Patent application number | Description | Published |
20090101624 | Method for manufacturing magnetic recording medium - A method for efficiently manufacturing a magnetic recording medium by filling concave portions of a concavo-convex patterned recording layer with a filler to provide sufficient surface flatness is provided. A cladding is etched by a dry etching method in which an etch rate of the cladding is equal to or higher than an etch rate of the filler. Then, by dry etching method in which an etch rate of the filler is higher than that of the cladding, the filler is etched so that a top surface of a diaphragm over a recording element (or a top surface of the recording element in absence of the diaphragm) is exposed, and the cladding remains over the concave portion of the concavo-convex pattern of the recording layer. | 04-23-2009 |
20090168244 | Magnetic recording medium, magnetic recording and reproducing apparatus, and method for manufacturing magnetic recording medium - The magnetic recording medium includes: a substrate; a recording layer formed in a predetermined concavo-convex pattern over the substrate, the concavo-convex pattern including a convex portion that serves as a recording element; and a filling portion that fills a concave portion between the recording elements. The filling portion comprises a metal-based main filling material and nitrogen. Nitrogen is unevenly distributed in the filling portion such that the ratio of the number of nitrogen atoms to the total number of atoms of the main filling material and nitrogen atoms is greater in the upper surface portion of the filling portion than in the lower portion thereof. | 07-02-2009 |
20090242508 | Method for manufacturing magnetic recording medium - A filling material different from a first mask layer (temporary coating material) is deposited over a workpiece to fill concave portions. At least part of excess portions of the filling material is removed by a dry etching method such that at least part of the side surfaces of the first mask layer over recording elements are exposed. Then, the first mask layer is removed by a dry etching method which uses a reactive gas having the property of chemically reacting with and removing both the filling material and the first mask layer as a processing gas and in which an etching rate for the first mask layer is higher than that for the filling material, and the etching rate for the filling material is higher than that for a recording layer (a lower layer that is in contact with a lower surface of the first mask layer over recording elements). | 10-01-2009 |
20090286045 | METHOD OF MANUFACTURING STAMPER, METHOD OF MANUFACTURING RESIN MOLDED ARTICLE, AND STAMPER - A stamper manufacturing method comprises: forming a stamper body so as to have a concave/convex pattern on one surface and a crystalline structure on at least a side toward the other surface; forming a layer having an amorphous structure on the other surface side of the stamper body; and polishing a surface of the layer having the amorphous structure. A resin molded article manufacturing method includes an injection molding process using the stamper as a prototype so as to transfer the concave/convex pattern of the stamper to a resin material. A stamper comprises a stamper body which is formed so as to have a concave/convex pattern on one surface and have a crystalline structure on at least a side toward the other surface. In the stamper, a layer having an amorphous structure and a surface of which is polished is formed on the other surface side of the stamper body. | 11-19-2009 |
20090310255 | Magnetic recording medium and magnetic recording and reproducing apparatus - A highly reliable magnetic recording medium is provided which has a recording layer formed in a concavo-convex pattern and wherein the recording layer is unlikely to cause a change in magnetic properties. The magnetic recording medium includes a substrate, a recording layer formed in a predetermined concavo-convex pattern over the substrate, convex portions of the concavo-convex pattern serving as recording elements; and a filler portion filling a concave portion between the recording elements. The filler portion comprises a metal-based main filler material and oxygen. Oxygen is unevenly distributed in the filler portion so that the ratio of the number of oxygen atoms to the total of the number of atoms of the main filler material and the number of oxygen atoms is greater in an upper surface portion of the filler portion than in a lower portion of the filler portion. | 12-17-2009 |
20100202256 | Near-field light generating device including surface plasmon generating element - A near-field light generating device includes: a base having a top surface; a waveguide that allows laser light to propagate therethrough and is disposed above the top surface of the base; and a surface plasmon generating element that is disposed above the top surface of the base so as to adjoin the waveguide in a direction parallel to the top surface of the base. The waveguide has a side surface that faces the surface plasmon generating element. The surface plasmon generating element includes: a coupling part that is opposed to a part of the side surface of the waveguide with spacing therebetween and causes excitation of a surface plasmon by coupling with evanescent light occurring from the part of the side surface; and a near-field light generating part that generates near-field light based on the surface plasmon excited at the coupling part. | 08-12-2010 |
20110024388 | METHOD FOR MANUFACTURING MAGNETIC RECORDING MEDIUM - A method for manufacturing a magnetic recording medium is provided which can sufficiently reduce variations in surface roughness even in the simultaneous presence of a region of a relatively wide concave and convex portion and a region of a relatively narrow concave and convex portion in the recording layer. The method includes the steps of etching a recording layer based on a (first) mask layer to process it in a concavo-convex pattern, and depositing a filler over the recording layer and the mask layer to fill a concave portion with the filler. In between those steps, provided is the step of removing part of the first mask layer over a recording element (a convex portion of the recording layer) by dry etching in which an etching rate for the mask layer is higher than that for the recording layer so that the mask layer remains over the recording element. | 02-03-2011 |
20110181984 | MAGNETIC RECORDING MEDIUM, MAGNETIC RECORDING AND REPRODUCING APPARATUS, AND METHOD FOR MANUFACTURING MAGNETIC RECORDING MEDIUM - The recording layer is made of both magnetic particles containing Co, Cr, and Pt and a nonmagnetic material containing Cr present among the magnetic particles. The recording element has an uneven Cr distribution such that the ratio of the number of Cr atoms that constitute the recording element to the total number of Co, Cr, and Pt atoms that constitute the recording element is less at the sidewall portion of the recording element than at the center portion of the recording element. The relationships given by Expressions (I) and (II) below are satisfied; | 07-28-2011 |