Transport of a SP bead by DWs

Dynamics of superparamagnetic microbead transport along magnetic nanotracks by magnetic domain walls.
Elizabeth Rapoport and Geoffrey S. D. Beach
Appl. Phys. Lett. 100, 082401 (2012)

Micromagnetically computed DW structure in a 400nm wide, 40 nm thick Permalloy track, with schematic of trapped bead and relevant forces during translation in a fluid. Magnetostatic potential energy versus lateral position is shown for a bead at the track surface with radius (b) 50 nm and (c) 1000 nm.