Study and Modeling of the Magnetocaloric Effect in the La{sub 0.67}Ba{sub 0.33}Mn{sub 0.9}Fe{sub 0.1}O{sub 3} Compound
- Université de Monastir, Laboratoire de Physico-chimie des Matériaux, Département de Physique, Faculté des Sciences de Monastir (Tunisia)
The simulated magnetic entropy change of La{sub 0.67}Ba{sub 0.33}Mn{sub 0.9}Fe{sub 0.1}O{sub 3} manganite was determined using the mean field theory and a scaling method. Based on the Brillouin function, this method allowed us to simulate magnetic isotherms which are crucial for the simulation of the magnetic entropy change. The simulated entropy change is very close to that determined from experimental magnetic isotherms. In particular, the experimental and simulated maximum entropy change and relative cooling power are respectively suitable and in good agreement. The Bean–Rodbell model was used to simulate magnetization versus temperature curve. The obtained Curie temperature value is much well than that determined experimentally. Under low values of applied field, a phenomenological model has been intervened to simulate magnetization, magnetic entropy change, and the specific heat change versus temperature. This scaling method based on mean field theory leads to a direct estimation of the exchange parameter (λ ), the saturation magnetization (M{sub 0}), the total angular momentum (J), and the gyromagnetic factor (g) of our material. These parameters were used for simulating M(T,H) isotherms, which are used for the estimation of the magnetic entropy change (ΔS{sub M}) of La{sub 0.67}Ba{sub 0.33}Mn{sub 0.9}Fe{sub 0.1}O{sub 3}.
- OSTI ID:
- 22919620
- Journal Information:
- Journal of Superconductivity and Novel Magnetism, Journal Name: Journal of Superconductivity and Novel Magnetism Journal Issue: 2 Vol. 32; ISSN 1557-1939
- Country of Publication:
- United States
- Language:
- English
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