Magnetostructural transformation and magnetocaloric effect in Mn-Ni-Sn melt-spun ribbons

The martensitic transformation and magnetic properties of Mn50Ni50-xSnx(7≤x≤10)\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$(7\le x\le 10)$\end{document} melt-spun ribbons were investigated. It is shown that the increase of Sn content results in a nearly linear decrease of martensitic transformation temperatures in the ribbons, with an average rate of 70 K per at % of Sn. In Mn50Ni40Sn10 ribbons, the field-induced reverse martensitic transformation from a weak magnetic martensite to a ferromagnetic austenite was realized due to the strong magnetostructural coupling. Under a field change of 5T, the large magnetic entropy change of 13.7 J kg-1K-1 and the effective refrigerant capacity of 72.9 Jkg-1 were obtained in Mn50Ni40Sn10 ribbons.