佳明磁鐵

A ferrite is a ceramic material made by mixing and firing large proportions iron(III) oxide (Fe₂O₃, rust) blended with small proportions of one or more additional metallic elements, such as barium, manganese, nickel, and zinc. Comparing with alloys and metals, the electrical resistivity of ferrite is much higher and and its dielectricity is higher. Ferrite provides high magnetic permeability in high frequency. Being made of mostly rusted iron (iron oxide), the cost of Ferrite compounds is low, and also have excellent corrosion resistance. They are very stable and difficult to demagnetize, and can be made with both high and low coercive forces.