Quasi-isothermal magnetocaloric effect in the DyAl2 alloy in magnetic field up to 14 T

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

Journal of Magnetism and Magnetic Materials Pub Date : 2024-10-24 DOI:10.1016/j.jmmm.2024.172612

A.S. Kuznetsov , A.V. Mashirov , I.I. Musabirov , M.S. Anikin , V.I. Mitsiuk , Yu.S. Koshkid’ko , J. Ćwik , A.P. Kamantsev , E.E. Kokorina , K.A. Kolesov , V.G. Shavrov

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Abstract

Experimental and analytical studies were carried out on the magnetocaloric effect (MCE) in the rare-earth alloy of the Laves phase DyAl₂, which has the second-order magnetic phase transition (PT) in the region of cryogenic temperatures. The measurements are carried out using an extraction magnetic calorimeter with a Bitter electromagnet. A polycrystalline DyAl₂ sample was synthesized followed by heat treatment. X-ray diffraction and elemental chemical analyzes are provided. The magnetization of the sample was measured in magnetic fields up to 13.5 T. Calculations of the entropy changes of the magnetic subsystem ΔS_mag are provided. Measurements of the MCEs ΔT − effect in adiabatic and ΔQ − effect in quasi-isothermal conditions were carried out. The MCE investigated by direct method in the temperature range of 15–110 K and magnetic field up to 14 T. It was found that the maximum of the adiabatic MCE in the region of the Curie temperature of the DyAl₂ alloy under adiabatic magnetization in a magnetic field of 14 T is ΔT = 12.94 K. The obtained values are well approximated by the

Δ T \sim Δ H^{2 / 3}

, The maximum value of the quasi-isothermal MCE is ΔQ = 3.1 kJ/kg. The value corresponds to the maximum of the entropy change of the magnetic subsystem ΔS_mag = 32.3 J/(kg*K). The influence of thermal contact resistance (TCR) on the results of measuring the MCE under quasi-isothermal conditions is assessed.

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磁场高达 14 T 时 DyAl2 合金中的准等温磁致效应

对拉维斯相 DyAl2 稀土合金中的磁致效应（MCE）进行了实验和分析研究，该合金在低温区域具有二阶磁性相变（PT）。测量是使用带有比特电磁铁的萃取磁量热仪进行的。在合成多晶 DyAl2 样品后进行了热处理。提供了 X 射线衍射和元素化学分析。提供了磁性子系统 ΔSmag 的熵变计算。此外，还测量了绝热条件下的 MCE ΔT 效应和准等温条件下的 MCE ΔQ 效应。结果发现，在 14 T 的磁场中，DyAl2 合金绝热磁化下居里温度区域的绝热 MCE 最大值为 ΔT = 12.94 K。所获得的数值与 ΔT∼ΔH2/3 近似，准等温 MCE 的最大值为 ΔQ = 3.1 kJ/kg。该值对应于磁性子系统熵变的最大值 ΔSmag = 32.3 J/(kg*K)。评估了热接触电阻 (TCR) 对准等温条件下测量 MCE 结果的影响。

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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.