Patent application number | Description | Published |
20080213420 | Stamper and method of manufacturing the same - A stamper includes a stamper body including a nickel having a patterned surface by artificial drawing method, and a surface layer of a nickel-vanadium alloy having a vanadium content of less than 3 atomic percent formed on the patterned surface. | 09-04-2008 |
20080241595 | Magnetic recording medium - A magnetic recording medium includes a soft magnetic underlayer formed on a substrate, magnetic patterns made of a ferromagnetic material and provided separately on the soft magnetic underlayer, and a nonmagnetic layer including two sublayers or more of a same material and formed on the soft magnetic underlayer between the magnetic patterns. | 10-02-2008 |
20090042112 | Magnetic recording media - A magnetic recording media has a substrate and a magnetic recording layer containing ferromagnatic patterns on the substrate, the magnetic recording layer including a data zone to constitute a recording track and a servo zone to constitute a preamble region, an address region and a burst region, in which the address region and the burst region are separated by a part of the recording track. | 02-12-2009 |
20090176015 | ANTIREFLECTION STRUCTURE FORMATION METHOD AND ANTIREFLECTION STRUCTURE - The present invention provides such a formation method that an antireflection structure having excellent antireflection functions can be formed in a large area and at small cost. Further, the present invention also provides an antireflection structure formed by that method. In the formation method, a base layer and particles placed thereon are subjected to an etching process. The particles on the base layer serve as an etching mask in the process, and hence they are more durable against etching than the base layer. The etching rate ratio of the base layer to the particles is more than 1 but not more than 5. The etching process is stopped before the particles disappear. It is also possible to produce an antireflection structure by nanoimprinting method employing a stamper. The stamper is formed by use of a master plate produced according to the above formation method. | 07-09-2009 |
20090232928 | Method of Manufacturing Stamper, and Stamper - According to one embodiment, a method of manufacturing a stamper includes forming a conductive layer on a surface of a master having patterns of protrusions and recesses, forming an electroforming layer on the conductive layer, separating the electroforming layer and the conductive layer from the master to form a stamper to which the patterns of protrusions and recesses of the master are transferred, removing a resist left on the surface of the stamper, and etching the surface of the stamper with an acidic solution having a pH value of less than 3. | 09-17-2009 |
20090243152 | IMPRINTING METHOD AND STAMPER - According to one embodiment, an imprinting method includes applying a resist to a substrate, imprinting a stamper on which protruded patterns are formed against the resist applied to the substrate, forcing a distal end of a peeling wedge into a part between the substrate and the stamper, and introducing a gas between the substrate and the stamper to peel off the stamper from the substrate, in which a gap between the substrate and the stamper is made larger than a thickness of the resist at a part into which the distal end of the peeling wedge is forced. | 10-01-2009 |
20090246310 | RESIN IMPRINT STAMPER AND METHOD OF MANUFACTURING THE SAME - According to one embodiment, a resin imprint stamper formed of a resin material in an annular shape having a through-hole in a central part thereof, including a pattern area formed on a part of a surface thereof in which a plurality of lands and grooves are circumferentially arranged with a track pitch of 100 nm or less, and the pattern height of at most 100 nm, wherein no protrusion and step having a height exceeding 10 μm from a top surface of the pattern area are present in a region less than 3 mm from an end of the pattern area toward an inner periphery thereof. | 10-01-2009 |
20090277574 | PATTERN TRANSFER METHOD - According to one embodiment, a pattern transfer method includes spin-coating one surface of a medium substrate with photopolymer having viscosity of 10 cps or less to form an photopolymer layer having a thickness of 200 nm or less, bonding the one surface of the medium substrate and the patterned surface of the first transparent stamper under vacuum with the photopolymer layer sandwiched therebetween, applying an ultraviolet ray to the photopolymer layer through the first transparent stamper to cure the photopolymer layer, and peeling off the first transparent stamper to form the photopolymer layer to which patterns of protrusions and recesses are transferred on the one surface of the medium substrate to control a thickness of the photopolymer layer remaining in recesses to 100 nm or less. | 11-12-2009 |
