Abstract: The invention relates to an object having a coating arranged on at least one surface of the object, which comprises at least one antimicrobially active layer having an antimicrobial agent, wherein the agent comprises a copper (I) compound and/or a copper (II) compound.

Abstract: A zinc-based metal plated steel sheet is excellent in tribological properties during press forming. An oxide layer containing crystalline 3Zn(OH)2.ZnSO4.xH2O is formed on a plated surface. The oxide layer has a thickness of 10 nm or more. The crystalline oxide layer is composed of 3Zn(OH)2.ZnSO4.3-5H2O.

Abstract: The invention relates to the antibacterial coating for an implant, which is characterized in that the coating contains copper. The invention also relates to a method of producing an antibacterial coating for an implant, the coating being applied by means of a PVD process, and the method being characterized in that the layer generated contains a copper content.

Abstract: A chain component part has a first coating film formed on an iron base material using a water-based rust preventive paint containing a water-based rust preventive pigment containing a nitrate and having good storing stability. Since zinc is eluted earlier, generation of red rust caused by iron is suppressed, and thus durability is improved. A roller chain includes a zinc-iron alloy ground layer formed on an iron base material by impact zinc plating, a first coating film formed using the water-based rust preventive paint, and a second coating film formed using a water-based top coat paint containing a water-based pigment and a water-soluble or hydrolyzable silane coupling agent containing an amino group.

Abstract: A zinc-based metal plated steel sheet is excellent in tribological properties during press forming. An oxide layer containing crystalline 3Zn(OH)2·ZnSO4·xH2O is formed on a plated surface. The oxide layer has a thickness of 10 nm or more. The crystalline oxide layer is composed of 3Zn(OH)2·ZnSO4·3-5H2O.

Abstract: Metal, ceramic and cermet articles produced from low viscosity suspensions. The articles include micro diameter hollow fibers, meshes and open cell foams. The articles are useful for filters, catalyst media, fuel cell electrodes, body implantation devices, structural materials, vibration and noise control, heat exchangers, heat sinks, heat pipes, heat shields and other applications.

Abstract: A coating composition for zinc- and zinc alloy-coated steel sheets includes: 1 to 30% by weight of hypophosphorous acid, 0.1 to 10% by weight of manganese, 0.01 to 5% by weight of a polyvinyl compound, zinc oxide and the balance of water, and further comprises 20% by weight or less of alcohol, when necessary, wherein the zinc oxide is included in such a content that, when 50 Ml (milliliters) of the coating composition is neutralized and titrated with 0.1N NaOH, the NaOH used for the neutralization titration is present in an amount of 10.0 Ml (milliliters) or less, and a content of free acid in the coating composition is adjusted to such an amount that, when 50 Ml (milliliters) of the coating composition is neutralized and titrated with 0.1N NaOH, the NaOH used for the neutralization titration is present in an amount of 10.0 Ml (milliliters) or less.

Abstract: Disclosed herein is a carrier for manufacturing a substrate, including: two insulation layers, each being provided on one side thereof with a first metal layer and on the other side thereof with a second metal layer; and a third metal layer having a lower melting point than the first metal layer and formed between the two first metal layers respectively formed on the two insulation layers such that the two first metal layers are attached to each other. The carrier is advantageous in that the carrier can be separated by heating the third metal layer, so that the size of a substrate does not change at the time of separating the carrier, thereby maintaining the compatibility between a substrate and manufacturing facilities.

Abstract: Disclosed herein is a carrier for manufacturing a substrate, including: an insulation layer including a first metal layer formed on one side or both sides thereof; a second metal layer formed on one side of the first metal layer; and a third metal layer formed on one side of the second metal layer, wherein the second metal layer has a lower melting point than the first metal layer or the third metal layer. The carrier is advantageous in that a build up layer can be separated from a carrier by heating, so that a routing process is not required, with the result that the size of a substrate does not change when the build up layer is separated from the carrier, thereby reusing the carrier and maintaining the compatibility between the substrate and manufacturing facilities.

