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Simple practical system for directly measuring magnetocaloric effects under large magnetic fields

Direct measurements of the adiabatic temperature change (ΔTad) in Gd and Mn1.15Fe0.8P0.5Si0.5C0.05 are made using a homemade adiabatic magnetocalorimeter at 260–360 K and 0–7 T. The system uses a servo motor to drive the samples into and out of the magnetic field under a vacuum environment provided...

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Bibliographic Details
Published in:Review of scientific instruments 2020-06, Vol.91 (6), p.065102-065102
Main Authors: Liu, J. Y., Zheng, Z. G., Lei, L., Qiu, Z. G., Zeng, D. C.
Format: Article
Language:English
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Summary:Direct measurements of the adiabatic temperature change (ΔTad) in Gd and Mn1.15Fe0.8P0.5Si0.5C0.05 are made using a homemade adiabatic magnetocalorimeter at 260–360 K and 0–7 T. The system uses a servo motor to drive the samples into and out of the magnetic field under a vacuum environment provided by the Physical Property Measurement System (PPMS). The peak values of ΔTad for Gd and Mn1.15Fe0.8P0.5Si0.5C0.05 at 7 T are 8.71 K and 6.41 K at ambient temperatures of 303 K and 317 K, respectively. Based on the theory model, it is found that ΔTad of Gd depends on the 2/3 exponential function of magnetic field H (ΔTad ∝ H2/3), whereas the Mn1.15Fe0.8P0.5Si0.5C0.05 compound follows the power law of ΔTad ∝ H0.66–1.04 due to the first order magnetic transitions. Furthermore, using the constructed experimental instrument, the adiabatic temperature change in different magnetic materials, including materials with first/second order magnetic transition and blocks, flakes, or powders, can be directly measured under large magnetic fields and wide temperature spans.
ISSN:0034-6748
1089-7623
DOI:10.1063/1.5128949