摘要:
According to one embodiment, a magnetic recording medium includes magnetic patterns made of a ferromagnetic recording layer containing Co, and a nonmagnetic layer which separates the magnetic patterns and has a lower Co concentration than the magnetic patterns.
摘要:
A magnetic recording medium has magnetic patterns formed of a patterned ferromagnetic layer, and a non-magnetic layer including a component of the ferromagnetic layer and separating the magnetic patterns, in which a thickness “a” of the non-magnetic layer and a thickness “b” of the magnetic patterns satisfy a relationship of: a
摘要:
According to one embodiment, a method of manufacturing a discrete track recording medium includes forming protruded magnetic patterns on a substrate, and repeating processes of depositing a nonmagnetic material so as to be filled in recesses between the magnetic patterns and etching back the nonmagnetic material two or more times with rotating the substrate in a plane thereof by an angle less than one revolution.
摘要:
A magnetic recording media includes a toroidal substrate, a surface thereof is divided into a recording area located in a central part between an outer peripheral edge and an inner peripheral edge, edge areas located within 100 μm or more and 2,000 μm or less from the outer and inner peripheral edges, respectively, and adjacent areas located between the edge areas and the recording area, respectively, a magnetic film on the substrate, and a protective film on the magnetic film, in which the magnetic film is thinner in the edge areas than that in the adjacent areas, and at least a part of the protective film in the edge areas is thicker than that in the adjacent areas.
摘要:
According to one embodiment, a method of manufacturing a magnetic recording medium includes forming protruded magnetic patterns on a substrate, depositing a nonmagnetic material in recesses between the magnetic patterns and on the magnetic patterns, and etching back the nonmagnetic material using an oxygen-containing etching gas while reforming a surface of the nonmagnetic material.
摘要:
According to one embodiment, a method of manufacturing a discrete track recording medium includes forming protruded magnetic patterns on a substrate, and repeating processes of depositing a nonmagnetic material so as to be filled in recesses between the magnetic patterns and etching back the nonmagnetic material two or more times with rotating the substrate in a plane thereof by an angle less than one revolution.
摘要:
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.
摘要:
It is possible to improve the recording and reproducing S/N ratio, the reproduction signal intensity, and the degree of high density recording. There are provided a plurality of recording tracks formed on a substrate, each recording track being formed of a magnetic material, and non-recording sections formed on the substrate, each non-recording section separating adjacent recording tracks, each recording track including a plurality of recording sections and connecting sections for connecting the recording sections adjacent thereto in a track longitudinal direction, and each connecting section having a cross-sectional area in a track width direction that is smaller than a cross-sectional area in a track width direction of adjacent recording sections.
摘要:
According to one embodiment, a magnetic recording medium includes a substrate, and a magnetic recording layer formed on the substrate and having patterns of protrusions and recesses corresponding to a servo area and a recording area, in which the magnetic recording layer located in each of the recesses in the recording area has a thickness smaller than two thirds of a thickness of the magnetic recording layer corresponding to each of the protrusions, the magnetic recording layer remaining in each of the recesses in the recording area has a thickness of 1 nm or more, and a difference in height on a surface of the magnetic recording medium is 7 nm or less.
摘要:
According to one embodiment, patterns of protrusions and recesses includes a substrate including a conductive region on at least one major surface, and a projecting pattern layer formed on the conductive region on the major surface, and made of a microcrystalline material, a polycrystalline material, an amorphous material, or an oxide of the microcrystalline, polycrystalline, or amorphous material.