High-throughput direct measurement of magnetocaloric effect based on lock-in thermography technique
High-throughput direct measurement of magnetocaloric effect based on lock-in thermography technique
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DOI：
10.1063/1.5000970
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发表时间：
2017-10
影响因子：
4
通讯作者：
Y. Hirayama;R. Iguchi;X. Miao;K. Hono;K. Uchida
中科院分区：
文献类型：
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作者：
Y. Hirayama;R. Iguchi;X. Miao;K. Hono;K. Uchida
我们展示了一个高通量的磁热效应（MCE）的直接测量方法，通过锁定热成像（LIT）技术。这种方法能够系统地测量磁场和工作频率的温度变化引起的MCE的依赖性。与传统的绝热温度测量方法相比，这在更短的时间内完成。基于LIT的直接测量不存在任何可能的错误计算和使用热力学关系的间接测量所产生的误差。重要的是，LIT技术可以在不增加测量时间的情况下同时对多种材料进行MCE测量，从而实现MCE的高通量研究。将此方法应用于Gd，在300.5 ± 0.5K温度下，在1.0T调制场和0.5Hz调制频率下，得到了1.84 ± 0.11K的MCE诱导温度变化，证明了LIT方法给出了定量结果。
We demonstrate a high-throughput direct measurement method for the magnetocaloric effect (MCE) by means of a lock-in thermography (LIT) technique. This method enables systematic measurements of the magnetic-field and operation-frequency dependences of the temperature change induced by the MCE. This is accomplished in a shorter time compared to conventional adiabatic temperature measurement methods. The direct measurement based on LIT is free from any possible miscalculations and errors arising from indirect measurements using thermodynamic relations. Importantly, the LIT technique makes simultaneous MCE measurements of multiple materials possible without increasing the measurement time, realizing high-throughput investigations of the MCE. By applying this method to Gd, we obtain the MCE-induced temperature change of 1.84 ± 0.11 K under a modulation field of 1.0 T and modulation frequency of 0.5 Hz at a temperature of 300.5 ± 0.5 K, offering evidence that the LIT method gives quantitative results.