at carnegie mellon university's nanorobotics lab, they employ external magnetic fields to controllably position and orient a 200 x 100 x 50-micron permanent magnet micro-robot [ 1 ].
they demonstrate[d] this approach at the 2007 and 2008 [ event] robocup nanogram demonstrations.
moving on a glass slide in airpushing 50-micron polystyrene beads underwatermoving on a dime underwaterhigh-speed video of the side view, displaying stick-slip motion