20090280285 | STAMPER HOLDER, MOLDING DIE AND MOLDED SUBSTRATE FOR RECORDING MEDIUM - According to one embodiment, there is provided a stamper holder which holds a disk-shape metal stamper for molding having a center hole with an inner diameter of 17.5 mm or less and formed with patterns of protrusions and recesses for a recording medium on a surface in a state that the stamper holder is fixed to a first die having a center hole, in which the stamper holder has an approximately cylindrical shape so as to be inserted into the center hole of the first die and comprises a flange provided at one end configured to hold an inner peripheral portion of the stamper surface near the center hole, and an outer diameter of the flange is 17.6 mm or less. | 11-12-2009 |
20100155365 | STAMPER MANUFACTURING METHOD - According to one embodiment, when forming first, second, and third stampers by transferring three-dimensional patterns of a master, a height adjusting layer having a film thickness greater on the upper surface of a projection than on the bottom surface of a recess is formed between the second stamper and a second release layer, and the surface of the third stamper is etched with an acidic solution having a pH of less than 3. | 06-24-2010 |
20100159281 | MAGNETIC RECORDING MEDIUM MANUFACTURING METHOD - According to one embodiment, an ultraviolet-curable resin material to be used contains a monomer represented by formula (1) presented earlier, a resin stamper is used as a stamper, and the surface of a magnetic recording layer and the three-dimensional pattern surface of the resin stamper are contacted in a vacuum. | 06-24-2010 |
20100186877 | METHOD OF MANUFACTURING STAMPER - According to one embodiment, a method of manufacturing a stamper includes forming a first stamper from a master plate having lands and grooves through electroforming, forming a second stamper, a width of which is G | 07-29-2010 |
20100207302 | STAMPER MOLDING DIE AND METHOD FOR MOLDING STAMPER USING THE SAME - According to one embodiment, in a die for manufacturing a resin stamper, the following are defined the sizes of a resin injection hole and a cut punch receiving portion of a fixed-side template, areas in which a vacuum suction hole and an air-blow hole, respectively, are formed, the diameter of a cut punch on a moving-side template, and the taper angle of the peripheral portion of a cavity. | 08-19-2010 |
20100213642 | RESIN STAMPER MOLDING DIE AND METHOD FOR MANUFACTURING RESIN STAMPER USING THE SAME - According to one embodiment, the present invention provides a resin stamper injection molding die including a fixed side template having a metal stamper mounting surface mirror-ground in a random direction, a metal stamper having a front surface with recesses and protrusions and a back surface mirror-ground in a random direction, and a moving side template. The metal stamper has a surface roughness of 0 to 50 nm. The metal stamper mounting surface has a surface roughness of 0 to 1.0 nm, and has a coefficient of static friction of at most 0.20 with respect to the second main surface of the metal stamper. | 08-26-2010 |
20100233514 | RESIN STAMPER FOR PATTERN TRANSFER AND MAGNETIC RECORDING MEDIUM MANUFACTURING METHOD USING THE SAME - According to one embodiment, pattern transfer is performed using a combination of an ultraviolet-curable resin having a surface tension of 31 to 39 mN/m and a stamper having a critical surface tension of 31 mN/m or less. | 09-16-2010 |
20100237041 | MAGNETIC RECORDING MEDIUM MANUFACTURING METHOD - According to one embodiment, a cured first ultraviolet-curing resin material layer having a first three-dimensional pattern is formed on a first principal surface of a magnetic recording medium having a central hole. A cured second ultraviolet-curing resin material layer having a second three-dimensional pattern is formed on a second principal surface opposite to the first principal surface of the magnetic recording. | 09-23-2010 |
20100314253 | STAMPER MANUFACTURING METHOD - According to one embodiment, a three dimensional structure of a stamper is subject to etch by supplying a pulsed electric currentelectric current to the surface of the stamper. | 12-16-2010 |
20110049089 | ULTRAVIOLET-CURABLE RESIN MATERIAL FOR PATTERN TRANSFER AND MAGNETIC RECORDING MEDIUM MANUFACTURING METHOD USING THE SAME - According to one embodiment, an ultraviolet curing curable resin material for pattern transfer is provided. The resin contains isobornyl acrylate, an acrylate having a fluorene skeleton, a polyfunctional acrylate, and a polymerization initiator. | 03-03-2011 |
