MAGNETOSTRUCTURAL TRANSITION IN HEUSLER Mn-Ni-In MELT-SPUN RIBBONS

摘要

The magnetostructural transition of Heusler Mn-Ni-In melt-spun ribbons was investigated in the present work. Experimental results show that the characteristic temperatures of martensitic transformation enhance with substituting Mn with Ni for constant indium levels in Mn_(50-x)Ni_(40+x)In_(10) (at.%, x=0,2,4) melt-spun ribbons. Meanwhile, the ribbons evolve from the bcc cubic L2_1-type structured austenite to fourteen-layered modulated (14M) monoclinic martensite at room temperature. The martensitic transformation happens prior to the magnetic transition of austenite in Mn_(46)Ni_(44)In_(10) and lead to a sharp decrease of magnetization discrepancy across the martensitic transformation. It is beneficial for the magnetic enhancement to keep high Mn content.