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Title: Overview of the characteristic features of the magnetic phase transition with regards to the magnetocaloric effect: the hidden relationship between hysteresis and latent heat
Authors: Morrison, Kelly
Cohen, L.F.
Issue Date: 2014
Publisher: Springer / © The Minerals, Metals & Materials Society and ASM International
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.
Abstract: 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)).
Description: 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
Sponsor: L. F. C. acknowledges funding for this work from EPSRC EP/G060940/1.
Version: Accepted for publication
DOI: 10.1007/s40553-014-0015-8
URI: https://dspace.lboro.ac.uk/2134/17281
Publisher Link: http://dx.doi.org/10.1007/s40553-014-0015-8
ISSN: 2196-2936
Appears in Collections:Published Articles (Physics)

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