In this study the magnetic nanoparticles of Co1-XZnXFe2O4 were prepared with different X values (X = 0, 0.1, 0.3, 0.5, 0.7 and 0.9 respectively), using co-precipitation method. The ferrites with a Nano scale was ranging from (10 to28 nm), and the structural properties were tasted prepared samples using X-ray diffraction (XRD), and field emission scanning electron microscopy (FESEM). The structural results showed that the particles have a cubic spindle phase and that the particles have a Nano scale, with a clear agglomeration between the particles sites Finally, the magnetic properties tests showed that the particles have high magnetic saturation.

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In this study, Nickel Zinc Ferrite was prepared using the co-precipitation method according to the chemical formula Ni1-xZnxFe2O4, where the values of (x = 0,0.1,0.3,0.5,0.7,0.9) respectively, the structural and magnetic properties were studied through X-ray diffraction spectroscopy. FESEM showed the porosity and distribution of the homogeneous nanoparticles roughly, also its particle size. The vibration sample Magnetometer (VSM)was used to study magnetic properties, and the Fourier transform infrared (FTIR) spectra were measured in the range of 400-4000 cm−1. Magnetic nanoparticles effect on contrast factors in magnetic resonance imaging (MRI) images was studied, it showed Good and robust imaging technique for diagnosis and post-treatment evaluation for a wide range of diseases. MRI contrast can be enhanced by using negative or positive contrast agents, resulting in clearer (T1-weighted) or darker (T2-weighted) images, respectively, with super-magnetic nanoparticles yielding T2 contrast agents widely used in molecular imaging applications and cellular. As most of the work in this field focuses on the acquisition of biological species using nanoparticles, which in turn will improve the magnetic properties that lead to higher imaging.

The undoped CuO and CuO:Co films are grown using spray pyrolysis technique(SPT). The deposited films undergo a clear morphological change due to an increase in Cobalt dopant from 0 to 4 %. The predominant peak was (200) plane has been confirmed by Xray diffraction. Maximum crystalline size was at the (CuO: 4% Co) film, and the strain decreases from 2.98 to 2.59. Study of the morphology specifies the presence of homogeneous grains, these grains were not homogeneous and had different sizes by adding Co atom. AFM images a reduction in roughness from (7.06 to 3.64) nm. The crystallite size was in the area of 41.35 nm to 32.46 nm as calculated by Scherrer’s formula. The average transmittance values for the films were (77, 74 and 71) % for Undoped CuO, CuO: 2% Co and CuO: 4% Co respectively. The optical energy gaps of the films were calculated. the absorption coefficient increased with an increase at 2% or 4% Cobalt dopant, the band gap of Undoped CuO sample was 2.12 eV, and then decreased slightly with Cobalt content to become 2.04 eV for CuO: 2% Co and 2.04 eV for CuO: 4% Co. also The refractive index and extinction coefficient increased via Cobalt contents.

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