Abstract: A magnetic recording medium achieves excellent noise reduction by controlling the crystal orientation of a magnetic layer without thermal processing. The magnetic recording medium includes multiple layers laminated to a substrate. These layers include at least the magnetic layer and a non-magnetic under layer. The magnetic layer has a granular structure consisting of ferromagnetic grains with a hexagonal close-packed structure and non-magnetic grain boundaries composed mainly oxide or a nitride. The non-magnetic under-layer is a material having a body centered cubic crystal structure with a preferential orientation along a (200) plane parallel to a film surface of the under-layer.

Abstract: A manufacturing method of a thin-film magnetic head provided with an MR element includes a step of forming an MR multi-layered structure in which a current flows in a direction perpendicular to surfaces of layers of the MR multi-layered structure, on a lower electrode film, a step of depositing an insulation film on the formed MR multi-layered structure and the lower electrode film, a step of flattening the deposited insulation film until at least upper surface of the MR multi-layered structure is exposed, and a step of forming an upper electrode film on the flattened insulation film and the MR multi-layered structure.

Abstract: This invention provides a disk which has an in-plane oriented magnetic recording layer on a glass, ceramic, or other nonmetallic substrate and a method for making the disk. A thin layer of material is deposited on the substrate to form a texture stop layer. A texturable layer is then deposited on the texture stop layer. This texturable layer is textured before the magnetic layer is deposited. The disk combines all the advantages of a glass or ceramic substrate along with the advantages of an oriented magnetic medium.

Abstract: A method for forming a magnetoresistive (MR) layer first employs a substrate over which is formed a magnetoresistive (MR) layer formed of a magnetoresistive (MR) material. There is then ion implanted selectively, while employing an ion implant method, the magnetoresistive (MR) layer to form: (1) an ion implanted portion of the magnetoresistive (MR) layer formed of an ion implanted magnetoresistive (MR) material; and (2) an adjoining non ion implanted portion of the magnetoresistive (MR) layer formed of the magnetoresistive (MR) material, where the ion implanted magnetoresistive (MR) material is a non magnetoresistive (MR) material. The method may be employed for forming within magnetoresistive (MR) sensor elements magnetoresistive (MR) layers with enhanced dimensional uniformity, and in particular enhanced overlay dimensional uniformity.

Abstract: An object of the present invention is to provide a magnetic recording medium exhibiting excellent noise characteristics. On a substrate, an undercoat film is formed, and a perpendicular magnetic film, in which most of the easy-magnetization axes are oriented vertically with respect to the substrate, is formed on the undercoat film. A rocking curve 21 obtained through &thgr;-2 &thgr; scanning employing X-ray diffraction in relation to the magnetic film has a plurality of local maximum points 22 and 23.

Abstract: Magnetic recording media having a biased soft magnetic underlayer are disclosed. The soft magnetic underlayer includes at least two soft magnetic layers separated by a thin non-magnetic layer. Magnetostatic coupling between the soft magnetic layers causes the magnetizations in the layer to be anti-parallel. The biased soft magnetic underlayer is brought into a substantially single-domain state, thereby reducing or eliminating unwanted noise in the soft underlayer. In a preferred embodiment, the recording media includes a perpendicular magnetic recording disk.

Abstract: A method of texturing the surface of a CSS/landing zone of a substrate for a magnetic recording medium, comprising steps of: (a) providing a disk-shaped substrate having a surface; (b) providing a patterned mask in overlying relation to the substrate surface, (c) selectively implanting ions in portions of the surface of the CSS/landing zone exposed by the patterned mask openings, whereby the height of the selectively ion-implanted portions is increased or decreased relative to the height of non-ion-implanted portions of the CSS/landing zone to form bumps or depressions, thereby providing the surface of the CSS/landing zone with a texture for reducing stiction and friction when the medium is used with a low flying height read/write transducer. Embodiments of the invention include hard disk magnetic recording media with textured CSS/landing zones produced by the inventive ion implation methodology.

