We know that

Curies law states that susceptibility of a paramagnetic substance is inversely proportional to its absolute temperature

Where

C =constant called curie constant

T=temperature

This law holds only when material is far away from saturation(i.e. magnetization has not become constant)

According to question saturation has been achieved and curie’s law doesn’t hold true now (i.e. does not changes with temperature)

Also magnetization is given by

Where

χ =susceptibility

H=magnetic intensity

Since and H⃗ remains constant therefore magnetization will also remain constant

Therefore, when a paramagnetic material is placed in a magnetic field and saturation is achieved on decreasing the temperature magnetization remains constant