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Giant magnetocaloric effect driven by structural transitions

Liu, Jian and Gottschall, Tino and Skokov, Konstantin P. and Moore, James D. and Gutfleisch, Oliver (2012):
Giant magnetocaloric effect driven by structural transitions.
In: Nature Materials, Nature Publishing Group, pp. 620-626, 11, (7), ISSN 1476-1122, [Online-Edition: http://dx.doi.org/10.1038/nmat3334],
[Article]

Abstract

Magnetic cooling could be a radically different energy solution substituting conventional vapour compression refrigeration in the future. For the largest cooling effects of most potential refrigerants we need to fully exploit the different degrees of freedom such as magnetism and crystal structure. We report now for Heusler-type Ni–Mn–In–(Co) magnetic shape-memory alloys, the adiabatic temperature change ΔTad = −3.6 to −6.2 K under a moderate field of 2 T. Here it is the structural transition that plays the dominant role towards the net cooling effect. A phenomenological model is established that reveals the parameters essential for such a large ΔTad. We also demonstrate that obstacles to the application of Heusler alloys, namely the usually large hysteresis and limited operating temperature window, can be overcome by using the multi-response to different external stimuli and/or fine-tuning the lattice parameters, and by stacking a series of alloys with tailored magnetostructural transitions.

Item Type: Article
Erschienen: 2012
Creators: Liu, Jian and Gottschall, Tino and Skokov, Konstantin P. and Moore, James D. and Gutfleisch, Oliver
Title: Giant magnetocaloric effect driven by structural transitions
Language: English
Abstract:

Magnetic cooling could be a radically different energy solution substituting conventional vapour compression refrigeration in the future. For the largest cooling effects of most potential refrigerants we need to fully exploit the different degrees of freedom such as magnetism and crystal structure. We report now for Heusler-type Ni–Mn–In–(Co) magnetic shape-memory alloys, the adiabatic temperature change ΔTad = −3.6 to −6.2 K under a moderate field of 2 T. Here it is the structural transition that plays the dominant role towards the net cooling effect. A phenomenological model is established that reveals the parameters essential for such a large ΔTad. We also demonstrate that obstacles to the application of Heusler alloys, namely the usually large hysteresis and limited operating temperature window, can be overcome by using the multi-response to different external stimuli and/or fine-tuning the lattice parameters, and by stacking a series of alloys with tailored magnetostructural transitions.

Journal or Publication Title: Nature Materials
Volume: 11
Number: 7
Publisher: Nature Publishing Group
Uncontrolled Keywords: Magnetic materials, Nanoscale materials
Divisions: 11 Department of Materials and Earth Sciences > Material Science > Functional Materials
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences
Date Deposited: 22 Apr 2013 08:33
Official URL: http://dx.doi.org/10.1038/nmat3334
Identification Number: doi:10.1038/nmat3334
Funders: The research leading to these results has received financial support from Deutsche Forschungsgemeinschaft (SPP 1239) and the European Community’s 7th Framework Programme under grant agreement No. 214864 (SSEEC).
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