Peculiarities of the microwave properties of hard–soft functional composites SrTb 0.01 Tm 0.01 Fe 11.98 O 19 –AFe 2 O 4 (A = Co, Ni, Zn, Cu, or Mn)

Hz frequency range at 20-120 °C. Frequency dependency of microwave properties were investigated using the coaxial method in frequency range of 2-18 GHz. The non-linear behavior of the main microwave properties with a change in composition may be due to the influence of the soft magnetic phase. It was found that Mn- and Ni-spinel ferrites achieved the strongest electromagnetic absorption. This may be due to differences in the structures of the electron shell and the radii of the A-site ions in the spinel phase. It was discovered that the ionic polarization transformed into the dipole polarization.