Soft ferrite is a kind of nonmetallic magnetic materials, which is made up of ferric oxide and other metallic oxides such as MnO, NiO and ZnO. It has a high resistivity so it's eddy-current loss at high frequency is much less than that of metallic magnetic materials. Soft ferrite cores are widely used in computers, tele-communication equipment, consumer's electronics such as TV, VTR and audio sets, industrial automation equipment and various kinds of electronic instruments, etc.