Wd Media (Singapore) Pte. Ltd.

Chikara Takasu

Teiichiro Umezawa

Yoshiaki Sonobe

A magnetic diskfor use in perpendicular magnetic recording has at least a magnetic recording layer on a substrate. The magnetic recording layer is composed of a ferromagnetic layerof a granular structure containing silicon (Si) or an oxide of silicon (Si) between crystal grains containing cobalt (Co), a stacked layerhaving a first layer containing cobalt (Co) or a Co alloy and a second layer containing palladium (Pd) or platinum (Pt), and a spacer layerinterposed between the ferromagnetic layerand the stacked layer. After forming the ferromagnetic layeron the substrateby sputtering in an argon gas atmosphere, the stacked layeris formed by sputtering in the argon gas atmosphere at a gas pressure lower than that used when forming the ferromagnetic layer

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Tokyo, Japan

Chikara Takasu