ИСТИНА

M-type hexaferrites is known to be sensitive to thier chemical composition, which can be an effective instrument to preciesly control magnetic properties of the materials. 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. The research was supported by RFBR grant no 21-53-12002.