Effect of Cu-Cr co-substitution on magnetic properties of nanocrystalline magnesium ferrite

► Mg1−xCuxCrxFe2−xO4 was synthesized by novel PEG assisted microemulsion method. ► Present paper dealt with magnetic properties of Mg1−xCuxCrxFe2−xO4. ► XRD patterns revealed tetragonal distorted cubic structure of Mg1−xCuxCrxFe2−xO4. ► Mossbauer spectroscopy confirmed that Cu-Cr occupy octahedral sites. ► High field regime of M-H loops was modeled using Law of Approach to saturation.