Powder magnetic core

摘要

PROBLEM TO BE SOLVED: To provide a dust core having low magnetic loss and high magnetic permeability. A dust core 100 includes a plurality of soft magnetic iron-based particles 10, a coating layer 20 provided on the surface of each soft magnetic iron-based particle 10, and an intervening layer provided between the coating layers 20. 40 and nanopowder 30 arranged between soft magnetic iron-based particles 10. The coating layer 20 is a layer of a compound containing Fe, Si, O, B, and N, and the nanopowder 30 is selected from the group consisting of Fe, Si, Zr, Co, Al, Mg, Mn, and Ni. It is a powder of a compound containing at least one element, O, and N. [Selection diagram] Fig. 1