Abstract: Provided are a method of manufacturing a magnetoresistive device and a method of manufacturing a thin film magnetic head capable of efficiently forming a magnetoresistive device having an extremely small magnetoresistive film pattern, and capable of reducing variations in dimensions of the magnetoresistive film pattern. Further, provided is a method of forming a thin film pattern capable of efficiently forming a plurality of thin film patterns with different sizes on a same base with accuracy according to the thin film patterns. Electron beam lithography or photolithography is selectively used according to the sizes of patterns to be formed, so while the dimensional accuracy of a portion specifically requiring higher accuracy can be secured, the patterns can be efficiently formed.

Abstract: A magnetoresistance sensor structure is fabricated by providing a substrate structure, depositing a magnetic pinning structure on the substrate structure, and depositing an oxidized copper spacer layer overlying the magnetic pinning structure. The deposition of the oxidized copper spacer layer includes depositing a first copper sublayer, oxidizing the first copper sublayer, depositing a second copper sublayer, and oxidizing the second copper sublayer. More deposition and oxidation steps may be used as necessary. A sensing structure is deposited overlying the oxidized copper spacer layer.

Abstract: The present invention relates to compensated crystalline superlattice ferrimagnets. The ferrimagnets include multiple ferromagnetic layers having different magnetic disordering temperatures in combination with antiferromagnetically coupled layers. The crystalline ferromagnetic layers may include metals or alloys such as Ni, Co and Fe. The crystalline antiferromagnetically coupled layers may include metals or alloys such as Rh, Ir, Cr, Ru, Os, W and Mn. The superlattice ferrimagnets may be used in such applications as data storage or memory layers in thermally assisted magnetic recording media.

Abstract: Magnetic recording disks having a composite soft magnetic layer are provided. The soft magnetic layer includes a relatively thick layer of low saturation moment soft magnetic material and a relatively thin layer of high saturation moment soft magnetic material. In a preferred embodiment, the thin layer of soft magnetic material is deposited over the thick layer, followed by deposition of a magnetically hard perpendicular recording layer.

Abstract: To avoid troubles associated with high-density recording and fast transfer rate, such as decomposition of lubricant involved in a low floating height magnetic head and migration of lubricants involved in high speed rotation of a magnetic recording medium, and to provide a magnetic recording medium which achieves stable resistance to environment and stable lubricating characteristics, a magnetic recording medium includes a base body and the layers formed on the base body, including a non-magnetic metal underlayer, a magnetic layer, a protective layer, and a lubricant layer. The lubricant of the lubricant layer includes a perfluoropolyether liquid lubricant having an alcohol end group(s) and a perfluoropolyether liquid lubricant having an amine end group(s) of tertiary amine structure.

Abstract: A magnetic multi-layer film manufacturing apparatus has a transferring chamber, a plurality of film-depositing chambers, and a robotic transferring device. Each film-depositing chamber has a rotatable substrate holder, a plurality of targets positioned at an incline on an opposing interior surface from the substrate holder, and a double layer rotating shutter mechanism and is controllable to deposit at least one layer of a magnetic multi-layer film structure. Magnetic multi-layer film structures are formed by depositing a plurality of magnetic films divided into a plurality of groups, each one of the plurality of groups deposited in an associated one of the plurality of film-depositing chambers continuously in a laminated state. A first division between successive groups of magnetic films is between a metal oxide film and a magnetic layer continuous therewith and a second division is between an antiferromagnetic layer and a magnetic layer continuous therewith.

Abstract: The magnetic and magnetotransport properties of field-aligned single domain half-metallic CrO2 powders have been studied. Needle-shaped nanoparticles of CrO2 have been aligned in a strong magnetic field. The aligned powder sample shows a strong anisotropy along the alignment direction. The conduction mechanism of the aligned CrO2 powder sample has been examined and is consistent with the intergranular spin dependent tunneling. Negative tunneling magnetoresistance (TMR) of about 41% is achieved in a small field in the vicinity of the coercive field at 5 K. The magnetoresistance (MR) versus field curve shows two well-separated narrow peaks at the coercive fields and resembles that of a magnetic tunnel junction. This junction-like MR results from the narrow switching field distribution of the aligned powders. The results suggest that the aligned magnetic CrO2 particles may find novel applications in spin transport structures and devices.

