  The magnetic properties of the alloy system Fe3-xMnxSi have been studied by
measuring magnetization for samples with x = 0, 0.1, 0.25, 0.5, and by thermal
scanning techniques for samples with x = 0, 0.1. The results reveal that the
system is ferromagnetic in this composition range. Zero field cooling and field
cooling magnetization measurements indicate a similar magnetic ordering and
magnetic anisotropy in all samples. The saturation magnetization for the
annealed samples was higher than that for as prepared samples. This is
attributed to the reduction of magnetic domain boundaries rather than to
improving magnetic order as a result of annealing. Further, TC values
determined from thermal DSC measurements are in good agreement with previously
reported results based on magnetic measurements.
