Figure 3: Remote magnetically guided writing.

(a) SEM images of two ridge lines generated from parallel (magnetically guidedmagnetically guided) motion of two individual nanowire motors. Diameter of nanowire motor, 400 nm. (b) Two crossed ridge lines produced from two individual staggered nanomotors under an external magnetic field. The second line resulted from the path of one nanomotor crossing over the path of another motor after turning the magnetic field. AFM images of parallel ridge lines (c) and of a right angle ridge pattern (d) generated from a longer exposure period. AFM images of a square-wave (e) and the letter ‘D’ (f) patterns obtained using moving nanomotors. Hydrogen peroxide concentration: 1%. Scale bars, a=5 μm, b=1 μm, c,d=10 μm, e,f=2 μm.