Seiji Okada
Fujitsu
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Publication
Featured researches published by Seiji Okada.
Journal of Applied Physics | 1987
M. Miyazaki; Itaru Shibata; Seiji Okada; K. Ito; Seiya Ogawa
A new protective film, Tb‐SiO2, was developed to increase the lifetime of TbFeCo magneto‐optical disks. Since Tb, a rare‐earth metal, is quite easily oxidizable, an efficient protective layer is essential to assure the stability of magneto‐optical disks. Given that vacuum‐deposited SiO2 film acts as an oxidation‐inducing layer, unlike SiO2 on a thermally oxidized silicon wafer, we invented a new protective film, Tb‐SiO2, in which Tb is intended to trap active oxygen in the vacuum‐deposited SiO2. The results were excellent and we estimate the lifetime of TbFeCo disks with Tb‐SiO2 as an underlayer and overlayer, at more than 20 years at 40 °C, 90% relative humidity. The properties and protection effects of Tb‐SiO2 are described.
Archive | 1983
Seiji Okada; Isao Watanabe; Norio Sawatari; Kazumasa Saito; Toshiaki Narusawa; Hirofumi Okuyama
Archive | 1981
Toshiaki Narisawa; Seiji Okada; Hirofumi Okuyama; Kazumasa Saito; Norio Saruwatari; Isao Watanabe
Archive | 1986
Itaru Shibata; Seiji Okada; Masahiro Miyazaki; Kazunori Naito; Mitsuru Hamada
Archive | 1981
Toshiaki Narusawa; Seiji Okada; Kiyohide Muramatsu; Teruo Yagishita; Hirofumi Okuyama
Archive | 1981
Toshiaki Narusawa; Seiji Okada; Kiyohide Muramatsu; Teruo Yagishita; Hirofumi Okuyama
Archive | 1978
Kiyohide Muramatsu; Toshiaki Narisawa; Seiji Okada; Hirofumi Okuyama; Teruo Yagishita
Archive | 1982
Teruo Yagishita; Seiji Okada; Toshiaki Narusawa; Hirofumi Okuyama
Archive | 1980
Toshiaki Narusawa; Seiji Okada; Kiyohide Muramatsu; Teruo Yagishita; Hirohumi Okuyama
Archive | 1983
Toshiaki Narusawa; Seiji Okada; Kiyohide Muramatsu; Teruo Yagishita; Hirofumi Okuyama
