The martensitic transformation, magnetocaloric effect, and magnetoresistance in high-Mn content Mn_(47+x)Ni_(43_x)Sn_(10) ferromagnetic shape memory alloys

摘要

A series of high-Mn content Mn_(47+x)Ni_(43_x)Sn_(10) (x=0, 1, 2, 3, 4, and 5) ferromagnetic shape memory alloys were prepared by arc melting method. The martensitic transformation were observed in these alloys, even the content of Mn is higher than 50 at. %. The phase transition temperature of these alloys can be adjusted by tuning the compositions of Ni and Mn. Large positive magnetic entropy change and negative magnetoresistance which originate from the magnetic-field-induced martensitic transformation are obtained in these alloys.