Abstract: A data storage device including a substrate; a magnetic structure deposited on the substrate; and a molecular overcoat deposited on the magnetic structure, the molecular overcoat having a thickness of not greater than about 100 ?.

Abstract: A lubricant according to one embodiment includes a first ingredient and a second ingredient, said first ingredient as the main constituent being a first perfluoropolyether compound represented by the formula (1) which has a weight-average molecular weight of 500 to 6000 and a dispersity smaller than 1.

Abstract: An object of the present invention is to provide a perpendicular magnetic recording medium including a suitable lubricating layer with sufficient durability, moisture resistance, and contamination resistance and also maintaining an R/W characteristic. In a typical structure of the present invention, a method of manufacturing a perpendicular magnetic recording medium 100 including a magnetic recording layer 122, a medium protective layer 126, and a lubricating layer 128 in this order on a base 110 includes: a CF bond density measuring step of measuring a CF bond density of a lubricant; and a lubricating layer forming step of forming a lubricating layer with the lubricant when the measured CF bond density is 2.0×1022 to 2.7×1022 atoms/cm3.

Abstract: A lubricant layer for a magnetic recording medium may include a perfluoropolyether having monomer units and end groups selected to provide high thermal stability and good reliability.

Abstract: An apparatus includes a substrate, a recording layer on the substrate, and a nanocomposite layer on the recording layer, the nanocomposite layer including a wear-resistant material and a solid lubricant material, wherein the atomic percentage of the solid lubricant material in the nanocomposite layer is in a range from about 5% to about 99%. A method of making the apparatus is also provided.

Abstract: Embodiments of the present invention provide a magnetic disk having a lubricating layer formed on the surface thereof, which meets all the requirements for adhesiveness, adequate flowability, and strong binding power. In a particular embodiment, a magnetic disk has a magnetic layer, a protective layer, and a lubricating layer which are formed on a non-magnetic substrate, which is characterized in that said lubricating layer is comprised of a lubricant containing a first ingredient and a second ingredient, said first ingredient as the main constituent being a first perfluoropolyether compound represented by the formula (1) below, which has a weight-average molecular weight of 500 to 6000 and a dispersity smaller than 1.

Abstract: A contact magnetic transfer (CMT) master template has a flexible plastic film with a planarized top or upper surface containing magnetic islands separated from one another by nonmagnetic regions. The flexible plastic film is secured at its perimeter to a silicon annulus that provides rigid support at the perimeter of the film. The plastic film is preferably polyimide that has recesses filled with the magnetic material that form the pattern of magnetic islands. The upper surfaces of the islands and the upper surfaces of the nonmagnetic regions form a continuous planar surface. The nonmagnetic regions are formed of chemical-mechanical-polishing (CMP) stop layer material that remains after a CMP process has planarized the upper surface of the plastic film.

Abstract: Not only chemical durability of a glass substrate for an information recording medium is improved, but also no deformation of the substrate and no alteration of substrate characteristics are to be made. A chemical treatment layer formed on the glass substrate surface is made thicker toward a large surface roughness portion of the glass substrate, prior to being subjected to a chemical treatment, from a small surface roughness portion of the glass substrate. Layer thickness D of the resulting chemical treatment layer preferably satisfies the following inequality (1) in view of acquisition of chemical durability. 100 Ra?D?3000 Ra??(1) wherein Ra is surface roughness of the glass substrate prior to being subjected to the chemical treatment.

Abstract: There are provided a composition that exhibits sufficient flowability and also displays high substrate adhesion, and a magnetic recording medium, a head slider and a magnetic recording device that use this composition as a lubricant and are thus not prone to faults. The composition comprises a fluorine-containing polyether represented by formula (1), (in formula (1), p and q represent, independently of the symbols in other formulae, any chosen integers). The composition can be produced by reacting a polymer represented by formula (2) with glycidol, HOCH2CF2O(CF2CF2O)p(CF2O)qCF2CH2OH??(2) (in formula (2), p and q represent, independently of the symbols in other formulae, any chosen integers).

Abstract: A lubricant is obtained by mixing at least one compound selected from specific fluorine-based diester dicarboxylic acid compounds having has two carboxyl groups, two ester bonds, terminal groups each of which is an alkyl group or an alkenyl group, and one fluoroether or one fluoropolyether chain with at least one compound selected from specific fluorine-based diester compounds having two ester bonds, two terminal groups each of which is an alkyl group or an alkenyl group, one fluoroether or one fluoropolyether chain and specific fluorine-based monoester compounds one ester bond, one terminal group that is an alkyl group or an alkenyl group, and one terminal group that is a fluoroalkyl group, a fluoroether group or a fluoropolyether group, and preferably a specific fluorine-based amino-alcohol compound, and this lubricant is used to form a lubricant layer of a magnetic recording medium.

Abstract: The present invention provides a lubricant capable of holding an excellent lubricating property under various types of service conditions, maintaining a lubricating effect for a long period of time and providing excellent traveling property, abrasion resistance, durability and the like, a recording medium using the lubricant and a carboxylic acid type compound constituting the lubricant.

Abstract: A lubricant is provided that achieves a sufficiently small one-molecule-layer film thickness even when it has a high molecular weight, and has an increased reliability in a wide temperature range environment without losing the flying stability, by making the film thickness of a lubricant layer very small when it is used for the magnetic recording medium lubricant layer and/or head slider lubricant layer of a magnetic recording device. This lubricant comprises a fluorine-containing polymer, the lubricant having a relationship: Y<?1.4475X+2.815, wherein Y is a natural logarithm of diffusion coefficient at 23° C. (unit:?m2/s); and X is a viscosity at 20° C. (unit: Pas), or it comprises a fluorine-containing polymer having a particular structure, and with molecular chains between adjacent polar groups that have a number-average molecular weight of not less than 500.

Abstract: To provide a lubricant for recording medium, which is advantageous not only in that it maintains excellent lubricity under various conditions for use and excellent lubricating effect over a long time, but also in that it can impart excellent transport properties and excellent abrasion resistance as well as excellent durability. For example, when C18H37—CH(CH2COOC10H6OH)COORf (wherein Rf represents a saturated or unsaturated partially-fluorinated-alkyl group) is used as a lubricant for magnetic recording medium, there can be obtained a magnetic recording medium having excellent transport properties and excellent abrasion resistance as well as excellent durability.