a Department of Physics, Vel Tech Rangarajan Dr. Sagunthala R&D Institute of Science and Technology, Vel Nagar, Avadi, Chennai-600 062, Tamil Nadu, India b PG & Research Department of Physics, Arignar Anna College (Arts & Science), Krishnagiri-635115, Tamilnadu, India

c Chemistry Department, College of Science, King Saud University, P.O.

Box.2455, Riyadh 11451, Saudi Arabia

d Department of Nanotechnology, Noorul Islam Centre for Higher Education,

Kumaracoil, Kanyakumari 629180, Tamilnadu, India.

e PG & Research Department of Physics, Paavendhar College of Arts & Science,

M. V. South, Thalaivasal, Salem, Tamil Nadu 636 121, India

f School of Materials Science and Engineering, Hunan University, Changsha,

Hunan, 410082, China

The synthesis of Zn1-x-yCoxNiyFe2O4 (0 ≤ x & y ≤ 0.25) nanoparticles has been carried out using a microwave combustion technique. The X-ray diffraction analysis of ZnFe2O4 samples, as well as ZnFe2O4 samples doped with Co2+ and Ni2+, indicated the presence of a spinel structure with a crystallite size ranging from 11 to 29 nm. The lattice and crystallite were established using XRD analysis. The FE-SEM picture reveals a uniform grain morphology. The UV-Vis spectra indicated a rise in band gap values along with an increase in the concentration of Co2+ and Ni2+ . The VSM spectra demonstrate ferromagnetic behaviour in all of the samples.