METHOD FOR MANAGING CONCENTRATION OF PLATING LIQUID FOR MAGNETIC FILM

摘要

PROBLEM TO BE SOLVED: To provide a method for managing a concentration of a plating liquid for magnetic films whereby a Co ion concentration in the plating liquid can be correctly analyzed to enable at least a composition control for an alloy including Fe and Co. SOLUTION: A sample liquid of analyzing the Co ion concentration which is collected from a plating liquid is diluted, and a complexing agent which can be coordinated with Co ions is added to the diluted sample liquid. The concentration of Co ions in the sample liquid is analyzed from an absorbance of a peak wavelength of Co ions in a visible region of light.