Effect Of 120 MeV 28Si9+ Ion Irradiation On Structural And Magnetic Properties Of NiFe2O4 And Ni0.5Zn0.5Fe2O4

NiFe2O4, Ni0.5Zn0.5Fe2O4 samples were synthesized using sol-gel auto combustion method, and irradiated by using 120 MeV Si-28(9+) ion with ion fluence of 1x10(12) ions/cm(2). Characterization of pristine, irradiated samples were done using X-Ray Diffraction (XRD), Field Emission Scanning Microscopy (FE-SEM), Energy Dispersive X-ray Analysis (ED Lambda X) and Vibrating Sample Magnetometer (VSM). XRD validates the single phase nature of pristine, irradiated Ni-Zn nano ferrite except for Ni ferrite (pristine, irradiated) where secondary phases of alpha-Fe2O3 and Ni is observed. FE-SEM images of pristine Ni, Ni-Zn ferrite show inhomogeneous nano-range particle size distribution. Presence of diamagnetic ion (Zn2+) in NiFe2O4 increases oxygen positional parameter (u (4) over bar 3m), experimental, theoretical saturation magnetization (M-s(exp), M-s(th)), while decreases the grain size (D-s) and coercivity (H-c). With irradiation M-s(exp), M-s(th) increases but not much change are observed in H-c. New antistructure modeling for the pristine, irradiated Ni and Ni-Zn ferrite samples was used for describing the surface active centers.