At low temperature, the explored samples x=0.0 and x=0.06 exhibit high saturation magnetization because of low canting of spins as is evident from the reduced Y-K angles and decreased difference in theoretical and experimental magnetic moments at low temperature. Fig. 6a,b are the M-H loops recorded at 77K for x=0.0 and x=0.06 systems. The coercivity values have increased. In ferrites, the coercive force is got by the reversal of directions of the wall movement and that of domain rotation by reversing the direction of the applied magnetic field. In general, the effective pinning of domain wall causes the coercivity and in the present investigation, the coercive values are high because of low probability of domain rotation at low temperature as it is difficult to thermally overcome the high magneto anisotropy.


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