Keywords: Structural and magnetic properties,sol-gel auto-combustion method, Ni 0.5 Zn 0.5 Sm x Fe 2-x O 4 nanoferrite Abstract. Samarium ion substituted magnesium of Ni 0.5 Zn 0.5 Sm x Fe 2-x O 4 spinel ferrite powders have been prepared by a sol-gel auto-combustion method. XRD results indicate that the production of a single cubic phase of ferrites. Some particles are agglomerated due to the presence of magnetic interactions among particles. The Mössbauer spectra of Ni 0.5 Zn 0.5 Sm x Fe 2-x O 4 nanocrystalline at room temperature show that the magnetic interaction and interface atomic state were influenced strongly by Sm 3+ ratio, and the saturation magnetization of a spinel ferrite largely also depends on Sm 3+ ratio and particle size, while the coercive field depends on Sm 3+ ratio, particle size and their shapes. The SEM micrographs indicate that the Nanocrystalline Particles' specific features and characteristics.

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