The Magnetic Structure of FeSb2O4

The magnetic structure of Fe${\mathrm{Sb}}_2$ ${\mathrm{O}}_4$ at 4.2°K has been investigated by powder neutron-diffraction techniques. The spin arrangement is noncollinear, consisting of a combination of three different antiferromagnetic modes. The principal mode ($A$) is one in which the ${\mathrm{Fe}}^{2+}$ moments are parallel within a given (001) layer, with adjacent layers coupled antiparallel, the moments being directed perpendicular to the tetragonal$c$ axis. However, from the data it is not possible to specify the relative directions of the secondary modes ($G$ and $C$). The value of the resultant moment is approximately ${3.8}_{\mathrm{\mu }\mathit{B}}$ per ${\mathrm{Fe}}^{2+}$ ion.