① Ferromagnetic structure. The spatial orientation of atomic magnetic moments is consistent over a considerable area (10-4cm). W. K. Heisenberg pointed out theoretically that this is due to the Exchange interaction of electrons between atoms.

② Antiferromagnetism magnetic structure. The orientation of atomic magnetic moments on a row of crystal sites (or a crystal plane) is opposite to that of their neighboring atoms. Due to the equal magnitude of magnetic moments, they cancel out each other, resulting in a total magnetic moment of zero. For example, in the case of MnO (Figure 1). P. W. Anderson discussed this problem in detail with indirect Exchange interaction. ③ Ferrimagnetism magnetic structure. It is an uncompensated Antiferromagnetism magnetic structure. Due to the unequal magnetic moments and opposite orientations of two (or more) magnetic atoms (or ions), ferrite magnetism belongs to this magnetic structure