Abstract: A magnetic media disk has a substrate; a recording magnetic media on the substrate; and an overcoat on the recording magnetic media, the overcoat comprising a Si-based layer on the recording magnetic media, and a Ti-based layer on the Si-based layer.

Abstract: A magnetic recording apparatus includes a magnetic recording medium that is provided with a first magnetic layer with magneto crystalline anisotropy energy, a second magnetic layer with magneto crystalline anisotropy energy that is smaller than the magneto crystalline anisotropy energy of the first magnetic layer, and a nonmagnetic metal layer that is positioned between the first magnetic layer and the second magnetic layer and that provides coupling force between the first magnetic layer and the second magnetic layer; and a magnetic head that includes a main pole that applies a recording magnetic field in a direction perpendicular to a film surface of the magnetic recording medium to the magnetic recording medium, and an alternate current (AC) magnetic field generator that applies an AC magnetic field with a frequency of 1-40 GHz to the magnetic recording medium.

Abstract: A method of manufacturing a magnetic recording medium having a magnetically separated magnetic recording pattern is provided, in which the surface of a magnetic layer is not oxidized or halogenated, the surface is not contaminated with dust, and the manufacturing process is not complex. The method of manufacturing a magnetic recording medium having a magnetically separated magnetic recording pattern includes forming a magnetic layer on a nonmagnetic substrate, forming a mask layer made of carbon to form the magnetic recording pattern on the magnetic layer, forming cobalt carbide as a nonmagnetic material in the magnetic layer by irradiating a region of the magnetic layer not covered by the mask layer with ion beams including carbon hydride ions, and removing the mask layer in this order.

Abstract: A magnetic recording medium includes a magnetic recording layer. The magnetic recording layer includes a first magnetic layer formed as a pattern portion that is a data portion in a servo region, a second magnetic layer formed as a non-pattern portion that is magnetized to be antiparallel with a magnetization direction of the first magnetic layer and of which coercive force is lower than a coercive force of the first magnetic layer, and a nonmagnetic layer formed between the first magnetic layer and the second magnetic layer.

Abstract: A disk drive device has a hub so configured as to place and hold recording disks. Where the non-rotating eigenfrequency of resonance in a secondary rocking mode with the recording disks placed on the hub is defined to be F0 (Hz) and the rotational frequency of the hub is defined to be N (Hz), an extending part of the hub and a second cylinder part of the hub are formed such that the radial dimension of the extending part is smaller than the axial dimension of the second external cylinder part to satisfy to a relation F0>N·(3·P+2).

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: According to one embodiment, a multilayered nonmagnetic underlayer is provided under a perpendicular magnetic recording layer, which has a structure in which a nonmagnetic template layer consisting of ruthenium and silicon is formed between a first nonmagnetic underlayer consisting of one of ruthenium and a first ruthenium alloy sputtered in an inert gas ambient, and a second nonmagnetic underlayer consisting of one of ruthenium and a second ruthenium alloy sputtered in an inert gas ambient at a pressure higher than that when sputtering the first nonmagnetic underlayer.

Abstract: A manufacturing method of a magnetic recording medium, the magnetic recording medium having a structure where plural magnetic recording areas and isolation areas in a magnetic recording layer are formed on a non-magnetic substrate, the isolation areas being configured to magnetically isolate the magnetic recording areas, the manufacturing method includes a step of forming the magnetic layer on the non-magnetic substrate, the magnetic layer being made of a hard magnetic material having a magnetic coercive force whereby magnetic recording is impossible; and a step of performing ion implantation partially at positions corresponding to the plural magnetic recording areas of the magnetic layer so that the magnetic recording areas are formed by reducing the magnetic coercive force in the positions of the ion implantation to a magnetic-recordable magnetic coercive force, and allowing the isolation areas to maintain the magnetic coercive force whereby magnetic recording is impossible.

Abstract: Aspects of the present embodiments are related to manufacturing methods of magnetic recording media. The manufacturing method of a magnetic recording medium includes a step of stacking a soft magnetic backing layer, an intermediate layer, a first recording layer having a perpendicular magnetic anisotropy, an exchange coupling force control layer including ruthenium, and a second recording layer having a perpendicular magnetic anisotropy on a substrate in order. A gas pressure of a process gas when the exchange coupling force control layer is being formed is higher than the gas pressure of the process gas when being normally used.

Abstract: Embodiments of the present invention provide a perpendicular magnetic recording medium suitable for high density recording. According to one embodiment, a magnetic recording layer comprises four layers in which a first magnetic layer, a magnetic coupling layer, a second magnetic layer, and a third magnetic layer are formed above a substrate. The first magnetic layer and the second magnetic layer are perpendicular magnetization films containing an oxide, and ferromagnetically coupled with each other by way of the magnetic coupling layer, and they are, more preferably, a Co alloy layer containing an oxide. The third magnetic layer is ferromagnetically coupled with the second magnetic layer. The concentration of the oxide contained in the third magnetic layer is lower than the concentration of the oxide in the second recording layer, or the third magnetic layer does not contain the oxide.

Abstract: A magnetic recording device includes: a laminated body including: a first ferromagnetic layer with a magnetization substantially fixed in a first direction; a second ferromagnetic layer with a variable magnetization direction; a first nonmagnetic layer disposed between the first ferromagnetic layer and the second ferromagnetic layer; and a third ferromagnetic layer with a variable magnetization direction. The magnetization direction of the second ferromagnetic layer is determinable in response to the orientation of a current, by allowing electrons spin-polarized by passing a current in a direction generally perpendicular to the film plane of the layers of the laminated body to act on the second ferromagnetic layer, and by allowing a magnetic field generated by precession of the magnetization of the third ferromagnetic layer to act on the second ferromagnetic layer.