Probe Mössbauer Study of Magnetically Ordered Manganite $${\text{ScMn}}_{{{\text{0}}{\text{.996}}}}^{{{\text{57}}}}{\text{F}}{{{\text{e}}}_{{{\text{0}}{\text{.004}}}}}{{{\text{O}}}_{{\text{3}}}}$$

Magnetic hyperfine interactions of 57Fe probe Mössbauer nuclei introduced into the ScMnO3 manganite lattice with a hexagonal crystal lattice have been studied for the first time. Based on the data obtained, the valence state of the probe iron atoms, their local crystal environment, and the orientation of magnetic Fe3+ cations in the $${\text{ScMn}}_{{{\text{0}}{\text{.996}}}}^{{{\text{57}}}}{\text{F}}{{{\text{e}}}_{{{\text{0}}{\text{.004}}}}}{{{\text{O}}}_{{\text{3}}}}$$ structure in a magnetically ordered state at T < TN have been determined. Within the framework of the stochastic relaxation model, the temperature dependence of the Zeeman structure of the 57Fe spectra has been analyzed, which has yielded new data on the frustrated Fe−O−Mn exchange interactions. The critical indices of the power-law dependence of the hyperfine magnetic field Hhf(T) on 57Fe nuclei have been determined, indicating a reduced dimensionality of the magnetic subsystem of the magnetically ordered manganite $${\text{ScMn}}_{{{\text{0}}{\text{.996}}}}^{{{\text{57}}}}{\text{F}}{{{\text{e}}}_{{{\text{0}}{\text{.004}}}}}{{{\text{O}}}_{{\text{3}}}}$$ .