Kabushiki Kaisha Toshiba

Hiroyuki Hyodo

Akira Kikitsu

Masatoshi Sakurai

Yoshiyuki Kamata

Takeshi Iwasaki

Kaori Kimura

Takayuki Yamamoto

Tomoko Taguchi

According to one embodiment, a magnetic recording medium is formed by performing gas ion irradiation by using a magnetism deactivating gas on a stack including a perpendicular magnetic recording layer, an Ru nonmagnetic underlayer containing a magnetism deactivating element selected from chromium, titanium, and silicon, and a nonmagnetic substrate. Before gas ion irradiation, the perpendicular magnetic recording layer contains platinum and at least one of iron and cobalt. Gas ion irradiation is performed using nitrogen gas alone or a gas mixture of nitrogen gas and at least one gas selected from the group consisting of helium, hydrogen, and BH.

Magnetic recording medium, method of manufacturing the same, and magnetic recording/reproduction apparatus

According to one embodiment, a perpendicular magnetic recording medium characterized by includes: a substrate; an undercoat layer formed on the substrate and made of a soft magnetic material; a recording layer formed on the undercoat layer and having an easy axis of magnetization in a direction that is approximately perpendicular to a surface of the perpendicular magnetic recording medium; and a protective layer which is formed on the recording layer and in which soft magnetic particles are mixed.

Perpendicular magnetic recording medium including soft-magnetic-particles-mixed protective layer on top of recording layer and magnetic disk device having the same

According to one embodiment, a method of manufacturing a patterned medium includes forming an implantation depth-adjusting layer above a magnetic recording layer, the magnetic recording layer being made of a material that is deactivated when implanted with a chemical species, and the implantation depth-adjusting layer being made of a material that is etched when irradiated with an ion beam of the chemical species and irradiating the implantation depth-adjusting layer with the ion beam to implant the chemical species into a part of the magnetic recording layer through the implantation depth-adjusting layer while etching the implantation depth-adjusting layer by an action of the ion beam to decrease a thickness of the implantation depth-adjusting layer.

Method of manufacturing magnetic recording medium and magnetic recording apparatus

According to one embodiment, a patterned magnetic recording media has a magnetic recording layer and a protective layer formed on a substrate, in which the magnetic recording layer including a magnetic material patterned in tracks and a nonmagnetic material filled in between the tracks in a data area, and has a recessed portion formed in an area within 1 mm from an outer media end and extending to the media end. The recessed portion being formed 1 to 50 nm deeper than the data area.

Patterned magnetic recording media, stamper for manufacture of patterned magnetic recording media, method of manufacturing patterned magnetic recording media, and magnetic recording/reproduction apparatus

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Hino, Japan

Hiroyuki Hyodo