The MCE in the A 0.48/B 0.52 has demonstrated that the use of composite increases the efficiency of magnetic cooling with μ 0 H = 5 T by 23.16%. The obtained Δ S M( T) is ≈4.07 J kg −1 K −1 in a field change of 0–5 T in a wide temperature span over Δ T FWHM ∼ 68.17 K, resulting in a large refrigerant capacity value of ≈232.85 J kg −1. A table-like magnetocaloric effect is observed and the result is found to be in good agreement with the calculations. Magnetic measurements show that the composite exhibits two successive magnetic transitions and possesses a large MCE characterized by two Δ S M( T) peaks. To test these calculations experimentally, the composite with nominal composition A 0.48/B 0.52 is prepared by mixing both individual samples A and B. The optimum Δ S M( T) of the composite with x = 0.48 approaches a nearly constant value showing a table-like behaviour under 5 T. The Δ S M( T) is calculated for A x/B 1− x composites with 0 ≤ x ≤ 1. This behaviour is due to the presence of metamagnetic transition.
An asymmetric broadening of the maximum of Δ S M with increasing field is observed in both samples. The investigated samples show large magnetic entropy change (Δ S M) produced by the sharp change of magnetization at their Curie temperatures. It is also shown that these compounds undergo a first-order ferromagnetic–paramagnetic phase transition around their respective T C. The substitution of La by 10% Eu enhances the value of magnetization and reduces the Curie temperature ( T C). These compounds are synthesized by a solid-state reaction route and indexed with respect to Sr 3Ti 2O 7-type perovskite with the I4/ mmm space group. In this work, we have investigated the structural, magnetic and magnetocaloric properties of La 1.4Ca 1.6Mn 2O 7 (A) and La 1.3Eu 0.1Ca 1.6Mn 2O 7 (B) oxides.
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