Figure 4.

$2\times 2 {\mathsf{\mu }\mathrm{m}}^2$ wide MFM phase maps of the CoPt multilayer sample, imaged with α-pillars of similar heights, fabricated at $20 \mathrm{keV}$, while $I_0$ was varied from $6.9-220 \mathrm{pA}$. For lowest currents, the MFM performance was very unstable, as shown by three representative images on the top left. The right SEM images show the respective Co₃Fe probes; the scale bar of 6.9 pA applies to all.