Abstract: Disclosed are a weld joint and a stainless steel-based weld metal composition for the weld joint. The composition and weld joint made therefrom are suitable for welding a zinc-based alloy coated steel sheet. The weld is excellent in corrosion resistance and liquid-metal embrittlement crack resistance. This is accomplished by inhibiting liquid-metal embrittlement cracks of the stainless-steel-based weld metal when the zinc-based alloy coating steel sheet is welded using the stainless-steel-based weld metal. The weld joint comprises a welded portion of weld metal made of stainless-steel-based components, the weld metal containing in mass percent (%): C: 0.01-0.1; Si: 0.1-1; Mn: 0.5-2.5; Ni: 5-11; and Cr: 17-25, and the balance being iron and residual impurities, wherein the following expression are met: ?0.81×Cr equivalent+23.2?Ni equivalent?0.95×Cr equivalent?8.1 . . . (1); Ni equivalent=Ni+30×C+0.5×Mn+30×N . . . (2); Cr equivalent=Cr+Mo+1.5×Si . . . (3).

Abstract: A high-quality submerged arc weld metal for 1.25 Cr-0.5 Mo steel that is obtained by carrying out multi-pass welding in a submerged arc welding process with a solid wire and a bonded flux being combined together, is produced in which a strength mismatch with a base material does not occur even after a Post Weld Heat Treatment is carried out for a short time to a long time, and which has high ductility as well as having no weld defect. The submerged arc weld metal for 1.25 Cr-0.5 Mo steel is characterized in that: the weld metal contains, per the total mass of the weld metal, C: 0.06 to 0.12 mass %, Si: 0.15 to 0.30 mass %, Mn: 0.60 to 1.10 mass %, Cr: 1.10 to 1.45 mass % and Mo: 0.45 to 0.60 mass %, wherein O is contained in an amount of 0.022 mass % or less and N is contained in an amount of 0.008 mass % or less, and wherein the balance is Fe and inevitable impurities.

Abstract: A data storage medium includes a haze-prevention layer between a heat-resistant thermoplastic substrate and a reflective metal layer. The haze-prevention layer includes a metal having a tensile modulus of at least about 15×106 pounds per square inch. The data storage medium resists hazing of the reflective layer at elevated temperatures.

Abstract: A reflective article useful, for example, in automotive headlights includes a haze-prevention layer between a heat-resistant thermoplastic substrate and a reflective metal layer. The haze-prevention layer includes a metal having a tensile modulus of at least about 15×106 pounds per square inch. The article resists hazing of the reflective layer at elevated temperatures.

Abstract: A method for forming a plating film, comprising the steps of: applying a plating film onto an object to be plated at a first current density for a predetermined period in a plating bath having a cathode capable of varying current and an anode and; and maintaining the object to be plated at a second current density lower than the first current density. According to the present invention, it is possible to improve solderability of a plating film for conventional lead-free solder by a simple method, which allows the productivity to further enhanced, resulting in a plating film with reduced production costs.

Abstract: An R-T-B magnet (R is at least one kind of rare-earth elements including Y, and T is Fe or Fe and Co) has an electrolytic copper-plating film where the ratio [I(200)/I(111)] of the X-ray diffraction peak intensity I(200) from the (200) plane to the X-ray diffraction peak intensity I(111) from the (111) plane is 0.1-0.45 in the X-ray diffraction by CuKal rays. This electrolytic copper-plating film is formed by an electrolytic copper-plating method using an electrolytic copper-plating solution which contains 20-150 g/L of copper sulphate and 30-250 g/L of chelating agent and contains no agent for reducing copper ions and has a pH adjusted to 10.5-13.5.

Abstract: A hard film for cutting tools which is composed of (Ti1−a−b−c−d, Ala, Crb, Sic, Bd)(C1−aNe) 0.5≦a≦0.8, 0.06≦b, 0≦c≦0.1, 0≦d≦0.1, 0≦c+d≦0.1, a+b+c+d<1, 0.5≦e≦1 (where a, b, c, and d denote respectively the atomic ratios Al, Cr, Si, and B, and e denotes the atomic ratio of N.

Abstract: A method of pretreating a copper surface for protecting the surface from oxidation, by immersing the surface in a solution containing organic solderabilty preservatives, such as BenzoTriAzole, with the addition of a zinc salt. The method is particularly useful in the manufacturing of electronic Printed Circuit Boards for protecting the copper surfaces during the solder processes when the PCB undergoes high temperature. The addition of the zinc salts also gives the additional advantage of increasing the solderabilty properties of the copper surface (i.e. wettability and adhesion).

Abstract: A hard film comprises an oxide film of corundum crystal structure having a lattice constant in the range of 4.779 to 5.000 Å and a thickness not smaller than 0.005 &mgr;m, and an alumina film of corundum crystal structure formed on one of surfaces of the oxide film. The oxide film is formed of Cr2O3, (Fe, Cr)2O3 or (Al, Cr)2O3. The alumina film excellent in heat resistance and wear resistance can be formed on a base object under a low-temperature condition that will not deteriorate the characteristics of the base object.

