FIGURE 1.

A, Wheel rotation and translation in 2 s with applied rotating magnetic field with axis of rotation $\stackrel{\mathbf{ˆ}}{\mathbf{\Omega }}=[0,\mathrm{c}\mathrm{o}\mathrm{s}(\pi /6),-1/2]$. 4.5 μm diameter beads, $f=40\mathrm{H}\mathrm{z}$, magnetic flux density B = 3.4 mT, scale bar = 50 μm. Note larger μwheels translate faster than smaller ones (Supplementary Video 1). B, Velocity and power dependence on assembled μwheel size with linear fits to expected behaviors. Inset: μWheel rotation rate $\omega$ scales as 1/R