Abstract
The causes of the increased coercivity of cobalt—ferrite epitaxial γ-Fe 2O 3 were studied. The results show that the coercivity of this powder may be contributed by three kinds of anisotropies: (1) shape anisotropy, (2) crystalline anisotropy and (3) magnetic induced anisotropy of the cobalt—ferrite epitaxial layer of this powder. With magnetic annealing experiments and the method of calculated coercivity of mixed powder, the coercivity contributed by crystalline and magnetic induced anisotropy can be estimated. The calculated coercivity corresponds with the measured coercivity very well, the value and the proportion of coercivity contributed from these three magnetic anisotropies vary with the epitaxial layer thickness.
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