Most ferromagnetic materials consist of molecules, atoms made up of atoms, and nuclei made of atoms and electrons. Inside the atom, electrons rotate and rotate around the nucleus. The two kinds of electrons produce magnetic force. But in most matter, the direction of electron movement is different, disorder, magnetic effects cancel each other out. As a result, most materials do not seem to be magnetically normal under normal conditions.
Ferro-magnetic materials such as iron, cobalt, nickel or ferrite are different. Their internal electron spin can spontaneously arranged in a small area, forming a spontaneous magnetization region, called the magnetic domain. After the ferromagnetic material is magnetized, the inner magnetic domains are neat and in the same direction, and the magnetic field is strengthened to form a strong magnet. The iron absorption process is a strong magnet magnetized with different polarities between iron magnetization and strong magnetic attraction. Iron is a strong and powerful magnet "stick" together. We say that a strong magnet is magnetic.