Tuning sign and intensity of magnetocaloric effect by co doping NiMnGa alloys

Fabbrici, S.; Kamarad, J.; Arnold, Z.; Paoluzi, A.; Bolzoni, F.; Cabassi, R.; Casoli, F.; Solzi, Massimo; Porcari, Giacomo; Pernechele, Chiara; Albertini, F.

We studied the composition dependence of the critical temperatures and of the magnetocaloric properties of Co doped NiMnGa alloys around the Mn-rich composition Ni50Mn30Ga20. By varying the Co and Mn content we have been able to tune the critical temperatures and to obtain a complete reverse martensitic transformation between paramagnetic martensite and ferromagnetic austenite. Unlike the Co-free alloys, high values of inverse magnetocaloric effect are associated to such a reverse transformation. The possibility to change the sign of the magnetocaloric effect by stoichiometric control of NiCoMnGa makes these materials interesting for magnetic refrigeration applications.

Titolo:	Tuning sign and intensity of magnetocaloric effect by co doping NiMnGa alloys
Autori:	S. Fabbrici J. Kamarad Z. Arnold A. Paoluzi F. Bolzoni R. Cabassi F. Casoli SOLZI, Massimo PORCARI, Giacomo PERNECHELE, Chiara F. Albertini mostra contributor esterni nascondi contributor esterni
Data di pubblicazione:	2012
Abstract:	We studied the composition dependence of the critical temperatures and of the magnetocaloric properties of Co doped NiMnGa alloys around the Mn-rich composition Ni50Mn30Ga20. By varying the Co and Mn content we have been able to tune the critical temperatures and to obtain a complete reverse martensitic transformation between paramagnetic martensite and ferromagnetic austenite. Unlike the Co-free alloys, high values of inverse magnetocaloric effect are associated to such a reverse transformation. The possibility to change the sign of the magnetocaloric effect by stoichiometric control of NiCoMnGa makes these materials interesting for magnetic refrigeration applications.
Handle:	http://hdl.handle.net/11381/2425997
ISBN:	9781618397591
Appare nelle tipologie:	2.1 Contributo in volume(Capitolo di libro)

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