The magnetorheological performance of nano magnetorheological (MR) fluids based on iron nickel oxide quasi spherical nanoparticles (NiFe 2 O 4 ) was investigated. The field induced viscoelastic and rheological behavior of nano MR fluids were explored with varying strain amplitude and shear rates. The fluids were subjected to steady state flow conditions and oscillatory strain sweep test under an applied magnetic field. It was observed that the shear stress was proportionally increasing with respect to the applied field. The lower values of loss modulus (G '' ) indicates the formation of long bundles of thin and thick lengthened nano and micro cluster chains of nickel ferrite particles showing an enhanced magnetorheological response. The maximum shear stress was achieved at an optimum value of particle concentration, within 0 -1.191 T magnetic flux density range. The study also reveals the increase in fluid sedimentation stability.

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