The current-induced magnetic field of the functionalized [4]cumulene can thus locally approach the strength of the field strength used in nuclear magnetic resonance (NMR) spectroscopy in the ground-state structure, cf. Table 1. If we probe the theoretical limit by opening the bias window around the HOMO resonance, the current increases while the current density is qualitatively unchanged. Consequently, the magnetic field is enhanced by almost an order of magnitude. This substantial field, which locally reaches 4.5 T, underlines the importance current-induced magnetic fields can potentially have for the electric and magnetic properties of single-molecule junctions.