Solid-state magnetic refrigeration, based on the magnetocaloric effect, is a promising, highly energy-efficient, and environmentally friendly cooling technology. High-entropy metallic glasses (HE-MGs) have attracted increasing interests due to their excellent magneto-caloric properties across a wide temperature range. In this work, we successfully prepared three rare-earth (RE) based HE-MGs microwires and investigated their structural and magnetocaloric properties. The Gd25Dy25Co25Al25, Tb20Gd20Dy20Co20Al20, and Ho20Gd20Dy20Co20Al20 microwires exhibit an amorphous structure with good glass forming ability. They undergo a second-order phase transition from ferromagnetic to paramagnetic states around Curie temperatures of ∼61 K, ∼63 K, and ∼ 47 K, respectively. The peak magnetic entropy change (-ΔSM) for these HE-MGs microwires range from 8.2 J kg−1 K−1 to 10.2 J kg−1 K−1 under a 5 T magnetic field change. Furthermore, the refrigeration capacities of these microwires are evaluated to be between 504 J kg−1 and 507 J kg−1 (5 T), demonstrating their exceptional cooling efficiency. Additionally, this study provides valuable insights for the further research and development of RE-containing HE-MGs, paying the way for optimized materials tailored for advanced magnetic refrigeration applications.

中文翻译：

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GdDyCoAl基高熵金属玻璃微丝的微观结构和磁热行为


固态磁制冷基于磁热效应，是一种极具前景、高效节能、环保的制冷技术。高熵金属玻璃（HE-MG）由于在较宽的温度范围内具有优异的磁热性能而引起了越来越多的兴趣。在这项工作中，我们成功制备了三种稀土（RE）基HE-MGs微线，并研究了它们的结构和磁热特性。 Gd25Dy25Co25Al25、Tb20Gd20Dy20Co20Al20和Ho20Gd20Dy20Co20Al20微丝表现出具有良好玻璃形成能力的非晶结构。它们分别在~61 K、~63 K 和~47 K 的居里温度附近经历从铁磁态到顺磁态的二级相变。在 5 T 磁场变化下，这些 HE-MG 微线的峰值磁熵变 (-ΔSM) 范围为 8.2 J kg−1 K−1 到 10.2 J kg−1 K−1。此外，这些微丝的制冷能力经评估介于 504 J kg−1 和 507 J kg−1 (5 T) 之间，证明了其卓越的冷却效率。此外，这项研究为进一步研究和开发含稀土 HE-MG 提供了宝贵的见解，为先进磁制冷应用定制的优化材料铺平了道路。