Abstract: A tape-type magnetic recording medium, includes a substrate; and a magnetic layer provided on the substrate. In a case where wmax and wmin are respectively maximum and minimum of average values of width of the magnetic recording medium measured under four environments whose temperature and relative humidity are (10° C., 10%), (10° C., 80%), (29° C., 80%), and (45° C., 10%), respectively, wmax and wmin satisfy a relation of (wmax?wmin)/wmin?400 [ppm]. The substrate contains polyester, and the magnetic layer has a squareness ratio of 65% or more in the vertical direction.

Abstract: A perpendicular magnetic recording (PMR) disk has a patterned template layer for the growth of the magnetic grains and the nonmagnetic material surrounding the grains. The template layer is a substantially planar platinum (Pt) or palladium (Pd) layer that is patterned to have Pt or Pd regions arranged in a hexagonal-close-packed (hcp) pattern with the Pt or Pd regions surrounded by Pt-oxide or Pd-oxide regions. The two separate regions of the template layer have different surface chemistries and energies, which provide a “chemical contrast” to impinging atoms during deposition of the metallic magnetic material and nonmagnetic (typically oxide) material, effectively guiding the deposition. The metallic magnetic material is preferentially deposited on the pristine, epitaxial Pt or Pd regions to form the magnetic grains, while the oxide migrates to the oxidized Pt or Pd regions due to the matching of lower surface energy.

Abstract: The magnetic recording medium comprises protrusions on a surface of a magnetic layer such that when protrusions of equal to or more than 8 nm in height as measured by AFM on the surface of the magnetic layer are divided into protrusions A formed of a spherical material and protrusions B formed of a non-spherical material, a value a, obtained by adding three times a standard deviation ? of heights of protrusions A to an average value of the heights of protrusions A, a value b, obtained by adding three times a standard deviation ? of heights of protrusions B to an average value of the heights of protrusions B, and a difference c, obtained by subtracting b from a, are calculated, conditions 13 nm?a?25 nm, 13 nm?b?25 nm, and 0.0 nm?c?10 nm are satisfied.

Abstract: A magnetic stack includes a substrate and a magnetic recording layer disposed over the substrate. The magnetic recording layer comprises magnetic crystalline grains and a segregant disposed between grain boundaries of the crystalline grains. One or both of the magnetic crystalline grains and the segregant are doped with a rare earth or transition metal dopant in an amount that provides the magnetic recording layer with a magnetic damping value, ?, between about 0.1 to about 1.

Abstract: The carbon black composition includes carbon black and an amine compound denoted by formula (1) in a solvent: wherein, in formula (1), n denotes an integer falling within a range of 2 to 4, each of U, V, X, and Y independently denotes a substituent that comprises at least one carbon atom and binds, through the carbon atom, to a carbon atom to which the substituent substitutes, and each of W and Z independently denotes a hydrogen atom or a substituent.

Abstract: The present invention relates to a method for visualization of non-visible information on a packaging material to provide traceability. The method comprises the steps of: reading the non-visible information from the packaging material by means of a magnetic head reader, processing the non-visible information in a central processing unit together with additional new non-visible information, and printing an optional portion of the amount of combined non-visible information onto the packaging material as a traceability marking. The invention also relates to a device for carrying out the method and a packaging line with a filling machine making use of the device.

Abstract: According to one embodiment, there is provided a nanoparticle composite material, including nanoparticle aggregates in a shape having an average height of 20 nm or more and 2 ?m or less and having an average aspect ratio of 5 or more, the nanoparticle aggregates including metal nanoparticles having an average diameter of 1 nm or more and 20 nm or less and containing at least one magnetic metals selected from the group consisting of Fe, Co and Ni and binder existing between the nanoparticle aggregates.

Abstract: An aspect of the present invention relates to a method of manufacturing magnetic powder, which comprises adding an alkali metal salt compound comprising a substituent selected from the group consisting of an alkali metal salt of a carboxyl group and an alkali metal salt of a hydroxyl group to a water-based magnetic liquid comprising magnetic particles dispersed in an acidic water-based solvent to cause the magnetic particles to aggregate in the water-based magnetic liquid; and collecting the aggregated magnetic particles to obtain the magnetic powder.

