Frequency stabilization of adiabatic temperature change in Fe50Rh50 alloy in a cyclic magnetic field of 1.2 T

IF 3.5 2区物理与天体物理 Q2 PHYSICS, APPLIED

Applied Physics Letters Pub Date : 2024-09-10 DOI:10.1063/5.0222360

A. G. Gamzatov, P. A. Igoshev, A. M. Aliev, K. Qiao, F. Hu, J. Wang, B. Shen

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引用次数: 0

Abstract

We present the results of direct measurements of the adiabatic temperature change (ΔTad) for the Fe50Rh50 alloy in a cyclic magnetic field (CMF) of 1.2 T. It is shown that increasing the frequency of the CMF from 1 to 30 Hz is accompanied by a shift of the position of temperature dependence ΔTad(T) maximum, Tmax, toward low temperatures. With an increase in the CMF frequency from 1 to 5 Hz, the ΔTmax value decreases by ∼12%. A further increase in frequency leads to stabilization of the effect. In the vicinity of the antiferromagnetic-ferromagnetic phase transition point TC = 370 K, ΔTad exhibits unconventional frequency behavior: while at T well above TC, the value of ΔTad monotonously decreases as frequency increases, at T = 370.4 K; an interval of frequency-independent ΔTad up to 10 Hz is observed, and at 368 K < T < TC, the maximum of ΔTad(f) dependence is found in the interval 1 < f < 10 Hz. Such behavior in the future can be applied in magnetic cooling technology due to large values of ΔTad and the frequency stability of the effect in alternating fields. The specific cooling power reaches giant values of ∼22 W/g at 20 Hz, which is comparable to the values under the same conditions for Gd −21.6 W/g. The unconventional behavior of ΔTad in the CMF is discussed in the context of the role of secondary phase localization, which leads to an enhanced internal local magnetic field and dynamic effects of ΔTad.

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1.2 T 循环磁场中 Fe50Rh50 合金绝热温度变化的频率稳定化

我们展示了在 1.2 T 循环磁场 (CMF) 中直接测量 Fe50Rh50 合金绝热温度变化 (ΔTad) 的结果。结果表明，随着 CMF 频率从 1 Hz 增加到 30 Hz，温度依赖性 ΔTad(T) 最大值 Tmax 的位置向低温移动。随着 CMF 频率从 1 赫兹提高到 5 赫兹，ΔTmax 值下降了 ∼12%。频率进一步提高后，效应趋于稳定。在反铁磁-铁磁相变点 TC = 370 K 附近，ΔTad 表现出非常规的频率行为：当 T 远高于 TC 时，ΔTad 的值随着频率的增加而单调降低，而在 T = 370.在 368 K < T < TC 时，ΔTad(f) 的最大值出现在 1 < f < 10 Hz 的区间内。由于 ΔTad 值大，而且在交变磁场中的频率稳定，这种行为将来可应用于磁制冷技术。比冷功率在 20 Hz 时达到了 ∼22 W/g 的巨值，与相同条件下 Gd 的值 -21.6 W/g 相当。在讨论 CMF 中 ΔTad 的非常规行为时，讨论了次相局部化的作用，次相局部化导致增强的内部局部磁场和 ΔTad 的动态效应。

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

Applied Physics Letters 物理-物理：应用

CiteScore

6.40

自引率

10.00%

发文量

1821

审稿时长

1.6 months

期刊介绍： Applied Physics Letters (APL) features concise, up-to-date reports on significant new findings in applied physics. Emphasizing rapid dissemination of key data and new physical insights, APL offers prompt publication of new experimental and theoretical papers reporting applications of physics phenomena to all branches of science, engineering, and modern technology. In addition to regular articles, the journal also publishes invited Fast Track, Perspectives, and in-depth Editorials which report on cutting-edge areas in applied physics. APL Perspectives are forward-looking invited letters which highlight recent developments or discoveries. Emphasis is placed on very recent developments, potentially disruptive technologies, open questions and possible solutions. They also include a mini-roadmap detailing where the community should direct efforts in order for the phenomena to be viable for application and the challenges associated with meeting that performance threshold. Perspectives are characterized by personal viewpoints and opinions of recognized experts in the field. Fast Track articles are invited original research articles that report results that are particularly novel and important or provide a significant advancement in an emerging field. Because of the urgency and scientific importance of the work, the peer review process is accelerated. If, during the review process, it becomes apparent that the paper does not meet the Fast Track criterion, it is returned to a normal track.