Abstract: A method of ion implantation using oxygen backfill and a modified surface layer formed therefrom are provided. The method of ion implantation includes the steps of placing a substrate metal in an ion implantation vacuum chamber, introducing oxygen into the ion implantation vacuum chamber and directing a beam of ions at the substrate metal. The modified surface includes a substrate metal and implanted atoms at a surface of the substrate metal. The implanted atoms are integrated with the substrate metal. The substrate metal has an implanted atom concentration of at least 5 atomic % to a depth of over 250 Å.

Abstract: A brass coated metallic wire for use as a reinforcing component in an elastomeric article, such as a motor vehicle tire. The brass coating is formed by depositing alternate layers of copper and zinc on the wire and then drawing the wire under conditions of temperature and pressure suitable to alloy the copper and zinc to form a brass coating on the wire.

Abstract: A brass coated metallic wire for use as a reinforcing component in an elastomeric article, such as a motor vehicle tire. The brass coating is formed by depositing alternate layers of copper and zinc on the wire and then drawing the wire under conditions of temperature and pressure suitable to alloy the copper and zinc to form a brass coating on the wire.

Abstract: Described is a method for producing a diffusion bonded sputtering target assembly which is thermally treated to precipitation harden the backing plate without compromising the diffusion bond integrity. The method includes heat treating and quenching to alloy solution and artificially age the backing plate material after diffusion bonding to a target. Thermal treatment of the diffusion bonded sputtering target assembly includes quenching by partial-immersion in a quenchant and is performed after diffusion bonding and allows for various tempers in the backing plate.

Abstract: A cutting tool insert comprises a hard metal substrate having at least two wear-resistant coatings including an exterior ceramic coating and a coating under the ceramic coating being a metal carbonitride having a nitrogen to carbon atomic ratio between 0.7 and 0.95 which causes the metal carbonitride to form projections into the ceramic coating improving adherence and crater resistance of the ceramic coating. Also disclosed is a cutting tool insert including a hard substrate and at least first and second coatings on at least a portion of said substrate. The first coating is of at least about 2 microns, is in contact with the substrate, and includes at least one of a metal carbide, a metal nitride, and a metal carbonitride of a metal selected from the group consisting of zirconium and hafnium. The second coating may include at least one of a metal carbide, a metal nitride, and a metal oxide of a metal selected from groups IIIA, IVB, VB, and VIB of the periodic table.

Abstract: A method of manufacturing a magnetic disk includes the steps of depositing a sublayer, a Cr layer and a Co based magnetic layer on a substrate. The sublayer causes the Cr crystals to avoid growing with a predominantly (200) orientation. Because of this the magnetic layer will be isotropic in the film plane and independent of any texture or scratch marks in the substrate.

Abstract: A magnetic recording medium having a barrier layer deposited directly on the magnetic recording layer is described. The barrier layer is deposited by sputter deposition under a nitrogen-containing sputtering atmosphere to form a nitrogen-containing chromium or chromium alloy barrier layer. The barrier layer is effective to inhibit migration of cobalt from the underlying magnetic recording layer, reducing corrosion of the medium and improving magnetic recording performance.

Abstract: A method for manufacturing a magnetic disk comprises the step of depositing a metallic layer on a glass substrate and laser texturing the metallic layer. The magnetic disk is then completed by deposition of (a) an underlayer such as Cr or sputtered NiP, (b) a magnetic layer such as a Co or Fe alloy, and (c) a protective overcoat such as ZrO.sub.2, carbon or hydrogenated carbon. By providing the above-mentioned metallic layer, laser texturing can now be used in conjunction with glass substrates.

Abstract: A thin film disk and a disk drive using the thin film disk are described. The disk has an onset layer between the underlayer and the boron containing magnetic layer, for example. The onset layer of the invention is useful because the boron containing magnetic layer material resists being deposited with the C-axis in plane. The onset layer material is selected to promote an in-plane C-axis orientation. When a boron containing magnetic layer is deposited on the onset layer the resulting in-plane PO is improved. The preferred onset layer is of hexagonal closed pack structured material which may be magnetic or nonmagnetic. Materials which are usable for the onset layer include a wide range of pure elements and cobalt alloys such as CoCr, CoPtCr, CoPtCrTa and CoCrB.

