Effect of low temperature annealing on magneto-caloric effect of Ni–Mn–Sn–Al ferromagnetic shape memory alloy
Effect of low temperature annealing on magneto-caloric effect of Ni–Mn–Sn–Al ferromagnetic shape memory alloy
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DOI：
10.1016/j.jallcom.2015.04.069
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发表时间：
2015-08
影响因子：
6.2
通讯作者：
S. Agarwal;E. Stern-Taulats;L. Mañosa;P. Mukhopadhyay
中科院分区：
文献类型：
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作者：
S. Agarwal;E. Stern-Taulats;L. Mañosa;P. Mukhopadhyay
我们研究了低温退火对样品的原子有序性的影响以及由此引起的磁化强度和磁热效应的变化。较低温度下的退火最初降低了样品的磁化强度和磁热效应，但较高温度下样品的磁化强度和磁热效应都有所增加。磁化强度和磁热效应的变化是由原子有序的变化引起的。结果表明，淬火后热处理为优化合金的磁热效应提供了一种简便的方法。为了验证磁热效应的测量没有高估，我们还进行了内场量热测量，并将其与磁化强度测量结果进行了比较。我们没有发现他们之间的显著差异。
We studied the effect of low temperature annealing on the atomic ordering and consequent changes in the magnetization and magnetocaloric effect of the sample. The annealing at lower temperatures initially decreased the magnetization and magnetocaloric effect in the sample, but at higher annealing temperatures both increased. The changes in magnetization and magnetocaloric effect arise from the change in atomic ordering. We have shown that post quenching heat treatment offers easy way of optimizing the alloy for magnetocaloric effect. In order to verify that there was no overestimation in the measurement of magnetocaloric effect we also performed an infield calorimetric measurements and compared them with those from the magnetization measurements. We did not find remarkable difference between them.