Abstract: An aspect of the present invention relates to a carbon black composition, which comprises carbon black; an organic tertiary amine selected from the group consisting of an aliphatic tertiary monoamine and an alicyclic tertiary amine; and at least one organic solvent selected from the group consisting of methyl ethyl ketone, cyclohexanone, isophorone, and ethanol.

Abstract: A magnetic tape produced by cutting a magnetic sheet with a wide breadth into a tape having a predetermined width using a cutting device, in which the magnetic sheet has a magnetic layer containing magnetic powder and a hinder formed on one surface of a non-magnetic substrate having a thickness of 4 ?m or less, and a center line average height (Ra) along a roughness curve of a cut edge of the magnetic tape is from 0.08 to 0.25 ?m.

Abstract: The present invention relates to a magnetic recording medium comprising a magnetic layer comprising a hexagonal ferrite powder and a binder on one surface of a nonmagnetic support and a backcoat layer on the other surface of the nonmagnetic support. A power spectrum density at a pitch of 10 micrometers ranges from 800 to 10,000 nm3 on the magnetic layer surface, a power spectrum density at a pitch of 10 micrometers ranges from 20,000 to 80,000 nm3 on the backcoat layer surface, the magnetic layer has a center surface average surface roughness Ra, as measured by an atomic force microscope, ranging from 0.5 to 2.5 nm, and the hexagonal ferrite powder has an average plate diameter ranging from 10 to 40 nm.

Abstract: The present invention provides a magnetic latent image holding body in which the surface thereof has water repellency and a magnetic latent image is visualized by a liquid developer that contains a magnetic toner and an aqueous medium.

Abstract: In a discrete track medium and a patterned medium, a meniscus adsorptive force is reduced and writing into adjacent tracks is prevented. A magnetic layer in lands or patterns in the discrete track medium or the patterned medium is formed into a cylindrical shelly or spherical shelly shape with a uniform thickness. Moreover, a height of cylindrical shelly land or a height of spherical shelly land is changed between 5 nm and 30 nm according to radial positions. Thus, an effect is achieved for providing a magnetic recording medium and a magnetic disk apparatus which are excellent in realizing higher recording density and higher reliability.

Abstract: A magnetic recording tape includes an elongated substrate and a magnetic side. The magnetic side includes a support layer formed over the substrate and a magnetic recording layer formed over the support layer to define a magnetic recording surface opposite the substrate. The magnetic recording layer includes magnetic particles and a lubricant and supports a net uncompressed density of at least 30 MB/in2. The magnetic side has an extracted BET surface area of greater than 1.0 m2/g.

Abstract: A patterned media has a substrate, and a magnetic recording layer on the substrate including protruded magnetic patterns and a nonmagnetic material filled in between the protruded magnetic patterns. In the patterned media, a depth Db and a depth Da, which are defined that Db is a depth from a surface of the magnetic patterns to a surface of the nonmagnetic material filled in a first central part between the magnetic patterns adjacent to each other in a cross-track direction or a down-track direction, and Da is a depth from a surface of the magnetic patterns to a surface of the nonmagnetic material filled in a second central part in a portion surrounded by the magnetic patterns, have a relationship that the depth Da is greater than the depth Db.

Abstract: A magnetic recording tape includes an elongated substrate and a magnetic film coated over the elongated substrate, where the magnetic film includes a first magnetic recording layer. The first magnetic recording layer includes particles having a diameter that is between a factor from about 2 to 5 greater than a thickness of the first magnetic recording layer.

Abstract: A reduced-environmental-impact magnetic-sheet systems, processes and methods comprising flexible magnetic sheet material made with reduced-environmental-impact magnetic products from both pre-consumer and post-consumer recycled products.

Abstract: An aspect of the present invention relates to a magnetic recording medium comprising a magnetic layer comprising a ferromagnetic powder and a binder on a nonmagnetic support. A height of protrusions with a protrusion density of 0.002 protrusion/?m2 or lower on a surface of the magnetic layer as measured by AFM is 40 nm or lower; a density of protrusions that are 15 nm or higher in height on the surface of the magnetic layer as measured by AFM ranges from 0.01 to 0.18 protrusion/?m2; and the protrusions that are 15 nm or higher in height include protrusions formed of carbon black and protrusions formed of a substance with a Mohs' hardness exceeding 7, and an average height of the protrusions formed of carbon black is greater than an average height of the protrusions formed of the substance with a Mohs' hardness exceeding 7.