Abstract: A method for forming a thin conductive lead layer of high sheet conductivity, high hardness, high melting point, high corrosion resistance and lacking the propensity for smearing, oozing, electromigration and nodule formation. Said lead layer is formed upon the hard magnetic longitudinal bias layer of an abutted junction spin-valve type magnetoresistive read head and said read head is therefore suitable for reading high density recorded disks at high RPM.

Abstract: A slowly advancing tape-shaped matrix is pressed into contact with a surface of a rapidly rotating non-magnetic substrate for a magnetic recording medium. An abrasive slurry is added to the matrix. The area contact rate between the matrix and the surface, as well as the contact pressure per unit area between the matrix and the surface are regulated to both polish and slightly roughen the surface in a single process. In the case of a glass presubstrate, the glass is chemically strengthened before being surface-treated.

Abstract: Spindle-shaped magnetic metal particles containing iron as a main component of the present invention, have an average major axis diameter (L) of 0.05 to 0.15 &mgr;m; a coercive force of 111.4 to 143.2 kA/m; a Co content of from 0.5 to less than 5 atm % based on whole Fe; a crystallite size of from 150 to less than 170 Å; a ratio of Al to Co from 1.0:1 to less than 2.0:1; a specific surface area (S) represented by the formula: S≦−160×L+65; an oxidation stability (&Dgr;&sgr;s) of saturation magnetization of not more than 5.0%; and an ignition temperature of not less than 140° C. The spindle-shaped magnetic metal particles containing iron as a main component, exhibit an adequate coercive force, and are excellent in dispersibility, oxidation stability and coercive force distribution despite fine particles, especially notwithstanding the particles have an average major axis diameter as small as 0.05 to 0.15 &mgr;m.

Abstract: A plurality of upper slitting blades and a plurality of lower slitting blades are located such that each of the upper slitting blades stands facing one of the lower slitting blades. The upper slitting blade and the lower slitting blade, which stand facing each other, are located such that a cutting edge vicinity region of the upper slitting blade and a cutting edge vicinity region of the lower slitting blade overlap each other in a radial direction. The plurality of the upper slitting blades and the plurality of the lower slitting blades are rotated to slit a magnetic tape web into magnetic tapes. A cutting edge of each of the upper slitting blades and/or a cutting edge of each of the lower slitting blades has a curved shape.

Abstract: It is an object of the present invention to provide a magnetic recording medium which has a high level of magnetic antisotropy energy, retains stably the state of recording magnetization within the operating temperature range and is suitable for high-density recording with a low noise level, and a magnetic storage device for the magnetic recording medium. For attaining the above object, the magnetic recording film of the magnetic recording medium is characterized in that its magnetic anisotropy energy constant Ku at an absolute temperature of 300 K is greater than 3.6×106 erg/cc and the average particle diameter is larger than 5 nm and smaller than 12 nm.

Abstract: A first thin film including at least one transition metal selected from the group consisting of Co, Fe and Ni, and a second thin film including at least one platinum group element selected from the group consisting of Pt and Pd are prepared. Then, a multilayered structure where said first thin film and said second thin film are stacked is formed. Then, the multilayered structure is heated at the same time or after the formation of said multilayered structure, thereby to counter-diffuse constituent elements of said first thin film and said second thin film and alloy said at least one transition metal and said platinum group element.

Abstract: A method of manufacturing a magnetic recording medium comprises steps of providing a non-magnetic substrate for a magnetic recording medium, the substrate including at least one major surface; forming a layer of a sol-gel on the at least one major surface; forming a pattern, e.g., a servo pattern in an exposed surface of the layer of said sol-gel; and converting the layer of sol-gel to a glass or glass-like layer while preserving the pattern in an exposed surface of said glass or glass-like layer. Embodiments of the invention include magnetic media including a patterned glass or glass-like layer formed from a layer of a hydrophilic sol-gel with the pattern embossed therein by means of a stamper having a hydrophilic surface including a negative image of the pattern.

