % of rare earth metal in which the molten alloy is contacted with a surface (26) of a backing member (25) and the alloy is caused to solidify whilst in contact with the surface (26) such that when the alloy has solidified there is produced a unitary structure (21) comprising a solid layer (27) of the alloy bonded to the backing member (25). The process minimizes the effects of cracking in the alloy and facilitates the use of the alloy as a sputter target.

Abstract: Disclosed is a thin film magnetic recording medium which comprises a substrate and a magnetic layer formed on the substrate, the magnetic layer including a lamination composed of at least a grain size suppression film and a magnetic film formed on each of opposite sides of the grain size suppression film, the grain size suppression film being made of at least a grain size suppressing metal, the magnetic film being made of a cobalt magnetic material, and further disclosed is a method of producing a thin film magnetic recording medium which comprises the step of: dipping a substrate in an electroless plating solution for depositing a crystal of a cobalt magnetic material on the substate to form a first crystal film thereon; adding a metallic salt solution for suppressing growth of a grain size of a crystal structure into the electroless plating solution at least once after a predetermined period of time has passed from the dipping of the substrate under the condition that the substrate is dipped in the electrol

Abstract: A perpendicular magnetic recording medium comprises a recording medium base, a lower layer formed on the recording medium base, and an upper layer formed on the lower layer. The lower layer is made of a first material including cobalt, chromium and one or more elements other than cobalt and chromium. On the other hand, the upper layer is made of a second material including cobalt, chromium and one or more elements other than cobalt and chromium. A quantity of the one or more elements added to cobalt and chromium making up the second material is less than a quantity of the one or more elements added to cobalt and chromium making up the first material.

Abstract: A perpendicular magnetic recording medium comprises a recording medium base, a lower layer formed on the recording medium base, and an upper layer formed on the lower layer. The upper layer is made of cobalt-chromium, and the lower layer at least includes cobalt and chromium.

Abstract: A method for improving oxidation resistance life of a metallic coating deposited on a metallic alloy including boron treats the alloy to reduce the boron prior to depositing the coating. The article provided by using a diffusion coating method has a diffusion zone between the coating and the alloy substrate characterized by the substantial absence of boride needles traversing the diffusion zone from the coating into the alloy.

Abstract: Disclosed herein is a magnetic recording medium comprising a non-magnetic substrate, a magnetic layer for data recording formed on the substrate, and a protective layer of nickel (Ni)-tungsten (W)-boron (B) ternary alloy formed on the magnetic layer. The magnetic recording medium will find use as a the external storage such as magnetic disk for computers.

Abstract: A magnetic recording medium for high density recording comprising a non-magnetic substrate, a Cr undercoat and a magnetic Ni-Cr-Co alloy thin layer formed on the substrate. The magnetic alloy thin layer has a thickness of from 400 to 1200 angstrom and a Cr content of from 3 to 17 atomic percent. As a result, improved magnetic characteristics and corrosion resistance of the medium are ensured.

Abstract: A vertical magnetic recording medium is formed of multiple layers, each layer comprising a cobalt-platinum (CoPt) magnetic film formed on a hexagonal-close-packed (HCP) necleating film. The thickness of each CoPt film in each layer is sufficiently thin to assure that the film has perpendicular magnetic anisotropy. The magnetic properties of the multilayered magnetic film structure can be varied by varying the thickness of the individual films and the number of layers.