Abstract
The critical exponents around the ferromagnetic–paramagnetic (PM-FM) phase transition and the magnetocaloric effect in the nanocrystalline (NC) Cu50Ni50 powders have been investigated. The alloy powder exhibits a second order magnetic phase transition. For a field change of 1 and 7T, -ΔSMpeak increases from 0.30 to 1.54J/kg.K, respectively, and the relative cooling power values were found to vary between 43.6 and 271.9J/kg. The critical behavior has been studied in details by using the modified Arrott plots and critical isotherm plots. The obtained critical exponent values β=0.505, γ=1.062 and δ=3.037 are close to those predicted from the universal theory of mean-field model. This suggests that the magnetic interactions are long range around the Curie temperature, TC. Low cost magnetocaloric NC CuNi powders are good candidates for magnetic cooling applications.
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