Abstract: An object of the present invention is to provide a sliding member which is coated a film having superior wear resistance, superior scuffing resistance and a superior property not to increase an amount of wear on an opponent material (an opponent attacking property). This object can be achieved by providing a sliding member coated by a Cr--V--B--N alloy film 4 on an outer surface 3 thereof. In this case, it is preferable that the Cr--V--B--N alloy film is formed through a physical vapor deposition, particularly ion plating, vacuum deposition, or sputtering. Further, it is preferable that V (Vanadium) content is within the range of 0.1-30 wt. % and the boron (B) content is within the range of 0.05-20 wt. %.

Abstract: A recording medium on a hard disk is provided that includes a magnetic data recording layer on the disk, a hydrogenated carbon buffer layer over the data recording layer, and a nitrogenated carbon overcoat layer over the hydrogenated carbon buffer layer. The composition ratios and thickness of the recording and nitrogenated carbon overcoat layers are suitably controlled to optimum ranges.

Abstract: A horizontal magnetic recording medium that has as its magnetic film a granular film with grains of a chemically-ordered FePt or FePtX (or CoPt or CoPtX) alloy in the tetragonal L1.sub.0 structure uses an etched seed layer beneath the granular film. The granular magnetic film reveals a very high magnetocrystalline anisotropy within the individual grains. The film is produced by sputtering from a single alloy target or cosputtering from several targets. The granular structure and the chemical ordering are controlled by means of sputter parameters, e.g., temperature and deposition rate, and by the use of the etched seed layer that provides a structure for the subsequently sputter-deposited granular magnetic film. The structure of the seed layer is obtained by sputter etching, plasma etching, ion irradiation, or laser irradiation. The magnetic properties, i.e., H.sub.c and areal moment density M.sub.

Abstract: A perpendicular magnetic recording medium is provided by using a ferromagnetic polycrystalline thin film having main components of cobalt and chromium in which the coercivity is 1500 oersted or more and the fluctuation field of magnetic viscosity is 30 oersted or more; the film thickness is controlled within a range from 30 nm to 100 nm. A perpendicular magnetic recording medium with low noise and high output which is suited for high density recording can be obtained and a large capacity magnetic recording and reproducing apparatus can be provided by using this medium.

Abstract: A thin film disk with laminated magnetic layers, for use in a disk drive, is described which exhibits a single switching behavior resulting in a smooth hysteresis loop. This is achieved by depositing a seed layer prior to depositing the Cr or Cr alloy underlayer. The seed layer material is selected to promote a [112] PO in the underlayer and subsequently a [1010] PO in the two or more laminated magnetic layers. The [1010] PO aids in maintaining minimal Hc variations between the magnetic layers. The seed layer can be a B2 type structure material such as NiAl or FeAl or any other material which results in the [112] PO in the underlayer. The underlayer is preferably Cr or a Cr alloy; the magnetic layers are preferably CoPtCr, CoPtCrTa or CoPtCrB. The spacer layer between the magnetic layers may be made from the same material as the underlayer, but may also be different, e.g. an hexagonal crystalline material such as Ru.

Abstract: An Mg based article excellent in plating adhesion which is produced with an Mg alloy base material regardless of its kind by forming a Zn layer of an average thickness of 0.60 .mu.m or more, or a Zn deposition of 0.43 mg/cm.sup.2 or more formed on the Mg alloy base material and a method of producing the article with good efficiency are provided.

Abstract: A magnetic disk yields an excellent off-track characteristics and a high coercive force if a track density is increased. The magnetic disk includes a non-magnetic plate on which data such as a servo signal is formed by convexo-concave patterns and an metallic magnetic film formed on the non-magnetic plate. The metallic magnetic film has a thickness of 50 nm or lower. Between the non-magnetic plate and the metallic magnetic film is formed a primary coat composed of a first and a second coats. The first coat is made of any one of C, Si and Ge and the second coat is made of Cr as a main component. The first coat has a thickness of 2 to 80 nm. The second coat has a thickness of 5 to 108 nm.

Abstract: A composite wire made by coating a core material by solid-phase extrusion of a uniform layer of a corrosion resistant metal onto the core material. The metal includes lead and has uniform, small and longitudinally oriented grains.