Abstract: Construction substrates that have one or more coatings are disclosed. In one embodiment the coating is an adhesive mixture that is magnetically induced to attract a magnetic template. The template that is magnetic or magnetically attracted, that is applied to a construction substrate, is used to create a pattern when a subsequent coating is applied to the substrate. It is emphasized that this abstract is provided to comply with the rules requiring an abstract that will allow a searcher or other reader to quickly ascertain the subject matter of the technical disclosure. It is submitted with the understanding that it will not be used to interpret or limit the scope of meaning of the claims.

Abstract: A spin valve structure and a method for manufacturing it are described. The spin valve uses a modified pinned layer that consists of two cobalt iron layers separated by a layer of either ruthenium, iridium, or rhodium. A key feature of the invention is that this spacer layer is significantly thinner (typically 3-4 Angstroms) than similar layers in prior art structures. Normally, when such thin spacer layers are used, annealing fields in excess of 20,000 Oersted are needed to cause the two cobalt iron layers to become antiparallel. The present invention, however, teaches that much lower annealing fields (spanning a limited range) may be used with equal effect. The result is that a very high internal pinning field is created giving devices of this type greater pinned layer stability and reduced pinning reversal. These devices also exhibits a minimum amount of open looping in their hysteresis curves.

Abstract: High areal recording density magnetic recording media with improved signal-to-noise ratio and high thermal stability are formed using oxidized seedlayers to reduce the magnetic grain size and grain size distribution. Embodiments include sputter depositing a NiAl or NiP seedlayer doped with an element having a higher oxidization potential than NiAl or NiP, such as Co or Ti, and oxidizing so that the oxidized dopant element is distributed substantially uniformly throughout the seedlayer to provide increased nucleation sites.

Abstract: The invention concerns a pre-engraved substrate for a memory disc recordable by magnetic, magneto-optical or phase transition constraint, its manufacturing method and the resulting disc. Said pre-engraved substrate comprises a support (1) having at its surface a surface film (2) in a reflecting material and enabling to obtain a surface with optical polish and at least a recordable film (4), the surface film (2) and the film (4) comprising a succession of microgrooves and/or pits (7) representing a pre-formatting signal, the walls (8) of said pits and/or microgrooves (7) being formed in such of films (2) and (4) of the material constituting said film. The invention is useful for making magnetic, magneto-optical and phase transition optical discs, used particularly in the field of computers.

Abstract: A system and method for forming servo patterns on magnetic medium is disclosed. A magnetic film coated with a layer of styrene-acrylonitrile is stamped with a nickel stamper reproducing the negative image of the stamper pattern on the styrene-acrylonitrile. Ions are then accelerated towards the surface of the styrene-acrylonitrile, which stops the ions in the areas where the styrene-acrylonitrile is thick and allows the ions to penetrate through to the magnetic layer in the areas where the styrene-acrylonitrile is thin. The ions, which penetrate through to the magnetic layer, interact with the magnetic layer altering the magnetic layer's structure reducing its coercivity (Hc) and remnant moment (Mrt). This reproduces the stamped styrene-acrylonitrile pattern on the magnetic layer. The styrene-acrylonitrile is then removed by oxygen plasma etching the surface leaving behind a patterned magnetic medium.

Abstract: At least a portion of a free layer structure in a spin valve sensor is composed of nickel iron molybdenum (NiFeMo) so that the free layer structure does not have to be reduced in thickness in order to have a reduced magnetic moment for responding to lower signal fields from smaller bits on a rotating magnetic disk.

Abstract: A master magnetic information carrier has embedded magnetic films that are free from protrusion and recess. The master disk is fabricated by the steps of laminating Co-based soft magnetic film on a resin base plate, forming isolated magnetic films in predetermined region by patterning the magnetic film, pressing a die from above the isolated magnetic films while heating the base plate with the magnetic films thereon, and releasing the die. Since the master disk is a mold product fabricated by pressing the die, the embedded magnetic films and the resin surface portion surrounding the magnetic films are intimately adjoined and protrusions and recesses at the boundary between them are suppressed to a minimum. The surface of the master disk is so smooth and flat that generation of flaws and gouges on the magnetic recording medium and transfer of particles and chemical contaminants to the recording medium in the contact duplication process are reduced.

