Extended Data Fig. 4: Conditions for deterministic switching in Pt/Co/Pt.

(a) Magneto-optical images of the magnetization after illumination with σ laser pulses as a function of the number of pulses and fluence. Magneto-optical images were obtained using magneto-optical Faraday microscopy. Images were post-processed by removing the background. The images of the monodomain state, unaffected by laser pulses, are replaced by a uniform yellow background. The scale bar is 15 µm. (b) Diagram of the average magnetization after laser illumination inside the switched spot as a function of the number of pulses and fluence. Dots represent the MFM sampled images in deterministic (white) and mixed states (black) displayed in (c). The scale bars in (c) are 5 µm.