Abstract: A compound of the formula (1), lubricant containing the compound and magnetic disk C6H4—(O—Z—R—X)2??(1) wherein Z is —CH2CH2O— or —CH2CH(OH)CH2O—, R is —CH2CF2CF2CF2O(CF2CF2CF2CF2O)nCF2CF2CF2CH2—, n is a real number of 0 to 20, X is —OH, —O(CH2)mOH, —OCH2CH(OH)CH2OH, —OCH2CH(OH)CH2O—C6H5 or —OCH2CH(OH)CH2O—C6H4—OCH3, m is an integer of 1 to 6.

Abstract: A magnetic recording medium includes: a substrate, and a magnetic recording layer that is made from a material having the chemical formula of FexMnyPtz, and that has a bottom surface and an upper surface; wherein x, y, and z indicate average atomic concentrations for Fe, Mn, and Pt, and x+y+z is 100, x and y being greater than 0 and not greater than 65, z being in the range from 35 to 60; and wherein atomic concentration of Fe is gradually decreased from the upper surface to the bottom surface, and atomic concentration of Mn is gradually increased from the upper surface to the bottom surface so that the ferromagnetic property of the magnetic recording layer is gradually reduced from the upper surface to the bottom surface.

Abstract: Embodiments of the present invention provide a perpendicular magnetic recording medium with less medium noise, excellent overwrite characteristics, and scratch resistance. According to one embodiment, when an Ar gas with addition of a micro-amount of oxygen is used upon forming an upper Ru intermediate layer, a micro-structure of a magnetic layer formed thereon can be formed in a state where no magnetic oxide region is segregated and the magnetic crystal grains are isolated. In this case, a gas pressure for forming the upper intermediate layer is set to 5 Pa or more and 12 Pa or less which is a region much higher compared with 0.5 Pa or more and 1 Pa for the lower Ru intermediate layer.

Abstract: A magnetic storage medium is formed of magnetic nanoparticles that are encapsulated within nanotubes (e.g., carbon nanotubes), which are arranged in a substrate to facilitate the reading and writing of information by a read/write head. The substrate may be flexible or rigid. Information is stored on the magnetic nanoparticles via the read/write head of a storage device. These magnetic nanoparticles are arranged into data tracks to store information through encapsulation within the carbon nanotubes. As carbon nanotubes are bendable, the carbon nanotubes may be arranged on flexible or rigid substrates, such as a polymer tape or disk for flexible media, or a glass substrate for rigid disk. A polymer may assist holding the nanoparticle filled carbon-tubes to the substrate.

Abstract: According to one embodiment, a lubricant includes a perfluoropolyether having a chemical structure of: wherein Rf is at least one of: —CF2O(CF2CF2O)m(CF2O)nCF2— and —CF2CF2O(CF2CF2CF2O)kCF2CF2—, with m representing 0 or a positive integer, n representing 0 or a positive integer, and k representing 0 or a positive integer, and wherein R1 to R4 are selected from a group consisting of —H or with at least one of R1 to R4 being

Abstract: A perpendicular magnetic media includes a substrate, a patterned template, a seed layer and a magnetic layer. The patterned template is formed on the substrate and includes a plurality of growth sites that are evenly spaced apart from each other. The seed layer is formed over the patterned template and the exposed areas of the substrate. Magnetic material is sputter deposited onto the seed layer with one grain of the magnetic material nucleated over each of the growth sites. The grain size distribution of the magnetic material is reduced by controlling the locations of the growth sites which optimizes the performance of the perpendicular magnetic media.

Abstract: A surface agent includes two end portions and a middle portion disposed between the end portions. The end portions include a terminal section and a midsection. The terminal section includes at least one surface active functional group. The midsection includes at least one perfluoroethyl ether unit. The middle portion includes at least one perfluorobutyl ether unit.

Abstract: An object of the present invention is to provide a method of manufacturing a perpendicular magnetic recording medium (100) in which both of a coercive force Hc and reliability can be achieved at a higher level even with heating at the time of forming a medium protective layer (126) and to provide the perpendicular magnetic recording medium (100).

Abstract: An aspect of the present invention relates to a magnetic tape comprising a nonmagnetic layer containing a nonmagnetic powder and a binder and a magnetic layer containing a ferromagnetic powder and a binder in this order on a nonmagnetic support. The nonmagnetic layer is a radiation-cured layer formed by curing with radiation a given radiation-curable composition. The nonmagnetic layer has a thickness ranging from 0.5 to 1.3 ?m. The relation between the nonmagnetic powder and the binder component contained in the radiation-curable composition satisfies equation (I): 480?(BET specific surface area of the nonmagnetic powder (m2/g)×weight of the nonmagnetic powder (g))/weight of the binder component (g)?650??(I).

Abstract: A perpendicular magnetic recording medium is disclosed which is capable of reducing the orientational dispersion and crystal grain size of a magnetic recording layer, simultaneously reducing the thickness of a non-magnetic intermediate layer, hence, reducing noise, and improving S/N ratio and recording density characteristics. The medium includes a non-magnetic substrate, soft magnetic underlayer, seed layer, first non-magnetic intermediate layer, second non-magnetic intermediate layer, granular magnetic recording layer, exchange coupling force control layer, non-granular magnetic recording layer, protective layer, and lubricant layer sequentially formed on the non-magnetic substrate. The first and second non-magnetic intermediate layers are laminated to form a two-layer non-magnetic intermediate layer and the seed layer is made of a material having an fcc structure.

