Co2FeAl Heusler合金纳米颗粒的巨磁热效应
Giant magnetocaloric effect in Co2FeAl Heusler alloy nanoparticles
摘要：
在化学合成的平均粒径为16 nm的Co2 FeAl Heusler合金纳米颗粒中观察到了铁磁（FM）到顺磁（PM）相变的巨磁热效应。在我们以前的报告中，我们已经观察到一个显着的增强，其饱和磁化强度（Ms）和居里温度（Tc）相比，散装对应。从这些结果的动机，在这里，我们的目标是探索其磁热性能附近的Tc。磁熵变在1252 K处出现正异常。磁熵变随磁场的增加而线性增加，在14 kOe的中等磁场下，磁熵变可达~15 J/Kg-K。对于14 kOe的磁场变化，它导致89 J/Kg的净相对冷却功率。为了证实磁相变的本质，对其磁化强度进行了详细的研究。Arrott图和普适曲线的性质得出结论，在本系统中FM到PM相变是二阶的。
英文摘要：
A giant magnetocaloric effect across the ferromagnetic (FM) to paramagnetic (PM) phase transition was observed in chemically synthesized Co2FeAl Heusler alloy nanoparticles with a mean diameter of 16 nm. In our previous report, we have observed a significant enhancement in its saturation magnetization (Ms) and Curie temperature (Tc) as compared with the bulk counterpart. Motivated from those results, here, we aim to explore its magnetocaloric properties near the Tc. The magnetic entropy change shows a positive anomaly at 1252 K. Magnetic entropy change increases linearly with the magnetic field, and a large value of ~15 J/Kg-K is detected under a moderate field of 14 kOe. It leads to a net relative cooling power of 89 J/Kg for the magnetic field change of 14 kOe. To confirm the nature of magnetic phase transition, a detailed study of its magnetization is performed. The Arrott plot and nature of the universal curve conclude that FM to PM phase transition in the present system is of second-order.
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