Аннотация:In this study, we demonstrate the synthesis and the investigation of the magnetostatic and magnetodynamic properties of single-domain gallium substituted strontium M-type hexaferrite particles SrFe12-xGaxO19 (x = 1 - 6). The synthetic approach is based on a precursor preparation via a facile citrate-nitrate auto-combusion method followed by thermal treatment at 1200 oC. The annealing of the porous precursor led to the formation of single-domain hexaferrite particles with mean sizes of 360 – 560 nm. Introduction of Ga3+ ions up to x = 4 into the hexaferrite structure resulted in a growth of coercivity from 5.1 to 6.4 kOe, and further increase in gallium concentration led to a decrease in the coercivity. The samples display natural ferromagnetic resonance frequency in the range of 49 – 57 GHz. Crystal structure refinement reveals, that Ga3+ ions preferably occupy 2a, 4f1, 12k, and 2b sites and cause a decrease in the magnetic anisotropy and a modest decrease in the saturation magnetization.