Hard soft ferrite nanocomposites (NCs) (SrHF)/xMCD (1.0 <= x <= 3.0) consisting of SrFe12O19 HF (SrHF) and Mg0.5Cd0.5Dy0.03Fe1.97O4 (MCD) were obtained via one-pot sol-gel auto-combustion approach. The measurements of impedance spectroscopy are presented for new fractional (SrHF)/xMCD (1.0 <= x <= 3.0) hard soft ferrite NCs, including reference soft and hard ferrites. The electrical conductivity and activation energies of fractional composite ferrites are observed to be regulated depending on the fractional ratios. It has been established that the temperature dependence of the DC conductivity obeys the Arrhenius law, especially for the fractional composite ferrites. To control the conduction mechanism, the conductivity and its frequency power exponent are evaluated based on a small polaron tunnelling model. Magnetic properties were verified by applying a DC magnetic field up to +/- 70 kOe at 300 and 10 K. Magnetization data significantly decreased with increasing fraction of MCD in NCs. These results showed that exchange-coupling was not achieved in these NCs by one-pot approach. Additionally, anticandidal activity of the synthesized nanomaterials was studied by evaluating the colony forming unit (CFU). The obtained results are significant for potential applications in the field of biomedicine. (C) 2020 Taiwan Institute of Chemical Engineers. Published by Elsevier B.V. All rights reserved.