Study of Magnetic Entropy Change in Nd0.67Ba0.33Mn0.98Fe0.02O3 by Means of Theoretical Models |
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| Authors: | Mohamed Hsini Sobhi Hcini Sadok Zemni |
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| Affiliation: | 1.Laboratory of Physical Chemistry of Materials, Faculty of Science of Monastir, Department of Physics,University of Monastir,Monastir,Tunisia;2.Research Unit of Valorization and Optimization of Exploitation of Resources, Faculty of Science and Technology of Sidi Bouzid,University Campus Agricultural City University of Kairouan,Sidi Bouzid,Tunisia |
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| Abstract: | Magnetic entropy change (?ΔS M ) of Nd0.67 Ba0.33Mn0.98Fe0.02O3 perovskite have been analyzed by means of theoretical models. An excellent agreement has been found between the (ΔSM) values estimated by Landau theory and those obtained using the classical Maxwell relation. In order to estimate the spontaneous magnetization M s pont(T), we used the mean-field theory to analyses the (ΔSM) vs. M 2 data. The obtained M s pont(T) values are in good agreement with those found from the classical extrapolation from the Arrott plots(H/M vs. M 2), confirming that the magnetic entropy is a valid approach to estimate the spontaneous magnetization in our system. At a relatively low magnetic field, a phenomenological model has been used to estimate the values of the magnetic entropy change. The results are in good agreement with those obtained from the experimental data using Maxwell relation. |
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