Insulating magnetic metal particles and method for manufacturing insulating magnetic material

A method for manufacturing an insulating magnetic material, comprising:

• forming a first inorganic insulating layer made of an oxide on the surface of a magnetic metal particle containing at least one metal selected from the group consisting of Co, Fe, and Ni and having a diameter of 5 to 500 nm;
• forming a second inorganic insulating layer made of an oxide that produces a eutectic crystal by reacting together with the first inorganic insulating layer at the time of heating them on the first inorganic insulating layer thereby to produce an insulating magnetic metal particle, wherein a thickness ratio of the first and second inorganic insulating layers is set so that the first inorganic insulating layer remains on the surface of the magnetic metal particle after producing the eutectic crystal;
• molding the insulating magnetic metal particles to form a molded body;
• and
• heating the molded body to produce the eutectic crystal by reacting between the first and second insulating layers, while the first inorganic insulating layer remains on the surface of the magnetic metal particle.