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The dynamics of fluid-borne superparamagnetic bead transport by field-driven domain walls in submicrometer ferromagnetic tracks is studied experimentally together with numerical and analytical modeling. Experiments show that nanotrack-guided domain walls can propel individual trapped beads through an aqueous medium at speeds approaching 1000 μm/s, 10 to 100 times faster than through any previously demonstrated mechanism.National Science Foundation (U.S.). Materials Research Science and Engineering Centers (Program) (Grant DMR-0819762)Deshpande Center for Technological InnovationMassachusetts Institute of Technology. Center for Materials Science and EngineeringMassachusetts Institute of Technology. Nonlinear Systems Laborator

Dynamics of superparamagnetic microbead transport along magnetic nanotracks by magnetic domain walls