Movie S1.

Simulation of a rotating magnetite nanocrystal. This movie shows a model of a typical magnetite crystal with a truncated octahedral morphology as it follows the precessing magnetic field in the experimental setup. Note that, by setting the angle of the rotating magnetic field to 45° from vertical, no point on the crystal surface is stationary with respect to the surrounding space (which is liquid water in reality). Brownian motion is not shown.