5. Magnetism and matter — Physics STD 12 Science — Question

In addition to the orbital motion, every electron is assumed to have a spin motion around its axis. Therefore, another dipole magnetic moment called spin magnet $\vec{M}_{s}$ is also associated with electron. The vector sum of $\vec{M}_{l}$ and $\vec{M}_{s}$ provides the net magnetic dipole moment $\vec{M},$ to the atom. $\vec{M}_{s}$ is much greater than $\vec{M}_{l}$, hence magnetism of magnet is due to spin of electrons.