Abstract: An aspect of the present invention relates to a magnetic recording medium comprising a magnetic layer comprising a ferromagnetic powder and a binder on a nonmagnetic support, wherein the magnetic layer comprises compound A and/or a ring-opened product of compound A. Another aspect of the present invention relates to a magnetic recording medium comprising a nonmagnetic layer comprising a nonmagnetic powder and a binder and a magnetic layer comprising a ferromagnetic powder and a binder in this order on a nonmagnetic support, wherein the nonmagnetic layer comprises compound A and/or a ring-opened product of compound A. Compound A comprises a lactone ring substituted with at least one polar group selected from the group consisting of a hydroxyl group, a carboxyl group, and an amino group, or substituted with a substituent comprising the above polar group.

Abstract: The present invention provides a magnetic recording medium that excels in electromagnetic conversion characteristics. The magnetic recording medium has a 55 nm or less thickness magnetic layer formed on a major surface of an elongated nonmagnetic support by performing a vacuum thin film forming technique, the magnetic recording medium being slid over a magnetoresistive effect magnetic head or a giant magnetoresistive effect head to reproduce a signal, wherein an angle ? which is formed by a growth direction of magnetic particles in a columnar structure in a longitudinal cross-section of the magnetic layer and a normal to a longitudinal direction of the nonmagnetic support, satisfies the following relation: ?i??f?25°. where ?i is an angle of ? in an initial growth portion of the magnetic layer, and ?f is an angle of ? in a final growth portion of the magnetic layer.

Abstract: Disclosed are a magnetic tape capable of being wound regularly, and an apparatus and a method by which the tape is wound regularly. The tape-shaped recording medium, which includes a tape-shaped support body and a recording layer being formed on a surface of the support body, is curved laterally over its whole length and said tape-shaped recording medium being curved laterally over its whole length and having a surface arching across a whole width of the medium. Furthermore, it is preferable that a curved amount of the medium ranges from 0.5 mm/m to 4.0 mm/m and an arched amount of the medium ranges from 0.3 mm to 2.0 mm.

Abstract: Epitaxial ferroelectric and magnetic recording structures having graded lattice matching layers are disclosed. A single crystal material such as Si may be used as a substrate material upon which the graded lattice matching layers are deposited. The lattice matching layers may comprise metals and metal alloys, or may comprise oxides doped with selected elements or deposited under different oxygen pressures. A recording layer, such as ferroelectric lead zirconium titanate or a magnetic Fe/Pt multilayer structure, is deposited on the graded lattice matching layers.

Abstract: Provided is a magnetic recording medium exhibiting good electromagnetic characteristics in high-density recording The magnetic recording medium employed for magnetically recording signals with a track width equal to or less than 2.0 ?m and reproducing the magnetically recorded signals, wherein said magnetic recording medium comprises a magnetic layer comprising a hexagonal ferrite ferromagnetic powder and a binder or comprises a nonmagnetic layer comprise a nonmagnetic powder and a binder and a magnetic layer comprising a hexagonal ferrite ferromagnetic powder and a binder in this order on a nonmagnetic support. Said magnetic layer has a thickness equal to or less than 0.2 ?m, and said hexagonal ferrite ferromagnetic powder has an average plate diameter being 1/30 or less of the magnetically recorded track width as well as ½ or less of the thickness of the magnetic layer.

Abstract: The present invention relates to a magnetic recording medium comprising a magnetic layer comprising a ferromagnetic powder and a binder on one surface of a nonmagnetic support and a backcoat layer comprising a granular material and a binder on the other surface of the nonmagnetic support, wherein the backcoat layer has an average surface roughness ranging from 15 to 25 nm, as measured by an atomic force microscope, and a density of protrusions equal to or greater than 50 nm in height ranges from 1 to 50/mm2 on the backcoat layer surface, as measured by a three-dimensional surface roughness meter with a contact needle. The present invention further relates to a method of reproducing magnetic signals and a magnetic signal reproduction system.

