Thermal annealing effects on structural and magnetic properties of Fe_(46)Mn_(26)Ga_(28) ferromagnetic shape memory alloys

摘要

Annealing plays an important role to adjust structures and properties of ferromagnetic shape memory alloys. Thermal annealing effects on structural and magnetic properties of Fe_(46)Mn_(26)Ga_(28) FSMA have been investigated at different temperatures. Rietveld refinements of neutron diffraction patterns display that the formation of the γ phase in Fe_(46)Mn_(26)Ga_(28) annealed at 1073 K is Fe-rich Ga-poor cubic phase. The atomic occupancies of the alloys are determined due to the neutron's capability of differentiating transition metals. Different annealing treatment introduces magnetic characteristic that is associated with distinctive structural changes in crystal.