Abstract: A manufacturing method of a magnetic recording medium includes follows: forming a magnetic recording layer on a substrate; forming an under layer and a metal release layer that forms an alloy with the under layer on the magnetic recording layer in this order and forming an alloyed release layer by alloying the under layer and the metal release layer; forming a mask layer on the alloyed release layer; forming a resist layer on the mask layer; providing a protrusion-recess pattern by patterning the resist layer; transferring the protrusion-recess pattern to the mask layer; transferring the protrusion-recess pattern to the alloyed release layer; transferring the protrusion-recess pattern to the magnetic recording layer; dissolving the alloyed release layer by using a stripping solution and removing a layer formed on the alloyed release layer from an upper side of the magnetic recording layer.

Abstract: An embodiment of the invention provides an apparatus that includes: a perpendicular magnetic recording medium including a substrate, a soft under layer above the substrate, a seed layer structure above the soft under layer, wherein the seed layer structure contains Ruthenium; and a magnetic recording layer above the seed layer structure.

Abstract: According to one embodiment, a magnetic recording medium includes a substrate, a soft magnetic layer, a multilayered underlayer formed on the soft magnetic layer, and a continuous film type magnetic recording layer formed on the multilayered underlayer. The multilayered underlayer includes a first underlayer made of copper and containing crystal grains having a (100)-oriented, face-centered cubic lattice structure, a second underlayer formed on the first underlayer and made of copper and nitrogen, and a third underlayer formed into islands on the second underlayer. The continuous film type magnetic recording layer contains at least one element selected from Fe and Co and at least one element selected from Pt and Pd, has the L10 structure, and mainly contains (001)-oriented magnetic crystal grains.

Abstract: There is provided a method of producing a magnetic recording medium having a magnetically separated magnetic recording pattern formed therein, without oxidizing or halogenating a surface of a magnetic layer, and also without contaminating the surface with dust and without complicating a production process, the method of producing a magnetic recording medium characterized by including, in this order: a step of forming a magnetic layer (2) on top of a non-magnetic substrate (1); a step of forming a mask layer (3) for forming a magnetic recording pattern on top of the magnetic layer (2); and a step of irradiating an ion beam (10) onto regions in the magnetic layer (2) which are not covered by the mask layer (3), removing an upper layer portion of the magnetic layer (2) at that regions (7), and reforming magnetic properties of a lower layer portion (8), wherein two or more types of positive ions having different masses are used for the ion beam (10), and an ion gun for forming the ion beam has a positive electrod

Abstract: Disclosed is a method of manufacturing a magnetic recording medium capable of effectively and reliably removing foreign materials on the surface of a magnetic recording medium, preventing a mask layer from remaining on the surface of the magnetic recording medium, and forming the pattern of a magnetic layer with high productivity. The method of manufacturing a magnetic recording medium includes: a step of forming a magnetic layer on a non-magnetic substrate; a step of forming a mask layer on the magnetic layer; a step of patterning the mask layer to form a mask pattern; a step of forming a magnetic recording pattern on the magnetic layer using the mask pattern; a step of burnishing the surface of the mask pattern with an abrasive; and a step of removing the mask pattern.

Abstract: An aspect of the present invention relates to a method of manufacturing a hexagonal ferrite magnetic powder comprising preparing a melt by melting a starting material mixture comprising a hexagonal ferrite-forming component and a glass-forming component; rapidly cooling the melt to obtain an amorphous material comprising 0.3 to 2.0 weight percent of carbon atoms; heating the amorphous material to a temperature range of 580 to 700° C. and maintaining the amorphous material within the temperature range to precipitate hexagonal ferrite magnetic particles; and collecting the hexagonal ferrite magnetic particles precipitated.

Abstract: The invention provides an optical information recording medium which is compatible with Blu-ray for recording a BCA signal by laser marking, in which the optical information recording medium has superior reading properties and is improved in recording properties and reliability in a BCA portion. A reflective film 7 includes Ag as a main component, and Nd, Gd, and Bi, in which Nd, Gd and Bi are effective for long-tem storage stability and inhibition of corrosion, and an addition of a small amount of Gd is effective for enhancing absorption of laser marking light. Accordingly, the invention can provide a highly-reliable optical information recording medium that exhibits a superior reading property of an information recording portion and a BCA portion, and that simultaneously exhibits a superior recording property of the BCA portion by selection of the composition at recording a BCA signal by laser marking.

Abstract: It is an object of the present invention to provide an optical recording medium containing a laminated structure of a first deformable material layer containing a phase-change material that absorbs light at a recording wavelength to generate heat and is subject to exothermic melting and deformation and a second deformable material layer containing a material which contains a silicon oxide (SiOx; 0<x?2) that transmits light and is subject to thermal deformation and alteration. After information is recorded, the thickness of the first deformable material layer is changed according to the recorded information making center of the recorded marks thicker than the ends and the second deformable material layer is deformed and altered corresponding to the concave-convex-pattern formed on the first deformable material layer based on the recorded information and when the information is reproduced, the first deformable material layer is altered from solid to molten state.

Abstract: Embodiments of the present invention help to provide a discrete track medium for realizing a high track density in a low price by adopting a configuration, in which filling of a non-magnetic material into a guard band portion and smoothing processing of a medium surface are not required. According to one embodiment, a perpendicular magnetic recording medium, on the non-magnetic substrate, includes at least: a soft magnetic underlayer; a first recording layer including a crystal grain having a magnetic property and a non-magnetic grain boundary having an oxide, as a main component, surrounding the crystal grain; a second recording layer containing a ferromagnetic metal as a main component and not containing an oxide; and at least one non-magnetic layer provided between the first recording layer and the second recording layer.