Swift heavy ion irradiation induced modifications in magnetic and dielectric properties of Mn-Ca ferrite

► Effects of 200 MeV Ag15+ ion irradiation of nanocrystalline Mn-Ca ferrite investigated using utmost techniques. ► Characterization results confirmed formation of cubic spinel structure and spherical morphology consistent with the crystalline diameter. ► After irradiation, the saturation magnetization, coercivity, and blocking temperature enhance appreciably. ► SHI irradiation induced modifications in surface states of the nanoparticles and cationic re-distribution identified as probable reasons. ► Irradiation caused increase in dielectric constant, attributed to surface modifications through slight crystal growth.