Theoretical analysis of the anomalous table-like magnetocaloric effect in Er0.5Gd0.5Al2

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

Journal of Magnetism and Magnetic Materials Pub Date : 2025-05-07 DOI:10.1016/j.jmmm.2025.173111

P.J. von Ranke , P.O. Ribeiro , B.P. Alho , R.S. de Oliveira , A.M.G. Carvalho

引用次数: 0

Abstract

We investigated the recently reported anomalous entropic magnetocaloric effect in the ferromagnetic compound Er_0.5Gd_0.5Al₂ across a wide temperature range, exhibiting a table-like profile, from a theoretical perspective. Our model Hamiltonian incorporates crucial interactions: the crystalline electric field, intra- and inter-magnetic sublattice exchanges, and directional Zeeman effects. The simulated results successfully elucidate the origin of this anomalous effect, which arises from magnetic moment compensation between the Er and Gd sublattices. Additionally, we map the spin reorientation from the easy 〈1 1 1〉 to the 〈0 0 1〉 hard magnetization directions and predict an anomalous adiabatic magnetocaloric effect.

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Er0.5Gd0.5Al2中反常表状磁热效应的理论分析

我们从理论的角度研究了最近报道的铁磁化合物Er0.5Gd0.5Al2在宽温度范围内的反常熵磁热效应，表现出表状分布。我们的模型哈密顿量包含了关键的相互作用：晶体电场，磁内和磁间亚晶格交换，以及定向塞曼效应。模拟结果成功地阐明了这种异常效应的来源，这是由Er和Gd亚晶格之间的磁矩补偿引起的。此外,我们从简单的地图旋转的重新定位< 1 1 1 >的< 0 0 1 >难磁化方向和预测异常绝热磁热效应。

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.