According to the magnetic properties of magnetic materials, magnetic materials can be divided into
Magnetic materials are difficult to be divided into soft magnetic materials and hard magnetic materials after magnetization. It is easy to remove the magnetic material after magnetization. It is called soft magnetic material, and the material which is not easy to be magnetized is called hard magnetic material.
According to the characteristics of a substance in an external magnetic field, matter can be divided into five classes: paramagnetic, diamagnetic, ferromagnetic, sub magnetic, diamagnetic.
