Abstract:
In a method for manufacturing an optical storage medium a first 1 and a second circular substrate 2 are being provided and being joined by means of a W curable resin forming an intermediate bonding layer. Then said two bonded substrates are being illuminated with UV light with the exception of the very outer edge of the bonded disc. Afterwards said two bonded disks are being spun and thereby a removal of unwanted resin (adhesive) from the outer edge takes place.
Abstract:
It is shown a method and apparatus for distributing a viscous liquid over a surface of a substrate with high homogeneity in a defined area, e. g. on a semiconductor wafer or a data storage media, by conditioning the liquid on the substrate thermally in a first step and exposing it to UV radiation in two further steps, locally specific before or during the spin coating process.
Abstract:
A method for dispensing a viscous liquid onto a rotating, disk-shaped substrate comprises the steps of Positioning the tip of a nozzle for dispensing said viscous liquid at a first distance relative to a surface of said substrate during start of the dispensing, thereby allowing the viscous liquid (4) to make a controlled first contact with the substrate. Then the gap between said nozzle and the surface of said substrate is increased to a second distance during dispensing. Accordingly, an apparatus for dispensing a viscous liquid comprises a nozzle with a tip for dispensing said viscous liquid and means for changing the distance between said nozzle and the surface of said substrate.
Abstract:
A method for bonding of disk shaped substrates comprises the steps of providing a first and a second substrate, applying a liquid adhesive to a first bonding surface and a second surface, irradiating the lacquered surface of at least one of the substrates with UV light for increasing the viscosity of the lacquer, joining the substrates in vacuum, irradiating the joined disk with UV light for increasing the viscosity of the lacquer in between the joined disks, placing the disk onto a rotatable chuck, rotating the disc with a rotation speed preferably >500rpm, and finally separating the 2 substrates to leave the full bonding layer on one of the substrates.
Abstract:
A method and device for manufacturing a disc-shaped workpiece comprises the steps of producing a first and second disc-shaped substrate, applying an adhesive on at least one of the flat sides of said first and second substrates, bonding said substrates to form said disc-shaped workpiece and removing an excess of adhesive at the outer rim of the disc shaped workpiece by means of a liquid while rotating the workpiece on a rotating table. The liquid is being dispensed by a supply system comprising one or severeal nozzles, used liquid is collected by a suction device.
Abstract:
A perpendicular magnetic recording disk has a granular Co-based ferromagnetic alloy recording layer (RL) with oxides of a selected metal (Ta or Nb) and a reduced-thickness exchange-break layer (EBL) between the RL and the soft magnetic underlayer (SUL). A perpendicular magnetic recording system that includes the disk, the write head and the read head, has an improved ability to write to the RL because of the reduced-thickness EBL.
Abstract:
A workpiece is manufactured using a magnetron source that has an optimized yield of sputtered-off material as well as service life of the target. Good distribution values of the layer on the workpiece are obtained that are stable over the entire target service life, and a concave sputter face in a configuration with small target-to-workpiece distance is combined with a magnet system to form the magnetron electron trap in which the outer pole of the magnetron electron trap is stationary and an eccentrically disposed inner pole with a second outer pole part is rotatable about the central source axis.
Abstract:
For vacuum treatment of workpieces by a multitude of distinct processing stations (P11-P1n, P21-P2m) the processing stations are grouped in two groups (I and II). The workpieces are handled towards and from the processing stations of the first group (I) simultaneously, whereat the workpieces are treated by the processing stations of the second group (II) in a selectable individual sequence.
Abstract:
A perpendicular magnetic recording disk has a soft magnetic underlayer (SUL) that has high corrosion resistance as well as high moment. The material of the SUL is an alloy comprising Co, Fe, X, and Y; where X is Ta or Nb, Y is Zr or Hf, and the combined amount of X and Y present in the alloy is between about 10 and 20 atomic percent. The atomic ratio of Co to Fe in the alloy is between about 90:10 to 10:90, preferably between about 25:75 and 35:65. The SUL may be a single-layer SUL or a multilayer SUL formed of multiple soft magnetic layers separated by an interlayer film or films.
Abstract:
A perpendicular magnetic recording disk has an improved recording layer of a granular CoPtCr-based ferromagnetic alloy with inter-granular material made up of one or more oxides of Cr and one or more oxides of one or more of a segregant of Si, Ta, Ti, B, Nb or Hf, wherein the amount of oxygen present in the recording layer is greater than about 22 atomic percent and less than about 35 atomic percent. The amount of oxygen in the recording layer is substantially greater than the amount required for the stoichiometric oxide or oxides of the segregant or segregants, and a substantial portion of the oxygen present in the recording layer is present in the inter-granular material. The recording layer exhibits high signal-to-noise ratio (SNR), a coercivity Hc greater than about 5000 Oe and a nucleation field Hn greater (more negative) than about −1500 Oe.