20110262580 | STAMPER AND METHOD OF MANUFACTURING THE SAME - According to one embodiment, a stamper manufacturing method comprises electroless plating by using a master includes a substrate, a conductive underlayer formed on the substrate and having catalytic activity, projecting patterns having no catalytic activity and partially formed on a surface of the conductive underlayer having catalytic activity, and regions in which the conductive underlayer having catalytic activity is exposed between the projecting patterns to deposite selectively an amorphous conductive layer between the projecting patterns and in the regions in which the conductive underlayer is exposed, and forming stamper projections, electroplating on the stamper projections includes the projecting patterns and the amorphous conductive layer by using the amorphous conductive layer and the conductive underlayer as electrodes to form a stamper main body made of a crystalline metal, and releasing a stamper includes the stamper projections and the stamper main body from the master. | 10-27-2011 |
20120000885 | STAMPER, METHOD OF MANUFACTURING THE STAMPER, AND MAGNETIC RECORDING MEDIUM MANUFACTURING METHOD USING THE STAMPER - According to one embodiment, a stamper manufacturing method includes forming a conductive material concentration gradient layer including the projections pattern, and a composition ratio of a buffering agent to a conductive material in the conductive material concentration gradient layer reducing in a thickness direction from a master side. | 01-05-2012 |
20120251655 | Method of Manufacturing Stamper, and Stamper - According to one embodiment, a stamper is described with a surface that comprises patterns of protrusions and recessed. The arithmetic average roughness Ra of the surface is 1 nanometer (nm) or more and 5 nm or less. | 10-04-2012 |
20130316088 | MAGNETIC RECORDING HEAD MANUFACTURING METHOD - According to one embodiment, a magnetic recording head manufacturing method characterized by includes processes of forming a main pole, forming, on the main pole, an insulating layer having a gap for forming a spin torque oscillator, forming a spin torque oscillator in the gap, and forming an auxiliary magnetic pole on the spin torque oscillator is provided. | 11-28-2013 |
20140078620 | MICROWAVE-ASSISTED MAGNETIC RECORDING HEAD, METHOD OF MANUFACTURING THE SAME, MAGNETIC HEAD ASSEMBLY USING THE SAME, AND MAGNETIC RECORDING/REPRODUCTION APPARATUS - According to one embodiment, a magnetic recording head manufacturing method includes forming a spin torque oscillator layer on a main magnetic pole layer, forming a mask on the spin torque oscillator layer, processing the spin torque oscillator layer by performing ion beam etching through the mask, and partially modifying the main magnetic pole layer through the mask. The partially modifying the main magnetic pole layer makes it possible to decrease the saturation flux density of the main magnetic pole layer in the modified portion, and form an unmodified main magnetic pole portion covered with the mask, and a modified portion around the main magnetic pole. | 03-20-2014 |
20140342576 | ULTRAVIOLET-CURABLE RESIN MATERIAL FOR PATTERN TRANSFER AND MAGNETIC RECORDING MEDIUM MANUFACTURING METHOD USING THE SAME - According to one embodiment, an ultraviolet curing curable resin material for pattern transfer is provided. The resin contains isobornyl acrylate, an acrylate having a fluorene skeleton, a polyfunctional acrylate, and a polymerization initiator. | 11-20-2014 |
20150029609 | SPIN VALVE ELEMENT, HARD DISK HEAD, AND MAGNETIC RECORDING AND REPRODUCING APPARATUS - A spin valve element according to an embodiment includes: a nonmagnetic base layer; a first terminal including a first magnetic layer connecting to a portion near one of opposing end faces of the nonmagnetic base layer; a second terminal including a second magnetic layer disposed and connecting to the nonmagnetic base layer so as to be at a distance from the first terminal; a third terminal including a third magnetic layer disposed and connecting to the nonmagnetic base layer so as to be at distances from the first and second terminals, the second terminal and the third terminal connecting to a current source that passes a sense current, and the first terminal and one of the second terminal and the third terminal connecting to a voltage detection unit that detects a voltage. | 01-29-2015 |
20150030886 | MAGNETORESISTIVE ELEMENT, MAGNETIC HEAD, AND MAGNETIC RECORDING AND REPRODUCING APPARATUS - A magnetoresistive element according to an embodiment includes: a nonmagnetic conductive layer; a first magnetic layer connected to the nonmagnetic conductive layer; a second magnetic layer connected to the nonmagnetic conductive layer so as to be distant from the first magnetic layer; a third magnetic layer connected to the nonmagnetic conductive layer so as be distant from the first magnetic layer; and a first to third magnetic electrodes connected to the first to third magnetic layers respectively; a voltage being applied between the third magnetic electrode and the first magnetic electrode through the third magnetic layer, the nonmagnetic conductive layer, and the first magnetic layer, and a current being caused to flow between the third electrode and the second magnetic electrode through the third magnetic layer, the nonmagnetic conductive layer, and the second magnetic layer, the nonmagnetic conductive layer decreasing in volume toward the one end face. | 01-29-2015 |