Abstract: In a device for forming magnetic film which deposits magnetic material on a substrate 12, a device is provided which, before the magnetic film is formed in a magnetic film-forming chamber 11, cleans one or both of the film-forming face and reverse face of the substrate 12 in a cleaning processing chamber 13. The cleaning mechanism carries out cleaning by placing a substrate on a horseshoe-shaped insulator substrate-holding part 51 which moves up and down, and emission of gas from the reverse face of the substrate and the like is brought about by generating Ar plasma between the upper periphery of the substrate, the substrate and a lower insulator 61 of the substrate.

Abstract: An exchange coupling film includes a first antiferromagnetic layer formed on a pinned magnetic layer, and a second antiferromagnetic layer formed thereon. A composition ratio of an element X in the first antiferromagnetic layer is larger than that of the second antiferromagnetic layer. Preferably, a non-aligned state is created at an interface between the first antiferromagnetic layer and the pinned magnetic layer, whereby a large exchange coupling magnetic field is obtained upon heat-treatment.

Abstract: A flexible magnetic recording medium to which data is transferred by being brought into intimate contact with a master carrier which has a land/groove pattern corresponding to the data and also has a surface whose Moh's hardness is 6 to 10. The magnetic recording medium includes a substrate, a non-magnetic layer, and a magnetic layer. The non-magnetic layer and the magnetic layer are coated on the substrate in the recited order. The magnetic layer contains an abrasive comprising diamond particles whose average particle size is 0.03 to 0.5 &mgr;m. The diamond particle content of the abrasive is in a range of 0.1 to 5 wt % of ferromagnetic powder contained in the magnetic layer.

Abstract: Provided are a method of forming a magnetic layer pattern and a method of manufacturing a thin film magnetic head, which can reduce the number of manufacturing steps and thus reduce the manufacturing time. A precursory nonmagnetic layer and a precursory bottom pole layer are formed in this sequence so as to cover a frame pattern formed on an underlayer (a top shield layer) and having an opening. Then, the precursory nonmagnetic layer and the precursory bottom pole layer are patterned by polishing the overall surface by CMP until at least the frame pattern is exposed, and thus a nonmagnetic layer and a bottom pole are selectively formed. The number of manufacturing steps can be reduced and thus the manufacturing time can be reduced, as compared to the case of forming the nonmagnetic layer and the bottom pole without forming the frame pattern.

Abstract: The invention provides a method of treating a material to cause the material to evolve from one phase to a more ordered phase, the method comprising an operation of irradiating the material in which the irradiating particles are suitable, by their nature and by their energy, for inducing displacements of the atoms in the material towards positions that favor ordering of the material. Advantageously, the invention also provides apparatus for magnetically recording information, the apparatus comprising a material deposited on a substrate at a temperature of less than 350° C. and that has been subjected to irradiation with irradiating particles that are suitable, by their nature and their energy, for inducing displacements of the atoms in the material towards positions that favor relaxation of the material.

Abstract: A method for forming segmented through holes in a printed circuit board. The segmented through holes comprise a plurality of electrically conductive pathways disposed on the walls of a single through hole. The segmented through hole can be disposed in a two sided circuit board assembly or in a composite, multi layer circuit board assembly.

Abstract: Substantially spherical magneto-plumbite ferrite (barium or strontium ferrite) particles are formed from well-dispersed ultra-fine substantially spherical iron-based oxide and/or hydroxide particles as precursor particles. The precursor particles are mixed with a colloidal barium or strontium carbonate (BaCO3 or SrCO3), and with small amounts of a byproduct, such as sodium or potassium chloride (NaCl or KCl) or hydroxide (NaOH or KOH) or nitrate (NaNO3 or KNO3), functioning as a flux to lower the calcination temperature. The particles are filtered out of the mixture, dried, and calcined for a time sufficiently long and/or at a temperature sufficiently high to form magneto-plumbite ferrite from the precursor particles, and for a time sufficiently short and/or a temperature sufficiently low to maintain the general spherical shape of the precursor particles.