Abstract: An aspect of the present invention relates to a magnetic recording medium comprising a magnetic layer comprising a ferromagnetic powder and a binder on one surface of a nonmagnetic support and a backcoat layer on the other surface of the nonmagnetic support, wherein a number of indentations equal to or greater than 20 nm in depth present on the magnetic layer surface is equal to or less than 100/10,000 ?m2, a sol component ratio in the magnetic layer is equal to or less than 5.0 percent, and the support has an amount of heat absorption based on enthalpy relaxation ranging from 0.5 J/g to 2.0 J/g, and a glass transition temperature Tg ranging from 110° C. to 140° C. The present invention further relates to a method of reproducing magnetic signals and magnetic signal reproduction system in which the magnetic recording medium is employed.

Abstract: A magnetic recording tape exhibits reduced magnetic flux modulation and improved signal-to-noise ratio. Providing a magnetic recording layer with a more uniform thickness can improve the magnetic flux modulation characteristic. For example, the magnetic recording tape may have a coercivity of greater than or equal to 2000 Oe with a magnetic flux modulation characteristic having a one sigma standard deviation of less than 0.06. In some cases, the magnetic flux modulation characteristic may have a one sigma standard deviation of less than 0.05, or even 0.04. Reduced magnetic flux modulation can support increased storage densities.

Abstract: A method for reproducing information recorded on a magnetic recording medium comprising, in the following order, a non-magnetic flexible support, a non-magnetic lower layer containing non-magnetic powder and a binder, and a magnetic layer containing ferromagnetic powder, a binder and an abrasive, the magnetic layer having an average thickness of 30 to 150 nm, a density of projections having a height of 10 nm or more of 2,000 to 10,000 per 100 ?m2 as measured by atomic force microscopy, and a scratch depth of 50 to 200 nm, the method comprising reading the magnetic recording medium with a magnetoresistive head having a magnetoresistive element, the magnetoresistive element being recessed 20 nm or less from a plane of contact with the magnetic recording medium.

Abstract: A magnetic recording medium is provided that comprises a non-magnetic support and, in order thereabove, a radiation-cured layer cured by exposing a layer comprising a radiation curing compound to radiation and a magnetic layer comprising a ferromagnetic powder dispersed in a binder, the radiation curing compound being a compound having a carbonate bond. There is also provided a radiation curing composition comprising a radiation curing compound having a carbonate bond.

Abstract: A leader tape comprising a support and a coating layer containing powder and a binder, wherein at least one surface of the leader tape has a center line average surface roughness (Ra) of from 10 to 60 nm, and depression hardness (DH) defined by the following equation (1) of from 60 to 140 kg/mm2 (0.588 to 1.372 GPa): DH=3.7926×10?2[Pmax/(Hmax)2](kg/mm2) ??(1) wherein Pmax is a maximum load and Hmax is a maximum displacement amount of an indenter.

Abstract: A magnetic tape having a small degree of deformation, high form stability and little decrease in reproduction output even after stock at a high humidity is provided. The magnetic tape includes a longitudinally extending nonmagnetic support, a magnetic layer formed by depositing a plurality of evaporated magnetic films, each having an oblique column-like structure, on a principal surface of the nonmagnetic support so that a growth direction of each of the evaporated magnetic films is opposite to the longitudinal direction, a protective layer formed on the magnetic layer, and a backcoating layer formed on the other surface of the nonmagnetic support, wherein a heat-shrinkage ratio in the longitudinal direction and a width direction is defined to be 0.50% or less and a humidity expansion coefficient at 25° C. is defined to be 1×10?6/% RH or less after stock at 100° C. and 5% RH for 30 minutes.

Abstract: A method for manufacturing a magnetic recording medium of the present invention includes a magnetic layer forming step in which a drying process is performed. The drying process includes: a pre-heating stage in which a magnetic coating film is heated until the surface temperature of the magnetic coating film stops rising and reaches a substantially constant temperature; a constant rate drying stage that is performed after the pre-heating stage in which the surface temperature of the magnetic coating film is held substantially constant; and a falling rate drying stage that is performed after the constant rate drying stage in which the surface temperature of the magnetic coating film is increased to be higher than the surface temperature during the constant rate drying stage to harden the magnetic coating film. The constant rate drying period in which the constant rate drying stage is performed is 0.2 seconds or more.

