In amorphous alloys with two sets of secondary networks (Dy Co, Dy Fe, etc.), the magnetic moments of each atom exhibit a certain degree of dispersion relative to a specific direction. Because the total magnetic moments on the two networks are different in size and opposite in direction, a scattered Ferrimagnetism magnetic structure is formed.

The reason for the existence of the above three magnetic structures is that rare earth atoms have strong local anisotropy, while the Exchange interaction of 4f electrons between their atoms is relatively weak, so the orientation of the magnetic moment has an angular dispersion, for example, the dispersion angle of Dy's magnetic moment in DyCo3 is about 140 °. However, the Exchange interaction of Co atom is very strong, so the magnetic moment orientation of Co atom is not dispersive, and the magnetic moment of Fe atom has a very small dispersion angle, thus forming dispersive Ferrimagnetism. When forming an alloy film with atoms with zero magnetic moment such as Ni or Y, scattered ferromagnetism occurs.

The difference between ferromagnetism and paramagnetism is that the atomic magnetic moment orientation of the former does not fluctuate randomly with time