The fluid medium used for the experiments in this study is a 2-hour room temperature (Tamb = 25 o C) cross-linked PDMS (mixing ratio A:B = 10:1) polymer (δPDMS = 6.02%, zero-shear viscosity ηzs ~ 4.01 Pa.s, density = 1087 kg/m 3 ). The PDMS (Sylgard-184) kit was procured from Sigma-Aldrich, and its corresponding curing curve and rheology profile are given in Figure . The super paramagnetic nanoparticles used in this study are PVP-coated spherical Fe3O4 NPs (purity: 99%, average particle size: 20-30nm) procured from US Research Nanomaterials Inc., and its corresponding magnetization curve is shown in Figure . The NdFeB permanent bar magnets used in this study are of the N35 grade. The magnets were stacked to achieve the required magnetic field strength that was suitable for observing the phenomenon in the given setup, and the field contours in the experimental domain as measured using a portable magnetometer are as shown in