Figure 5

(a) The sketch shows the layout of the system. (b) Explains images obtained by the non- standard advanced MFM operation mode where the magnetic field parallel to the NW axis is swept between two values while the magnetic signal is recorded along the central line over the NW. CoNi-Ni-CoNi segments are imaged by non-standard advanced MFM showing different behaviour under applied field. (c) and (d) represent two branches of the evolution of the magnetization of the Ni and CoNi segments. The profiles marked in (c) correspond to the configuration measured in the MFM images obtained at that magnetic fields presented in (e). (f) Vortex domain size decreases with the positive or negative increasing field magnitude. Data extracted from images (c) and (d).