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Ferromagnetic materials generally have larger net magnetic moments than ferrimagnetic materials. This is because in ferromagnets, all the magnetic moments of the atoms align in the same direction, leading to a strong overall magnetization. In ferrimagnets, the magnetic moments of the atoms are aligned in opposite directions, but there's an imbalance, resulting in a weaker net magnetization. This imbalance arises from different magnitudes of the magnetic moments of the constituent ions.