Abstract: A method and apparatus of a spin-type magnetoresistance sensor having a free and pinned magnetic layer stacked with a non-magnetic interposed layer are disclosed.

Abstract: A magnetic recording medium comprising, in this order, a nonmagnetic support, a lower layer containing nonmagnetic powder and a binder, and a magnetic layer containing ferromagnetic powder and a binder, wherein N/Fe of the magnetic layer measured with a fluorescent X-ray apparatus is from 0.5 to 1.9 wt %, and a number of concavities having a depth of 5 to 10 nm on a surface of the magnetic layer is from 20 to 100/100 ?m2.

Abstract: The fabrication of the overcoat layer starts with a low energy ion beam to avoid magnetic layer implantation problems, followed by higher deposition energies where the higher energy atoms are implanted into the previously formed lower energy overcoat layer, rather than the magnetic layer. The energy gradient ion beam deposition process therefore results in a thin overcoat layer that is denser than a comparable layer formed by low energy magnetron sputtering, and which overcoat layer provides good mechanical and corrosion protection to the magnetic layer, without degrading the magnetic properties of the magnetic layer.

Abstract: Data storage tape includes a substrate having a first side and a second side opposite the first side, a recording layer disposed on the first side of the substrate, and a coating disposed on the second side of the substrate. A surface of the coating has a pattern formed therein such that the pattern communicates with at least one of a first edge and a second edge of the data storage tape.

Abstract: A perfluoropolyether hard disk lubricant having a UV curable functional end group that may be UV cured at a rapid rate with a Xenon excimer lamp. The perfluoropolyether preferably has at least one UV curable functional end group. In one embodiment, the UV curable end group comprises an acrylate.

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.

Abstract: A magnetic recording medium is prepared by coating a dispersion of non-magnetic powder and ferromagnetic powder in a binder and a dispersion of ferromagnetic powder in a binder to a non-magnetic substrate by a wet-on-wet coating technique to form subordinate and magnetic layers on the substrate, and subjecting the layers to magnetic field orientation. The subordinate layer has a Br of 80 to 400 gauss, and the magnetic layer has a thickness of 0.1 to 0.4 ?m. The medium has surface smoothness and good electromagnetic characteristics and lends itself to recording and reproducing signals having a minimum wavelength of 0.2 to 0.7 ?m.

Abstract: A magnetic recording medium comprising a backcoating layer, a support, and a magnetic layer containing ferromagnetic powder, the backcoating layer having 800 to 1500 projections of 50 nm or more and less than 75 nm in height per 6400 ?m2 and 600 or less projections of 75 nm or more in height per 6400 ?m2.

Abstract: Provided is a magnetic recording medium that exhibits excellent electromagnetic characteristics especially in recording and reproducing systems using an MR head, as well as has excellent long-term preservation property. The magnetic recording medium comprises a lower layer comprising a nonmagnetic powder or a ferromagnetic powder and a binder and at least one magnetic layer thereover comprising a ferromagnetic powder and a binder on a support.

Abstract: Magnetic recording media having a protective carbon overcoat adapted to protect the magnetic recording layer from surface contact events and corrosion. The carbon overcoat includes at least two layers. A first layer is adapted to protect the magnetic recording layer from surface contact events and corrosion. The second layer is disposed on the first layer and is adapted to enhance the bonding of a lubricant to the carbon overcoat and to minimize head degradation. The magnetic recording media of the present invention advantageously enables the use of thin carbon overcoats, enhancing areal density, while maintaining good tribological properties.

Abstract: To provide a magnetic recording medium which undergoes little effect of thermal fluctuation and provides a high short wavelength output and C/N ratio when reproduction is conducted using MR head, the magnetic recording medium includes a non-magnetic layer having a non-magnetic powder dispersed in a binder provided on a support and a magnetic layer having a ferromagnetic powder dispersed in a binder provided on the non-magnetic layer, wherein the ferromagnetic powder comprises a hexagonal ferrite magnetic powder having an average diameter of from 10 to 35 nm and a coercive force of from 135 to 400 kA/m; the magnetic layer has a coercive force of from 135 to 440 kA/m; and a product of an anisotropic magnetic field of the magnetic layer and an average particle volume of the hexagonal ferrite magnetic powder is from 1.2×106 to 2.4×106 kA/m·nm3.

Abstract: A near infrared screening film which consists of a biaxially oriented film made from a polyester containing a near infrared light absorber having a weight reduction start temperature of at least 280° C. and which has a haze value of 5% or less and a total transmittance for visible lights having a wavelength of 400 to 650 nm of 40% or more and which is exemplified by having optical properties at visible and near infrared ranges which satisfy the following expressions (1) to (4): 1<T(850)<20??(1) 1<T(950)<20??(2) ?10<T(620)?T(540)<10??(3) ?10<T(450)?T(540)<10??(4) wherein T(450), T(540), T(620), T(850) and T(950) are light transmittances at wavelengths of 450 nm, 540 nm, 620 nm, 850 nm and 950 nm, respectively.

