What type of substances would make better permanent magnets,ferromagnetic or ferrimagnetic? Justify your answer.

(A) Ferromagnetic substances make better permanent magnets.
In the solid state,the metal ions of ferromagnetic substances are grouped together into small regions called domains. Each domain acts as a tiny magnet.
In an unmagnetised piece of a ferromagnetic substance,the domains are randomly oriented,causing their magnetic moments to cancel out.
However,when the substance is placed in an external magnetic field,all the domains align in the direction of the magnetic field,producing a strong magnetic effect.
This alignment of the domains persists even after the removal of the external magnetic field,thereby making the ferromagnetic substance a permanent magnet.