Abstract
The magnetocaloric effect (MCE) of Ni0.4Mg0.3Cu0.3Fe2O4 ferrite was analyzed by different theoretical methods such as mean-field, Bean-Rodbell and Landau theories. Results confirm the second order type of the ferromagnetic (FM)—paramagnetic (PM) magnetic phase transition for the sample. The values of magnetic entropy change (−ΔSM) estimated from each theory agree well with those experimentally determined using Maxwell relations. The spontaneous magnetization values (Mspont(T)) determined from both (−ΔSM versus M2) and (H/M versus M2) data are very close, confirming the validity of the magnetic entropy change to estimate Mspont(T) values. The critical exponents (β, γ and δ) obtained for Ni0.4Mg0.3Cu0.3Fe2O4 sample at its Curie temperatures (TC) are close to those predicted in mean-field model.
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