On correctly assessing the reversibility of the magnetocaloric effect from indirect measurements
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arXiv
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| Main Authors: | , , , |
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| Format: | Preprint |
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2024
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| _version_ | 1866916117830696960 |
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| author | Kiefe, R. Almeida, R. Belo, J. H. Amaral, J. S. |
| author_facet | Kiefe, R. Almeida, R. Belo, J. H. Amaral, J. S. |
| contents | 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. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2402_04940 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | On correctly assessing the reversibility of the magnetocaloric effect from indirect measurements Kiefe, R. Almeida, R. Belo, J. H. Amaral, J. S. Materials Science 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. |
| title | On correctly assessing the reversibility of the magnetocaloric effect from indirect measurements |
| topic | Materials Science |
| url | https://arxiv.org/abs/2402.04940 |