In this article, is introduce a calculation approach derived from integrating the Landau theory with the Arrott–Noakes equation. Employing a creative formulation, is conduct simulations to explore the magnetic entropy change, within a random ferromagnetic system. This theoretical approach is used for the examination of a given La0.7Sr0.3–xSmxMn0.95Ni0.05O3 (x = 0, 0.05, 0.10, 0.15) manganites. Initially, the critical exponents (𝛾; 𝛽) of these compounds are estimated. It has been noted that the magnetic behavior of the examined materials near the phase transition deviate from the standard patterns observed in typical universality classes. Subsequently, these exponents are exploited to simulate the isothermal curves under higher magnetic fields. The predicted relative cooling power values reach 420.3, 415.7, 412.5, and 408.4 J.kg−1K−1 under 10 T applied magnetic field for La0.7Sr0.3–xSmxMn0.95Ni0.05O3 with x = 0, 0.05, 0.10 and 0.15, respectively.

中文翻译：

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预测 La0.7Sr0.3–xSmxMn0.95Ni0.05O3 （x = 0， 0.05， 0.10， 0.15） 锰矿中磁热效应的临界指数的现实估计


在本文中，介绍了一种通过将 Landau 理论与 Arrott-Noakes 方程集成而得出的计算方法。采用创造性的公式，进行模拟以探索随机铁磁系统内的磁熵变化。这种理论方法用于检查给定的 La0.7Sr0.3–xSmxMn0.95Ni0.05O3 （x = 0， 0.05， 0.10， 0.15） 锰酸盐。最初，估计这些化合物的临界指数 （γ; β）。已经注意到，被检查材料在相变附近的磁行为偏离了在典型通用性类别中观察到的标准模式。随后，利用这些指数来模拟更高磁场下的等温曲线。在 10 T 施加磁场下，对于 La0.7Sr0.3–xSmxMn0.95Ni0.05O3，x = 0、0.05、0.10 和 0.15，预测的相对冷却功率值分别达到 420.3、415.7、412.5 和 408.4 J.kg−1K−1。