Explain Ferrimagnetism.

(N/A) Ferrimagnetism is observed when the magnetic moments of the domains in a substance are aligned in parallel and anti-parallel directions in unequal numbers.
These substances are weakly attracted by a magnetic field compared to ferromagnetic substances.
Upon heating,these substances lose their ferrimagnetism and become paramagnetic.
Examples include $MgFe_{2}O_{4}$,$Fe_{3}O_{4}$,and $ZnFe_{2}O_{4}$.