Abstract: A magnetic recording medium is provided that includes a non-magnetic support and, in order, above the non-magnetic support, a radiation-cured material layer cured by exposing a layer that includes a radiation curable compound to radiation, and a magnetic layer that includes a fine ferromagnetic powder and a binder, a compound having one or more ether groups and three or more radiation curable functional groups per molecule being employed as the radiation curable compound, and the number of magnetic layer surface micro projections having a height measured by atomic force microscopy (AFM) of 10 to 20 nm being 5 to 1,000 per 100 (?m)2. There is also provided the magnetic recording medium wherein it further includes a non-magnetic layer that includes a non-magnetic powder and a binder.

Abstract: A magnetic recording medium having a magnetic layer containing magnetic powder provided on a support is disclosed. The magnetic layer possesses a servo band in which a servo signal for controlling tracking of a magnetic head, and a data band on which a data is recorded. The servo signal is magnetized and recorded on the servo band, having been magnetized in one direction of the track direction thereof, in the direction other than the one direction. The thickness of the magnetic layer ranging from 10 to 180 ?m, and variation [standard deviation of Mrt] of the product [Mrt] of the residual magnetism by the thickness of the magnetic field being not more than 30%.

Abstract: A magnetic recording medium, which comprises: a nonmagnetic support; and a magnetic layer comprising a ferromagnetic powder and a binder, wherein an average surface roughness (Ra) at a center of a surface of the magnetic layer measured by using an atomic force microscope (AFM) is 2 nm or less, the maximum height (Rmax) thereof is 50 nm or less, and an arithmetic average of phase difference between a drive signal and a response signal of a probe measured with the atomic force microscope in a tapping mode is from 2 to 20°, and a method of producing the same.

Abstract: A magnetic recording medium including a nonmagnetic support and a magnetic layer containing ferromagnetic powder and a binder, wherein the magnetic layer contains diamond particles having an average particle size of from 20 to 100 nm, a volume per a particle of the ferromagnetic powder is from 100 to 8,000 nm3, and the support has an intrinsic viscosity of from 0.40 to 0.60 dl/g and is substantially free from particles.

Abstract: A magnetic tape having a lower non-magnetic layer containing non-magnetic powder and a binder, and an upper magnetic layer containing ferromagnetic powder and a binder, formed on a surface of a tape-form non-magnetic support. This magnetic tape has an intermediate binder layer, which is under the upper magnetic layer and has an average dry thickness of 10 to less than 50 nm. The average dry thickness of the upper magnetic layer is 5 to 100 nm, and the squareness ratio of the upper magnetic layer in the lengthwise direction is 0.8 or more. In this magnetic tape, the thickness of the magnetic layer and the fluctuation at the interface between the magnetic layer and the intermediate binder layer under the magnetic layer can be controlled. As a result, the PW50 value of a solitary waveform and modulation noise can be reduced. Thus, the magnetic tape shows excellent C/N characteristics.

Abstract: The present invention provides aligned fine particles that are aligned on a substrate. An organic coating film is bonded to surfaces of the fine particles is formed on the surfaces of the fine particles. An organic coating film bonded to a surface of the substrate is formed on the surface of the substrate. The organic coating film on the surfaces of the fine particles is bonded to the organic coating film on the surface of the substrate, whereby the fine particles are immobilized and aligned on the substrate. Thus, it is possible to align the fine particles of a nanometer scale in a specific direction. When fine magnetic particles are used, a magnetic recording medium for high recording density can be obtained, and a high-density magnetic recording/reproducing apparatus can be provided.

Abstract: A dual-layer magnetic recording medium including a non-magnetic substrate having a front side and a back side, a lower support layer formed over the front side and a magnetic upper recording layer formed over the lower layer, wherein the magnetic layer contains a volume concentration of at least about 35% of a magnetic metallic particulate pigment having a coercivity of at least about 2000 Oersteds (Oe), and a binder system for the pigment. The magnetic recording medium exhibits an orientation ratio greater than 2.0, a pulsewidth (PW50) value of less than about 500 nm, and a remanence-thickness product, Mr*t, of less than about 5.0 memu/cm2.

Abstract: A magnetic recording medium comprising: a support; and at least one magnetic layer containing a ferromagnetic powder and a binder, wherein a center line average roughness of the magnetic layer measured with a laser interferometer is from 1 to 3 nm, a skewness is 0 or more and less than 1.0, and a maximum difference of elevation of peak/valley is 50 nm or less.