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• MnFe2O4/MoS2 nanocomposites were prepared by a sonochemical method. • MoS2 nanosheets were exfoliated and decorated homogeneously with MnFe2O4 nanoparticles. • Mesoporous structure with specific surface area of 97.16 m2/g. • Superparamagnetic behavior with saturation magnetization of 37.4 Am2/kg.<br>This study established a facile one-step strategy to anchor MnFe2O4 nanoparticles on the surface of MoS2 nanosheets in a controlled manner. The as-prepared MnFe2O4/MoS2 nanocomposites were investigated by TEM, XRD, XPS, Raman, BET and VSM in detail. The MnFe2O4 nanoparticles with an average particle size of 26 nm were densely and uniformly decorated on MoS2 nanosheets, and consequently, both the aggregation of MnFe2O4 nanoparticles and restacking of MoS2 nanosheets were effectively prevented. More importantly, the MnFe2O4/MoS2 nanocomposites exhibited high specific surface area, typical superparamagnetic behavior and excellent solution dispersion, showing a great potential for biomedical applications in the fields of magnetic resonance imaging, targeted drug delivery and tumor hyperthermia.