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We report on the synthesis and structural characterization of themagnetocaloric FeMnP$_{0.75}$Si$_{0.25}$ compound. Two types of samples (asquenched and annealed) were synthesized and characterized structurally andmagnetically. We have found that minute changes in the degree ofcrystallographic order causes a large change in the magnetic properties. Theannealed sample, with higher degree of order is antiferromagnetic with a zeronet moment. The as-quenched sample has a net moment of 1.26 $\mu_B$/f.u. andferrimagnetic-like behavior. Theoretical calculations give rather large valuesfor the Fe and Mn magnetic moments, both when occupied on the tetrahedral andpyramidal lattice site. The largest being the Mn moment for the pyramidal sitereaches values as high as 2.8 $\mu_B$/atom.

Order--disorder induced magnetic structures of FeMnP$_{0.75}$Si$_{0.25}$