Powder magnetic core

摘要

A powder magnetic core mainly comprises a soft magnetic powder which contains: 0.5 to 15% by mass of Si; 10% by mass or less of Al; and the balance of Fe and unavoidable impurities. The powder has an apparent density/true density falling within in a range of 0.4 to 0.55, and a volume percentage of the soft magnetic powder is 80% by volume or more. An initial permeability of the core at 100 kHz is 125 or more.