Figure 2. Comparison of 32 bit quasi-random patterns made using different current modes.

(a) Pattern written at a current of 0.61 nA. (b) Pattern written at a current of 4.86 nA. (c) The corresponding Fourier transform spectrum of (a). (d) The corresponding Fourier transform spectrum of (b). The unit cell is represented by the white rectangle. The scale bar is 1 µm.