Tokyo Shibaura Denki Kabushiki Kaisha

Hgst Netherlands, B.v.

Takuya Kojima

Tomoo Yamamoto

Joe Inagaki

Yoshimitsu Aramaki

Das Sarbanoo

Shoichi Miyashiro

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 a display device, a picture element capacitor is connected to a light emitting element provided in each picture element. This picture element capacitor is connected to a signal source through a switching element. The picture element is charged, by the signal source, with a signal charge corresponding to an input signal, through the closure of the switching element during some period of time. The signal charge charged into the picture element capacitor is supplied to the light emitting element, whereby the element emits lights.

Display device

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Kanagawa, Japan

Takuya Kojima