Abstract: The present invention relates to a magnetic disk substrate formed of a thermoplastic resin and a magnetic disk comprising a magnetic recording layer formed on the magnetic disk substrate. In the magnetic disk substrate of the invention, the amount of gases generated therefrom upon held at 90° C. for 1 hour is 100 ?g/cm2 or less, so that when scanned by a floating head, errors on recording and reading of information are remarkably reduced. Thus, the magnetic disk substrate can provide a magnetic disk having improved scan capability. The present invention also provides a process for manufacturing such a magnetic disk.

Abstract: In one aspect, the magnetic recording medium comprises a magnetic layer comprising a ferromagnetic powder and a binder and said binder comprises polyurethane resin having a glass transition temperature of 100 to 200° C. In a second aspect, the magnetic recording medium comprises 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 and at least the binder comprised in said magnetic layer comprises polyurethane resin having a glass transition temperature of 100 to 200° C. In both aspects, said magnetic layer has a thickness equal to or less than 0.15 ?m, said ferromagnetic powder has a mean major axis length or a mean plate diameter of 60 nm or less, and said magnetic layer has a coercivity of 159 to 239 kA/m in a longitudinal or in-plane direction.

Abstract: The coating-type magnetic recording medium has a non-magnetic layer mainly composed of a non-magnetic powder and binder, and a magnetic layer mainly composed of a ferromagnetic powder and a binder, which are stacked in this order on a non-magnetic substrate, wherein dispersion ?L/L of long-axis length of all ferromagnetic powder particles contained in the magnetic layer falls in a range of ?L/L?±10%, where L is an average long-axis length and ?L is a standard deviation thereof, and dispersion ?W/W of short-axis length of all ferromagnetic powders contained in the magnetic layer falls in a range of ?W/W?±15%, where W is an average short-axis length and ?W is a standard deviation thereof. The average long-axis length L is typically adjusted within the range of 0.08 ?m and 0.12 ?m, and the Switching Field Distribution (SFD) of the medium is adjusted to 0.25 or less.

Abstract: The present invention provides a magnetic recording medium which can record both digital and analog signals by, e.g., VTR for commercial use and improve their electromagnetic conversion characteristics. A magnetic recording medium comprises a nonmagnetic support, and first and second magnetic layers comprised respectively of magnetic powder (A) and (B), wherein the first and second magnetic layers are formed on the nonmagnetic support in this order, wherein the magnetic powder (A) and (B) have the following characteristics: saturation magnetization ?s(A) ?80 to 150 Am2/kg; coercive force Hc(A) ?90 to 180 kA/m, saturation magnetization ?s(B) 100 to 200 Am2/kg, coercive force Hc(B) 100 to 200 kA/m, wherein the first and second magnetic layers satisfy the below relationships and have thickness T(A) and T(B) in the below ranges: ?s(A)/?s(B)?1.0, Hc(A)/Hc(B)?1.0, 1.0 ?m?T(A)?4.0 ?m, 0.01 ?m?T(B)?0.5 ?m.

Abstract: A magnetic recording medium which includes a substrate having a front side and a backside, a longitudinal direction and a cross-web direction, with a particulate/binder or thin film magnetic layer formed over the front side of the substrate, wherein the magnetic medium has a cross-web dimensional difference from the magnetic recording head used therewith of less than 900 ?m/meter over a 35° C. temperature range, and over a 70% relative humidity range. Preferred substrates include thin metals, metal alloys, and thin glass films.

Abstract: The present invention pertains to a magnetic laminate that may be used in the creation of an advertising, novelty or remembrance item. The laminated construction provides for containment of the coercive rings so as to substantially eliminate the migration of forces between successive sheets in a stack. The sheets may have one or more removable elements that release cleanly from the configuration through the use of a curable, frangible coating that creates a frangible bond and that does not impede the processing or handling of the sheets.

Abstract: A system and method for improving the durability and reliability of recording media used in hard drives is disclosed. A protective overcoat made of diamond like carbon (DLC) is first deposited over a magnetic layer. A lubricant layer, typically containing Moresco lubricant or a perfluoropolyether (PFPE), is then deposited over the protective overcoat. Finally, the lubricant layer is exposed to ultraviolet (UV) light for a period of time.

Abstract: A magnetic recording medium which includes a non-magnetic substrate having a front side and a backside, a longitudinal direction and a crossweb direction, with a particulate/binder magnetic layer formed over the front side of the substrate, wherein the magnetic medium has a cross web dimensional difference from the magnetic recording head used therewith of less than 900 microns/meter over a 35 degree temperature range, and over a 70% relative humidity range. In one embodiment, the substrate is a polymeric film which has been subjected to a biaxial tensilization process, thus having a lower coefficient of hygroscopic expansion and coefficient of thermal expansion than an otherwise identical film substrate which has not been biaxially tensilized. The magnetic recording medium formed using such a tensilized substrate has a Wyko Ra smoothness of less than about 10 nm, and a coefficient of thermal expansion from about 5 ppm/C to about 10 ppm/C.