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Ferrimagnetic materials have a net magnetic moment, which can be greater or smaller than the magnetic moment of ferromagnetic materials. This is because in ferrimagnetism, the magnetic moments of the different ions in the material are aligned antiparallel, leading to a partial cancellation of the magnetic moments. In ferromagnetism, all magnetic moments are aligned in the same direction, leading to a stronger overall magnetic moment. So, it's not always true that ferrimagnetic materials have a greater magnetic moment than ferromagnetic materials.