The magnetic material has a magnetically ordered ferromagnetic substance, and broadly includes a weak magnetic and antiferromagnetic material to which its magnetic and magnetic effects can be applied. Magnetism is a basic property of matter. Substances can be classified into diamagnetic, paramagnetic, ferromagnetic, antiferromagnetic and ferrimagnetic materials according to their internal structures and their properties in external magnetic fields. Ferromagnetic and ferrimagnetic materials are ferromagnetic materials, and diamagnetic and paramagnetic materials are weak magnetic materials. Magnetic materials can be divided into two types, metal and non-metal. The former mainly include electrical steel, nickel-based alloys and rare earth alloys, and the latter is mainly ferrite materials. According to use, it is divided into soft magnetic material, permanent magnet material and functional magnetic material. Functional magnetic materials mainly include magnetostrictive materials, magnetic recording materials, magnetoresistive materials, bubble materials, magneto-optical materials, gyromagnetic materials, and magnetic thin film materials, etc. Magnetic magnetic curves and magnetic hysteresis loops that reflect the basic magnetic properties of magnetic materials. And magnetic losses.