We report the results of studies of the magnetic and transport properties of Fe₄₉Rh₅₁ alloy prepared by different sequences of quenching and the annealing process. The temperature dependences of the relative initial magnetic permeability and resistivity are analyzed. An optimal regime consisting of annealing at 1300 K for 440 min and quenching from 1300 K to 275 K is found to observe the desired narrow antiferromagnetic–ferromagnetic transition in Fe₄₉Rh₅₁ alloy under cyclic conditions. This has the potential to increase the efficiency of cooling devices based on the magnetocaloric effect of magnetic materials with a first-order field-induced phase transition.

中文翻译：

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Fe49Rh51合金退火工艺的热滞控制

我们报告了通过不同的淬火和退火工艺顺序制备的Fe ₄₉ Rh ₅₁合金的磁性和输运性能的研究结果。分析了相对初始磁导率和电阻率的温度依赖性。发现了一种最佳方案，其中包括在1300 K退火440分钟和从1300 K淬火到275 K的淬火过程，可以观察到在循环条件下Fe ₄₉ Rh ₅₁合金中所需的窄反铁磁-铁磁过渡。基于具有一阶场致相变的磁性材料的磁热效应，这具有提高冷却装置效率的潜力。