  Mn1.5X0.5Sn (X = Cr, Mn, Fe, Co) nanomaterials in the hexagonal Ni2In-type
crystal structure have been prepared using arc-melting and melt spinning. All
the rapidly quenched Mn1.5X0.5Sn alloys show moderate saturation magnetizations
with the highest value of 458 emu/cm3 for Mn1.5Fe0.5Sn, but their Curie
temperatures are less than 300 K. All samples except the Cr containing one show
spin-glass-like behavior at low temperature. The magnetic anisotropy constants
calculated from the high-field magnetization curves at 100 K are on the order
of 1 Merg/cm3. The vacuum annealing of the ribbons at 550 oC significantly
improved their magnetic properties with the Curie temperature increasing from
206 K to 273 K for Mn1.5Fe0.5Sn.
