Critical behavior and magnetocaloric effect simulation in TbFeSi and DyFeSi intermetallic compounds using a Landau universal

In this paper, we introduce a novel calculation method of magnetic entropy change in an arbitrary ferro
magnetic system based on the Landau model for Gibbs free energy and the Arrott–Noakes equation, −ΔSM
= [ 1
1
dB(T)
γ
+1
γ
+1 −MS
1
γ
+1) + 1
1
β
+1
γ
+1
dT
(M
β
+1
γ
+1 − MS
1
β
+1
γ
+1) − (M − MS)H1
γ]H1−1
γ . This theoretical study was applied to TbFeSi
(TFS) and DyFeSi (DFS) intermetallic compounds. First, the critical exponents (β; γ) are found as (0.46; 1.08) and (0.26; 1) for TFS and DFS,
respectively. Second, the limitations of the Arrott–Noakes equation in simulating the hole −ΔSM(H,T) curves were discussed. Third, the
usefulness of the new method reported earlier predicted large RCP values of around 810 and 779 J kg−1 under a 10 T magnetic field for TFS
and DFSsamples, respectively.
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