In this work, the ferrimagnetic nickel-zinc ferrite nanopowder was synthesized via citrate-ethylene glycol processing, followed by the preparation of the epoxy-based nanocomposite. The materials were characterized using X-ray diffraction (XRD), simultaneous thermal analysis (STA), alternative gradient force magnetometer (AGFM), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The results showed that the sample calcined at 1000 C for 1 h had the best crystallinity, and the calculated crystallite size of this sample was $ 105 nm. The rheological properties and the magnetoviscous effect of the nanocomposites were studied by a standard rotating rheometer. The effects of the magnetic fields and shear rate with respect to time were investigated, and the results were discussed in terms of aggregates and magnetic field-induced structures.
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