Abstract
Following our previous study on vacuum-evaporated Mn 2 Sb films with bismuth and chromium added, we have investigated the magnetic and magnetooptic properties of tin-substituted Mn 2 Sb (Mn 2 Sb 1-x Sn x ) films, with x varied from 0 to about 0.40 (13.2 at% Sn). Tin was chosen as the third element because there are two magnetic intermetallic compounds with different crystallographic structures in this system--Mn 2 Sb has a tetragonal structure, while Mn 2 Sn has a hexagonal structure. As the amount of tin substitution increases, the diffraction lines from Mn 2 Sb become weak and the saturation magnetization decreases, but perpendicular magnetization films can nonetheless be obtained up to x=0.40. Results show that shrinking along the c-axis of the Mn≪≪MDSD≫≫2≪≪MDNM≫≫Sb lattice occurs in the vicinity of x=0.15 (5 at% Sn), at which a decrease in coercivity and increase in polar Kerr rotation are observed. These are considered to be closely related phenomena, presumably reflecting a change in the electronic structure of Mn 2 Sb.
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