Explain the origin of magnetic ordering (or) ordering field.

Hint: In order to answer this problem let us first understand magnetism. Magnetic fields mediate a class of physical phenomena known as magnetism. A magnetic field is generated by electric currents and the magnetic moments of elementary particles, which acts on other currents and magnetic moments.

Complete answer:
The quantum mechanical exchange effect is the source of magnetic ordering. The coulombic interactions between the two spins are the physics behind the exchange effect. It depends whether the spins are from a singlet (or) a triplet.In real space, the singlet state has a symmetric wave function, while the triplet state has an antisymmetric wave function.

As a result, when electrons are in the triplet state, they stay out of each other's way. As a consequence, when two electrons are in the triplet state, their coulomb interaction is less than when they are in the singlet state. As a result, the interaction energy (or exchange interaction) is determined by the relative direction of the electrons' spins. The spins of the electrons interact in an exchange relationship, which contributes to the formation of the molecular field.

Note: Temperature, force, and the applied magnetic field all influence a material's magnetic state (or magnetic phase). As these variables shift, a material can exhibit different forms of magnetism. Although the exact observed relationship between strength and distance varies, the strength of a magnetic field almost always decreases with distance. Complicated magnetic fields may result from various combinations of magnetic moments and electric currents.