What is the basis for a substance to be magnetized?
The material is composed of molecules, molecules are composed of atoms, atom is composed of atomic nuclei and electrons. In the atom, electronic non-stop rotation, and around the nucleus. These two kinds of motion of electrons will produce magnetic. But in most material, electronic motion direction all the same, out of order, the magnetic effect of offset. Therefore, most of the materials under normal circumstances do not show magnetism.
Whether or not a magnetic field is formed, as long as the material is paramagnetic, iron, cobalt, nickel and their alloys, ferrite will do
Magnetic materials are divided into many tiny regions, each of which is called a magnetic domain, each of which has its own magnetic distance (i.e., a tiny magnetic field). Generally, the magnetic distances of each domain are different, and the magnetic fields cancel each other, so the whole material is not magnetic. When the direction of each domain is uniform, the whole material shows magnetism.The so-called magnetization is to make the magnetic domain of the magnetic domain in the magnetic material become consistent. When the material that does not exhibit magnetism is placed into another strong magnetic field, it is magnetized, but not all materials can be magnetized, and only a few metals and metal compounds can be magnetized.