Abstract: A magnetic recording medium characterized by comprising: a nonmagnetic substrate; and, provided on the nonmagnetic substrate in the following order, a first underlayer of a nonmagnetic material composed mainly of chromium, a second underlayer of an antiferromagnetic material, with a body-centered cubic structure, having a Neel temperature of at least 60.degree. C., the second underlayer being such that, when the crystal lattice of the antiferromagnetic material is compared with the crystal lattice in the body-centered cubic structure of the first underlayer, the length of a side of the lattice in the (100) face of the former is approximately equal to the length of a diagonal of the lattice in the (100) face of the latter, permitting the second underlayer to be epitaxially grown onto the first underlayer, and a recording layer of a magnetic material composed mainly of cobalt.

Abstract: A magnetic recording medium 101 constituted by a nonmagnetic support 101 made from a high polymer film having a thickness in a range of from 10 .mu.m to 200 .mu.m, a nonmagnetic subbing layer 102 made from a Cr alloy and formed on at least one of opposite surfaces of the nonmagnetic support 101 in the form of a film by sputtering, and a magnetic layer 103 made from a Co alloy and formed on the nonmagnetic subbing layer 102 in the form of a film by sputtering. Preferably, the magnetic recording medium 101 further has a protective layer 104 made from diamond-like carbon, and a lubricating layer 105 made from a hydrocarbon or fluorocarbon lubricant.

Abstract: Chromium-tantalum oxides (Cr-TaO.sub.x), including chromium-tantalum pentoxide (Cr-Ta.sub.2 O.sub.5), chromium-tantalum tetrioxide (Cr-Ta.sub.2 O.sub.4 or Cr-TaO.sub.2), sputtering targets containing them, and their manufacture are disclosed. The targets are characterized by high density, uniform TaO.sub.x distribution, low impedance and stable plasma during the sputtering. The Cr-Ta oxides are used as a thin film sublayer to improve the coercivity and other characteristics of magnetic recording media deposited on metallic or non-metallic substrates used in hard disks for data storage.

Abstract: A magnetic disk which includes a thin film magnetic layer resistant to thermal erasures caused by a rise in localized temperature in the disk due to head disk interference includes a substrate having a thermal diffusivity of less than about 2.times.10.sup.-6 m.sup.2 /sec and a magnetic layer for storing information which is subject to erasure upon such use in localized temperature generated by the head disk interference. An underlayer below the magnetic layer is provided for orienting crystalline structure of the magnetic layer, and the heat sink layer directly above the substrate and directly below the underlayer has a single material such as chromium. The heat sink layer has sufficient thermal diffusivity and sufficient thickness for dissipating heat generated by the rise in localized temperature caused by head disk interference to prevent the erasure of stored information in the magnetic layer.

Abstract: The present invention relates to high-coercivity magnetic recording media used in a hard disk drive. The magnetic recording medium comprises a nonmagnetic substrate, a seed layer comprising NiAl alloy sputtered onto the substrate, a sublayer comprising CrV alloy sputtered onto the seed layer, a magnetic layer comprising CoCrPtTaNb alloy sputtered onto the sublayer, and a carbon overcoat sputtered onto the magnetic layer. The magnetic recording medium of such a structure has improved signal-to-noise ratio, coercivity, overwrite capability, and orientation ratio thereby greatly improving the storage density and read/write capacity of the magnetic recording medium. Furthermore, the coercivity of the magnetic layer of CoCrPtTaNb alloy according to the present invention can be as high as 4000 Oersteds even without the use of the NiAl seed layer.

Abstract: A magnetic recording medium comprising a nonmagnetic substrate; and, provided on the nonmagnetic substrate in the following order: an underlayer comprising chromium as a major component and molybdenum as a minor component; and a recording layer comprising 56 to 78 at % of cobalt, 14 to 22 at % of chromium, 4 to 20 at % of platinum, and a sum of 0.5 to 4 at % of tantalum and niobium, the recording layer having a tBr (a product of the thickness t and the residual magnetization density Br of the recording layer) of 40 to 200 G..mu.m. A longitudinal magnetic recording medium is provided which has high coercive force, contributing to a high reproduction output, and, at the same time, a low noise level.

Abstract: A magnetic recording medium is textured with a pulsed laser light beam through a multiple lens focusing system. The use of a multiple lens focusing system enables the formation of a plurality of relatively uniform protrusions smaller than those obtained with a single lens focusing system, thereby avoiding abrupt local profile changes. In an embodiment, the laser light beam is split, as by offsetting the lenses, to obtain a plurality of pairs of even smaller protrusions than obtained with a laser light beam having a centralized energy profile. The pulsed, multiple lens focused laser light beam can be used to texture a substrate, underlayer or magnetic layer. The resulting laser textured magnetic recording medium exhibits improved flying stability, glide performance and reliability.

