High-throughput direct measurement of magnetocaloric effect based on lock-in thermography technique

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...

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Bibliographic Details
Published in:Applied physics letters 2017-10, Vol.111 (16)
Main Authors: Hirayama, Yusuke, Iguchi, Ryo, Miao, Xue-Fei, Hono, Kazuhiro, Uchida, Ken-ichi
Format: Article
Language:English
Subjects:
Applied physics
Gadolinium
Measurement methods
Modulation
Temperature measurement
Thermography
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Summary: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.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.5000970