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The manipulation of geometrically constrained magnetic domain walls (DWs) innanoscale magnetic strips has attracted much interest recently, with proposalsfor prospective memory and logic devices. Here we propose to use the highcontrollability of the motion of geometrically constrained DWs for themanipulation of individual nanoparticles on a chip with an active control ofposition at the nanometer scale. The proposed method exploits the fact thatmagnetic nanoparticles in solution can be captured by a DW, whose position canbe manipulated with nanometric accuracy in a specifically designed magneticnanowire structure. We show that the high control over DW nucleation,displacement, and annihilation processes in such structures can be used tocapture, transport and release magnetic nanoparticles. As magnetic particleswith functionalized surfaces are commonly used as molecule carriers or labels,the accurate control over the handling of the single magnetic nanoparticle iscrucial for several applications including single molecule manipulation,separation, cells manipulation and biomagnetic sensing.

On-chip manipulation of magnetic nanoparticles through domain walls conduits