Magnetic materials mainly refers to the transition elements iron, cobalt, nickel and its alloys, and other components directly or indirectly from magnetic material.
Magnetic materials and structures from, divided into "magnetic metals and alloys" and "ferrite magnetic materials," two categories, the ferrite magnetic material is divided into polycrystalline and single crystal structure of materials.
From the applications perspective, magnetic materials are divided into: soft magnetic materials, magnetic materials, magnetic materials moment, spin magnetic materials, and so kind. Soft magnetic materials, magnetic materials, magnetic recording - moments in magnetic materials have both metal ferrite materials; and spin magnetic materials and high-frequency soft magnetic materials can only be a ferrite material, because the metal in the high frequency and microwave frequency eddy current will have a huge effect, causing the metal magnetic material can not be used, and the resistivity of ferrite is very high, will effectively overcome this problem, are widely used.