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Abstract

A silicon oxide-coated soft magnetic powder has excellent insulating property and provides a high powder compact density. In making the powder, silicon alkoxide is added to a slurry containing soft magnetic powder containing iron in an amount of 20% by mass or more dispersed in a mixed solvent of water and an organic solvent containing water in an amount of 1% by mass or more and 40% by mass or less. A hydrolysis catalyst for the silicon alkoxide is then added to perform silicon oxide coating. The coated magnetic powder has a coverage factor R of 70% or more defined by R=Si×100/(Si+M) (wherein Si and M represent molar fractions of Si and elements constituting the soft magnetic powder obtained by an XPS measurement), a powder compact density of 4.0 g/cm³ or more, and high μ′ at high frequency and high insulating property.

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First Claim