Abstract
We report the directed transport of superparamagnetic microbeads (SPBs) on antidot arrays patterned from multilayered Co/Pt films with perpendicular magnetic anisotropy (PMA). The dynamics of water-suspended SPBs driven across the substrate surface by elliptical rotating magnetic fields is studied experimentally and modeled analytically. Bead motion on PMA substrates is shown to be significantly faster than on similarly patterned films based on in-plane magnetized materials. Furthermore, we show different SPB trajectories on different lattice geometries, suggesting that the magnetic potential distribution plays a crucial role in determining the dynamics. Our findings provide new insights into the enhanced transport of SPBs using PMA thin films as stray field sources that enable dynamic magnetic potential landscapes.
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