Critical behavior and tunable magnetocaloric effect in (Gd1-xErx)3Al2 alloys

IF 2.5 3区材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

Journal of Magnetism and Magnetic Materials Pub Date : 2024-10-22 DOI:10.1016/j.jmmm.2024.172606

Lina Jiang , Cuicui Hu , Yang Chen , Fang Tang , Haifeng Chen , Zilu Xia , Yong Fang , Bin Qian , Haicheng Xuan , Zhida Han

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Abstract

The magnetic properties, magnetocaloric effect, and the critical behavior near Curie temperature (T_C) were systematically studied in a series of (Gd_1-_xEr_x)₃Al₂ (x = 0, 0.1, 0.2, 0.3) alloys. As the Er content increases, both the T_C and lattice constant gradually decrease. The maximum magnetic entropy change and refrigerant capacity remain relatively high, ranging from −5.8 to −8.5J/kg K and 209.0 to 290.8 J/kg respectively, for a field change of 5 T. The critical exponents, derived from the field dependence of magnetic entropy change, conform to scaling theory and are consistent with those obtained using the Kouvel–Fisher method. These findings suggest that the reliability of the obtained critical exponents and imply the presence of long-range exchange interactions in (Gd_1-_xEr_x)₃Al₂ alloys.

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(Gd1-xErx)3Al2合金中的临界行为和可调磁ocaloric效应

系统研究了一系列 (Gd1-xErx)3Al2 (x = 0, 0.1, 0.2, 0.3) 合金的磁性能、磁致效应以及居里温度 (TC) 附近的临界行为。随着 Er 含量的增加，TC 和晶格常数都逐渐降低。磁场变化为 5 T 时，最大磁熵变化和制冷剂容量仍然相对较高，分别为 -5.8 至 -8.5J/kg K 和 209.0 至 290.8 J/kg。这些发现表明所获得的临界指数是可靠的，并暗示了 (Gd1-xErx)3Al2 合金中存在长程交换相互作用。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of Magnetism and Magnetic Materials 物理-材料科学：综合

CiteScore

5.30

自引率

11.10%

发文量

1149

审稿时长

59 days

期刊介绍： The Journal of Magnetism and Magnetic Materials provides an important forum for the disclosure and discussion of original contributions covering the whole spectrum of topics, from basic magnetism to the technology and applications of magnetic materials. The journal encourages greater interaction between the basic and applied sub-disciplines of magnetism with comprehensive review articles, in addition to full-length contributions. In addition, other categories of contributions are welcome, including Critical Focused issues, Current Perspectives and Outreach to the General Public. Main Categories: Full-length articles: Technically original research documents that report results of value to the communities that comprise the journal audience. The link between chemical, structural and microstructural properties on the one hand and magnetic properties on the other hand are encouraged. In addition to general topics covering all areas of magnetism and magnetic materials, the full-length articles also include three sub-sections, focusing on Nanomagnetism, Spintronics and Applications. The sub-section on Nanomagnetism contains articles on magnetic nanoparticles, nanowires, thin films, 2D materials and other nanoscale magnetic materials and their applications. The sub-section on Spintronics contains articles on magnetoresistance, magnetoimpedance, magneto-optical phenomena, Micro-Electro-Mechanical Systems (MEMS), and other topics related to spin current control and magneto-transport phenomena. The sub-section on Applications display papers that focus on applications of magnetic materials. The applications need to show a connection to magnetism. Review articles: Review articles organize, clarify, and summarize existing major works in the areas covered by the Journal and provide comprehensive citations to the full spectrum of relevant literature.