Abstract: Magnetic recording media exhibiting high SNR and high thermal stability are produced by sputter depositing a magnetic alloy overlying a non-magnetic substrate, e.g., on an underlayer, heating to eliminate thermally unstable small grains thereby increasing the average grain size of the magnetic alloy layer but narrowing the grain size distribution, depositing a layer comprising a non-ferromagnetic element, and then heating to diffuse the non-ferromagnetic element into the grain boundaries of the heat treated magnetic alloy layer. Embodiments include sputter depositing a magnetic alloy layer comprising Co and Pt on an underlayer, heating at a temperature of about 150° C. to about 600° C. to increase the average grain size to about 8 to about 10 nm, depositing a layer comprising Cr, Mn or Ta, at a thickness up to about 25 Å, e.g., up to about 10 Å, on the magnetic alloy layer and heating to diffuse the Cr, Mn or Ta into the grain boundaries of the magnetic alloy layer.

Abstract: An organic substrate having optically-active layers deposited by magnetron sputtering and a preparation process for it are provided. Gas pressure used for carrying out better adhesion by sputtering is high, comprised between 0.8 and 5.0 Pa. Sputtering is particularly suitable for targets of Si, Ti, Zr and organic substrates with or without anti-abrasive coating. Improved adhesion of thin films is obtained.

Abstract: Corrosion resistant magnetic thin film media are fabricated using a CoCr magnetic layer having a stabilized protective chromium oxide film thereon. Stabilization of the protective chromium oxide film is achieved by incorporating a stabilizing element, such as Mo, V, Mn, Nb, Ni or Si, in the magnetic layer, thereby enabling elimination of the protective overcoat, e.g., C-containing protective overcoat, or forming the protective overcoat at a significantly low thickness of less than about 20 Å, e.g., up to about 1 Å. Embodiments include forming a magnetic layer comprising Co and Cr on an underlayer, and then forming a thin magnetic layer containing Co and Cr with the chromium oxide stabilizing element thereon. Embodiments further include introducing the chromium oxide stabilizing element by diffusion or ion implantation into a sputter deposited Co—Cr magnetic alloy layer.

Abstract: A method of patterning at least one object layer, includes a step of forming a mask on the object layer, and a step of selectively etching the object layer using the mask. The mask is made of a magnetic metallic compound with a basic metal of nickel or cobalt containing at least group 3B element and/or group 5B element.

Abstract: A magnetic hard disk having magnetic tracks for storing data which is read or written by a magnetic head floating immediately above the magnetic track while the magnetic hard disk is rotating, and the magnetic head rests on the magnetic hard disk while the magnetic hard disk is not rotating. One aspect of the present invention is that the magnetic hard disk comprises a non-magnetic substrate having a plurality of banks and grooves alternately and concentrically arranged thereon, a magnetic film formed on each of the banks, and non-magnetic material formed on an entire surface of the substrate all over the banks and grooves such that roughness of the upper surface of the non-magnetic material is in a range between 0.5 nm and 3 nm.

Abstract: An object of the present invention is to provide a process for easily producing a magnetic recording medium exhibiting excellent magnetic characteristics. In the present invention, an orientation-determining film is formed on a non-metallic substrate which has undergone texturing, the orientation-determining film is subjected to oxidation or nitridation, and a non-magnetic undercoat film and a magnetic film are formed on the film.

Abstract: A method for forming a bottom spin valve sensor having a synthetic antiferromagnetic pinned (SyAP) layer, antiferromagnetically coupled to a pinning layer, in which one of the layers of the SyAP is formed as a three layer lamination that contains a specularly reflecting oxide layer of FeTaO. The sensor formed according to this method has an extremely high GMR ratio and exhibits good pinning strength.

Abstract: A laminate structure includes an antiferromagnetic layer, a pinned magnetic layer, and a seed layer contacting the antiferromagnetic layer on a side opposite to pinned magnetic layer. The seed layer is constituted mainly by face-centered cubic crystals with (111) planes preferentially oriented. The seed layer is preferably non-magnetic. Layers including the antiferromagnetic layer, a free magnetic layer, and layers therebetween, have (111) planes preferentially oriented.

