The current work mainly focused on the synthesis, structural, electrical, and magnetic characterization of Sr1 − XLaXFe12O19 (X = 0.2–0.8) (SLFO) nanoparticles synthesized via the hydrothermal reaction technique. The hexagonal crystalline planes were determined using X-ray diffraction analysis. The obtained results indicated that the lattice constants were noted to be increasing from 0.58801 to 0.58825 nm (a = b), and 2.30309 to 2.30341 nm (c) with increase of ‘X’. The morphological studies ensured that the grains as well as nanoparticles of SLFO acquired almost spherical shape. The optical properties were investigated using FTIR and UV-Visible spectra. The optical bandgap (Eg) of SLFO was found to be increasing from 1.866–2.118 eV with dopant content. The electrical properties of SLFO were studied in detail as a function of temperature, and frequency. In addition, the dielectric modulus, and impedance spectroscopy analysis was carried out to describe the space charge polarization, and electric conduction mechanism respectively. The hysteresis loop (M-H curves) of SLFO revealed the decrease of magnetization from 36.34–7.17 emu/g with ‘X’.
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