Abstract:
A shield for use in a sputtering system. The shield includes a support having an inner expanse defining a two-dimensional array of cavities. The cavities are formed of two-dimensionally concave wall surfaces, where the intersections of the wall surfaces of adjacent cavities form a two-dimensional array of edges on the expanse. The shield minimizes the tendency of material deposited on the shield surface, such as sputtered carbon material, from flaking off during a sputtering operation. Also disclosed is a sputtering assembly that employs the shield.
Abstract:
A protective overcoat in a magnetic recording medium is described, where the overcoat extends between an inner-diameter landing zone and an outer-diameter data zone and has a thickness in the landing zone of at least 135 ANGSTROM and a thickness in the data zone of less than 90 ANGSTROM . Also described is a target assembly for use in forming the protective overcoat. The assembly includes a centrally positioned target with inner and outer magnetic means adjacent the target and a sputtering shield positioned between the target and the medium to control the amount and angle of material deposition on the medium.
Abstract:
A target assembly for use in fabricating layered, magnetic recording structures is described. The target assembly has inner and outer concentric targets for sputter depositing on a substrate first and second layers having different compositions. Disposed adjacent each target is a magnetic means, and at least one which is reversible in magnetic-pole polarity. One polarity produces a magnetic flux sufficient to ignite a sputtering plasma in the inner target only, when power is supplied to the inner target at a preselected level. The opposite polarity produces a magnetic flux sufficient to ignite a sputtering plasma in the outer target only, when power is supplied to the outer target at a preselected level. A method of using the target assembly is also described.
Abstract:
A thin-film magnetic recording disc for use with a read/write head in a disc drive is disclosed. To reduce the static and dynamic frictional coefficients of the disc surface, the disc is coated with a lubricant layer composed of a mixture of a polyphenoxycyclotriphosphazene lubricant and a perfluoropolyether oil. Also disclosed is a lubricant composition containing these two components, as well as a method for improving the lubricating properties of a perfluoropolyether oil.
Abstract:
An apparatus for polishing one or more planar substrates, such as magnetic disks, between rotating polishing plates is described. The apparatus is designed to optimize uniformity and flatness of the substrates by maintaining a substantially constant parallel and coaxial alignment between the rotating polishing plates.
Abstract:
A method for forming an overcoat having first and second layers in a magnetic recording medium is described. The first overcoat layer is deposited in a first sputtering chamber where the magnetic means for confining target plasma in the chamber are oriented to retain magnetic field confinement about the target surface and to produce magnetic field lines between directly confronting portions of the confronting sputtering targets. The second overcoat layer is deposited under a nitrogen-containing atmosphere.
Abstract:
A disc-handling apparatus for supporting a magnetic disc during material deposition and for transporting the disc into and out of a deposition station is described. The apparatus has a holder that supports a disc at three contact points by a support and a pair of arms, such that the disc is positively gripped by at least three contact points.