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Alumite disc using anordic oxidation

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9 Author(s)
Tsuya, N. ; Hosei University, Kajino Koganei, Tokyo, Japan ; Tokushima, T. ; Shiraki, M. ; Wakui, Y.
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Perpendicular magnetic alumite discs were obtained using an anodic oxidation method.The additional new pore widening process was effective to control the coercive force. The electro-deposited fine iron needles were single crystals and the growth direction was [110]. The recording characteristics of 3.5 and 5.25 inch rigid discs were evaluated. A recording density D50of 50 KBPI was attained for the disc with a media thickness 1.5 µm. The environmental test under an atmosphere of of 40 °C 90 % R. H. over 1000 hr affirmed the stability of the alumite disc with 250A SiO2overcoat.

Published in:

Magnetics, IEEE Transactions on  (Volume:22 ,  Issue: 5 )

Date of Publication:

Sep 1986

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