Abstract: A magnetic memory device includes a track in which different non-magnetic layers are respectively formed on upper and lower surfaces of a magnetic layer. One of the two non-magnetic layers includes an element having an atomic number greater than or equal to 12. Accordingly, the magnetic layer has a relatively high non-adiabaticity (?).

Abstract: Systems and methods for forming magnetic media with an underlayer are provided. One such method includes providing a non-magnetic substrate, forming a seed layer above the substrate, the seed layer including MgO, forming an underlayer on the seed layer, the underlayer including a material selected from the group consisting of Pd, Pt, W, Fe, V, Cu, and Ag, and forming a magnetic recording layer on the underlayer, the recording layer including FePt oxide.

Abstract: An aspect of the present invention relates to a magnetic recording medium comprising on one surface of a nonmagnetic support a nonmagnetic layer containing a nonmagnetic powder and a binder and a magnetic layer containing a ferromagnetic powder and a binder in this order, as well as comprising a backcoat layer on the other surface of the nonmagnetic support. The nonmagnetic layer is a radiation-cured layer formed by curing with radiation a given radiation-curable composition, and the backcoat layer comprises filler particles with an average primary particle diameter, D50, ranging from 0.05 to 1.0 ?m, the filler particles being selected from the group consisting of organic polymer particles and inorganic colloidal particles.

Abstract: A perpendicular magnetic recording medium that is excellent in terms of electromagnetic conversion characteristics and can achieve the demand for the recording density growth, and a magnetic recording and reproducing apparatus provided with the perpendicular magnetic recording medium are provided. The perpendicular magnetic recording medium has at least a backing layer, an underlayer, an intermediate layer, and a perpendicular magnetic recording layer sequentially laminated on a non-magnetic substrate, in which the backing layer includes at least a soft magnetic film having an amorphous structure; the underlayer includes a first underlayer and a second underlayer laminated from the non-magnetic substrate side; the first underlayer is an fcc-structured alloy layer including an fcc-structured element and a bcc-structured element, the second underlayer includes a NiW alloy; and the intermediate layer includes Ru or a Ru alloy.

Abstract: A binder composition for a magnetic recording medium contains a vinyl copolymer having structural units denoted by each of formulas [1], [2] and [3]. In formula [1], R1 is hydrogen, halogen, or methyl, L1 is a single bond or a divalent linking group, and Y is an alicyclic group. In formula [2], R2 is hydrogen, halogen, or methyl, L2 is a single bond or a divalent linking group, and Z is a hydrocarbon group with a carbon number of from 8 to 50.

Abstract: In one embodiment, a perpendicular magnetic recording medium includes a substrate, a soft-magnetic underlayer above the substrate, a seed layer above the soft-magnetic underlayer, a first intermediate layer above the seed layer, a second intermediate layer above the first intermediate layer, a recording layer above the second intermediate layer, and a protective layer above the recording layer. The second intermediate layer includes an Ru alloy having an element selected from a group consisting of: Ti in a range from about 20 at. % to about 50 at. %, Nb in a range from about 20 at. % to about 50 at. %, Al in a range from about 20 at. % to about 40 at. %, Ta in a range from about 30 at. % to about 50 at. %, and Si in a range about 20 at. % to about 40 at. %. Other magnetic media and systems using this media are described according to more embodiments.

Abstract: A method for manufacturing a magnetic film includes preparing a foundation layer containing a noble metal element and a base metal element, and depositing a plated layer of a magnetic material on the foundation layer by pulse plating.

Abstract: Subject: A process for producing a magnetic recording medium, having a magnetic recording layer and a protective layer on a substrate which is a non-magnetic support, wherein the medium is able to greatly inhibit migration of a lubricant from the protective layer to the surface of the metal pressing plate having a mirrored finish in a hot pressing step during production of the magnetic recording medium, while maintaining satisfactory scratch resistance, suitable adhesion with the magnetic recording layer and the protective layer, and excellent read and write properties of the magnetic recording medium.

Abstract: A perpendicular magnetic write head includes: a magnetic pole having an end face on an air bearing surface; and side shield layers each having an end face on the air bearing surface, and arranged on both sides, in a write track width direction, of the magnetic pole with a side gap in between. The end face of the magnetic pole has a geometry in which a width at a trailing edge is larger than a width at a leading edge. Relationship D1<D2, D1<D3, and D3?D2 are satisfied in the air bearing surface, where D1 is a gap length of the side gap at the trailing edge, D2 is a gap length of the side gap at the leading edge, and D3 is a gap length of the side gap at any position between the trailing edge and the leading edge.

Abstract: In order to produce a wire electrode having a core consisting of a copper/zinc alloy and to produce a specific sheath layer, the sheath layer is coated onto the core at a temperature at which no diffusion occurs. The wire electrode is subsequently heated at a heating speed higher than 10° C. per second, briefly annealed at temperatures above 500° C. and subsequently cooled again very rapidly at cooling speeds higher than 10° C. per second.