Magnetic powder composite, antenna and electronic device, and method for producing the same

A magnetic powder composite, consisting of:

• a metal magnetic powder;
• and
• one or more elements selected from carboxylic acid or its anhydride, aromatic carboxylic acid ester, and a derivative thereof, and having a molecular weight of 500 or less and a carbon number of from 4 to 30, as a coating material,
• having a property that real part μ′ of permeability is 1.45 or more, tan δμ is 0.1 or less, tan δε is 0.05 or less at a measuring frequency of 2 GHz, when a magnetic powder composite is prepared by adding 5 parts by mass of one or more elements selected from the carboxylic acid or its anhydride, the aromatic carboxylic acid ester, and the derivative thereof to 100 parts by mass of the metal magnetic powder, and 30 vol % of the magnetic powder composite is contained in a thermoplastic resin in which the tan δε is 0.05 or less at 1 MHz specified in IEC 60250 or JIS C 2138:
• 2007,
• wherein
• the coating material is one or more elements selected from the group consisting of phthalic acid, phthalic anhydride, maleic acid, maleic anhydride, succinic acid, succinic anhydride, malonic acid, fumaric acid, glutaric acid, azelaic acid, sebacic acid, benzoic acid, dimethyl phthalate, and a derivative thereof, and
• a surface of the metal magnetic powder is coated with the coating material.