Preferred Orientation of Cobalt Films Electrodeposited from Acidic Melts.

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  • 酸性浴からの電析コバルトの優先配向
  • サンセイヨク カラ ノ デンセキ コバルト ノ ユウセン ハイコウ

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Abstract

Cobalt was electrodeposited on copper substrate from sulfate, sulfate plus boric acid, sulfamate and chloride baths with a pH of 20-50. Deposits were prepared over a temperature range of 20-80°C. Crystalline orientation was determined by the X-ray diffraction method. The cobalt deposits from the sulfate plus boric acid and chloride baths exhibited strong (100) preferred orientation at the low overpotentials and strong (110) preferred orientation at the high overpotentials. This preferred orientation of the deposits from the sulfate plus boric acid and chloride baths is not consistent with the crystalline orientations predicted by Pangarov using the two dimensional platelets model. However, the deposits from the sulfate, sulfamate and part sulfate plus boric acid baths exhibited (002) preferred orientation over a wide range of plating conditions. The case in forming a direction of magnetization perpendicular to the substrate may possibly facilitate preparation of perpendicular magnetic recording media. The (002) preferred orientation affinity was related to the appearance of a shoulder in the polarization curves in the vicinity of the immersion potential and a subsequent abrupt increase in current, which are attributable to facile crystal formation and growth.

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