Abstract
In this paper, we reported a comparative study of structural and magnetic properties of MnFe2O4/ZnO nanocomposite and MnFe2O4 nanoparticles. The samples were prepared with a simple thermal decomposition method and then were characterized through thermogravimetry (TG) and differential thermal analysis (DTA), X-ray diffraction (XRD), field emission scanning electron microscope (FESEM) images, and vibrating sample magnetometry (VSM) at different temperatures. TG curves showed that pure samples can be obtained at 400 °C. XRD pattern of composite sample confirmed coexistence of crystalline cubic spinel Mn–ferrite and hexagonal zinc oxide phases. The estimated lattice parameter of MnFe2O4 nanoparticles, a = 8.39 A, was smaller than bulk value (a = 8.51 A) due to finite size effects. The magnetization of both samples followed the Bloch law with almost the same Bloch constant of β∼ 5 × 10 −5 (K −3/2) showing similar spin wave excitation mechanisms in the samples. However, the VSM measurements indicated that increase of coercivity (H c) of composite sample with decreasing the temperature is faster when compared with pure ferrite.
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