Magnetic structure of Fe_0.9Mn_0.9Ge

The magnetic structure of Fe_0.9Mn_0.9Ge was studied on a single crystal by neutron and X-ray diffraction. The crystal structure of the hexagonal B8₂ and the room temperature data indicated the distribution of metal atoms to be 0.83 Mn + 0.12 Fe + 0.05 hole in the 2(a) site and 0.78 Fe + 0.07 Mn + 0.15 hole in the 2(d) site. Low temperature data at 103°K were analyzed by assuming a general model, from which four possible structures with non-collinear spins were found. These gave the same net magnetic moment per molecule of 1.66μ_B. Magnetization measurements yielded the Curie point at 241°K and the moment of 1.39 μ_B.