Abstract: A ferromagnetic film suitable for ultra-high density perpendicular recording, and a process for producing the film. The process generally entails forming a film of ferromagnetic material on a surface of a substrate, such that the film is characterized by perpendicular magnetic anisotropy and comprises a plurality of magnetic domains defined by domain walls perpendicular to a major surface of the film. The ferromagnetic film is formed to have a linear strain defect for the purpose of smoothing and stabilizing the domain walls during subsequent magnetization reversal of the ferromagnetic material. Such smoothing and stabilizing serves to control temporal magnetic noise due to motion of magnetic domains, arrest domain wall motion (reducing velocity) when the film is subjected to the magnetic reversal fields, and controls spatial magnetic noise due to domain wall jaggedness.

Abstract: A manufacturing method of a magnetic memory device, wherein the inventive method does not require any special technique for forming pattern, but bilaterally ensures precision for processing a tunnel magneto-resistive effect element (called TMR element) and self-matching formation of connecting elements. The manufacturing method of a magnetic memory device comprises a processing step of forming a tunnel magneto-resistive effect film sandwiching a tunnel barrier layer between a magnetic pinned layer and a memory layer into a predetermined elementary configuration by applying a mask layer, wherein the mask layer is formed by applying a plating process.

Abstract: In manufacturing a magnetic recording disk, a magnetic film for a recording layer is deposited on a substrate of the magnetic recording disk in a magnetic-film deposition chamber, and the substrate is transferred from the magnetic-film deposition chamber to a lubricant-layer preparation chamber without exposing the substrate to the atmosphere. Then, a lubricant layer is prepared on the substrate in the lubricant-layer preparation chamber.

Abstract: The present invention includes coating composition having magnetic properties for application to a substrate. The coating composition includes a plurality of strontium and or barium hexaferrite particles having a random magnetic pole alignment. The coating composition also includes a binder adhesive capable of suspending the strontium hexaferrite particles. The binder adhesive is a natural rubber capable of adhering in a substantially thin film to the substrate. The strontium hexaferrite particles are normally present between 50% to 98% of the coating composition's total weight when dried on the substrate. The thickness of the film of the coating composition ranges from 0.5 mils to 20 mils, and has 6 to 24 magnetic pole changes per linear inch. The binder adhesive allows for manipulation of the strontium hexaferrite particles to a non-random magnetic pole alignment after the ferromagnetic particles have dried in the binder adhesive on the substrate.

Abstract: A method for producing a disk-shaped substrate 10 used for producing an optical disk includes: (a) forming a protective layer 12a that is larger in area than the disk-shaped substrate 10 on a surface of a transparent plate 11a; and (b) cutting a portion of the plate 11a with the protective layer 12a formed thereon other than an outer edge portion of the protective layer 12a to form a disk shape. According to this producing method, a thin substrate can be prevented from being damaged by forming a protective layer. Furthermore, according to this producing method, a protective layer with a uniform thickness can be formed.

Abstract: The method of manufacturing the magnetic medium for data storage comprising magnetic segments (5) for data storage which alternate regularly with nonmagnetic segments, which method comprises deposition on a substrate (1) from a nonmagnetic material a material having low or zero initial magnetization and capable of varying its magnetic characteristics under the effect of irradiation. The mentioned material is laid on the substrate (1) as a layer (2) in a thickness corresponding to one of the overall size values of any one of the magnetic segment (5) being formed. Then the applied layer (2) is selectively irradiated so as to vary the magnetic characteristics of the material of the layer (2) on the irradiated segments before forming the magnetic segments (5) each having a maximum overall size the ratio between which and any other overall size of this magnetic segment is from 3.5:1 to 15:1.

Abstract: There is disclosed a manufacturing method of a magnetoresistive element of the present invention, comprising: a step of preparing a substrate having a thermal conductivity in a range of 5 to 150 Wm−1K−1; a substrate cooling step of moving the substrate into a vacuum cooling chamber, and cooling the substrate at an absolute temperature of 200 K or less in the vacuum cooling chamber; and a laminated film forming step of moving the cooled substrate into a vacuum film forming chamber, fixing the substrate to a substrate holder, and forming a magnetoresistive laminated film on the substrate while rotating the substrate, so that the manufacturing method of the magnetoresistive element is little in dispersion of element property, high in reliability, and superior in productivity.