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Overview of the characteristic features of the magnetic phase transition with regards to the magnetocaloric effect: the hidden relationship between hysteresis and latent heat

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posted on 16.04.2015 by Kelly Morrison, L.F. Cohen
The magnetocaloric effect has seen a resurgence in interest over the last 20 years as a means towards an alternative energy efficient cooling method. This has resulted in a concerted effort to develop the so-called “giant” magnetocaloric materials with large entropy changes that often come at the expense of hysteretic behavior. But do the gains offset the disadvantages? In this paper, we review the relationship between the latent heat of several giant magnetocaloric systems and the associated magnetic field hysteresis. We quantify this relationship by the parameter Δμ 0 H/ΔS L, which describes the linear relationship between field hysteresis, Δμ 0 H, and entropy change due to latent heat, ΔS L. The general trends observed in these systems suggest that itinerant magnets appear to consistently show large ΔS L accompanied by small Δμ 0 H (Δμ 0 H/ΔS L = 0.02 ± 0.01 T/(J K−1 kg−1)), compared to local moment systems, which show significantly larger Δμ 0 H as ΔS L increases (Δμ 0 H/ΔS L = 0.14 ± 0.06 T/(J K−1 kg−1)).

Funding

L. F. C. acknowledges funding for this work from EPSRC EP/G060940/1.

History

School

  • Science

Department

  • Physics

Published in

Metallurgical and Materials Transactions E

Volume

1

Issue

2

Pages

153 - 159

Citation

MORRISON, K. and COHEN, L.F., 2014. Overview of the characteristic features of the magnetic phase transition with regards to the magnetocaloric effect: the hidden relationship between hysteresis and latent heat. Metallurgical and Materials Transactions E, 1 (2), pp. 153 - 159.

Publisher

Springer / © The Minerals, Metals & Materials Society and ASM International

Version

AM (Accepted Manuscript)

Publisher statement

This work is made available according to the conditions of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0) licence. Full details of this licence are available at: https://creativecommons.org/licenses/by-nc-nd/4.0/

Publication date

2014

Notes

This article was published in the journal, Metallurgical and Materials Transactions E [Springer / © The Minerals, Metals & Materials Society and ASM International]. The final publication is available at Springer via http://dx.doi.org/10.1007/s40553-014-0015-8

ISSN

2196-2936

Language

en

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