This article reports synthesis and extensive investigation of multiferroic composite of KBiFe2O5 (KBFO)-CuFe2O4 (CUF) prepared by the citric acid sol-gel auto combustion method with different compositional ratios of \(\:0\le\:x\le\:1\) . Electric, magnetic, dielectric and magnetodielectric (MD) properties were investigated over the wide temperature ranges (30 –550 °C) and wide frequency ranges (100 − 1 \(\:Hz\:\) \(\:MHz\) ). The Rietveld refinement of XRD data confirms the phase formation and purity of the composite. The real and imaginary parts of impedance and the electric modulus were studied to conjecture the time relaxation process. The surface morphology reveals the average grain size of the composite in the 1.76-0.94 \(\:\mu\:m\) range. Composite \(\:x=0.3\) shows significantly improved dielectric values \(\:\:24.50\times\:{10}^{6}\) . The room temperature (RT) magnetic property reveals that ferrimagnetic CUF influences the magnetic property of the composite. The fitting parameters reveal the highest \(\:{M}_{R}\) = 0.0086 ± 0.0013 emu/g for the x = 0.3 composite and \(\:{H}_{C}\) = 544 ± 50 Oe for the x = 0.4 composite. Temperature and frequency-dependent electronic property investigated by Jonscher power law fitting, which provides insight into the conduction mechanism and activation energy of the prepared composites. The MD coupling behavior is studied at RT in a magnetic field up to ±13 kOe at 10, 30, and 50 kHz frequencies. The x=0.2 composite is a well-closed MD loop in field variation. However, the x = 0.3 composition produces the highest 12% MD coupling. This indicates strong strain-mediated coupling interaction suggests a promising candidate for low-field-controlled multifunctional devices, including magnetoelectric sensors and non-volatile memory elements.
