COMPOSITE MAGNETIC MATERIAL PREPARED BY COMPRESSION FORMING OF FERRITE−COATED METAL PARTICLES AND METHOD FOR PREPARATION THEREOF

摘要

A first composite magnetic material, characterized in that it comprises fine ferromagnetic metal or intermetallic compound particles and, formed on the surface thereof, a ferrite layer covering the particle and the ferromagnetic particles and the ferrite layer have been subjected to compression forming; and a second composite magnetic material, characterized in that it comprises the above ferromagnetic metal or intermetallic compound particles covered with a ferrite layer and ultra−fine ferrite particles and the two have been mixed and subjected to compression forming. The above ferrite layer covering is preferably formed by the ferrite plating, in particular, with the aid of ultrasonic excitation. The ferrite layer preferably has an amorphous ferrite phase as a primary phase. The composite magnetic material has ferromagnetic metal or intermetallic compound particles which are electrically insulated from one another and thus exhibits a high saturation magnetization, high permeability and also high insulating property.