To find a realistic distribution of the magnetic dipoles the elec-trode topography was studied by taking SEM micrographs. A typicalfragment of the electrode surface is presented in Fig. 2A. In theimage a 40 × 40 m area is marked. For this region an EDS mapof iron content was acquired, see Fig. 2B. The iron content mapwas divided into sectors using a 1 × 1 m grid. Sectors in whichiron covered more then half of the area were recognized as “mag-netic” and marked bright in Fig. 2C. During the simulations thepoint magnetic dipole moments corresponding to 1-m3volumeof magnetized, bound Fe@C NPs were placed in those positions.The magnetic dipole moment of the electrode material was cal-culated using the known magnetization curve [27] (45 A m2kg−1at 140-mT external field). Magnetization of 1-m3of the mate-rial resulted in a 4.5 × 10−16J T−1dipole moment. Agglomerateslarger then 1x1 m were treated as an appropriate assemble of 1-m3isolated units. Mutual interactions between the dipoles on theelectrode, which may lead to differences in the magnetization ofindividual parts of the magnetic material, were not included in themodel.