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首页> 外文期刊>Journal of Physics, D. Applied Physics: A Europhysics Journal >Reproducible room temperature giant magnetocaloric effect in Fe-Rh
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Reproducible room temperature giant magnetocaloric effect in Fe-Rh

机译：Fe-Rh中可重现的室温巨磁热效应

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摘要

We present the results of magnetocaloric effect (MCE) studies in polycrystalline Fe-Rh alloy over a temperature range of 250-345K across the first order antiferromagnetic to ferromagnetic transition. By measuring the MCE under various thermomagnetic histories, contrary to the long held belief, we show here explicitly that the giant MCE in Fe-Rh near room temperature does not vanish after the first field cycle. In spite of the fact that the virgin magnetization curve is lost after the first field cycle near room temperature, reproducibility in the MCE under multiple field cycles can be achieved by properly choosing a combination of isothermal and adiabatic field variation cycles in the field-temperature phase space. This reproducible MCE leads to a large effective refrigerant capacity of 324.42 J kg(-1), which is larger than that of the well-known magnetocaloric material Gd5Si2Ge2. This information could be important as Fe-Rh has the advantage of having a working temperature of around 300 K, which can be used for room temperature magnetic refrigeration.
机译：我们介绍了在多级Fe-Rh合金中，在一阶反铁磁到铁磁过渡期间250-345K的温度范围内磁热效应（MCE）研究的结果。通过测量各种热磁历史下的MCE，与长期以来的信念相反，我们在这里明确表明，在室温附近的Fe-Rh中的巨型MCE在第一个磁场周期后不会消失。尽管在接近室温的第一个磁场周期后失去了原始的磁化曲线，但通过在磁场温度相中适当选择等温和绝热磁场变化周期的组合，可以在多个磁场周期下实现MCE的重现性。空间。这种可重现的MCE导致有效制冷剂容量为324.42 J kg（-1），这比众所周知的磁热材料Gd5Si2Ge2大。该信息可能很重要，因为Fe-Rh具有工作温度约为300 K的优势，可用于室温磁制冷。

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