Abstract
Origin of the intrinsic coercivity field variations observed by hysteretic measurements established by Nikolic et al. was investigated in detail by ZFC/FC measurements. In this study, magnetic behavior of the samples is further examined by calculation of the ZFC $${{M}_{n}}(T)$$ and $${{M}_{n}}(H)$$ first derivatives. Performed study showed that the main contribution to the measured coercivity comes from the e-Fe2O3 particles, characterized by $$Hci = 24~\;{\text{kOe}}$$ , although both samples posses $${\text{SPM}}$$ e-Fe2O3 fraction. As a result, Hci values of the samples are differed dependent on the quantity of the SPM e-Fe2O3 particles in the sample. Mechanism of the intrisic coercivity field variations is discussed.
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