Explanation

Because the direction of the induced magnetic field in some materials is the same as that of the external magnetic field, materials are attracted by the external magnetic field. The permeability of paramagnetic materials is not less than 1. paramagnetism is the opposite of diamagnetism, and diamagnetism materials are repelled by the external magnetic field. The difference between paramagnetic materials and ferromagnetic and ferromagnetic materials is that the latter two materials still have residual magnetism when there is no external magnetic field, but the magnetism of paramagnetic materials cannot be maintained. paramagnetism is due to the existence of unpaired electrons in the atoms of such materials. The spin magnetic moments of these unpaired electrons align along the direction of the external magnetic field, forming an induced magnetic field that is consistent with the direction of the external magnetic field. When the external magnetic field disappears, the order of the electron spin magnetic moment in the paramagnetic materials will be destroyed due to the thermal movement of the lattice, resulting in the disappearance of the macro magnetism. paramagnetism can also be observed in ferromagnetic materials whose temperature is higher than curie point and antiferromagnetic materials whose temperature is higher than Neel temperature.

Classification