Magnetocaloric Effect in DyFe3 and GdFe3

Document Type : Original Article

Authors

1 Department of Physics, Damietta University, New Damietta, Egypt

2 Department of Physics, Helwan University, Helwan, Egypt

Abstract

In this work, we report on specific magnetothermal properties and magnetocaloric effect (MCE) of DyFe3 and GdFe3 compounds. The calculation, using the Mean-Field Theory (MFT) of magnetic moment showed that both DyFe3 and GdFe3 are ferri-magnetic compounds with compensation temperatures around 509 K and 597 K, and Curie temperatures about 624K and 745K for DyFe3 and GdFe3 respectively. The maximum calculated isothermal entropy change |〖ΔS〗_m (T,ΔH)| are 0.21 and 0.19 J/mol.K and the maximum calculated adiabatic change in temperature |〖ΔT〗_ad (T,ΔH)| are 0.92 and 0.82 K at field change=4 T for DyFe3 and GdFe3 respectively. The relative cooling powers RCP(S) and RCP(T), for a field change of 4T, are 4 and 3.8 J/mol and 19.5 and 24.6 K2 for DyFe3 and GdFe3. Furthermore, the calculation of the critical exponents supports the suitability of the MFT for handling the systems under study. The type of the magnetic phase transition, at the Curie temperatures, is also reported and turned out to be a second order one.

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