Silicon oxide-coated soft magnetic powder and method for producing the same

Disclosed is a silicon oxide-coated soft magnetic powder that has excellent insulating properties and can obtain a high dust density, and a method for producing the same. Silicon alkoxide is added to a slurry in which soft magnetic powder containing 20% by mass or more of iron is dispersed in a mixed solvent of water and organic matter containing 1% by mass or more and 40% by mass or less of water. By adding a silicon alkoxide hydrolysis catalyst and coating with silicon oxide, R = Si × 100 / (Si + M) (where Si and M are elements constituting Si and soft magnetic powder obtained by XPS measurement) The coating rate R defined by the molar fraction of the above) is 70% or more, the dust density is 4.0 g / cm 3 or more, has a high μ ′ in the high frequency band, and has a high insulating silicon oxide-coated soft magnetism. A powder is obtained. [Selection] Figure 1