On correctly assessing the reversibility of the magnetocaloric effect from indirect measurements

2024/02/07 by R. Kiefe, Kiefe, R., R. Almeida +5
Materials Science · #FOS: Physical sciences #Magnetic and transport properties of perovskites and related materials #Materials Science (cond-mat.mtrl-sci)

paper · pdf · doi:10.48550/arxiv.2402.04940

openalex publication_date 2024/02/07 · openalex created_date 2024/02/09 · openalex updated_date 2026/08/01

Abstract

The adiabatic temperature change (ΔT_ad) of a magnetic refrigerant can be indirectly estimated through field (H) and temperature (T) dependent magnetization (M) and specific heat (C_p) measurements. A direct integration approach for this estimation is frequently reported, which is an approximation to a rigorous mathematical approach. In this work, we propose an iterative method in small H steps, to estimate ΔT_ad from indirect measurements. We show that this approach is able to reproduce the reversibility of the magnetocaloric effect, and provides a more accurate estimation of ΔT_ad, up to 10% when considering a detailed M(H,T) and Cp(H,T) dataset that reproduces the magnetothermal properties of gadolinium, a benchmark room-temperature magnetic refrigerant.

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