カ性アルカリ性無電解コバルト合金めっき浴の吸収特性と皮膜磁性

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The absorption spectra of electroless cobalt alloy plating baths and the magnetic properties of the plated films were investigated in order to find complexing agents suitable for plating baths for high-density recording media. In screening tests in which various complexing agents were introduced into caustic alkaline cobaltous solution, cobalt-citrate-aminoacetate complex was selected as the optimum mixed complex. Magnetic properties of the plated films varied greatly, depending on which complex-cobalt-citrate or cobalt-aminoacetate-become dominant in the mixed complex bath. Based on studies of the effects of bath factors on complex behavior and magnetic properties, a fundamental CoP bath composition was established such that a steady coercive force of 700Oe would be obtained. To increase the coercive force, the effect of adding zinc to the CoP bath was studied, and a maximum of 1700Oe was obtained. Read/write evaluation tests revealed that the output voltage and SNR of the CoZnP plated disk (Hc≅1200Oe) represented increases of about 30% and 5dB respectively over those of the CoP plated disk (Hc≅700Oe).
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