Patent ID: 7422697

Claim:
A manufacturing method for a composite sintered magnetic material, the method comprising the steps of: measuring predetermined amounts of a metal powder selected from the group consisting of Fe, Fe—Si type, Fe—Ni type, Fe—Ni—Mo type, and Fe—Si—Al type, and at least one ferrite selected from the group consisting of Ni—Zn type, Mn—Zn type, and Mg—Zn type; mixing and dispersing the metal powder and the ferrite to form a mixture; and compacting the mixture under pressure into a compact of predetermined shape, sintering the compact in a non-oxidative atmosphere, and forming a diffusion layer around the metal powder, in which the diffusion layer bonds the metal powder and the ferrite, and heat treating the sintered compact in an oxygen containing atmosphere, in which the ferrite becomes at least 90% or more spinel phase; wherein the oxygen containing atmosphere is from 2% oxygen to 20% oxygen.