在高达8 T的磁场下，直接测量Ni50-xCoxMn50-yAly （x = 5,6; y = 18,19）快速淬火带状试样的绝热温度变化

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

Journal of Magnetism and Magnetic Materials Pub Date : 2025-08-19 DOI:10.1016/j.jmmm.2025.173453

Adler Gamzatov , Anvar Kadirbardeev , Yikyung Yu , Nguyen Dan

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引用次数: 0

摘要

在本文中，我们给出了Ni44Co6Mn32Al18和Ni45Co5Mn31Al19带状样品在100-350 K温度范围内，在1.8 T循环磁场中，使用磁场调制方法，以及在8 T磁场中使用经典提取方法的直接测量结果（ΔTad）。结果表明，在磁结构相变（MSPT）附近，在频率为0.2 Hz的1.8 T循环磁场中，两种样品的逆效应值与单次打开磁场时的效应值相比显着降低。对于两种样品，ΔTad(H)在高达8t的磁场中在MSPT附近的行为是不可逆的。当磁场打开时，Ni44Co6Mn32Al18和Ni45Co5Mn31Al19样品在温度为250 K和264 K时分别出现了−1.8 K和−2.0 K的逆磁热效应（MCE）。关闭磁场导致两个样品的MCE的不可逆性，并且样品的最终温度保持在初始水平以下。这是由于8t的磁场不足以在整个样品体积中诱导MSPT，只有部分样品从马氏体相转变为奥氏体相。结果表明，通过调节Ni-Mn-Al合金中Co的浓度可以控制磁结构相变动力学，这将使我们在未来获得具有特定磁冷却技术特性的合金。

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Direct measurements of the adiabatic temperature change of rapidly quenched ribbon samples Ni50-xCoxMn50-yAly (x = 5, 6; y = 18, 19) in magnetic fields up to 8 T

In this paper, we present the results of direct measurements of the adiabatic temperature change (ΔT_ad) in Ni₄₄Co₆Mn₃₂Al₁₈ and Ni₄₅Co₅Mn₃₁Al₁₉ ribbon samples in the temperature range of 100–350 K in a cyclic magnetic field of 1.8 T using the magnetic field modulation method, as well as in a magnetic field of 8 T using the classical extraction method. It is shown that near the magnetostructural phase transition (MSPT), the value of the inverse effect in a cyclic magnetic field of 1.8 T with a frequency of 0.2 Hz decreases significantly for both samples compared to the value of the effect with a single turn on of the magnetic field. For both samples, the behavior of ΔT_ad(H) near the MSPT in magnetic fields up to 8 T is irreversible. When the magnetic field is turned on, an inverse magnetocaloric effect (MCE) is observed with values of −1.8 K and −2.0 K at T = 250 and 264 K, respectively, for the Ni₄₄Co₆Mn₃₂Al₁₈ and Ni₄₅Co₅Mn₃₁Al₁₉ samples. Turning off the magnetic field leads to the irreversibility of the MCE for both samples, and the final temperature of the samples remains below the initial level. This is due to the fact that a magnetic field of 8 T is insufficient to induce MSPT in the entire volume of the sample, only part of the sample transitions from the martensite phase to the austenite phase. It is shown that by regulating the concentration of Co in Ni-Mn-Al alloys we can control the kinetics of the magnetostructural phase transition, which in the future will allow us to obtain alloys with specified characteristics for magnetic cooling technology.

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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.