• Carbonyl Iron Powder (CIP) oxidation is an easy way to vary magnetic properties. • Oxidation time is an effective technique for controlling coating thickness of CIP. • Oxygen content of coated powders was measured and coating thickness calculated. • Higher coating thickness does not always lead to lower losses at high frequencies. • Optimum coating thickness depends majorly on intended application frequency range.
Mohan et al. (Mon,) studied this question.