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EnglishWe 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: | |
| 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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