SOFT MAGNETIC MATERIAL AND METHOD FOR PRODUCING SAME

摘要

Disclosed are a soft magnetic material having an optimum electrical resistivity and a method for producing such a soft magnetic material. The soft magnetic material comprises a plurality of composite magnetic particles (30). Each of the composite magnetic particles (30) comprises a metal magnetic particle (10) and an insulating coating film (20) which covers the surface of the metal magnetic particle (10) and contains at least one substance selected from the group consisting of zirconium oxide, aluminum oxide and silicon oxide. The soft magnetic material has an electrical resistivity of not less than 3,000 muohmcm and not more than 50,000 muohmcm, and a magnetic permeability mu of not less than 2,000 and not more than 4,000. A method for producing such a soft magnetic material comprises a step for forming a shaped body by compressing a plurality of the composite magnetic particles (30) and a step for subjecting the shaped body to a first heat treatment at not less than 400˚C and not more than 900˚C.