Hgst Netherlands, B.v.

Hitachi, Ltd.

Western Digital Technologies, Inc.

Hitachi Global Storage Technologies Netherlands B.v.

Joe Inagaki

Hiroyuki Matsumoto

Yotsuo Yahisa

Tomoo Yamamoto

Hidekazu Kashiwase

Yuzuru Hosoe

Akira Kato

Yoshibumi Matsuda

Masukazu Igarashi

Tatsuya Hinoue

Hiroshi Inaba

Mitsuhiro Shoda

Takao Yonekawa

Takuya Kojima

Das Sarbanoo

Kazuhiko Hasegawa

Enji Fujita

Hiroyuko Suzuki

A magnetic recording medium that includes a substrate, an insulation layer applied onto a surface of the substrate, and a magnetic layer applied onto the insulation layer. The insulation layer is made from a redox-corrosion-inhibiting material. In one embodiment, the insulation layer inhibits redox corrosion by inhibiting electron transfer through the insulation layer (e.g., inhibits electron transfer between the substrate and the magnetic layer).

Anti-corrosion insulation layer for magnetic recording medium

In one embodiment, a method for removing a resist includes irradiating, with an UV light having a wavelength of less than about 240 nm, a structure having a resist on a pattern surface in an atmosphere having oxygen. The resist is used as a mask as it remains above the pattern after the pattern has been transferred to a magnetic recording medium surface having a magnetic film thereon, and the irradiating is performed during production of the magnetic recording medium. In another embodiment, a method for forming a magnetic recording medium includes applying a resist to a surface of a magnetic film above a substrate, curing the resist by irradiating the resist with first UV light to form a pattern, transferring the pattern to the magnetic film using the pattern, and removing the resist by irradiating using second UV light having a shorter wavelength in an atmosphere including oxygen.

Method for removing resist and for producing a magnetic recording medium, and systems thereof

Embodiments of the present invention provide a perpendicular magnetic recording medium with less medium noise, excellent overwrite characteristics, and scratch resistance. According to one embodiment, when an Ar gas with addition of a micro-amount of oxygen is used upon forming an upper Ru intermediate layer, a micro-structure of a magnetic layer formed thereon can be formed in a state where no magnetic oxide region is segregated and the magnetic crystal grains are isolated. In this case, a gas pressure for forming the upper intermediate layer is set to 5 Pa or more and 12 Pa or less which is a region much higher compared with 0.5 Pa or more and 1 Pa for the lower Ru intermediate layer. Since writing by a head becomes difficult remarkably in the perpendicular magnetic medium having magnetic crystal grains promoted for isolation, a second magnetic layer for facilitating magnetization reversal by lowering the oxide concentration and somewhat strengthening coupling between particles only in the magnetic layer on the side of the surface is formed to a layer above the first magnetic layer as a main part.

Perpendicular magnetic recording medium and manufacturing method thereof

In one embodiment, a magnetic recording medium comprises an underlying film, a magnetic film and a protective film formed in this order on a substrate. The magnetic film is a cobalt-base alloy film containing chromium and has a plurality of magnetic layers stacked without interposition of any non-magnetic layer. The plural magnetic layers comprise first, second and third magnetic layers. The first magnetic layer is disposed between the underlying film and the second magnetic layer. The second magnetic layer is disposed between the first magnetic layer and the third magnetic layer. The third magnetic layer is disposed between the second magnetic layer and the protective film. The concentration of chromium contained in the first magnetic layer is lower than that of chromium contained in the second magnetic layer. The thickness of the first magnetic layer is smaller than that of the second magnetic layer. The magnetic layers which overlie the first magnetic layer further contain platinum and boron. The concentration of chromium contained in the third magnetic layer is lower than that of chromium contained in the second magnetic layer.

Magnetic recording medium having a cobalt-based alloy film for high density recording and magnetic storage device using same

A magnetic recording medium has a substrate made of a nonmetal nonmagnetic material whose coefficient of linear expansion lies within a range from 0.000013/deg to 0.0001/deg. A magnetic layer is formed on the substrate as a thin polycrystalline film or a thin amorphous film. The magnetic layer has Co as a main component, which exhibits a negative magnetostrictive constant so that its coercive force rises in the direction of compressive strain. The magnetic layer is subjected to an in-plane compressive strain from the substrate due to a difference between the coefficient of thermal expansion of the substrate and the magnetic layer so that high coercivity is obtained in the magnetic layer.

Magnetic recording medium

Growing community of inventors

Kanagawa, Japan

Joe Inagaki