On-chip manipulation of protein-coated magnetic beads via domain-wall conduits

Geometrically constrained magnetic domain walls (DWs) in magnetic nanowires can be manipulated at the nanometer scale. The inhomogeneous magnetic stray field generated by a DW can capture a magnetic nanoparticle in solution. On-chip nanomanipulation of individual magnetic beads coated with proteins is demonstrated through the motion of geometrically constrained DWs in specially designed magnetic nanoconduits fully integrated in a lab-on-a-chip platform. Figure Presented © 2010 WILEY-VCH Verlag GmbH & Co. KCaA, Weinheim.