Fig. 5: Magnetic vortexes.
From: Collapse of the standard ferromagnetic domain structure in hybrid Co/Molecule bilayers
a–c Micromagnetic simulation of the spatial distribution of mz calculated at different representative points of a simulated hysteresis loop with an applied field tilted 5° out of plane (magnetization indicated in (d) by the circle, rhomb and triangle). Different vortexes configurations are predicted depending on the magnetization history. The MFM imaging of vortexes and their spatial distribution in the Co(5 nm)/C60(25 nm) sample at RT and under an applied field of 2 mT is shown in e, where several vortexes (identified by the black spots) with lateral dimension of about 50 nm. The black square is shown zoomed in f for a better visualization of a representative dark spot, along with its lateral profile. The images in e and f were taken at the magnetization indicated by red star in (d).