Abstract: The present invention relates to an aluminum alloy for a magnetic disk substrate having a composition consisting of, by percent by weight, 2.0 to 6.0% of Mg, 0.05 to 0.15% of Cu, 0.10 to 0.30% of Zn and 0.05 to 0.12% of Zr, wherein the contents of Cu, Zn and Zr satisfy the relationship: 0.15%.ltoreq.2Cu+6Zr-3Zn.ltoreq.0.32% (wherein Cu, Zr, and Zn respectively represent their contents in terms of percent by weight), and the composition further consists of one or both of 0.01 or more to less than 0.05% of Cr and 0.01 or more to less than 0.05% of Mn, impurities consisting of Si, Fe and Ti, which are respectively regulated to be 0.05% or less, 0.05% or less, and 0.02% or less, and other inevitable impurity elements respectively regulated to be 0.02% or less, with the remainder being Al. The present invention also relates to a clad material for a magnetic disk substrate, in which one or both surfaces of a core material, consisting of at least less than 3.

Abstract: An improvement in a magnetic recording medium having an underlayer and a magnetic layer is described. The improvement, effective to increase the coercivity of the medium, includes deposition of an interlayer between the underlayer and the magnetic recording layer. The interlayer is deposited to a thickness of between 10-60 .ANG. and is composed of an CoCr-based alloy having a defined saturation magnetization.

Abstract: A magnetic recording medium able to cope with low flying height of the magnetic head in a CSS system and having fine surface roughness, wherein (1) a metal layer having columnar protrusions formed by the filming of Ti or the like or (2) a resin layer or glass resin layer having irregularly distributed through-holes are provided on the substrate of a magnetic recording medium to impart roughness (texture).

Abstract: Disclosed are magnetic recording media comprising, on a substrate, two or more CrPt based magnetic layers and one or more CrMo based non-magnetic spacer layers between the magnetic layers and processes for preparation thereof. The magnetic recording media of the present invention include magnetic tapes and magnetic disks. The magnetic recording media are capable of suppressing noise generation upon reproducing recorded signals by employing magnetic layers having a small thickness. The magnetic recorders utilizing the above magnetic recording media are also disclosed.

Abstract: A coated hard metal for a cutting tool is excellent in wear resistance and chipping resistance. The coated hard metal includes a hard coating layer on a surface of a base material of cemented carbide or cermet. The hard coating layer includes an inner layer (2) on the base material (1), an intermediate layer (3) on the inner layer (2) and an outer layer (4) on the intermediate layer (3). The inner layer (2) consists of a carbide, a nitride, a carbo-nitride, a carbo-oxide, a carbonitrogen oxide or a boronitride of Ti. The intermediate layer (3) consists of Al.sub.2 O.sub.3 or ZrO.sub.2. The outer layer (4) consists of a carbide, a nitride, a carbo-nitride, a carbo-oxide, a carbonitrogen oxide or a boronitride of Ti. The thickness of the inner layer (2) is 0.1 to 5 .mu.m, the thickness of the intermediate layer (3) is 5 to 50 .mu.m in the case of it being an Al.sub.2 O.sub.3 layer and 0.5 to 20 .mu.m in the case of it being a ZrO.sub.2 layer, and the thickness of the outer layer (4) is 5 to 100 .mu.m.

Abstract: A perpendicular magnetic recording medium wherein a perpendicular magnetic film is formed on a substrate or a nonmagnetic film, and the perpendicular magnetic film contains Co and Cr, the content of the Cr being 22 at. % or higher but 30 at. % or less. The medium is used in a magnetic recording disk drive using a magnetoresistive read head.

Abstract: A magnetic recording medium has a magnetic layer of a Co alloy with a Pt content of about 3 to about 6 atomic % and is given a higher coercive force. The medium includes a ground layer formed on a nonmagnetic base plate and having a composition comprising, as expressed in atomic %, 1 to 6% of Ta, 1 to 6% of Cu and the balance substantially Cr, whereby an increased crystal lattice constant is afforded to the Cr.

Abstract: A magnetic recording medium having low medium noise and suitable for high density magnetic recording is produced with a bicrystal cluster magnetic layer on a glass or glass-ceramic substrate. An underlayer which is formed with a (200) crystallographic orientation induces the formation of a bicrystal cluster microstructure in a magnetic alloy layer epitaxially grown on the underlayer.