Reverse magnetostructural transformation in Co-doped NiMnGa multifunctional alloys

Fabbrici, S.; Albertini, F.; Paoluzi, A.; Bolzoni, F.; Cabassi, R.; Solzi, M.; Righi, L.; Calestani, G.
July 2009
Applied Physics Letters;7/13/2009, Vol. 95 Issue 2, p022508
Academic Journal
We studied the composition dependence of the structural and magnetic properties of Co-doped Ni–Mn–Ga alloys around the Mn-rich composition Ni50Mn30Ga20. By varying the Co and Mn content we have been able to tune the critical temperatures. In particular, in a suitable composition range, the Curie temperature of martensite is lower than Curie temperature of austenite and lower than martensitic transformation temperature, giving rise to a paramagnetic gap between magnetically ordered martensite and austenite and to the occurrence of a reverse magnetostructural transformation.


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