التفاصيل البيبلوغرافية
| العنوان: |
Modeling of magnetic and magnetocaloric properties of polycrystalline La0.85Sr0.15Mn0.99Fe0.01O3 by a mean-field scaling method. |
| المؤلفون: |
Brahiti, N., Balli, M., Fournier, P. |
| المصدر: |
Journal of Applied Physics; 6/28/2024, Vol. 135 Issue 24, p1-11, 11p |
| مصطلحات موضوعية: |
MAGNETIC entropy, MAGNETIC properties, ANGULAR momentum (Mechanics), CURIE temperature, GAUSSIAN distribution, MEAN field theory, TEMPERATURE distribution |
| مستخلص: |
Magnetic and magnetocaloric properties of L a 0.85 S r 0.15 M n 0.99 F e 0.01 O 3 perovskite oxides are investigated in the framework of the mean-field theory with a goal to develop a comprehensive model with parameters that can be used to optimize the caloric performances for cooling applications. Using the experimental magnetic isotherms M(H,T), we estimate and compare the exchange parameter (λ) , the saturation magnetization (M 0) , the total angular momentum (J) , and the gyromagnetic factor (g) for two different samples annealed at 1170 and 1250 °C. These parameters are used, in turn, in the simulation of the magnetic and the magnetocaloric properties of these L a 0.85 S r 0.15 M n 0.99 F e 0.01 O 3 compounds assuming imperfect samples with compositional and/or magnetic inhomogeneities. For this purpose, a Gaussian distribution of the Curie temperature is assumed. The temperature dependence of the magnetic entropy change, − Δ S M (T) , resulting from an applied field variation is simulated for both samples. The selected distribution captures the rounding of the − Δ S M (T) peak at its maximum and its broadening with growth conditions, features that are constantly observed in many bulk polycrystalline compounds. [ABSTRACT FROM AUTHOR] |
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| قاعدة البيانات: |
Complementary Index |
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