A comprehensive study on structural, magnetic and dielectric properties of Ni0.3Cu0.3Zn0.4Fe1.8Cr0.2O4 nanoparticles synthesized by sol-gel auto combustion route

•Reporting the new auto combustion synthesized Ni0.3Cu0.3Zn0.4Fe1.8Cr0.2O4 compound.•Evaluation of microstructural parameters in details is performed and discussed.•Variation between the magnetic properties due to particle size effect is discussed.•High values of MS(50.01 (emu/g),HC(44.06 Oe), andMr(1.92 emu/g) are reported.•Outstanding properties of NCZF NPs suggest their use in multi-layer chip inductors.