Generally the coercivity of a ferrimagnetic material drops to almost zero at the magnetic compensation temperature and it can be explained generally due to the comepensated magnetic moments of the two sublattices of the ferrimagnetic material. But if coercivity is maximum at the compensation temperature then what may be the reasons for it?
What method do You use to measure Hc? If there is no magnetization and no hysteresis curve, from which you can retrieve the value of the coercive force.
At temperature compensation, the ferromagnetic is like antiferromagnet, but near the temperature compensation it is possible the phenomena such as the so-called spin-preorientation phase transitions, tipping and skewing of the magnetic sublattices due to the presence of the magnetic anisotropy. So, for example, it can be transition in the field-induced ferromagnetic state. Depending on the direction of the external magnetic field relative to the crystallographic axes (axes of anisotropy), it occurs through one or several first-order phase transitions. As a result, the minor hysteresis loops may appear for curve M(H).
If your ferrimagnetic is highly diluted (near the point of compositional compensation of the magnetic moment), there may be additional effects associated with the transition from a state of spin glass (clusters with short-range magnetic ordering) to ferri-like frustrated magnetic structure (with a broken magnetic bonds), consisting of clusters due short-range ordering.
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