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Giant magnetocaloric effect driven by structural transitions

Liu, Jian ; Gottschall, Tino ; Skokov, Konstantin P. ; Moore, James D. ; Gutfleisch, Oliver (2012)
Giant magnetocaloric effect driven by structural transitions.
In: Nature Materials, 11 (7)
doi: 10.1038/nmat3334
Artikel, Bibliographie

Kurzbeschreibung (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.

Typ des Eintrags: Artikel
Erschienen: 2012
Autor(en): Liu, Jian ; Gottschall, Tino ; Skokov, Konstantin P. ; Moore, James D. ; Gutfleisch, Oliver
Art des Eintrags: Bibliographie
Titel: Giant magnetocaloric effect driven by structural transitions
Sprache: Englisch
Publikationsjahr: 2012
Verlag: Nature Publishing Group
Titel der Zeitschrift, Zeitung oder Schriftenreihe: Nature Materials
Jahrgang/Volume einer Zeitschrift: 11
(Heft-)Nummer: 7
DOI: 10.1038/nmat3334
Kurzbeschreibung (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.

Freie Schlagworte: Magnetic materials, Nanoscale materials
Fachbereich(e)/-gebiet(e): 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft > Fachgebiet Funktionale Materialien
11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft
11 Fachbereich Material- und Geowissenschaften
Hinterlegungsdatum: 22 Apr 2013 08:33
Letzte Änderung: 22 Apr 2013 08:33
PPN:
Sponsoren: 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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