Chromium doped strontium hexaferrite nanoparticles was synthesized by the chemical sol–gel route, The crystalline structure, size and magnetic property of the particles were investigated by means of X-ray diffraction, transmission electron microscopy and vibrating sample magnetometry. Structural analysis has shown that the samples remain a hexagonal magnetoplumbite phase and FeCr2O4 appears, The lattice parameter a and c remains almost constant with the increase in the Cr content, because the radius of Cr3+ is similar to that of Fe3+ ion. The saturation magnetization, remanence and coercivity decrease with the increase substitution. for low substituted is an increase in saturation magnetization. This substituted due to low coercivity and good magnetization is suitable for high-density magnetic recording device

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