scholarly journals The Mean-Field Theory in the Study of Ferromagnets and the Magnetocaloric Effect

10.5772/21595 ◽  
2011 ◽  
Author(s):  
J. S. ◽  
S. Das ◽  
V. S.
Keyword(s):  
Field Theory ◽  
Magnetocaloric Effect ◽  
Mean Field Theory ◽  
Mean Field ◽  
The Mean

scholarly journals Magnetocaloric Effect in Nanosystems Based on Ferromagnets with Different Curie Temperatures

2021 ◽  
Vol 132 (1) ◽  
pp. 79-93
Author(s):  
M. A. Kuznetsov ◽  
A. B. Drovosekov ◽  
A. A. Fraerman
Keyword(s):  
Field Theory ◽  
Magnetocaloric Effect ◽  
Landau Theory ◽  
Mean Field Theory ◽  
Mean Field ◽  
Maxwell Relation ◽  
Magnetic Cooling ◽  
The Mean ◽  
Curie Temperatures ◽  
Good Agreement

Abstract The magnetocaloric effect in nanosystems based on exchange-coupled ferromagnets with different Curie temperatures is calculated within the mean-field theory. Good agreement between the results of the mean-field theory and the Landau theory, valid near the critical phase transition temperature, is demonstrated for a flat-layered Fe/Gd/Fe structure. We show that a high magnetic cooling efficiency in this system is attainable in principle and prove the validity of the Maxwell relation, enabling an experimental verification of the predictions made. The theory developed for flat-layered structures is generalized to a granular medium.

Modeling the Magnetocaloric Effect of La0.8MnO3 by the Mean-Field Theory

2019 ◽  
Vol 33 (4) ◽  
pp. 1143-1149
Author(s):  
C. Henchiri ◽  
A. Benali ◽  
T. Mnasri ◽  
M. A. Valente ◽  
E. Dhahri
Keyword(s):  
Field Theory ◽  
Magnetocaloric Effect ◽  
Mean Field Theory ◽  
Mean Field ◽  
The Mean

scholarly journals Modeling the Magnetocaloric Effect of Nd0.67Ba0.33Mn0.98 Fe0.02O3 by the Mean Field Theory

2020 ◽  
Author(s):  
Mohamed Hsini ◽  
Sadok Zemni
Keyword(s):  
Field Theory ◽  
Phase Transition ◽  
Magnetic Properties ◽  
Magnetic Fields ◽  
Magnetocaloric Effect ◽  
Mean Field Theory ◽  
Mean Field ◽  
Entropy Change ◽  
Magnetization Curves ◽  
The Mean

In this paper, we have exploited the mean field theory combined with the Bean-Rodbell model to justify the magnetocaloric effect (MCE) in Nd0.67Ba0.33Mn0.98Fe0.02O3 sample. The simulation of some magnetic properties has been investigated. Modeling magnetization curves have been successfully achieved using this model. The second-order ferromagnetic-paramagnetic (FM-PM) phase transition of our system has been verified through the value of the parameter which controls the transition nature in the Bean-Rodbell model. Theoretical and experimental expressions, which have rated the magnetic entropy change ( − ∆ S M ) under various magnetic fields, have been derived. Theoretical ( − ∆ S M ) curves have been compared to the experimental ones.

Modeling the Magnetocaloric Effect of La0.67Pb0.33MnO3 by the Mean-Field Theory

2018 ◽  
Vol 31 (11) ◽  
pp. 3717-3722 ◽  
Author(s):  
Mohamed Hsini ◽  
S. khadhraoui ◽  
N. Zaidi ◽  
Ziyad A. Alrowaili
Keyword(s):  
Field Theory ◽  
Magnetocaloric Effect ◽  
Mean Field Theory ◽  
Mean Field ◽  
The Mean

scholarly journals Evidence of exactness of the mean-field theory in the nonextensive regime of long-range classical spin models

2000 ◽  
Vol 61 (17) ◽  
pp. 11521-11528 ◽  
Author(s):  
Sergio A. Cannas ◽  
A. C. N. de Magalhães ◽  
Francisco A. Tamarit
Keyword(s):  
Field Theory ◽  
Long Range ◽  
Mean Field Theory ◽  
Mean Field ◽  
Spin Models ◽  
Classical Spin ◽  
The Mean ◽  
Classical Spin Models
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